Commit-ID: d13025222cdb0043e2239b3b819389358bb31bc0
Gitweb: http://git.kernel.org/tip/d13025222cdb0043e2239b3b819389358bb31bc0
Author: Frederic Weisbecker <fweisbec@xxxxxxxxx>
AuthorDate: Mon, 14 Sep 2009 08:57:15 +0200
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Mon, 14 Sep 2009 09:52:23 +0200
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@xxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
tools/perf/builtin-record.c | 6 ++++++
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 99a12fe..79f99db 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 8db0fd2..686af63 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",
--
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