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Date: Mon, 23 May 2022 09:50:37 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Jiri Olsa <jolsa@...nel.org>, Ingo Molnar <mingo@...nel.org>,
Peter Zijlstra <peterz@...radead.org>,
LKML <linux-kernel@...r.kernel.org>,
Ian Rogers <irogers@...gle.com>,
linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 2/2] perf lock: Add -t/--thread option for report
Em Fri, May 20, 2022 at 06:08:11PM -0700, Namhyung Kim escreveu:
> The -t option is to show per-thread lock stat like below:
>
> $ perf lock report -t -F acquired,contended,avg_wait
>
> Name acquired contended avg wait (ns)
>
> perf 240569 9 5784
> swapper 106610 19 543
> :15789 17370 2 14538
> ContainerMgr 8981 6 874
> sleep 5275 1 11281
> ContainerThread 4416 4 944
> RootPressureThr 3215 5 1215
> rcu_preempt 2954 0 0
> ContainerMgr 2560 0 0
> unnamed 1873 0 0
> EventManager_De 1845 1 636
> futex-default-S 1609 0 0
> ...
Applied both and added this:
⬢[acme@...lbox perf]$ git diff
diff --git a/tools/perf/Documentation/perf-lock.txt b/tools/perf/Documentation/perf-lock.txt
index b43222229807672c..656b537b2fba078f 100644
--- a/tools/perf/Documentation/perf-lock.txt
+++ b/tools/perf/Documentation/perf-lock.txt
@@ -64,6 +64,27 @@ REPORT OPTIONS
--combine-locks::
Merge lock instances in the same class (based on name).
+-t::
+--threads::
+ The -t option is to show per-thread lock stat like below:
+
+ $ perf lock report -t -F acquired,contended,avg_wait
+
+ Name acquired contended avg wait (ns)
+
+ perf 240569 9 5784
+ swapper 106610 19 543
+ :15789 17370 2 14538
+ ContainerMgr 8981 6 874
+ sleep 5275 1 11281
+ ContainerThread 4416 4 944
+ RootPressureThr 3215 5 1215
+ rcu_preempt 2954 0 0
+ ContainerMgr 2560 0 0
+ unnamed 1873 0 0
+ EventManager_De 1845 1 636
+ futex-default-S 1609 0 0
+
INFO OPTIONS
------------
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
> tools/perf/builtin-lock.c | 28 +++++++++++++++++++++++++++-
> 1 file changed, 27 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c
> index 7ceb12e30719..b1200b7340a6 100644
> --- a/tools/perf/builtin-lock.c
> +++ b/tools/perf/builtin-lock.c
> @@ -118,6 +118,7 @@ struct thread_stat {
> static struct rb_root thread_stats;
>
> static bool combine_locks;
> +static bool show_thread_stats;
>
> static struct thread_stat *thread_stat_find(u32 tid)
> {
> @@ -542,6 +543,10 @@ static int report_lock_acquire_event(struct evsel *evsel,
> u64 addr = evsel__intval(evsel, sample, "lockdep_addr");
> int flag = evsel__intval(evsel, sample, "flags");
>
> + /* abuse ls->addr for tid */
> + if (show_thread_stats)
> + addr = sample->tid;
> +
> ls = lock_stat_findnew(addr, name);
> if (!ls)
> return -ENOMEM;
> @@ -611,6 +616,9 @@ static int report_lock_acquired_event(struct evsel *evsel,
> const char *name = evsel__strval(evsel, sample, "name");
> u64 addr = evsel__intval(evsel, sample, "lockdep_addr");
>
> + if (show_thread_stats)
> + addr = sample->tid;
> +
> ls = lock_stat_findnew(addr, name);
> if (!ls)
> return -ENOMEM;
> @@ -670,6 +678,9 @@ static int report_lock_contended_event(struct evsel *evsel,
> const char *name = evsel__strval(evsel, sample, "name");
> u64 addr = evsel__intval(evsel, sample, "lockdep_addr");
>
> + if (show_thread_stats)
> + addr = sample->tid;
> +
> ls = lock_stat_findnew(addr, name);
> if (!ls)
> return -ENOMEM;
> @@ -722,6 +733,9 @@ static int report_lock_release_event(struct evsel *evsel,
> const char *name = evsel__strval(evsel, sample, "name");
> u64 addr = evsel__intval(evsel, sample, "lockdep_addr");
>
> + if (show_thread_stats)
> + addr = sample->tid;
> +
> ls = lock_stat_findnew(addr, name);
> if (!ls)
> return -ENOMEM;
> @@ -848,7 +862,17 @@ static void print_result(void)
>
> if (strlen(st->name) < 20) {
> /* output raw name */
> - pr_info("%20s ", st->name);
> + const char *name = st->name;
> +
> + if (show_thread_stats) {
> + struct thread *t;
> +
> + /* st->addr contains tid of thread */
> + t = perf_session__findnew(session, st->addr);
> + name = thread__comm_str(t);
> + }
> +
> + pr_info("%20s ", name);
> } else {
> strncpy(cut_name, st->name, 16);
> cut_name[16] = '.';
> @@ -1125,6 +1149,8 @@ int cmd_lock(int argc, const char **argv)
> /* TODO: type */
> OPT_BOOLEAN('c', "combine-locks", &combine_locks,
> "combine locks in the same class"),
> + OPT_BOOLEAN('t', "threads", &show_thread_stats,
> + "show per-thread lock stats"),
> OPT_PARENT(lock_options)
> };
>
> --
> 2.36.1.124.g0e6072fb45-goog
--
- Arnaldo
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