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| author | Jiri Olsa <jolsa@kernel.org> | 2020-12-27 00:20:38 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-01-20 14:34:21 -0300 |
| commit | 47fddcb479e73c341fb414e40a89572dacadd360 (patch) | |
| tree | 6a968b553d33efc8b1abb4b1814650a23c46f365 /tools/perf/util/evlist.h | |
| parent | f186cd614878dc886edea5df42ca3225d5ab97ea (diff) | |
| download | linux-stable-47fddcb479e73c341fb414e40a89572dacadd360.tar.gz linux-stable-47fddcb479e73c341fb414e40a89572dacadd360.tar.bz2 linux-stable-47fddcb479e73c341fb414e40a89572dacadd360.zip | |
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/util/evlist.h')
| -rw-r--r-- | tools/perf/util/evlist.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h index 6f45c3630355..7c2521cb6b09 100644 --- a/tools/perf/util/evlist.h +++ b/tools/perf/util/evlist.h @@ -332,6 +332,7 @@ struct evsel *evlist__reset_weak_group(struct evlist *evlist, struct evsel *evse #define EVLIST_CTL_CMD_SNAPSHOT_TAG "snapshot" #define EVLIST_CTL_CMD_EVLIST_TAG "evlist" #define EVLIST_CTL_CMD_STOP_TAG "stop" +#define EVLIST_CTL_CMD_PING_TAG "ping" #define EVLIST_CTL_CMD_MAX_LEN 64 @@ -343,6 +344,7 @@ enum evlist_ctl_cmd { EVLIST_CTL_CMD_SNAPSHOT, EVLIST_CTL_CMD_EVLIST, EVLIST_CTL_CMD_STOP, + EVLIST_CTL_CMD_PING, }; int evlist__parse_control(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close); |