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perf_counter: Provide a way to enable counters on exec

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This provides a way to mark a counter to be enabled on the next
exec. This is useful for measuring the total activity of a
program without including overhead from the process that
launches it.

This also changes the perf stat command to use this new
facility.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <19017.43927.838745.689203@cargo.ozlabs.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Paul Mackerras
2009-06-30 16:07:19 +10:00
committed by Ingo Molnar
parent 051ae7f734
commit 57e7986ed1
3 changed files with 55 additions and 4 deletions
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6
tools/perf/builtin-stat.c
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@@ -116,8 +116,9 @@ static void create_perf_stat_counter(int counter, int pid)
fd[cpu][counter], strerror(errno));
}
} else {
attr->inherit = inherit;
attr->disabled = 1;
attr->inherit = inherit;
attr->disabled = 1;
attr->enable_on_exec = 1;
fd[0][counter] = sys_perf_counter_open(attr, pid, -1, -1, 0);
if (fd[0][counter] < 0 && verbose)
@@ -262,7 +263,6 @@ static int run_perf_stat(int argc, const char **argv)
* Enable counters and exec the command:
*/
t0 = rdclock();
prctl(PR_TASK_PERF_COUNTERS_ENABLE);
close(go_pipe[1]);
wait(&status);