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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2009-09-14 08:57:15 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-14 09:52:23 +0200 |
| commit | d13025222cdb0043e2239b3b819389358bb31bc0 (patch) | |
| tree | 9bac1060f41da9f2d35f194749428a23dde8290c /tools | |
| parent | f977bb4937857994312fff4f9c2cad336a36a932 (diff) | |
| download | lwn-d13025222cdb0043e2239b3b819389358bb31bc0.tar.gz lwn-d13025222cdb0043e2239b3b819389358bb31bc0.zip | |
perf tools: Add an option to multiplex counters in a single channel
Add an option to multiplex counters output in the channel of
the group leader, ie: the first counter opened:
-M --multiplex
The effect is better serialized samples. This is especially
useful for tracepoint samples that need to be well serialized
for their post-processing.
Also make use of this option in 'perf sched'.
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/perf/builtin-record.c | 6 | ||||
| -rw-r--r-- | tools/perf/builtin-sched.c | 2 |
2 files changed, 8 insertions, 0 deletions
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 99a12fe86e9f..79f99dba5be0 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -48,6 +48,7 @@ static int call_graph = 0; static int inherit_stat = 0; static int no_samples = 0; static int sample_address = 0; +static int multiplex = 0; static long samples; static struct timeval last_read; @@ -485,6 +486,9 @@ try_again: exit(-1); } + if (multiplex && fd[nr_cpu][counter] != group_fd) + ioctl(fd[nr_cpu][counter], PERF_COUNTER_IOC_SET_OUTPUT, group_fd); + ioctl(fd[nr_cpu][counter], PERF_COUNTER_IOC_ENABLE); } @@ -681,6 +685,8 @@ static const struct option options[] = { "Sample addresses"), OPT_BOOLEAN('n', "no-samples", &no_samples, "don't sample"), + OPT_BOOLEAN('M', "multiplex", &multiplex, + "multiplex counter output in a single channel"), OPT_END() }; diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c index 8db0fd222f80..686af633b35b 100644 --- a/tools/perf/builtin-sched.c +++ b/tools/perf/builtin-sched.c @@ -1660,6 +1660,8 @@ static const char *record_args[] = { "record", "-a", "-R", + "-M", + "-g", "-c", "1", "-e", "sched:sched_switch:r", "-e", "sched:sched_stat_wait:r", |