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perf record: Introduce --control fd:ctl-fd[,ack-fd] options

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Introduce --control fd:ctl-fd[,ack-fd] options to pass open file
descriptors numbers from command line.

Extend perf-record.txt file with --control fd:ctl-fd[,ack-fd] options
description.

Document possible usage model introduced by --control fd:ctl-fd[,ack-fd]
options by providing example bash shell script.

Signed-off-by: Alexey Budankov <alexey.budankov@linux.intel.com>
Acked-by: Jiri Olsa <jolsa@redhat.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/8dc01e1a-3a80-3f67-5385-4bc7112b0dd3@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Alexey Budankov
2020-07-17 10:08:23 +03:00
committed by Arnaldo Carvalho de Melo
parent acce022394
commit 1d078ccb33
3 changed files with 78 additions and 0 deletions
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37
tools/perf/builtin-record.c
View File

@@ -1786,6 +1786,9 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
perf_evlist__start_workload(rec->evlist);
}
if (evlist__initialize_ctlfd(rec->evlist, opts->ctl_fd, opts->ctl_fd_ack))
goto out_child;
if (opts->initial_delay) {
pr_info(EVLIST_DISABLED_MSG);
if (opts->initial_delay > 0) {
@@ -1932,6 +1935,7 @@ static int __cmd_record(struct record *rec, int argc, const char **argv)
record__synthesize_workload(rec, true);
out_child:
evlist__finalize_ctlfd(rec->evlist);
record__mmap_read_all(rec, true);
record__aio_mmap_read_sync(rec);
@@ -2281,6 +2285,33 @@ out_free:
return ret;
}
static int parse_control_option(const struct option *opt,
const char *str,
int unset __maybe_unused)
{
char *comma = NULL, *endptr = NULL;
struct record_opts *config = (struct record_opts *)opt->value;
if (strncmp(str, "fd:", 3))
return -EINVAL;
config->ctl_fd = strtoul(&str[3], &endptr, 0);
if (endptr == &str[3])
return -EINVAL;
comma = strchr(str, ',');
if (comma) {
if (endptr != comma)
return -EINVAL;
config->ctl_fd_ack = strtoul(comma + 1, &endptr, 0);
if (endptr == comma + 1 || *endptr != '\0')
return -EINVAL;
}
return 0;
}
static void switch_output_size_warn(struct record *rec)
{
u64 wakeup_size = evlist__mmap_size(rec->opts.mmap_pages);
@@ -2417,6 +2448,8 @@ static struct record record = {
},
.mmap_flush = MMAP_FLUSH_DEFAULT,
.nr_threads_synthesize = 1,
.ctl_fd = -1,
.ctl_fd_ack = -1,
},
.tool = {
.sample = process_sample_event,
@@ -2618,6 +2651,10 @@ static struct option __record_options[] = {
"libpfm4 event selector. use 'perf list' to list available events",
parse_libpfm_events_option),
#endif
OPT_CALLBACK(0, "control", &record.opts, "fd:ctl-fd[,ack-fd]",
"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.",
parse_control_option),
OPT_END()
};