10 years agoperf trace: Add perf trace scripting support modules for Perl
Tom Zanussi [Wed, 25 Nov 2009 07:15:49 +0000]
perf trace: Add perf trace scripting support modules for Perl

Add Perf-Trace-Util Perl module and some scripts that use it.
Core.pm contains Perl code to define and access flag and
symbolic fields. Util.pm contains general-purpose utility
functions.

Also adds some makefile bits to install them in
libexec/perf-core/scripts/perl (or wherever perfexec_instdir
points).

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: fweisbec@gmail.com
Cc: rostedt@goodmis.org
Cc: anton@samba.org
Cc: hch@infradead.org
LKML-Reference: <1259133352-23685-5-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf trace: Add Perl scripting support
Tom Zanussi [Wed, 25 Nov 2009 07:15:48 +0000]
perf trace: Add Perl scripting support

Implement trace_scripting_ops to make Perl a supported perf
trace scripting language.

Additionally adds code that allows Perl trace scripts to access
the 'flag' and 'symbolic' (__print_flags(), __print_symbolic())
field information parsed from the trace format files.

Also adds the Perl implementation of the generate_script()
trace_scripting_op, which creates a ready-to-run perf trace Perl
script based on existing trace data.  Scripts generated by this
implementation print out all the fields for each event mentioned
in perf.data (and will detect and generate the proper scripting
code for 'flag' and 'symbolic' fields), and will additionally
generate handlers for the special 'trace_unhandled',
'trace_begin' and 'trace_end' handlers.  Script authors can
simply remove the printing code to implement their own custom
event handling.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: fweisbec@gmail.com
Cc: rostedt@goodmis.org
Cc: anton@samba.org
Cc: hch@infradead.org
LKML-Reference: <1259133352-23685-4-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf trace: Add flag/symbolic format_flags
Tom Zanussi [Wed, 25 Nov 2009 07:15:47 +0000]
perf trace: Add flag/symbolic format_flags

It's useful to know whether a field is a flag or symbolic field
for e.g. when generating scripts - it allows us to translate
those fields specially rather than literally as plain numeric
values.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: fweisbec@gmail.com
Cc: rostedt@goodmis.org
Cc: anton@samba.org
Cc: hch@infradead.org
LKML-Reference: <1259133352-23685-3-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf trace: Add scripting ops
Tom Zanussi [Wed, 25 Nov 2009 07:15:46 +0000]
perf trace: Add scripting ops

Adds an interface, scripting_ops, that when implemented for a
particular scripting language enables built-in support for trace
stream processing using that language.

The interface is designed to enable full-fledged language
interpreters to be embedded inside the perf executable and
thereby make the full capabilities of the supported languages
available for trace processing.

See below for details on the interface.

This patch also adds a couple command-line options to 'perf
trace':

The -s option option is used to specify the script to be run.
Script names that can be used with -s take the form:

[language spec:]scriptname[.ext]

Scripting languages register a set of 'language specs' that can
be used to specify scripts for the registered languages.  The
specs can be used either as prefixes or extensions.

If [language spec:] is used, the script is taken as a script of
the matching language regardless of any extension it might have.
 If [language spec:] is not used, [.ext] is used to look up the
language it corresponds to.  Language specs are case
insensitive.

e.g. Perl scripts can be specified in the following ways:

Perl:scriptname
pl:scriptname.py # extension ignored
PL:scriptname
scriptname.pl
scriptname.perl

The -g [language spec] option gives users an easy starting point
for writing scripts in the specified language.  Scripting
support for a particular language can implement a
generate_script() scripting op that outputs an empty (or
near-empty) set of handlers for all the events contained in a
given perf.data trace file - this option gives users a direct
way to access that.

Adding support for a scripting language
---------------------------------------

The main thing that needs to be done do add support for a new
language is to implement the scripting_ops interface:

It consists of the following four functions:

    start_script()
    stop_script()
    process_event()
    generate_script()

start_script() is called before any events are processed, and is
meant to give the scripting language support an opportunity to
set things up to receive events e.g. create and initialize an
instance of a language interpreter.

stop_script() is called after all events are processed, and is
meant to give the scripting language support an opportunity to
clean up e.g. destroy the interpreter instance, etc.

process_event() is called once for each event and takes as its
main parameter a pointer to the binary trace event record to be
processed. The implementation is responsible for picking out the
binary fields from the event record and sending them to the
script handler function associated with that event e.g. a
function derived from the event name it's meant to handle e.g.
'sched::sched_switch()'.  The 'format' information for trace
events can be used to parse the binary data and map it into a
form usable by a given scripting language; see the Perl
implemention in subsequent patches for one possible way to
leverage the existing trace format parsing code in perf and map
that info into specific scripting language types.

generate_script() should generate a ready-to-run script for the
current set of events in the trace, preferably with bodies that
print out every field for each event.  Again, look at the Perl
implementation for clues as to how that can be done.  This is an
optional, but very useful op.

Support for a given language should also add a language-specific
setup function and call it from setup_scripting().  The
language-specific setup function associates the the scripting
ops for that language with one or more 'language specifiers'
(see below) using script_spec_register().  When a script name is
specified on the command line, the scripting ops associated with
the specified language are used to instantiate and use the
appropriate interpreter to process the trace stream.

In general, it should be relatively easy to add support for a
new language, especially if the language implementation supports
an interface allowing an interpreter to be 'embedded' inside
another program (in this case the containing program will be
'perf trace'). If so, it should be relatively straightforward to
translate trace events into invocations of user-defined script
functions where e.g. the function name corresponds to the event
type and the function parameters correspond to the event fields.
 The event and field type information exported by the event
tracing infrastructure (via the event 'format' files) should be
enough to parse and send any piece of trace data to the user
script.  The easiest way to see how this can be done would be to
look at the Perl implementation contained in
perf/util/trace-event-perl.c/.h.

There are a couple of other things that aren't covered by the
scripting_ops or setup interface and are technically optional,
but should be implemented if possible.  One of these is support
for 'flag' and 'symbolic' fields e.g. being able to use more
human-readable values such as 'GFP_KERNEL' or
HI/BLOCK_IOPOLL/TASKLET in place of raw flag values.  See the
Perl implementation to see how this can be done. The other thing
is support for 'calling back' into the perf executable to access
e.g. uncommon fields not passed by default into handler
functions, or any metadata the implementation might want to make
available to users via the language interface.  Again, see the
Perl implementation for examples.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: fweisbec@gmail.com
Cc: rostedt@goodmis.org
Cc: anton@samba.org
Cc: hch@infradead.org
LKML-Reference: <1259133352-23685-2-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf tools: Consolidate symbol resolving across all tools
Arnaldo Carvalho de Melo [Fri, 27 Nov 2009 18:29:23 +0000]
perf tools: Consolidate symbol resolving across all tools

Now we have a very high level routine for simple tools to
process IP sample events:

int event__preprocess_sample(const event_t *self,
     struct addr_location *al,
     symbol_filter_t filter)

It receives the event itself and will insert new threads in the
global threads list and resolve the map and symbol, filling all
this info into the new addr_location struct, so that tools like
annotate and report can further process the event by creating
hist_entries in their specific way (with or without callgraphs,
etc).

It in turn uses the new next layer function:

void thread__find_addr_location(struct thread *self, u8 cpumode,
enum map_type type, u64 addr,
struct addr_location *al,
symbol_filter_t filter)

This one will, given a thread (userspace or the kernel kthread
one), will find the given type (MAP__FUNCTION now, MAP__VARIABLE
too in the near future) at the given cpumode, taking vdsos into
account (userspace hit, but kernel symbol) and will fill all
these details in the addr_location given.

Tools that need a more compact API for plain function
resolution, like 'kmem', can use this other one:

struct symbol *thread__find_function(struct thread *self, u64 addr,
     symbol_filter_t filter)

So, to resolve a kernel symbol, that is all the 'kmem' tool
needs, its just a matter of calling:

sym = thread__find_function(kthread, addr, NULL);

The 'filter' parameter is needed because we do lazy
parsing/loading of ELF symtabs or /proc/kallsyms.

With this we remove more code duplication all around, which is
always good, huh? :-)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259346563-12568-12-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf tools: Reorganize event processing routines, lotsa dups killed
Arnaldo Carvalho de Melo [Fri, 27 Nov 2009 18:29:22 +0000]
perf tools: Reorganize event processing routines, lotsa dups killed

While implementing event__preprocess_sample, that will do all of
the symbol lookup in one convenient function, I noticed that
util/process_event.[ch] were not being used at all, then started
looking if there were other functions that could be shared
and...

All those functions really don't need to receive offset + head,
the only thing they did was common to all of them, so do it at
one place instead.

Stats about number of each type of event processed now is done
in a central place.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: John Kacur <jkacur@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259346563-12568-11-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf symbols: When not using modules, discard its symbols
Arnaldo Carvalho de Melo [Fri, 27 Nov 2009 18:29:21 +0000]
perf symbols: When not using modules, discard its symbols

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259346563-12568-10-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf symbols: Support multiple symtabs in struct thread
Arnaldo Carvalho de Melo [Fri, 27 Nov 2009 18:29:20 +0000]
perf symbols: Support multiple symtabs in struct thread

Making the routines that were so far specific to the kernel maps
useful for all threads.

This is done by making the kernel maps be contained in a kernel
"thread".

This gets the kernel specific routines closer to the userspace
counterparts, which will help in reducing the boilerplate for
resolving a symbol, as will be demonstrated in the next patches.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259346563-12568-9-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf symbols: Kernel_maps should be an array of MAP__NR_TYPES entries
Arnaldo Carvalho de Melo [Fri, 27 Nov 2009 18:29:19 +0000]
perf symbols: Kernel_maps should be an array of MAP__NR_TYPES entries

So that we can support multiple symbol table types.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259346563-12568-8-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf symbols: Make the kallsyms loading routines part of the dso class
Arnaldo Carvalho de Melo [Fri, 27 Nov 2009 18:29:18 +0000]
perf symbols: Make the kallsyms loading routines part of the dso class

So that the kallsyms loading routines are the direct counterpart
of the vmlinux loading ones, i.e. dso__load_kallsyms is the
counterpart of dso__load_vmlinux.

In the process make them also use the symbols rb tree indexed by
map->type, paving the way for supporting other types of symtabs,
such as the next one to be supported: variables.

This also allowed removal of yet another global variable:
kernel_map__functions.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259346563-12568-7-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf symbols: Better support for multiple symbol tables per dso
Arnaldo Carvalho de Melo [Fri, 27 Nov 2009 18:29:17 +0000]
perf symbols: Better support for multiple symbol tables per dso

By using an array of rb_roots in struct dso we can, from a
struct map instance to get the right symbol rb_tree more easily.
This way we can have just one symbol lookup method for struct
map instances, map__find_symbol, instead of one per symtab type
(functions, variables).

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259346563-12568-6-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf symbols: Add a 'type' field to struct map
Arnaldo Carvalho de Melo [Fri, 27 Nov 2009 18:29:16 +0000]
perf symbols: Add a 'type' field to struct map

That way we will be able to check if the right symtab is loaded
in the underlying DSO.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259346563-12568-5-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf symbols: Unexport kernel_map__functions
Arnaldo Carvalho de Melo [Fri, 27 Nov 2009 18:29:15 +0000]
perf symbols: Unexport kernel_map__functions

perf annotate was the only user, and it doesn't really need it.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259346563-12568-4-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf symbols: Split the dsos list into kernel and user parts
Arnaldo Carvalho de Melo [Fri, 27 Nov 2009 18:29:14 +0000]
perf symbols: Split the dsos list into kernel and user parts

We don't need to look at modules in dsos__findnew because the
kernel events come only with user DSOs. Also we need a way to
list just the module DSOs so that we can create multiple sets of
maps, now that we will support maps for the variables in a
symtab.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259346563-12568-3-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf symbols: Rename kernel_mapto kernel_map[s]__functions
Arnaldo Carvalho de Melo [Fri, 27 Nov 2009 18:29:13 +0000]
perf symbols: Rename kernel_mapto kernel_map[s]__functions

As we'll have kernel_map[s]__variables too.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259346563-12568-2-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf symbols: Avoid annoying message about loading symbols
Arnaldo Carvalho de Melo [Fri, 27 Nov 2009 18:29:12 +0000]
perf symbols: Avoid annoying message about loading symbols

This should be properly fixed when we remove the XXX comment in
'perf report', function resolve_symbol.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259346563-12568-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotrace_kprobes: Don't output zero offset
Lai Jiangshan [Wed, 25 Nov 2009 08:33:15 +0000]
trace_kprobes: Don't output zero offset

"symbol_name+0" is not so friendly.
It makes the output longer.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B0CEBCB.7080309@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotrace_kprobes: Always show group name
Lai Jiangshan [Wed, 25 Nov 2009 08:32:47 +0000]
trace_kprobes: Always show group name

Sometimes the group name is not "kprobes",
It'll be better if we can read it from tracing/kprobe_events.

 # echo 'r:laijs/vfs_read vfs_read %ax' > kprobe_events
 # cat kprobe_events
 r:laijs/vfs_read vfs_read %ax=%ax

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B0CEBAF.6000104@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotrace_kprobes: Fix memory leak
Lai Jiangshan [Wed, 25 Nov 2009 08:32:21 +0000]
trace_kprobes: Fix memory leak

tp->nr_args is not set before we "goto error",
it causes memory leak for free_trace_probe() use tp->nr_args
to free memory of args.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B0CEB95.2060107@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotrace_syscalls: Add syscall nr field
Lai Jiangshan [Thu, 26 Nov 2009 07:49:33 +0000]
trace_syscalls: Add syscall nr field

Field syscall number is missed in syscall_enter_define_fields()/
syscall_exit_define_fields().

Syscall number is also needed for event filter or other users.

Signed-off-by: Lai Jiangshan <laijs@cn.fujitsu.com>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <4B0E330D.1070206@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agohw-breakpoints: Use struct perf_event_attr to define kernel breakpoints
Frederic Weisbecker [Fri, 27 Nov 2009 03:55:54 +0000]
hw-breakpoints: Use struct perf_event_attr to define kernel breakpoints

Kernel breakpoints are created using functions in which we pass
breakpoint parameters as individual variables: address, length
and type.

Although it fits well for x86, this just does not scale across
architectures that may support this api later as these may have
more or different needs. Pass in a perf_event_attr structure
instead because it is meant to evolve as much as possible into
a generic hardware breakpoint parameter structure.

Reported-by: K.Prasad <prasad@linux.vnet.ibm.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1259294154-5197-2-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agohw-breakpoints: Use struct perf_event_attr to define user breakpoints
Frederic Weisbecker [Fri, 27 Nov 2009 03:55:53 +0000]
hw-breakpoints: Use struct perf_event_attr to define user breakpoints

In-kernel user breakpoints are created using functions in which
we pass breakpoint parameters as individual variables: address,
length and type.

Although it fits well for x86, this just does not scale across
archictectures that may support this api later as these may have
more or different needs. Pass in a perf_event_attr structure
instead because it is meant to evolve as much as possible into
a generic hardware breakpoint parameter structure.

Reported-by: K.Prasad <prasad@linux.vnet.ibm.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1259294154-5197-1-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf_events: Fix read() bogus counts when in error state
Stephane Eranian [Thu, 26 Nov 2009 17:24:30 +0000]
perf_events: Fix read() bogus counts when in error state

When a pinned group cannot be scheduled it goes into error state.

Normally a group cannot go out of error state without being
explicitly re-enabled or disabled. There was a bug in per-thread
mode, whereby upon termination of the thread, the group would
transition from error to off leading to bogus counts and timing
information returned by read().

Fix it by clearing the error state.

Signed-off-by: Stephane Eranian <eranian@google.com>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: perfmon2-devel@lists.sourceforge.net
LKML-Reference: <4b0eb9ce.0508d00a.573b.ffffeab6@mx.google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotracing: Fix kmem event exports
Ingo Molnar [Thu, 26 Nov 2009 12:11:46 +0000]
tracing: Fix kmem event exports

Commit 53d0422 ("tracing: Convert some kmem events to DEFINE_EVENT")
moved the kmem tracepoint creation from util.c to page_alloc.c,
but forgot to move the exports.

Move them back.

Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mel Gorman <mel@csn.ul.ie>
LKML-Reference: <4B0E286A.2000405@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotracepoint: Add signal loss events
Masami Hiramatsu [Tue, 24 Nov 2009 21:56:58 +0000]
tracepoint: Add signal loss events

Add signal_overflow_fail and signal_lose_info tracepoints
for signal-lost events.

Changes in v3:
 - Add docbook style comments

Changes in v2:
 - Use siginfo string macro

Suggested-by: Roland McGrath <roland@redhat.com>
Reviewed-by: Jason Baron <jbaron@redhat.com>
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Acked-by: Roland McGrath <roland@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Oleg Nesterov <oleg@redhat.com>
LKML-Reference: <20091124215658.30449.9934.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotracepoint: Add signal deliver event
Masami Hiramatsu [Tue, 24 Nov 2009 21:56:51 +0000]
tracepoint: Add signal deliver event

Add a tracepoint where a process gets a signal. This tracepoint
shows signal-number, sa-handler and sa-flag.

Changes in v3:
 - Add docbook style comments

Changes in v2:
 - Add siginfo argument
 - Fix comment

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Reviewed-by: Jason Baron <jbaron@redhat.com>
Acked-by: Roland McGrath <roland@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Oleg Nesterov <oleg@redhat.com>
LKML-Reference: <20091124215651.30449.20926.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotracepoint: Move signal sending tracepoint to events/signal.h
Masami Hiramatsu [Tue, 24 Nov 2009 21:56:45 +0000]
tracepoint: Move signal sending tracepoint to events/signal.h

Move signal sending event to events/signal.h. This patch also
renames sched_signal_send event to signal_generate.

Changes in v4:
 - Fix a typo of task_struct pointer.

Changes in v3:
 - Add docbook style comments

Changes in v2:
 - Add siginfo argument
 - Add siginfo storing macro

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Reviewed-by: Jason Baron <jbaron@redhat.com>
Acked-by: Roland McGrath <roland@redhat.com>
Cc: systemtap <systemtap@sources.redhat.com>
Cc: DLE <dle-develop@lists.sourceforge.net>
Cc: Oleg Nesterov <oleg@redhat.com>
LKML-Reference: <20091124215645.30449.60208.stgit@dhcp-100-2-132.bos.redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agohw-breakpoints: Fix unused function in off-case
Frederic Weisbecker [Wed, 25 Nov 2009 20:20:53 +0000]
hw-breakpoints: Fix unused function in off-case

bp_perf_event_destroy() is unused in its off-case version, let's
remove it to fix the following warning reported by Stephen
Rothwell in linux-next:

  kernel/perf_event.c:4306: warning: 'bp_perf_event_destroy' defined but not used

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <1259180453-5813-1-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agokernel/hw_breakpoint.c: Fix local/global shadowing
Andrew Morton [Thu, 26 Nov 2009 07:01:50 +0000]
kernel/hw_breakpoint.c: Fix local/global shadowing

If the new percpu tree is combined with the perf events tree
the following new warning triggers:

 kernel/hw_breakpoint.c: In function 'toggle_bp_task_slot':
 kernel/hw_breakpoint.c:151: warning: 'task_bp_pinned' is used uninitialized in this function

Because it's not valid anymore to define a local variable
and a percpu variable (even if it's file scope local) with
the same name.

Rename the local variable to resolve this.

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Tejun Heo <tj@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <200911260701.nAQ71owx016356@imap1.linux-foundation.org>
[ v2: added changelog ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agox86/hw-breakpoints: Don't lose GE flag while disabling a breakpoint
Frederic Weisbecker [Thu, 26 Nov 2009 05:04:38 +0000]
x86/hw-breakpoints: Don't lose GE flag while disabling a breakpoint

When we schedule out a breakpoint from the cpu, we also
incidentally remove the "Global exact breakpoint" flag from the
breakpoint control register. It makes us losing the fine grained
precision about the origin of the instructions that may trigger
breakpoint exceptions for the other breakpoints running in this
cpu.

Reported-by: Prasad <prasad@linux.vnet.ibm.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1259211878-6013-1-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agohw-breakpoints: Simplify error handling in breakpoint creation requests
Frederic Weisbecker [Thu, 26 Nov 2009 04:35:42 +0000]
hw-breakpoints: Simplify error handling in breakpoint creation requests

This simplifies the error handling when we create a breakpoint.
We don't need to check the NULL return value corner case anymore
since we have improved perf_event_create_kernel_counter() to
always return an error code in the failure case.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Prasad <prasad@linux.vnet.ibm.com>
LKML-Reference: <1259210142-5714-3-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agohw-breakpoints: Improve in-kernel event creation error granularity
Frederic Weisbecker [Thu, 26 Nov 2009 04:35:41 +0000]
hw-breakpoints: Improve in-kernel event creation error granularity

In fail case, perf_event_create_kernel_counter() returns NULL
instead of an error, which doesn't help us to inform the user
about the origin of the problem from the outer most callers.
Often we can just return -EINVAL, which doesn't help anyone when
it's eventually about a memory allocation failure.

Then, this patch makes perf_event_create_kernel_counter() always
return a detailed error code.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Prasad <prasad@linux.vnet.ibm.com>
LKML-Reference: <1259210142-5714-2-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoksym_tracer: Fix breakpoint removal after modification
Frederic Weisbecker [Thu, 26 Nov 2009 04:35:40 +0000]
ksym_tracer: Fix breakpoint removal after modification

The error path of a breakpoint modification is broken in
the ksym tracer. A modified breakpoint hlist node is immediately
released after its removal. Also we leak a breakpoint in this
case.

Fix the path.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Prasad <prasad@linux.vnet.ibm.com>
LKML-Reference: <1259210142-5714-1-git-send-regression-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotracing: Restore original format of sched events
Li Zefan [Thu, 26 Nov 2009 07:08:01 +0000]
tracing: Restore original format of sched events

The original format for sched_stat_iowait and sched_stat_sleep:

  $ cat events/sched/sched_stat_iowait/format
  ...
  print fmt: "comm=%s pid=%d delay=%Lu [ns]", ...
  $ cat events/sched/sched_stat_sleep/format
  ...
  print fmt: "comm=%s pid=%d delay=%Lu [ns]", ...

But commit commit 75ec29ab848a7e92a41aaafaeb33d1afbc839be4
("tracing: Convert some sched trace events to DEFINE_EVENT and
_PRINT") broke the format:

  $ cat events/sched/sched_stat_iowait/format
  print fmt: "task: %s:%d iowait: %Lu [ns]", ...
  $ cat events/sched/sched_stat_sleep/format
  print fmt: "task: %s:%d sleep: %Lu [ns]", ...

No change in functionality.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B0E2951.9050800@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotracing: Convert some ext4 events to DEFINE_TRACE
Li Zefan [Thu, 26 Nov 2009 07:07:36 +0000]
tracing: Convert some ext4 events to DEFINE_TRACE

Use DECLARE_EVENT_CLASS to remove duplicate code:

   text    data     bss     dec     hex filename
 294695    6104     340  301139   49853 fs/ext4/ext4.o.old
 289983    6104     324  296411   485db fs/ext4/ext4.o

5 events are convertd:

  ext4__write_begin: ext4_write_begin, ext4_da_write_begin
  ext4__write_end: ext4_{ordered, writeback, journalled}_write_end

No change in functionality.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B0E2938.2040708@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotracing: Convert some jbd2 events to DEFINE_EVENT
Li Zefan [Thu, 26 Nov 2009 07:06:55 +0000]
tracing: Convert some jbd2 events to DEFINE_EVENT

Use DECLARE_EVENT_CLASS to remove duplicate code:

   text    data     bss     dec     hex filename
  34903    1693     448   37044    90b4 fs/jbd2/journal.o.old
  31931    1693     416   34040    84f8 fs/jbd2/journal.o

Four events are converted:

  jbd2_commit: jbd2_start_commit,
               jbd2_commit_{locking, flushing, logging}

No change in functionality.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B0E290F.7030909@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotracing: Convert some block events to DEFINE_EVENT
Li Zefan [Thu, 26 Nov 2009 07:06:14 +0000]
tracing: Convert some block events to DEFINE_EVENT

use DECLARE_EVENT_CLASS to remove duplicate code:

   text    data     bss     dec     hex filename
  53570    3284     184   57038    dece block/blk-core.o.old
  43702    3284     144   47130    b81a block/blk-core.o

12 events are converted:

  block_rq: block_rq_insert, block_rq_issue
  block_rq_with_error: block_rq_{abort, requeue, complete}
  block_bio: block_bio_{backmerge, frontmerge, queue}
  block_get_rq: block_getrq, block_sleeprq
  block_unplug: block_unplug_timer, block_unplug_io

No change in functionality.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Jens Axboe <jens.axboe@oracle.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B0E28E6.7060609@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotracing: Convert some power events to DEFINE_EVENT
Li Zefan [Thu, 26 Nov 2009 07:05:38 +0000]
tracing: Convert some power events to DEFINE_EVENT

Use DECLARE_EVENT_CLASS to remove duplicate code:

   text    data     bss     dec     hex filename
   4312     524      12    4848    12f0 kernel/trace/power-traces.o.old
   3455     524       8    3987     f93 kernel/trace/power-traces.o

Two events are converted:

  power: power_start, power_frequency

No change in functionality.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arjan van de Ven <arjan@infradead.org>
LKML-Reference: <4B0E28C2.1090906@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotracing: Convert some workqueue events to DEFINE_EVENT
Li Zefan [Thu, 26 Nov 2009 07:05:03 +0000]
tracing: Convert some workqueue events to DEFINE_EVENT

Use DECLARE_EVENT_CLASS to remove duplicate code:

   text    data     bss     dec     hex filename
  13171     800      72   14043    36db kernel/workqueue.o.old
  12243     800      68   13111    3337 kernel/workqueue.o

Two events are converted:

  workqueue: workqueue_insertion, workqueue_execution

No change in functionality.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B0E289F.5010104@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotracing: Convert softirq events to DEFINE_EVENT
Li Zefan [Thu, 26 Nov 2009 07:04:31 +0000]
tracing: Convert softirq events to DEFINE_EVENT

Use DECLARE_EVENT_CLASS to remove duplicate code:

   text    data     bss     dec     hex filename
  12781     952      36   13769    35c9 kernel/softirq.o.old
  11981     952      32   12965    32a5 kernel/softirq.o

Two events are converted:

  softirq: softirq_entry, softirq_exit

No change in functionality.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B0E287F.4030708@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotracing: Convert some kmem events to DEFINE_EVENT
Li Zefan [Thu, 26 Nov 2009 07:04:10 +0000]
tracing: Convert some kmem events to DEFINE_EVENT

Use DECLARE_EVENT_CLASS to remove duplicate code:

   text    data     bss     dec     hex filename
 333987   69800   27228  431015   693a7 mm/built-in.o.old
 330030   69800   27228  427058   68432 mm/built-in.o

8 events are converted:

  kmem_alloc: kmalloc, kmem_cache_alloc
  kmem_alloc_node: kmalloc_node, kmem_cache_alloc_node
  kmem_free: kfree, kmem_cache_free
  mm_page: mm_page_alloc_zone_locked, mm_page_pcpu_drain

No change in functionality.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mel Gorman <mel@csn.ul.ie>
LKML-Reference: <4B0E286A.2000405@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotracing: Convert module refcnt events to DEFINE_EVENT
Li Zefan [Thu, 26 Nov 2009 07:03:23 +0000]
tracing: Convert module refcnt events to DEFINE_EVENT

Use DECLARE_EVENT_CLASS to remove duplicate code:

   text    data     bss     dec     hex filename
  29854    1980     128   31962    7cda kernel/module.o.old
  28750    1980     128   30858    788a kernel/module.o

Two events are converted:

  module_refcnt: module_get, module_put

No change in functionality.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B0E283B.3010508@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoevents: Rename TRACE_EVENT_TEMPLATE() to DECLARE_EVENT_CLASS()
Ingo Molnar [Thu, 26 Nov 2009 08:04:55 +0000]
events: Rename TRACE_EVENT_TEMPLATE() to DECLARE_EVENT_CLASS()

It is not quite obvious at first sight what TRACE_EVENT_TEMPLATE
does: does it define an event as well beyond defining a template?

To clarify this, rename it to DECLARE_EVENT_CLASS, which follows
the various 'DECLARE_*()' idioms we already have in the kernel:

  DECLARE_EVENT_CLASS(class)

    DEFINE_EVENT(class, event1)
    DEFINE_EVENT(class, event2)
    DEFINE_EVENT(class, event3)

To complete this logic we should also rename TRACE_EVENT() to:

  DEFINE_SINGLE_EVENT(single_event)

... but in a more quiet moment of the kernel cycle.

Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <4B0E286A.2000405@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agox86: Rename global percpu symbol dr7 to cpu_dr7
Tejun Heo [Wed, 25 Nov 2009 13:24:44 +0000]
x86: Rename global percpu symbol dr7 to cpu_dr7

Percpu symbols now occupy the same namespace as other global
symbols and as such short global symbols without subsystem
prefix tend to collide with local variables.  dr7 percpu
variable used by x86 was hit by this. Rename it to cpu_dr7.

The rename also makes it more consistent with its fellow
cpu_debugreg percpu variable.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <20091125115856.GA17856@elte.hu>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>

10 years agotrace/syscalls: Change ret param in struct syscall_trace_exit to long
Tom Zanussi [Wed, 25 Nov 2009 07:14:59 +0000]
trace/syscalls: Change ret param in struct syscall_trace_exit to long

Commit ee949a86b3aef15845ea677aa60231008de62672 ("tracing/syscalls:
Use long for syscall ret format and field definitions") changed the
syscall exit return type to long, but forgot to change it in the
struct.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1259133299-23594-3-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf tools: Add 'signed' flag setting back into trace-event-parse.c
Tom Zanussi [Wed, 25 Nov 2009 07:14:58 +0000]
perf tools: Add 'signed' flag setting back into trace-event-parse.c

Commit 13999e59343b042b0807be2df6ae5895d29782a0 (perf tools:
Handle the case with and without the "signed" trace field)
removed code to set the FIELD_IS_SIGNED flag that was originally
added by commit 26a50744b21fff65bd754874072857bee8967f4d
(tracing/events: Add 'signed' field to format files).

This adds it back.

Signed-off-by: Tom Zanussi <tzanussi@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1259133299-23594-2-git-send-email-tzanussi@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoMerge branch 'tip/perf/core' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt...
Ingo Molnar [Wed, 25 Nov 2009 08:03:15 +0000]
Merge branch 'tip/perf/core' of git://git./linux/kernel/git/rostedt/linux-2.6-trace into perf/core

10 years agotracing: Convert some sched trace events to DEFINE_EVENT and _PRINT
Steven Rostedt [Thu, 19 Nov 2009 01:48:08 +0000]
tracing: Convert some sched trace events to DEFINE_EVENT and _PRINT

Converting some of the scheduler trace events to use the
TRACE_EVENT_TEMPLATE, DEFINE_EVENT and DEFINE_EVENT_PRINT helped to
save some space:

$ size kernel/sched.o-*
   text    data     bss     dec     hex filename
  79299    6776    2520   88595   15a13 kernel/sched.o-notrace
 101941   11896    2584  116421   1c6c5 kernel/sched.o-templ
 104779   11896    2584  119259   1d1db kernel/sched.o-trace

sched.o-notrace is without any tracepoints compiled
sched.o-templ is with this patch
sched.o-trace is the tracepoints before this patch

The trace events converted to DEFINE_EVENT:

sched_wakeup, sched_wakeup_new, sched_process_free, sched_process_exit,
and sched_stat_wait.

The trace events converted to DEFINE_EVENT_PRINT:

sched_stat_sleep and sched_stat_iowait.

Note, since the TRACE_EVENT_TEMPLATE always uses a print, the
sched_stat_wait print format is defined in the template and this
template is used by sched_stat_sleep and sched_stat_iowait. But the
later two override the print format.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

10 years agotracing: Create new DEFINE_EVENT_PRINT
Steven Rostedt [Thu, 19 Nov 2009 01:36:26 +0000]
tracing: Create new DEFINE_EVENT_PRINT

After creating the TRACE_EVENT_TEMPLATE I started to look at other
trace points to see what duplication was made. I noticed that there
are several trace points where they are almost identical except for
the name and the output format. Since TRACE_EVENT_TEMPLATE was successful
in bringing down the size of trace events, I added a DEFINE_EVENT_PRINT.

DEFINE_EVENT_PRINT is used just like DEFINE_EVENT is. That is, the
DEFINE_EVENT_PRINT also uses a TRACE_EVENT_TEMPLATE, but it allows the
developer to overwrite the print format. If there are two or more
TRACE_EVENTS that are identical except for the name and print, then
they can be converted to use a TRACE_EVENT_TEMPLATE. Since the
TRACE_EVENT_TEMPLATE already does the print output, the first trace event
would have its print format held in the TRACE_EVENT_TEMPLATE and
be defined with a DEFINE_EVENT. The rest will use the DEFINE_EVENT_PRINT
and override the print format.

Converting the sched trace points to both DEFINE_EVENT and
DEFINE_EVENT_PRINT. Five were converted to DEFINE_EVENT and two were
converted to DEFINE_EVENT_PRINT.

I was able to get the following:

$ size kernel/sched.o-*
   text    data     bss     dec     hex filename
  79299    6776    2520   88595   15a13 kernel/sched.o-notrace
 101941   11896    2584  116421   1c6c5 kernel/sched.o-templ
 104779   11896    2584  119259   1d1db kernel/sched.o-trace

sched.o-notrace is the scheduler compiled with no trace points.
sched.o-templ is with the use of DEFINE_EVENT and DEFINE_EVENT_PRINT
sched.o-trace is the current trace events.

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

10 years agotracing: Create new TRACE_EVENT_TEMPLATE
Steven Rostedt [Thu, 19 Nov 2009 01:27:27 +0000]
tracing: Create new TRACE_EVENT_TEMPLATE

There are some places in the kernel that define several tracepoints and
they are all identical besides the name. The code to enable, disable and
record is created for every trace point even if most of the code is
identical.

This patch adds TRACE_EVENT_TEMPLATE that lets the developer create
a template TRACE_EVENT and create trace points with DEFINE_EVENT, which
is based off of a given template. Each trace point used by this
will share most of the code, and bring down the size of the kernel
when there are several duplicate events.

Usage is:

TRACE_EVENT_TEMPLATE(name, proto, args, tstruct, assign, print);

Which would be the same as defining a normal TRACE_EVENT.

To create the trace events that the trace points will use:

DEFINE_EVENT(template, name, proto, args) is done. The template
is the name of the TRACE_EVENT_TEMPLATE to use. The name is the
name of the trace point. The parameters proto and args must be the same
as the proto and args of the template. If they are not the same,
then a compile error will result. I tried hard removing this duplication
but the C preprocessor is not powerful enough (or my CPP magic
experience points is not at a high enough level) to not need them.

A lot of trace events are coming in with new XFS development. Most of
the trace points are identical except for the name. The following shows
the advantage of having TRACE_EVENT_TEMPLATE:

$ size fs/xfs/xfs.o.*
    text          data     bss     dec     hex filename
  452114          2788    3520  458422   6feb6 fs/xfs/xfs.o.old
  638482         38116    3744  680342   a6196 fs/xfs/xfs.o.template
  996954         38116    4480 1039550   fdcbe fs/xfs/xfs.o.trace

xfs.o.old is without any tracepoints.
xfs.o.template uses the new TRACE_EVENT_TEMPLATE.
xfs.o.trace uses the current TRACE_EVENT macros.

Requested-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

10 years agoperf_events: Fix bad software/trace event recursion counting
Frederic Weisbecker [Tue, 24 Nov 2009 19:38:22 +0000]
perf_events: Fix bad software/trace event recursion counting

Commit 4ed7c92d68a5387ba5f7030dc76eab03558e27f5
(perf_events: Undo some recursion damage) has introduced a bad
reference counting of the recursion context. putting the context
behaves like getting it, dropping every software/trace events
after the first one in a context.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arjan van de Ven <arjan@infradead.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <1259091502-5171-1-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf_events, x86: Fix validate_event bug
Stephane Eranian [Tue, 24 Nov 2009 13:27:18 +0000]
perf_events, x86: Fix validate_event bug

The validate_event() was failing on valid event combinations. The
function was assuming that if x86_schedule_event() returned 0, it
meant error. But x86_schedule_event() returns the counter index and
0 is a perfectly valid value. An error is returned if the function
returns a negative value.

Furthermore, validate_event() was also failing for event groups
because the event->pmu was not set until after
hw_perf_event_init().

Signed-off-by: Stephane Eranian <eranian@google.com>
Cc: peterz@infradead.org
Cc: paulus@samba.org
Cc: perfmon2-devel@lists.sourceforge.net
Cc: eranian@gmail.com
LKML-Reference: <4b0bdf36.1818d00a.07cc.25ae@mx.google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
--
 arch/x86/kernel/cpu/perf_event.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

10 years agoperf symbols: Rename find_symbol routines to find_function
Arnaldo Carvalho de Melo [Tue, 24 Nov 2009 15:01:52 +0000]
perf symbols: Rename find_symbol routines to find_function

Paving the way for supporting variable in adition to function
symbols.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259074912-5924-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf tools: Remove unused wrapper routines
Arnaldo Carvalho de Melo [Tue, 24 Nov 2009 14:05:17 +0000]
perf tools: Remove unused wrapper routines

And also make xrealloc and xmalloc weak symbols so that we don't
have this problem:

 /usr/lib/gcc/x86_64-redhat-linux/4.4.1/../../../../lib64/libiberty.a(xmalloc.o):
 In function `xrealloc':
 (.text+0xc0): multiple definition of `xrealloc'
 libperf.a(wrapper.o):/home/acme_unencrypted/git/linux-2.6-tip/tools/perf/util/wrapper.c:67:
 first defined here
 collect2: ld returned 1 exit status

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259071517-3242-4-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf tools: Introduce zalloc() for the common calloc(1, N) case
Arnaldo Carvalho de Melo [Tue, 24 Nov 2009 14:05:16 +0000]
perf tools: Introduce zalloc() for the common calloc(1, N) case

This way we type less characters and it looks more like the
kzalloc kernel counterpart.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259071517-3242-3-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf symbols: Simplify symbol machinery setup
Arnaldo Carvalho de Melo [Tue, 24 Nov 2009 14:05:15 +0000]
perf symbols: Simplify symbol machinery setup

And also express its configuration toggles via a struct.

Now all one has to do is to call symbol__init(NULL) if the
defaults are OK, or pass a struct symbol_conf pointer with the
desired configuration.

If a tool uses kernel_maps__find_symbol() to look at the kernel
and modules mappings for a symbol but didn't call symbol__init()
first, that will generate a one time warning too, alerting the
subcommand developer that symbol__init() must be called.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259071517-3242-2-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf top: Always show the DSO column, even if its all the same
Arnaldo Carvalho de Melo [Tue, 24 Nov 2009 14:05:14 +0000]
perf top: Always show the DSO column, even if its all the same

Ingo found it confusing, and I agree with that, for 'perf
report' its OK because it is static, but for a tool refreshing
it the eventual switch from column to summary at the top may
seem confusing.

Suggested-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259071517-3242-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf tools: Use common process_event functions for annotate and report
John Kacur [Tue, 24 Nov 2009 14:35:01 +0000]
perf tools: Use common process_event functions for annotate and report

Prevent bit-rot in perf-annotate by using common functions where
possible. Here we create process_events.[ch] to hold the common
functions.

Signed-off-by: John Kacur <jkacur@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: acme@redhat.com
LKML-Reference: <1259073301-11506-3-git-send-email-jkacur@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf tools: Add perf.data to .gitignore
John Kacur [Tue, 24 Nov 2009 14:35:00 +0000]
perf tools: Add perf.data to .gitignore

Signed-off-by: John Kacur <jkacur@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: acme@redhat.com
LKML-Reference: <1259073301-11506-2-git-send-email-jkacur@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoMerge branch 'perf/bench' into perf/core
Ingo Molnar [Tue, 24 Nov 2009 15:36:03 +0000]
Merge branch 'perf/bench' into perf/core

Merge reason: Looks mergable - ready it for the merge window.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf_events: Fix bogus copy_to_user() in perf_event_read_group()
Stephane Eranian [Tue, 24 Nov 2009 05:40:49 +0000]
perf_events: Fix bogus copy_to_user() in perf_event_read_group()

When using an event group, the value and id for non leaders events
were wrong due to invalid offset into the outgoing buffer.

Signed-off-by: Stephane Eranian <eranian@google.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: paulus@samba.org
Cc: perfmon2-devel@lists.sourceforge.net
LKML-Reference: <4b0b71e1.0508d00a.075e.ffff84a3@mx.google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf kmem: Add help file
Li Zefan [Tue, 24 Nov 2009 05:27:11 +0000]
perf kmem: Add help file

Add Documentation/perf-kmem.txt

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: linux-mm@kvack.org <linux-mm@kvack.org>
LKML-Reference: <4B0B6EAF.80802@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf kmem: Measure kmalloc/kfree CPU ping-pong call-sites
Li Zefan [Tue, 24 Nov 2009 05:26:55 +0000]
perf kmem: Measure kmalloc/kfree CPU ping-pong call-sites

Show statistics for allocations and frees on different cpus:

------------------------------------------------------------------------------------------------------
Callsite                           | Total_alloc/Per | Total_req/Per   | Hit   | Ping-pong | Frag
------------------------------------------------------------------------------------------------------
 perf_event_alloc.clone.0+0         |      7504/682   |      7128/648   |     11 |        0 |  5.011%
 alloc_buffer_head+16               |       288/57    |       280/56    |      5 |        0 |  2.778%
 radix_tree_preload+51              |       296/296   |       288/288   |      1 |        0 |  2.703%
 tracepoint_add_probe+32e           |       157/31    |       154/30    |      5 |        0 |  1.911%
 do_maps_open+0                     |       796/12    |       792/12    |     66 |        0 |  0.503%
 sock_alloc_send_pskb+16e           |     23780/495   |     23744/494   |     48 |       38 |  0.151%
 anon_vma_prepare+9a                |      3744/44    |      3740/44    |     85 |        0 |  0.107%
 d_alloc+21                         |     64948/164   |     64944/164   |    396 |        0 |  0.006%
 proc_alloc_inode+23                |    262292/676   |    262288/676   |    388 |        0 |  0.002%
 create_object+28                   |    459600/200   |    459600/200   |   2298 |       71 |  0.000%
 journal_start+67                   |     14440/40    |     14440/40    |    361 |        0 |  0.000%
 get_empty_filp+df                  |     53504/256   |     53504/256   |    209 |        0 |  0.000%
 getname+2a                         |    823296/4096  |    823296/4096  |    201 |        0 |  0.000%
 seq_read+2b0                       |    544768/4096  |    544768/4096  |    133 |        0 |  0.000%
 seq_open+6d                        |     17024/128   |     17024/128   |    133 |        0 |  0.000%
 mmap_region+2e6                    |     11704/88    |     11704/88    |    133 |        0 |  0.000%
 single_open+0                      |      1072/16    |      1072/16    |     67 |        0 |  0.000%
 __alloc_skb+2e                     |     12544/256   |     12544/256   |     49 |       38 |  0.000%
 __sigqueue_alloc+4a                |      1296/144   |      1296/144   |      9 |        8 |  0.000%
 tracepoint_add_probe+6f            |        80/16    |        80/16    |      5 |        0 |  0.000%
------------------------------------------------------------------------------------------------------
...

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: linux-mm@kvack.org <linux-mm@kvack.org>
LKML-Reference: <4B0B6E9F.6020309@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf kmem: Collect cross node allocation statistics
Li Zefan [Tue, 24 Nov 2009 05:26:31 +0000]
perf kmem: Collect cross node allocation statistics

Show cross node memory allocations:

 # ./perf kmem

 SUMMARY
 =======
 ...
 Cross node allocations: 0/3633

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: linux-mm@kvack.org <linux-mm@kvack.org>
LKML-Reference: <4B0B6E87.10906@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf kmem: Default to sort by fragmentation
Li Zefan [Tue, 24 Nov 2009 05:26:10 +0000]
perf kmem: Default to sort by fragmentation

Make the output sort by fragmentation by default.

Also make the usage of "--sort" option consistent with other
perf tools. That is, we support multi keys: "--sort
key1[,key2]...".

 # ./perf kmem --stat caller
 ------------------------------------------------------------------------------
 Callsite                    |Total_alloc/Per | Total_req/Per | Hit  | Frag
 ------------------------------------------------------------------------------
 __netdev_alloc_skb+23       |    5048/1682   |    4564/1521  |     3|   9.588%
 perf_event_alloc.clone.0+0  |    7504/682    |    7128/648   |    11|   5.011%
 tracepoint_add_probe+32e    |     157/31     |     154/30    |     5|   1.911%
 alloc_buffer_head+16        |     456/57     |     448/56    |     8|   1.754%
 radix_tree_preload+51       |     584/292    |     576/288   |     2|   1.370%
 ...

TODO:
- Extract duplicate code in builtin-kmem.c and builtin-sched.c
  into util/sort.c.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: linux-mm@kvack.org <linux-mm@kvack.org>
LKML-Reference: <4B0B6E72.7010200@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf kmem: Add new option to show raw ip
Li Zefan [Tue, 24 Nov 2009 05:25:48 +0000]
perf kmem: Add new option to show raw ip

Add option "--raw-ip" to show raw ip instead of symbols:

 # ./perf kmem --stat caller --raw-ip
 ------------------------------------------------------------------------------
 Callsite                    |Total_alloc/Per | Total_req/Per | Hit  | Frag
 ------------------------------------------------------------------------------
 0xc05301aa                  |  733184/4096   |  733184/4096  |   179|   0.000%
 0xc0542ba0                  |  483328/4096   |  483328/4096  |   118|   0.000%
 ...

Also show symbols with format sym+offset instead of sym/offset.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: linux-mm@kvack.org <linux-mm@kvack.org>
LKML-Reference: <4B0B6E5C.4080900@cn.fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf tools: Fix compilation on powerpc
Paul Mackerras [Tue, 24 Nov 2009 04:19:43 +0000]
perf tools: Fix compilation on powerpc

Currently, perf fails to compile on powerpc with this error:

CC util/header.o
 In file included from util/../perf.h:17,
                  from util/header.c:9:
 util/../../../arch/powerpc/include/asm/unistd.h:360:27: error:
 linux/linkage.h: No such file or directory make: ***
 [util/header.o] Error 1

The reason is that we still have a #define __KERNEL__ in effect
at the point where <asm/unistd.h> gets included, which means we
get extra stuff that we don't need or want.

This fixes the problem by undefining __KERNEL__ once we have
included the file for which we need __KERNEL__ defined.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <19211.24287.453183.78836@cargo.ozlabs.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agohw-breakpoints: Fix misordered ifdef
Frederic Weisbecker [Mon, 23 Nov 2009 21:30:12 +0000]
hw-breakpoints: Fix misordered ifdef

Fix a misplaced ifdef. We need the perf event headers also in
off-case to avoid the following build error:

 include/linux/hw_breakpoint.h:94: error: expected declaration specifiers or '...' before 'perf_callback_t'
 include/linux/hw_breakpoint.h:102: error: expected declaration specifiers or '...' before 'perf_callback_t'
 include/linux/hw_breakpoint.h:109: error: expected declaration specifiers or '...' before 'perf_callback_t'
 include/linux/hw_breakpoint.h:116: error: expected declaration specifiers or '...' before 'perf_callback_t'

Reported-by: Kisskb-bot by Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Prasad <prasad@linux.vnet.ibm.com>
LKML-Reference: <1259011812-8093-1-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf kmem: Resolve symbols
Arnaldo Carvalho de Melo [Mon, 23 Nov 2009 19:51:09 +0000]
perf kmem: Resolve symbols

E.g.:

  [root@doppio linux-2.6-tip]# perf kmem record sleep 3s
  [ perf record: Woken up 2 times to write data ]
  [ perf record: Captured and wrote 0.804 MB perf.data (~35105 samples) ]

  [root@doppio linux-2.6-tip]# perf kmem --stat caller | head -10
  ------------------------------------------------------------------------------
  Callsite                    |Total_alloc/Per | Total_req/Per | Hit  | Frag
  ------------------------------------------------------------------------------
  getname/40                  | 1519616/4096   | 1519616/4096  |   371|   0.000%
  seq_read/a2                 |  987136/4096   |  987136/4096  |   241|   0.000%
  __netdev_alloc_skb/43       |  260368/1049   |  259968/1048  |   248|   0.154%
  __alloc_skb/5a              |   77312/256    |   77312/256   |   302|   0.000%
  proc_alloc_inode/33         |   76480/632    |   76472/632   |   121|   0.010%
  get_empty_filp/8d           |   70272/192    |   70272/192   |   366|   0.000%
  split_vma/8e                |   42064/176    |   42064/176   |   239|   0.000%
  [root@doppio linux-2.6-tip]#

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: linux-mm@kvack.org <linux-mm@kvack.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <1259005869-13487-2-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf tools: Move graph_line and graph_dotted_line from top
Arnaldo Carvalho de Melo [Mon, 23 Nov 2009 19:51:08 +0000]
perf tools: Move graph_line and graph_dotted_line from top

So that they can be used in other tools.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259005869-13487-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf symbols: Look for vmlinux in more places
Arnaldo Carvalho de Melo [Mon, 23 Nov 2009 18:39:10 +0000]
perf symbols: Look for vmlinux in more places

Now that we can check the buildid to see if it really matches,
this can be done safely:

  vmlinux
  /boot/vmlinux
  /boot/vmlinux-<uts.release>
  /lib/modules/<uts.release>/build/vmlinux
  /usr/lib/debug/lib/modules/%s/vmlinux

More can be added - if you know about distros that put the
vmlinux somewhere else please let us know.

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1259001550-8194-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf tools: Add support for breakpoint events in perf tools
Frederic Weisbecker [Mon, 23 Nov 2009 14:42:35 +0000]
perf tools: Add support for breakpoint events in perf tools

Add the breakpoint events support with this new sysnopsis:

  mem:addr[:access]

Where addr is a raw addr value in the kernel and access can be
either [r][w][x]

Example to profile tasklist_lock:

$ grep tasklist_lock /proc/kallsyms
ffffffff8189c000 D tasklist_lock

$ perf record -e mem:0xffffffff8189c000:rw -a -f -c 1
$ perf report

# Samples: 62
#
# Overhead          Command  Shared Object  Symbol
# ........  ...............  .............  ......
#
    29.03%          swapper  [kernel]       [k] _raw_read_trylock
    29.03%          swapper  [kernel]       [k] _raw_read_unlock
    19.35%             init  [kernel]       [k] _raw_read_trylock
    19.35%             init  [kernel]       [k] _raw_read_unlock
     1.61%         events/0  [kernel]       [k] _raw_read_trylock
     1.61%         events/0  [kernel]       [k] _raw_read_unlock

Coming soon:

 - Support for symbols in the event definition.

 - Default period to 1 for breakpoint events because these are
   not high frequency events. The same thing is needed for trace
   events.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Prasad <prasad@linux.vnet.ibm.com>
LKML-Reference: <1258987355-8751-4-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Prasad <prasad@linux.vnet.ibm.com>

10 years agoperf: Add kernel side syscall events support for breakpoints
Frederic Weisbecker [Mon, 23 Nov 2009 14:42:34 +0000]
perf: Add kernel side syscall events support for breakpoints

Add the remaining necessary bits to support breakpoints created
through perf syscall.

We don't use the software counter interface as:

- We don't need to check against recursion, this is already done
  in hardware breakpoints arch level.

- We already know the perf event we are dealing with when the
  event is to be committed.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Prasad <prasad@linux.vnet.ibm.com>
LKML-Reference: <1258987355-8751-3-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agohw-breakpoints: Check the breakpoint params from perf tools
Frederic Weisbecker [Mon, 23 Nov 2009 14:42:33 +0000]
hw-breakpoints: Check the breakpoint params from perf tools

Perf tools create perf events as disabled in the beginning.
Breakpoints are then considered like ptrace temporary
breakpoints, only meant to reserve a breakpoint slot until we
get all the necessary informations from the user.

In this case, we don't check the address that is breakpointed as
it is NULL in the ptrace case.

But perf tools don't have the same purpose, events are created
disabled to wait for all events to be created before enabling
all of them. We want to check the breakpoint parameters in this
case.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Prasad <prasad@linux.vnet.ibm.com>
LKML-Reference: <1258987355-8751-2-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agohw-breakpoints: Include only linux/perf_event.h from kernel part of bp headers
Frederic Weisbecker [Mon, 23 Nov 2009 14:42:32 +0000]
hw-breakpoints: Include only linux/perf_event.h from kernel part of bp headers

As userspace only needs the breakpoints enum types from the
breakpoints headers.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Prasad <prasad@linux.vnet.ibm.com>
LKML-Reference: <1258987355-8751-1-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agohw-breakpoint: Attribute authorship of hw-breakpoint related files
K.Prasad [Mon, 23 Nov 2009 15:47:13 +0000]
hw-breakpoint: Attribute authorship of hw-breakpoint related files

Attribute authorship to developers of hw-breakpoint related
files.

Signed-off-by: K.Prasad <prasad@linux.vnet.ibm.com>
Cc: Alan Stern <stern@rowland.harvard.edu>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091123154713.GA5593@in.ibm.com>
[ v2: moved it to latest -tip ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf_events: Restore sanity to scaling land
Peter Zijlstra [Mon, 23 Nov 2009 14:00:36 +0000]
perf_events: Restore sanity to scaling land

It is quite possible to call update_event_times() on a context
that isn't actually running and thereby confuse the thing.

perf stat was reporting !100% scale values for software counters
(2e2af50b perf_events: Disable events when we detach them,
solved the worst of that, but there was still some left).

The thing that happens is that because we are not self-reaping
(we have a caring parent) there is a time between the last
schedule (out) and having do_exit() called which will detach the
events.

This period would be accounted as enabled,!running because the
event->state==INACTIVE, even though !event->ctx->is_active.

Similar issues could have been observed by calling read() on a
event while the attached task was not scheduled in.

Solve this by teaching update_event_times() about
ctx->is_active.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1258984836.4531.480.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf_events: Undo some recursion damage
Peter Zijlstra [Mon, 23 Nov 2009 10:37:29 +0000]
perf_events: Undo some recursion damage

Make perf_swevent_get_recursion_context return a context number
and disable preemption.

This could be used to remove the IRQ disable from the trace bit
and index the per-cpu buffer with.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <20091123103819.993226816@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf_events: Fix __perf_event_exit_task() vs. update_event_times() locking
Peter Zijlstra [Mon, 23 Nov 2009 10:37:27 +0000]
perf_events: Fix __perf_event_exit_task() vs. update_event_times() locking

Move the update_event_times() call in __perf_event_exit_task()
into list_del_event() because that holds the proper lock
(ctx->lock) and seems a more natural place to do the last time
update.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091123103819.842455480@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf_events: Update the context time on exit
Peter Zijlstra [Mon, 23 Nov 2009 10:37:26 +0000]
perf_events: Update the context time on exit

It appeared we did call update_event_times() on exit, but we
failed to update the context time, which renders the former
moot.

Locking is a bit iffy, we call update_event_times under
ctx->mutex instead of ctx->lock - the next patch fixes this.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091123103819.764207355@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf_events: Disable events when we detach them
Peter Zijlstra [Mon, 23 Nov 2009 10:37:25 +0000]
perf_events: Disable events when we detach them

If we leave the event in STATE_INACTIVE, any read of the event
after the detach will increase the running count but not the
enabled count and cause funny scaling artefacts.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091123103819.689055515@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf_events: Fix style nits
Peter Zijlstra [Mon, 23 Nov 2009 10:37:24 +0000]
perf_events: Fix style nits

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20091123103819.613427378@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf_events: Undo copy/paste damage
Peter Zijlstra [Mon, 23 Nov 2009 10:37:23 +0000]
perf_events: Undo copy/paste damage

We had two almost identical functions, avoid the duplication.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <20091123103819.537537928@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf_events: Optimize the swcounter hotpath
Ingo Molnar [Mon, 23 Nov 2009 09:57:59 +0000]
perf_events: Optimize the swcounter hotpath

The structure init creates a bit memcpy, which shows
up big time in perf annotate output:

          :      ffffffff810a859d <__perf_sw_event>:
     1.68 :      ffffffff810a859d:       55                      push   %rbp
     1.69 :      ffffffff810a859e:       41 89 fa                mov    %edi,%r10d
     0.01 :      ffffffff810a85a1:       49 89 c9                mov    %rcx,%r9
     0.00 :      ffffffff810a85a4:       31 c0                   xor    %eax,%eax
     1.71 :      ffffffff810a85a6:       b9 16 00 00 00          mov    $0x16,%ecx
     0.00 :      ffffffff810a85ab:       48 89 e5                mov    %rsp,%rbp
     0.00 :      ffffffff810a85ae:       48 83 ec 60             sub    $0x60,%rsp
     1.52 :      ffffffff810a85b2:       48 8d 7d a0             lea    -0x60(%rbp),%rdi
    85.20 :      ffffffff810a85b6:       f3 ab                   rep stos %eax,%es:(%rdi)

None of the callees depends on the structure being pre-initialized,
so only initialize ->addr. This gets rid of the memcpy overhead.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf events: Do not generate function trace entries in perf code
Ingo Molnar [Mon, 23 Nov 2009 09:19:20 +0000]
perf events: Do not generate function trace entries in perf code

Decreases perf overhead when function tracing is enabled,
by about 50%.

Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf record, x86: Print more intelligent error message when sampling fails
Simon Kaempflein [Mon, 16 Nov 2009 05:25:53 +0000]
perf record, x86: Print more intelligent error message when sampling fails

Print more accurate error message when "perf record" fails because
there is no APIC support, on x86.

Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf: Use default compiler mode by default
Michael S. Tsirkin [Sun, 22 Nov 2009 12:13:35 +0000]
perf: Use default compiler mode by default

gcc with no flags typically is a sane default for systems to
use, and looking at the running kernel is probably broken for
cross-builds anyway, so let's not do this.  Add EXTRA_CFLAGS so
that users can override default gcc mode if they want to.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Acked-by: Arjan van de Ven <arjan@infradead.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <20091122121335.GA24254@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf report: Do map lookups in resolve_callchain()
Arnaldo Carvalho de Melo [Sun, 22 Nov 2009 16:59:22 +0000]
perf report: Do map lookups in resolve_callchain()

Bug introduced in 439d473b4777de510e1322168ac6f2f377ecd5bc,
making the initial map be used for all IPs, so that symbols
outside this initial map would either be erroneously resolved or
not resolve at all.

Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1258909162-28496-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf symbols: Show messages about module loading only if verbose >= 1
Arnaldo Carvalho de Melo [Sun, 22 Nov 2009 15:21:41 +0000]
perf symbols: Show messages about module loading only if verbose >= 1

Suggested-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <1258903301-20584-1-git-send-email-acme@infradead.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf tools: Suggest static libraries as well
Michael S. Tsirkin [Sun, 22 Nov 2009 13:13:11 +0000]
perf tools: Suggest static libraries as well

On error, suggest installing static libraries
along with shared libraries.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <20091122131311.GA24318@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf tools: Add V=2 option to help debug config issues
Michael S. Tsirkin [Sun, 22 Nov 2009 11:27:27 +0000]
perf tools: Add V=2 option to help debug config issues

Make standard error show up on console when V=2 is set.

Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
LKML-Reference: <20091122112726.GC13644@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf_events: Fix modular build
Ingo Molnar [Sun, 22 Nov 2009 11:20:19 +0000]
perf_events: Fix modular build

Fix:

  ERROR: "perf_swevent_put_recursion_context" [fs/ext4/ext4.ko] undefined!
  ERROR: "perf_swevent_get_recursion_context" [fs/ext4/ext4.ko] undefined!

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Jason Baron <jbaron@redhat.com>
LKML-Reference: <1258864015-10579-1-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf symbols: Fix ELF header errors during "perf kmem record"
Pekka Enberg [Sun, 22 Nov 2009 10:29:44 +0000]
perf symbols: Fix ELF header errors during "perf kmem record"

The write_event() function in builtin-record.c writes out all
mmap()'d DSOs including non-ELF files like GNOME resource files
and such.

Therefore, check for ELF_K_ELF in filename__read_build_id()
before attempting to read the ELF header with gelf_getehdr().

Fixes the following error messages when running "perf kmem
record":

  penberg@penberg-laptop:~/src/linux/tools/perf$ perf kmem record
  ^C[ perf record: Woken up 2 times to write data ]
  [ perf record: Captured and wrote 0.753 MB perf.data (~32885 samples) ]
  filename__read_build_id: cannot get elf header.
  filename__read_build_id: cannot get elf header.
  filename__read_build_id: cannot get elf header.
  filename__read_build_id: cannot get elf header.
  filename__read_build_id: cannot get elf header.
  filename__read_build_id: cannot get elf header.
  filename__read_build_id: cannot get elf header.
  filename__read_build_id: cannot get elf header.
  filename__read_build_id: cannot get elf header.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
LKML-Reference: <1258885784-11709-1-git-send-email-penberg@cs.helsinki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf kmem: Add --sort hit and --sort frag
Pekka Enberg [Sun, 22 Nov 2009 09:58:00 +0000]
perf kmem: Add --sort hit and --sort frag

This patch adds support for "--sort hit" and "--sort frag" to
the "perf kmem" tool. The former was already mentioned in the
help text and the latter is useful for finding call-sites that
exhibit worst case behavior for SLAB allocators.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Cc: linux-mm@kvack.org <linux-mm@kvack.org>
LKML-Reference: <1258883880-7149-1-git-send-email-penberg@cs.helsinki.fi>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf_event: Remove redundant zero fill
Márton Németh [Sat, 21 Nov 2009 22:10:15 +0000]
perf_event: Remove redundant zero fill

The buffer is first zeroed out by memset(). Then strncpy() is
used to fill the content. The strncpy() function also pads the
string till the end of the specified length, which is redundant.
The strncpy() does not ensures that the string will be properly
closed with 0. Use strlcpy() instead.

The semantic match that finds this kind of pattern is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression buffer;
expression size;
expression str;
@@
memset(buffer, 0, size);
...
- strncpy(
+ strlcpy(
buffer, str, sizeof(buffer)
);
@@
expression buffer;
expression size;
expression str;
@@
memset(&buffer, 0, size);
...
- strncpy(
+ strlcpy(
&buffer, str, sizeof(buffer));
@@
expression buffer;
identifier field;
expression size;
expression str;
@@
memset(buffer, 0, size);
...
- strncpy(
+ strlcpy(
buffer->field, str, sizeof(buffer->field)
);
@@
expression buffer;
identifier field;
expression size;
expression str;
@@
memset(&buffer, 0, size);
...
- strncpy(
+ strlcpy(
buffer.field, str, sizeof(buffer.field));
// </smpl>

On strncpy() vs strlcpy() see
http://www.gratisoft.us/todd/papers/strlcpy.html .

Signed-off-by: Márton Németh <nm127@freemail.hu>
Cc: Julia Lawall <julia@diku.dk>
Cc: cocci@diku.dk
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
LKML-Reference: <4B086547.5040100@freemail.hu>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agoperf bench: Make the mem/memcpy tests more user-friendly
Hitoshi Mitake [Fri, 20 Nov 2009 03:37:17 +0000]
perf bench: Make the mem/memcpy tests more user-friendly

mem-memcpy.c uses perf event system calls to obtain CPU clocks.
And it suddenly dies with BUG_ON() when it running on Linux
doesn't support perf event.

Also fail at calloc() can occur easily when too large
length is passed. Fail of calloc() causes sudden death
with assert().

These behaviours are not friendly. So I fixed the treating of
errors.

Signed-off-by: Hitoshi Mitake <mitake@dcl.info.waseda.ac.jp>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1258688237-3797-1-git-send-email-mitake@dcl.info.waseda.ac.jp>
[ v2: improved a few small details ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agohw-breakpoints: Separate the kernel part from breakpoint headers
Frederic Weisbecker [Sun, 22 Nov 2009 04:21:35 +0000]
hw-breakpoints: Separate the kernel part from breakpoint headers

So that we can include this header from userspace tools, like
perf tools, to get the breakpoint types and len definitions.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Prasad <prasad@linux.vnet.ibm.com>
LKML-Reference: <1258863695-10464-4-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agohw-breakpoints: Remove x86 specific headers from core file
Frederic Weisbecker [Sun, 22 Nov 2009 04:21:34 +0000]
hw-breakpoints: Remove x86 specific headers from core file

Remove asm/processor.h and asm/debugreg.h as these headers are
not used anymore in the hw-breakpoints core file.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Prasad <prasad@linux.vnet.ibm.com>
LKML-Reference: <1258863695-10464-3-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotracing: Forget about the NMI buffer for syscall events
Frederic Weisbecker [Sun, 22 Nov 2009 04:21:33 +0000]
tracing: Forget about the NMI buffer for syscall events

We are never in an NMI context when we commit a syscall trace to
perf. So just forget about the nmi buffer there.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Jason Baron <jbaron@redhat.com>
LKML-Reference: <1258863695-10464-2-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>

10 years agotracing: Use the perf recursion protection from trace event
Frederic Weisbecker [Sun, 22 Nov 2009 04:26:55 +0000]
tracing: Use the perf recursion protection from trace event

When we commit a trace to perf, we first check if we are
recursing in the same buffer so that we don't mess-up the buffer
with a recursing trace. But later on, we do the same check from
perf to avoid commit recursion. The recursion check is desired
early before we touch the buffer but we want to do this check
only once.

Then export the recursion protection from perf and use it from
the trace events before submitting a trace.

v2: Put appropriate Reported-by tag

Reported-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Jason Baron <jbaron@redhat.com>
LKML-Reference: <1258864015-10579-1-git-send-email-fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>