Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751826Ab3IICTr (ORCPT ); Sun, 8 Sep 2013 22:19:47 -0400 Received: from g5t0009.atlanta.hp.com ([15.192.0.46]:25647 "EHLO g5t0009.atlanta.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751718Ab3IICTj (ORCPT ); Sun, 8 Sep 2013 22:19:39 -0400 From: Davidlohr Bueso To: Arnaldo Carvalho de Melo , Frederic Weisbecker Cc: Ingo Molnar , Peter Zijlstra , Hitoshi Mitake , Aswin Chandramouleeswaran , linux-kernel@vger.kernel.org, Davidlohr Bueso Subject: [PATCH 7/7] perf lock: account for lock average wait time Date: Sun, 8 Sep 2013 19:19:19 -0700 Message-Id: <1378693159-8747-8-git-send-email-davidlohr@hp.com> X-Mailer: git-send-email 1.7.11.7 In-Reply-To: <1378693159-8747-1-git-send-email-davidlohr@hp.com> References: <1378693159-8747-1-git-send-email-davidlohr@hp.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3880 Lines: 107 While perf-lock currently reports both the total wait time and the number of contentions, it doesn't explicitly show the average wait time. Having this value immediately in the report can be quite useful when looking into performance issues. Furthermore, allowing report to sort by averages is another handy feature to have - and thus do not only print the value, but add it to the lock_stat structure. Signed-off-by: Davidlohr Bueso --- tools/perf/Documentation/perf-lock.txt | 2 +- tools/perf/builtin-lock.c | 10 +++++++++- 2 files changed, 10 insertions(+), 2 deletions(-) diff --git a/tools/perf/Documentation/perf-lock.txt b/tools/perf/Documentation/perf-lock.txt index c7f5f55..ab25be2 100644 --- a/tools/perf/Documentation/perf-lock.txt +++ b/tools/perf/Documentation/perf-lock.txt @@ -48,7 +48,7 @@ REPORT OPTIONS -k:: --key=:: Sorting key. Possible values: acquired (default), contended, - wait_total, wait_max, wait_min. + avg_wait, wait_total, wait_max, wait_min. INFO OPTIONS ------------ diff --git a/tools/perf/builtin-lock.c b/tools/perf/builtin-lock.c index 5adebe6..f0a5871 100644 --- a/tools/perf/builtin-lock.c +++ b/tools/perf/builtin-lock.c @@ -56,7 +56,9 @@ struct lock_stat { unsigned int nr_readlock; unsigned int nr_trylock; + /* these times are in nano sec. */ + u64 avg_wait_time; u64 wait_time_total; u64 wait_time_min; u64 wait_time_max; @@ -208,6 +210,7 @@ static struct thread_stat *thread_stat_findnew_first(u32 tid) SINGLE_KEY(nr_acquired) SINGLE_KEY(nr_contended) +SINGLE_KEY(avg_wait_time) SINGLE_KEY(wait_time_total) SINGLE_KEY(wait_time_max) @@ -244,6 +247,7 @@ static struct rb_root result; /* place to store sorted data */ struct lock_key keys[] = { DEF_KEY_LOCK(acquired, nr_acquired), DEF_KEY_LOCK(contended, nr_contended), + DEF_KEY_LOCK(avg_wait, avg_wait_time), DEF_KEY_LOCK(wait_total, wait_time_total), DEF_KEY_LOCK(wait_min, wait_time_min), DEF_KEY_LOCK(wait_max, wait_time_max), @@ -516,6 +520,7 @@ static int report_lock_acquired_event(struct perf_evsel *evsel, seq->state = SEQ_STATE_ACQUIRED; ls->nr_acquired++; + ls->avg_wait_time = ls->nr_contended ? ls->wait_time_total/ls->nr_contended : 0; seq->prev_event_time = sample->time; end: return 0; @@ -570,6 +575,7 @@ static int report_lock_contended_event(struct perf_evsel *evsel, seq->state = SEQ_STATE_CONTENDED; ls->nr_contended++; + ls->avg_wait_time = ls->wait_time_total/ls->nr_contended; seq->prev_event_time = sample->time; end: return 0; @@ -702,6 +708,7 @@ static void print_result(void) pr_info("%10s ", "acquired"); pr_info("%10s ", "contended"); + pr_info("%15s ", "avg wait (ns)"); pr_info("%15s ", "total wait (ns)"); pr_info("%15s ", "max wait (ns)"); pr_info("%15s ", "min wait (ns)"); @@ -720,6 +727,7 @@ static void print_result(void) pr_info("%10u ", st->nr_acquired); pr_info("%10u ", st->nr_contended); + pr_info("%15" PRIu64 " ", st->avg_wait_time); pr_info("%15" PRIu64 " ", st->wait_time_total); pr_info("%15" PRIu64 " ", st->wait_time_max); pr_info("%15" PRIu64 " ", st->wait_time_min == ULLONG_MAX ? @@ -926,7 +934,7 @@ int cmd_lock(int argc, const char **argv, const char *prefix __maybe_unused) }; const struct option report_options[] = { OPT_STRING('k', "key", &sort_key, "acquired", - "key for sorting (acquired / contended / wait_total / wait_max / wait_min)"), + "key for sorting (acquired / contended / avg_wait / wait_total / wait_max / wait_min)"), /* TODO: type */ OPT_END() }; -- 1.7.11.7 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/