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authorAdrian Hunter <adrian.hunter@intel.com>2020-09-02 13:57:07 +0300
committerArnaldo Carvalho de Melo <acme@redhat.com>2020-09-04 14:38:15 -0300
commita8fcbd269b4340c36dbf99b4453bcbfe128d93fb (patch)
treecae1fe729dd0558552f4956691a529ec21cbab94 /tools/perf/builtin-stat.c
parent1f4390d825cc04e91a276c78f984dd2d7fe01e62 (diff)
perf tools: Add FIFO file names as alternative options to --control
Enable the --control option to accept file names as an alternative to file descriptors. Example: $ mkfifo perf.control $ mkfifo perf.ack $ cat perf.ack & [1] 6808 $ perf record --control fifo:perf.control,perf.ack -- sleep 300 & [2] 6810 $ echo disable > perf.control $ Events disabled ack $ echo enable > perf.control $ Events enabled ack $ echo disable > perf.control $ Events disabled ack $ kill %2 [ perf record: Woken up 4 times to write data ] $ [ perf record: Captured and wrote 0.018 MB perf.data (7 samples) ] [1]- Done cat perf.ack [2]+ Terminated perf record --control fifo:perf.control,perf.ack -- sleep 300 $ 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/20200902105707.11491-1-adrian.hunter@intel.com 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.c18
1 files changed, 15 insertions, 3 deletions
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index ea072d47c560..14688710195c 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1047,7 +1047,17 @@ static int parse_control_option(const struct option *opt,
{
struct perf_stat_config *config = opt->value;
- return evlist__parse_control(str, &config->ctl_fd, &config->ctl_fd_ack);
+ return evlist__parse_control(str, &config->ctl_fd, &config->ctl_fd_ack, &config->ctl_fd_close);
+}
+
+static void close_control_option(struct perf_stat_config *config)
+{
+ if (config->ctl_fd_close) {
+ config->ctl_fd_close = false;
+ close(config->ctl_fd);
+ if (config->ctl_fd_ack >= 0)
+ close(config->ctl_fd_ack);
+ }
}
static struct option stat_options[] = {
@@ -1153,9 +1163,10 @@ static struct option stat_options[] = {
"libpfm4 event selector. use 'perf list' to list available events",
parse_libpfm_events_option),
#endif
- OPT_CALLBACK(0, "control", &stat_config, "fd:ctl-fd[,ack-fd]",
+ OPT_CALLBACK(0, "control", &stat_config, "fd:ctl-fd[,ack-fd] or fifo:ctl-fifo[,ack-fifo]",
"Listen on ctl-fd descriptor for command to control measurement ('enable': enable events, 'disable': disable events).\n"
- "\t\t\t Optionally send control command completion ('ack\\n') to ack-fd descriptor.",
+ "\t\t\t Optionally send control command completion ('ack\\n') to ack-fd descriptor.\n"
+ "\t\t\t Alternatively, ctl-fifo / ack-fifo will be opened and used as ctl-fd / ack-fd.",
parse_control_option),
OPT_END()
};
@@ -2398,6 +2409,7 @@ out:
metricgroup__rblist_exit(&stat_config.metric_events);
runtime_stat_delete(&stat_config);
+ close_control_option(&stat_config);
return status;
}