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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/Documentation/perf-stat.txt
parent8a0ecfb8b47dc765fdf460913231876bbc95385e (diff)
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/Documentation/perf-stat.txt')
-rw-r--r--tools/perf/Documentation/perf-stat.txt4
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index 484080dd5b6..2cab8e8c33d 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -31,8 +31,8 @@ OPTIONS
hexadecimal event descriptor.
-i::
---inherit::
- child tasks inherit counters
+--no-inherit::
+ child tasks do not inherit counters
-p::
--pid=<pid>::
stat events on existing pid