tracing: Remove boot tracer
Américo Wang [Wed, 26 May 2010 10:57:53 +0000 (18:57 +0800)]
The boot tracer is useless. It simply logs the initcalls
but in fact these initcalls are also logged through printk
while using the initcall_debug kernel parameter.

Nobody seem to be using it so far. Then just remove it.

Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com>
Cc: Chase Douglas <chase.douglas@canonical.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Li Zefan <lizf@cn.fujitsu.com>
LKML-Reference: <20100526105753.GA5677@cr0.nay.redhat.com>
[ remove the hooks in main.c, and the headers ]
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>

include/trace/boot.h [deleted file]
init/main.c
kernel/trace/Kconfig
kernel/trace/Makefile
kernel/trace/trace.c
kernel/trace/trace.h
kernel/trace/trace_boot.c [deleted file]
kernel/trace/trace_entries.h

diff --git a/include/trace/boot.h b/include/trace/boot.h
deleted file mode 100644 (file)
index 088ea08..0000000
+++ /dev/null
@@ -1,60 +0,0 @@
-#ifndef _LINUX_TRACE_BOOT_H
-#define _LINUX_TRACE_BOOT_H
-
-#include <linux/module.h>
-#include <linux/kallsyms.h>
-#include <linux/init.h>
-
-/*
- * Structure which defines the trace of an initcall
- * while it is called.
- * You don't have to fill the func field since it is
- * only used internally by the tracer.
- */
-struct boot_trace_call {
-       pid_t                   caller;
-       char                    func[KSYM_SYMBOL_LEN];
-};
-
-/*
- * Structure which defines the trace of an initcall
- * while it returns.
- */
-struct boot_trace_ret {
-       char                    func[KSYM_SYMBOL_LEN];
-       int                             result;
-       unsigned long long      duration;               /* nsecs */
-};
-
-#ifdef CONFIG_BOOT_TRACER
-/* Append the traces on the ring-buffer */
-extern void trace_boot_call(struct boot_trace_call *bt, initcall_t fn);
-extern void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn);
-
-/* Tells the tracer that smp_pre_initcall is finished.
- * So we can start the tracing
- */
-extern void start_boot_trace(void);
-
-/* Resume the tracing of other necessary events
- * such as sched switches
- */
-extern void enable_boot_trace(void);
-
-/* Suspend this tracing. Actually, only sched_switches tracing have
- * to be suspended. Initcalls doesn't need it.)
- */
-extern void disable_boot_trace(void);
-#else
-static inline
-void trace_boot_call(struct boot_trace_call *bt, initcall_t fn) { }
-
-static inline
-void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn) { }
-
-static inline void start_boot_trace(void) { }
-static inline void enable_boot_trace(void) { }
-static inline void disable_boot_trace(void) { }
-#endif /* CONFIG_BOOT_TRACER */
-
-#endif /* __LINUX_TRACE_BOOT_H */
index 3bdb152..94f65ef 100644 (file)
@@ -70,7 +70,6 @@
 #include <linux/sfi.h>
 #include <linux/shmem_fs.h>
 #include <linux/slab.h>
-#include <trace/boot.h>
 
 #include <asm/io.h>
 #include <asm/bugs.h>
@@ -715,38 +714,33 @@ int initcall_debug;
 core_param(initcall_debug, initcall_debug, bool, 0644);
 
 static char msgbuf[64];
-static struct boot_trace_call call;
-static struct boot_trace_ret ret;
 
 int do_one_initcall(initcall_t fn)
 {
        int count = preempt_count();
        ktime_t calltime, delta, rettime;
+       unsigned long long duration;
+       int ret;
 
        if (initcall_debug) {
-               call.caller = task_pid_nr(current);
-               printk("calling  %pF @ %i\n", fn, call.caller);
+               printk("calling  %pF @ %i\n", fn, task_pid_nr(current));
                calltime = ktime_get();
-               trace_boot_call(&call, fn);
-               enable_boot_trace();
        }
 
-       ret.result = fn();
+       ret = fn();
 
        if (initcall_debug) {
-               disable_boot_trace();
                rettime = ktime_get();
                delta = ktime_sub(rettime, calltime);
-               ret.duration = (unsigned long long) ktime_to_ns(delta) >> 10;
-               trace_boot_ret(&ret, fn);
-               printk("initcall %pF returned %d after %Ld usecs\n", fn,
-                       ret.result, ret.duration);
+               duration = (unsigned long long) ktime_to_ns(delta) >> 10;
+               printk("initcall %pF returned %d after %lld usecs\n", fn,
+                       ret, duration);
        }
 
        msgbuf[0] = 0;
 
-       if (ret.result && ret.result != -ENODEV && initcall_debug)
-               sprintf(msgbuf, "error code %d ", ret.result);
+       if (ret && ret != -ENODEV && initcall_debug)
+               sprintf(msgbuf, "error code %d ", ret);
 
        if (preempt_count() != count) {
                strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf));
@@ -760,7 +754,7 @@ int do_one_initcall(initcall_t fn)
                printk("initcall %pF returned with %s\n", fn, msgbuf);
        }
 
-       return ret.result;
+       return ret;
 }
 
 
@@ -880,7 +874,6 @@ static int __init kernel_init(void * unused)
        smp_prepare_cpus(setup_max_cpus);
 
        do_pre_smp_initcalls();
-       start_boot_trace();
 
        smp_init();
        sched_init_smp();
index 8b1797c..572992a 100644 (file)
@@ -229,23 +229,6 @@ config FTRACE_SYSCALLS
        help
          Basic tracer to catch the syscall entry and exit events.
 
-config BOOT_TRACER
-       bool "Trace boot initcalls"
-       select GENERIC_TRACER
-       select CONTEXT_SWITCH_TRACER
-       help
-         This tracer helps developers to optimize boot times: it records
-         the timings of the initcalls and traces key events and the identity
-         of tasks that can cause boot delays, such as context-switches.
-
-         Its aim is to be parsed by the scripts/bootgraph.pl tool to
-         produce pretty graphics about boot inefficiencies, giving a visual
-         representation of the delays during initcalls - but the raw
-         /debug/tracing/trace text output is readable too.
-
-         You must pass in initcall_debug and ftrace=initcall to the kernel
-         command line to enable this on bootup.
-
 config TRACE_BRANCH_PROFILING
        bool
        select GENERIC_TRACER
index ffb1a5b..c3aaeba 100644 (file)
@@ -38,7 +38,6 @@ obj-$(CONFIG_SCHED_TRACER) += trace_sched_wakeup.o
 obj-$(CONFIG_NOP_TRACER) += trace_nop.o
 obj-$(CONFIG_STACK_TRACER) += trace_stack.o
 obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
-obj-$(CONFIG_BOOT_TRACER) += trace_boot.o
 obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
 obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
 obj-$(CONFIG_KMEMTRACE) += kmemtrace.o
index 55e4851..036fbc2 100644 (file)
@@ -4603,9 +4603,6 @@ __init static int tracer_alloc_buffers(void)
 
        register_tracer(&nop_trace);
        current_trace = &nop_trace;
-#ifdef CONFIG_BOOT_TRACER
-       register_tracer(&boot_tracer);
-#endif
        /* All seems OK, enable tracing */
        tracing_disabled = 0;
 
index 2cd9639..75a5e80 100644 (file)
@@ -9,10 +9,8 @@
 #include <linux/mmiotrace.h>
 #include <linux/tracepoint.h>
 #include <linux/ftrace.h>
-#include <trace/boot.h>
 #include <linux/kmemtrace.h>
 #include <linux/hw_breakpoint.h>
-
 #include <linux/trace_seq.h>
 #include <linux/ftrace_event.h>
 
@@ -29,8 +27,6 @@ enum trace_type {
        TRACE_MMIO_RW,
        TRACE_MMIO_MAP,
        TRACE_BRANCH,
-       TRACE_BOOT_CALL,
-       TRACE_BOOT_RET,
        TRACE_GRAPH_RET,
        TRACE_GRAPH_ENT,
        TRACE_USER_STACK,
@@ -48,8 +44,6 @@ enum kmemtrace_type_id {
        KMEMTRACE_TYPE_PAGES,           /* __get_free_pages() and friends. */
 };
 
-extern struct tracer boot_tracer;
-
 #undef __field
 #define __field(type, item)            type    item;
 
@@ -209,8 +203,6 @@ extern void __ftrace_bad_type(void);
                          TRACE_MMIO_RW);                               \
                IF_ASSIGN(var, ent, struct trace_mmiotrace_map,         \
                          TRACE_MMIO_MAP);                              \
-               IF_ASSIGN(var, ent, struct trace_boot_call, TRACE_BOOT_CALL);\
-               IF_ASSIGN(var, ent, struct trace_boot_ret, TRACE_BOOT_RET);\
                IF_ASSIGN(var, ent, struct trace_branch, TRACE_BRANCH); \
                IF_ASSIGN(var, ent, struct ftrace_graph_ent_entry,      \
                          TRACE_GRAPH_ENT);             \
diff --git a/kernel/trace/trace_boot.c b/kernel/trace/trace_boot.c
deleted file mode 100644 (file)
index c21d5f3..0000000
+++ /dev/null
@@ -1,185 +0,0 @@
-/*
- * ring buffer based initcalls tracer
- *
- * Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
- *
- */
-
-#include <linux/init.h>
-#include <linux/debugfs.h>
-#include <linux/ftrace.h>
-#include <linux/kallsyms.h>
-#include <linux/time.h>
-
-#include "trace.h"
-#include "trace_output.h"
-
-static struct trace_array *boot_trace;
-static bool pre_initcalls_finished;
-
-/* Tells the boot tracer that the pre_smp_initcalls are finished.
- * So we are ready .
- * It doesn't enable sched events tracing however.
- * You have to call enable_boot_trace to do so.
- */
-void start_boot_trace(void)
-{
-       pre_initcalls_finished = true;
-}
-
-void enable_boot_trace(void)
-{
-       if (boot_trace && pre_initcalls_finished)
-               tracing_start_sched_switch_record();
-}
-
-void disable_boot_trace(void)
-{
-       if (boot_trace && pre_initcalls_finished)
-               tracing_stop_sched_switch_record();
-}
-
-static int boot_trace_init(struct trace_array *tr)
-{
-       boot_trace = tr;
-
-       if (!tr)
-               return 0;
-
-       tracing_reset_online_cpus(tr);
-
-       tracing_sched_switch_assign_trace(tr);
-       return 0;
-}
-
-static enum print_line_t
-initcall_call_print_line(struct trace_iterator *iter)
-{
-       struct trace_entry *entry = iter->ent;
-       struct trace_seq *s = &iter->seq;
-       struct trace_boot_call *field;
-       struct boot_trace_call *call;
-       u64 ts;
-       unsigned long nsec_rem;
-       int ret;
-
-       trace_assign_type(field, entry);
-       call = &field->boot_call;
-       ts = iter->ts;
-       nsec_rem = do_div(ts, NSEC_PER_SEC);
-
-       ret = trace_seq_printf(s, "[%5ld.%09ld] calling  %s @ %i\n",
-                       (unsigned long)ts, nsec_rem, call->func, call->caller);
-
-       if (!ret)
-               return TRACE_TYPE_PARTIAL_LINE;
-       else
-               return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t
-initcall_ret_print_line(struct trace_iterator *iter)
-{
-       struct trace_entry *entry = iter->ent;
-       struct trace_seq *s = &iter->seq;
-       struct trace_boot_ret *field;
-       struct boot_trace_ret *init_ret;
-       u64 ts;
-       unsigned long nsec_rem;
-       int ret;
-
-       trace_assign_type(field, entry);
-       init_ret = &field->boot_ret;
-       ts = iter->ts;
-       nsec_rem = do_div(ts, NSEC_PER_SEC);
-
-       ret = trace_seq_printf(s, "[%5ld.%09ld] initcall %s "
-                       "returned %d after %llu msecs\n",
-                       (unsigned long) ts,
-                       nsec_rem,
-                       init_ret->func, init_ret->result, init_ret->duration);
-
-       if (!ret)
-               return TRACE_TYPE_PARTIAL_LINE;
-       else
-               return TRACE_TYPE_HANDLED;
-}
-
-static enum print_line_t initcall_print_line(struct trace_iterator *iter)
-{
-       struct trace_entry *entry = iter->ent;
-
-       switch (entry->type) {
-       case TRACE_BOOT_CALL:
-               return initcall_call_print_line(iter);
-       case TRACE_BOOT_RET:
-               return initcall_ret_print_line(iter);
-       default:
-               return TRACE_TYPE_UNHANDLED;
-       }
-}
-
-struct tracer boot_tracer __read_mostly =
-{
-       .name           = "initcall",
-       .init           = boot_trace_init,
-       .reset          = tracing_reset_online_cpus,
-       .print_line     = initcall_print_line,
-};
-
-void trace_boot_call(struct boot_trace_call *bt, initcall_t fn)
-{
-       struct ftrace_event_call *call = &event_boot_call;
-       struct ring_buffer_event *event;
-       struct ring_buffer *buffer;
-       struct trace_boot_call *entry;
-       struct trace_array *tr = boot_trace;
-
-       if (!tr || !pre_initcalls_finished)
-               return;
-
-       /* Get its name now since this function could
-        * disappear because it is in the .init section.
-        */
-       sprint_symbol(bt->func, (unsigned long)fn);
-       preempt_disable();
-
-       buffer = tr->buffer;
-       event = trace_buffer_lock_reserve(buffer, TRACE_BOOT_CALL,
-                                         sizeof(*entry), 0, 0);
-       if (!event)
-               goto out;
-       entry   = ring_buffer_event_data(event);
-       entry->boot_call = *bt;
-       if (!filter_check_discard(call, entry, buffer, event))
-               trace_buffer_unlock_commit(buffer, event, 0, 0);
- out:
-       preempt_enable();
-}
-
-void trace_boot_ret(struct boot_trace_ret *bt, initcall_t fn)
-{
-       struct ftrace_event_call *call = &event_boot_ret;
-       struct ring_buffer_event *event;
-       struct ring_buffer *buffer;
-       struct trace_boot_ret *entry;
-       struct trace_array *tr = boot_trace;
-
-       if (!tr || !pre_initcalls_finished)
-               return;
-
-       sprint_symbol(bt->func, (unsigned long)fn);
-       preempt_disable();
-
-       buffer = tr->buffer;
-       event = trace_buffer_lock_reserve(buffer, TRACE_BOOT_RET,
-                                         sizeof(*entry), 0, 0);
-       if (!event)
-               goto out;
-       entry   = ring_buffer_event_data(event);
-       entry->boot_ret = *bt;
-       if (!filter_check_discard(call, entry, buffer, event))
-               trace_buffer_unlock_commit(buffer, event, 0, 0);
- out:
-       preempt_enable();
-}
index dc008c1..c293364 100644 (file)
@@ -271,33 +271,6 @@ FTRACE_ENTRY(mmiotrace_map, trace_mmiotrace_map,
                 __entry->map_id, __entry->opcode)
 );
 
-FTRACE_ENTRY(boot_call, trace_boot_call,
-
-       TRACE_BOOT_CALL,
-
-       F_STRUCT(
-               __field_struct( struct boot_trace_call, boot_call       )
-               __field_desc(   pid_t,  boot_call,      caller          )
-               __array_desc(   char,   boot_call,      func,   KSYM_SYMBOL_LEN)
-       ),
-
-       F_printk("%d  %s", __entry->caller, __entry->func)
-);
-
-FTRACE_ENTRY(boot_ret, trace_boot_ret,
-
-       TRACE_BOOT_RET,
-
-       F_STRUCT(
-               __field_struct( struct boot_trace_ret,  boot_ret        )
-               __array_desc(   char,   boot_ret,       func,   KSYM_SYMBOL_LEN)
-               __field_desc(   int,    boot_ret,       result          )
-               __field_desc(   unsigned long, boot_ret, duration       )
-       ),
-
-       F_printk("%s %d %lx",
-                __entry->func, __entry->result, __entry->duration)
-);
 
 #define TRACE_FUNC_SIZE 30
 #define TRACE_FILE_SIZE 20