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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 21:39:12 +0200 |
| commit | 2e6cdf996ba43ce0b090ffbf754f83e17362cd69 (patch) | |
| tree | bb471a4ae13fa3941612c30c75bead7417084667 /tools/perf/Documentation/perf-stat.txt | |
| parent | perf hist: Fix missing getline declaration (diff) | |
| download | linux-2e6cdf996ba43ce0b090ffbf754f83e17362cd69.tar.xz 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/Documentation/perf-stat.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-stat.txt | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt index 484080dd5b6f..2cab8e8c33d0 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 |