Messages in this thread Patch in this message | | | From | Namhyung Kim <> | Subject | [PATCH 2/5] perf lock: Add lock contention tracepoints record support | Date | Fri, 3 Jun 2022 16:56:53 -0700 |
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When LOCKDEP and LOCK_STAT events are not available, it falls back to record the new lock contention tracepoints.
Signed-off-by: Namhyung Kim <namhyung@kernel.org> --- tools/perf/builtin-lock.c | 74 +++++++++++++++++++++++++++++++++++---- 1 file changed, 67 insertions(+), 7 deletions(-)
diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c index 57e396323d05..60a45973744d 100644 --- a/tools/perf/builtin-lock.c +++ b/tools/perf/builtin-lock.c @@ -516,17 +516,27 @@ static struct lock_stat *lock_stat_findnew(u64 addr, const char *name) } struct trace_lock_handler { + /* it's used on CONFIG_LOCKDEP */ int (*acquire_event)(struct evsel *evsel, struct perf_sample *sample); + /* it's used on CONFIG_LOCK_STAT */ int (*acquired_event)(struct evsel *evsel, struct perf_sample *sample); + /* it's used on CONFIG_LOCK_STAT */ int (*contended_event)(struct evsel *evsel, struct perf_sample *sample); + /* it's used on CONFIG_LOCKDEP */ int (*release_event)(struct evsel *evsel, struct perf_sample *sample); + + int (*contention_begin_event)(struct evsel *evsel, + struct perf_sample *sample); + + int (*contention_end_event)(struct evsel *evsel, + struct perf_sample *sample); }; static struct lock_seq_stat *get_seq(struct thread_stat *ts, u64 addr) @@ -854,6 +864,20 @@ static int evsel__process_lock_release(struct evsel *evsel, struct perf_sample * return 0; } +static int evsel__process_contention_begin(struct evsel *evsel, struct perf_sample *sample) +{ + if (trace_handler->contention_begin_event) + return trace_handler->contention_begin_event(evsel, sample); + return 0; +} + +static int evsel__process_contention_end(struct evsel *evsel, struct perf_sample *sample) +{ + if (trace_handler->contention_end_event) + return trace_handler->contention_end_event(evsel, sample); + return 0; +} + static void print_bad_events(int bad, int total) { /* Output for debug, this have to be removed */ @@ -1055,6 +1079,11 @@ static const struct evsel_str_handler lock_tracepoints[] = { { "lock:lock_release", evsel__process_lock_release, }, /* CONFIG_LOCKDEP */ }; +static const struct evsel_str_handler contention_tracepoints[] = { + { "lock:contention_begin", evsel__process_contention_begin, }, + { "lock:contention_end", evsel__process_contention_end, }, +}; + static bool force; static int __cmd_report(bool display_info) @@ -1118,20 +1147,41 @@ static int __cmd_record(int argc, const char **argv) "record", "-R", "-m", "1024", "-c", "1", "--synth", "task", }; unsigned int rec_argc, i, j, ret; + unsigned int nr_tracepoints; const char **rec_argv; + bool has_lock_stat = true; for (i = 0; i < ARRAY_SIZE(lock_tracepoints); i++) { if (!is_valid_tracepoint(lock_tracepoints[i].name)) { - pr_err("tracepoint %s is not enabled. " - "Are CONFIG_LOCKDEP and CONFIG_LOCK_STAT enabled?\n", - lock_tracepoints[i].name); - return 1; + pr_debug("tracepoint %s is not enabled. " + "Are CONFIG_LOCKDEP and CONFIG_LOCK_STAT enabled?\n", + lock_tracepoints[i].name); + has_lock_stat = false; + break; + } + } + + if (has_lock_stat) + goto setup_args; + + for (i = 0; i < ARRAY_SIZE(contention_tracepoints); i++) { + if (!is_valid_tracepoint(contention_tracepoints[i].name)) { + pr_err("tracepoint %s is not enabled.\n", + contention_tracepoints[i].name); + return 1; } } +setup_args: rec_argc = ARRAY_SIZE(record_args) + argc - 1; + + if (has_lock_stat) + nr_tracepoints = ARRAY_SIZE(lock_tracepoints); + else + nr_tracepoints = ARRAY_SIZE(contention_tracepoints); + /* factor of 2 is for -e in front of each tracepoint */ - rec_argc += 2 * ARRAY_SIZE(lock_tracepoints); + rec_argc += 2 * nr_tracepoints; rec_argv = calloc(rec_argc + 1, sizeof(char *)); if (!rec_argv) @@ -1140,9 +1190,19 @@ static int __cmd_record(int argc, const char **argv) for (i = 0; i < ARRAY_SIZE(record_args); i++) rec_argv[i] = strdup(record_args[i]); - for (j = 0; j < ARRAY_SIZE(lock_tracepoints); j++) { + for (j = 0; j < nr_tracepoints; j++) { + const char *ev_name; + + if (has_lock_stat) + ev_name = strdup(lock_tracepoints[j].name); + else + ev_name = strdup(contention_tracepoints[j].name); + + if (!ev_name) + return -ENOMEM; + rec_argv[i++] = "-e"; - rec_argv[i++] = strdup(lock_tracepoints[j].name); + rec_argv[i++] = ev_name; } for (j = 1; j < (unsigned int)argc; j++, i++) -- 2.36.1.255.ge46751e96f-goog
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