diff options
| author | Paul Mackerras <paulus@samba.org> | 2009-06-30 08:07:19 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-06-30 12:00:16 +0200 |
| commit | 57e7986ed142417498155ebcd5eaf617ac37136d (patch) | |
| tree | 81ce9acd79ee7e6383dfd5cdadc4e016a012990e /tools/perf | |
| parent | perf_counter tools: Reduce perf stat measurement overhead/skew (diff) | |
| download | linux-57e7986ed142417498155ebcd5eaf617ac37136d.tar.xz linux-57e7986ed142417498155ebcd5eaf617ac37136d.zip | |
perf_counter: Provide a way to enable counters on exec
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>
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/builtin-stat.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 201ef2367dcb..2e03524a1de0 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -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); |