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authorStephane Eranian <eranian@google.com>2010-05-12 10:40:01 +0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2010-05-13 16:39:12 -0300
commit2e6cdf996ba43ce0b090ffbf754f83e17362cd69 (patch)
treebb471a4ae13fa3941612c30c75bead7417084667 /tools/perf/builtin-stat.c
parent8a0ecfb8b47dc765fdf460913231876bbc95385e (diff)
downloadblackbird-op-linux-2e6cdf996ba43ce0b090ffbf754f83e17362cd69.tar.gz
blackbird-op-linux-2e6cdf996ba43ce0b090ffbf754f83e17362cd69.zip
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.c10
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,
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