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| author | Adrian Hunter <adrian.hunter@intel.com> | 2020-09-01 11:37:57 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-09-04 19:38:15 +0200 |
| commit | d20aff1512f013fab79b8740427b7574569a9a2e (patch) | |
| tree | 43c5261c26024130049b82902d24a0972baca09d /tools/perf/util/evlist.h | |
| parent | perf tools: Add FIFO file names as alternative options to --control (diff) | |
| download | linux-d20aff1512f013fab79b8740427b7574569a9a2e.tar.xz linux-d20aff1512f013fab79b8740427b7574569a9a2e.zip | |
perf record: Add 'snapshot' control command
Add 'snapshot' control command to create an AUX area tracing snapshot
the same as if sending SIGUSR2. The advantage of the FIFO is that access
is governed by access to the FIFO.
Example:
$ mkfifo perf.control
$ mkfifo perf.ack
$ cat perf.ack &
[1] 15235
$ sudo ~/bin/perf record --control fifo:perf.control,perf.ack -S -e intel_pt//u -- sleep 60 &
[2] 15243
$ ps -e | grep perf
15244 pts/1 00:00:00 perf
$ kill -USR2 15244
bash: kill: (15244) - Operation not permitted
$ echo snapshot > perf.control
ack
$
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: http://lore.kernel.org/lkml/20200901093758.32293-6-adrian.hunter@intel.com
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 | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h index a5678eb5ee60..91d1da6e1fe3 100644 --- a/tools/perf/util/evlist.h +++ b/tools/perf/util/evlist.h @@ -363,6 +363,7 @@ struct evsel *perf_evlist__reset_weak_group(struct evlist *evlist, #define EVLIST_CTL_CMD_ENABLE_TAG "enable" #define EVLIST_CTL_CMD_DISABLE_TAG "disable" #define EVLIST_CTL_CMD_ACK_TAG "ack\n" +#define EVLIST_CTL_CMD_SNAPSHOT_TAG "snapshot" #define EVLIST_CTL_CMD_MAX_LEN 64 @@ -370,7 +371,8 @@ enum evlist_ctl_cmd { EVLIST_CTL_CMD_UNSUPPORTED = 0, EVLIST_CTL_CMD_ENABLE, EVLIST_CTL_CMD_DISABLE, - EVLIST_CTL_CMD_ACK + EVLIST_CTL_CMD_ACK, + EVLIST_CTL_CMD_SNAPSHOT, }; int evlist__parse_control(const char *str, int *ctl_fd, int *ctl_fd_ack, bool *ctl_fd_close); @@ -378,6 +380,7 @@ int evlist__initialize_ctlfd(struct evlist *evlist, int ctl_fd, int ctl_fd_ack); int evlist__finalize_ctlfd(struct evlist *evlist); bool evlist__ctlfd_initialized(struct evlist *evlist); int evlist__ctlfd_process(struct evlist *evlist, enum evlist_ctl_cmd *cmd); +int evlist__ctlfd_ack(struct evlist *evlist); #define EVLIST_ENABLED_MSG "Events enabled\n" #define EVLIST_DISABLED_MSG "Events disabled\n" |