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| author | Jiri Olsa <jolsa@kernel.org> | 2020-12-27 00:20:37 +0100 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-01-20 14:34:21 -0300 |
| commit | f186cd614878dc886edea5df42ca3225d5ab97ea (patch) | |
| tree | e6debe3d3e27007dd83dee68cdfac16ed155c1a3 /tools/perf/util/evlist.c | |
| parent | 142544a938f436a6567a88d307346bfe198465b0 (diff) | |
| download | lwn-f186cd614878dc886edea5df42ca3225d5ab97ea.tar.gz lwn-f186cd614878dc886edea5df42ca3225d5ab97ea.zip | |
perf tools: Add 'stop' control command
Adding control 'stop' command to stop perf record.
When it is received, perf will set the 'done' variable to 1 to stop its
mmap ring buffer reading loop.
Example session:
terminal 1:
# mkfifo control ack
# perf record --control=fifo:control,ack
terminal 2:
# echo stop > control
terminal 1:
[ perf record: Woken up 7 times to write data ]
[ perf record: Captured and wrote 3.214 MB perf.data (38280 samples) ]
#
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/20201226232038.390883-4-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/util/evlist.c')
| -rw-r--r-- | tools/perf/util/evlist.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/perf/util/evlist.c b/tools/perf/util/evlist.c index 9e890b482220..c6de70cefbae 100644 --- a/tools/perf/util/evlist.c +++ b/tools/perf/util/evlist.c @@ -1940,6 +1940,9 @@ static int evlist__ctlfd_recv(struct evlist *evlist, enum evlist_ctl_cmd *cmd, } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_EVLIST_TAG, (sizeof(EVLIST_CTL_CMD_EVLIST_TAG)-1))) { *cmd = EVLIST_CTL_CMD_EVLIST; + } else if (!strncmp(cmd_data, EVLIST_CTL_CMD_STOP_TAG, + (sizeof(EVLIST_CTL_CMD_STOP_TAG)-1))) { + *cmd = EVLIST_CTL_CMD_STOP; } } @@ -2077,6 +2080,7 @@ int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd) err = evlist__ctlfd_list(evlist, cmd_data); break; case EVLIST_CTL_CMD_SNAPSHOT: + case EVLIST_CTL_CMD_STOP: break; case EVLIST_CTL_CMD_ACK: case EVLIST_CTL_CMD_UNSUPPORTED: |