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authorJiri Olsa <jolsa@kernel.org>2020-12-27 02:20:38 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2021-01-20 20:34:21 +0300
commit47fddcb479e73c341fb414e40a89572dacadd360 (patch)
tree6a968b553d33efc8b1abb4b1814650a23c46f365 /tools/perf/builtin-stat.c
parentf186cd614878dc886edea5df42ca3225d5ab97ea (diff)
downloadlinux-47fddcb479e73c341fb414e40a89572dacadd360.tar.xz
perf tools: Add 'ping' control command
Add a control 'ping' command to detect if perf is up and its control interface is operational. It will be used in following daemon patches to synchronize with record session - when control interface is up and running, we know that perf record is monitoring and ready to receive signals. Example session: terminal 1: # mkfifo control ack # perf record --control=fifo:control,ack terminal 2: # echo ping > control # cat ack ack Signed-off-by: Jiri Olsa <jolsa@kernel.org> Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com> Acked-by: Namhyung Kim <namhyung@kernel.org> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Alexei Budankov <abudankov@huawei.com> Cc: Ian Rogers <irogers@google.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Michael Petlan <mpetlan@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lore.kernel.org/lkml/20201226232038.390883-5-jolsa@kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/builtin-stat.c')
-rw-r--r--tools/perf/builtin-stat.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 46a3f4ab1371..a380e38ca937 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -623,6 +623,7 @@ static void process_evlist(struct evlist *evlist, unsigned int interval)
case EVLIST_CTL_CMD_UNSUPPORTED:
case EVLIST_CTL_CMD_EVLIST:
case EVLIST_CTL_CMD_STOP:
+ case EVLIST_CTL_CMD_PING:
default:
break;
}