diff options
| author | Adrian Hunter <adrian.hunter@intel.com> | 2013-11-15 15:52:29 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2013-11-27 14:58:36 -0300 |
| commit | 3aa5939d71fa22a947808ba9c798b8537c35097a (patch) | |
| tree | b127f8c885ade7568c24230d0c9e68a693877eae /tools/perf/Documentation | |
| parent | e944d3d7d151eea149c62310eaff7b92c7732f58 (diff) | |
perf record: Make per-cpu mmaps the default.
This affects the -p, -t and -u options that previously defaulted to
per-thread mmaps.
Consequently add an option to select per-thread mmaps to support the old
behaviour.
Note that per-thread can be used with a workload-only (i.e. none of -p,
-t, -u, -a or -C is selected) to get a per-thread mmap with no
inheritance.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: David Ahern <dsahern@gmail.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@gmail.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/5286271D.3020808@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation')
| -rw-r--r-- | tools/perf/Documentation/perf-record.txt | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index 43b42c4f4a91..6ac867e7667f 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -201,11 +201,11 @@ abort events and some memory events in precise mode on modern Intel CPUs. --transaction:: Record transaction flags for transaction related events. ---force-per-cpu:: -Force the use of per-cpu mmaps. By default, when tasks are specified (i.e. -p, --t or -u options) per-thread mmaps are created. This option overrides that and -forces per-cpu mmaps. A side-effect of that is that inheritance is -automatically enabled. Add the -i option also to disable inheritance. +--per-thread:: +Use per-thread mmaps. By default per-cpu mmaps are created. This option +overrides that and uses per-thread mmaps. A side-effect of that is that +inheritance is automatically disabled. --per-thread is ignored with a warning +if combined with -a or -C options. SEE ALSO -------- |