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| author | Stephane Eranian <eranian@google.com> | 2010-05-12 10:40:01 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2010-05-13 16:39:12 -0300 |
| commit | 2e6cdf996ba43ce0b090ffbf754f83e17362cd69 (patch) | |
| tree | bb471a4ae13fa3941612c30c75bead7417084667 /tools/perf/builtin-stat.c | |
| parent | 8a0ecfb8b47dc765fdf460913231876bbc95385e (diff) | |
| download | linux-2e6cdf996ba43ce0b090ffbf754f83e17362cd69.tar.bz2 | |
perf tools: change event inheritance logic in stat and record
By default, event inheritance across fork and pthread_create was on but the -i
option of stat and record, which enabled inheritance, led to believe it was off
by default.
This patch fixes this logic by inverting the meaning of the -i option. By
default inheritance is on whether you attach to a process (-p), a thread (-t)
or start a process. If you pass -i, then you turn off inheritance. Turning off
inheritance if you don't need it, helps limit perf resource usage as well.
The patch also fixes perf stat -t xxxx and perf record -t xxxx which did not
start the counters.
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: David S. Miller <davem@davemloft.net>
Cc: Frédéric Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <4bea9d2f.d60ce30a.0b5b.08e1@mx.google.com>
Signed-off-by: Stephane Eranian <eranian@google.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-stat.c')
| -rw-r--r-- | tools/perf/builtin-stat.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index e619ac89dff5..ff8c413b7e73 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -72,7 +72,7 @@ static unsigned int nr_cpus = 0; static int run_idx = 0; static int run_count = 1; -static bool inherit = true; +static bool no_inherit = false; static bool scale = true; static pid_t target_pid = -1; static pid_t target_tid = -1; @@ -167,8 +167,8 @@ static int create_perf_stat_counter(int counter) ++ncreated; } } else { - attr->inherit = inherit; - if (target_pid == -1) { + attr->inherit = !no_inherit; + if (target_pid == -1 && target_tid == -1) { attr->disabled = 1; attr->enable_on_exec = 1; } @@ -518,8 +518,8 @@ static const struct option options[] = { OPT_CALLBACK('e', "event", NULL, "event", "event selector. use 'perf list' to list available events", parse_events), - OPT_BOOLEAN('i', "inherit", &inherit, - "child tasks inherit counters"), + OPT_BOOLEAN('i', "no-inherit", &no_inherit, + "child tasks do not inherit counters"), OPT_INTEGER('p', "pid", &target_pid, "stat events on existing process id"), OPT_INTEGER('t', "tid", &target_tid, |