perf probe: Search concrete out-of-line instances
authorMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Thu, 11 Aug 2011 11:03:11 +0000 (20:03 +0900)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Fri, 12 Aug 2011 12:32:10 +0000 (09:32 -0300)
commitdb0d2c6420eeb8fd669bac84d72f1ab828bbaa64
treeda076fa408f501005fc851a28bbade134ad4ca62
parentf182e3e13ca71b64b40fab1aef31fa6a78271648
perf probe: Search concrete out-of-line instances

gcc 4.6 generates a concrete out-of-line instance when there is a
function which is implicitly inlined somewhere but also has its own
instance. The concrete out-of-line instance means that it has an
abstract origin of the function which is referred by not only
inlined-subroutines but also a concrete subprogram.

Since current dwarf_func_inline_instances() can find only instances of
inlined-subroutines, this introduces new die_walk_instances() to find
both of subprogram and inlined-subroutines.

e.g. without this,
Available variables at sched_group_rt_period
        @<cpu_rt_period_read_uint+9>
                struct task_group*      tg

perf probe failed to find actual subprogram instance of
sched_group_rt_period().

With this,

Available variables at sched_group_rt_period
        @<cpu_rt_period_read_uint+9>
                struct task_group*      tg
        @<sched_group_rt_period+0>
                struct task_group*      tg

Now it found the sched_group_rt_period() itself.

Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: yrl.pp-manager.tt@hitachi.com
Link: http://lkml.kernel.org/r/20110811110311.19900.63997.stgit@fedora15
Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
tools/perf/util/dwarf-aux.c
tools/perf/util/dwarf-aux.h
tools/perf/util/probe-finder.c