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authorFrederic Weisbecker <fweisbec@gmail.com>2009-09-14 08:57:15 +0200
committerIngo Molnar <mingo@elte.hu>2009-09-14 09:52:23 +0200
commitd13025222cdb0043e2239b3b819389358bb31bc0 (patch)
tree9bac1060f41da9f2d35f194749428a23dde8290c /tools/perf/builtin-record.c
parentf977bb4937857994312fff4f9c2cad336a36a932 (diff)
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/perf/builtin-record.c')
-rw-r--r--tools/perf/builtin-record.c6
1 files changed, 6 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()
};