From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933745AbcLMPJu (ORCPT ); Tue, 13 Dec 2016 10:09:50 -0500 Received: from merlin.infradead.org ([205.233.59.134]:38372 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S933010AbcLMPJs (ORCPT ); Tue, 13 Dec 2016 10:09:48 -0500 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: linux-kernel@vger.kernel.org, Namhyung Kim , Andi Kleen , Jiri Olsa , Minchan Kim , Peter Zijlstra , Arnaldo Carvalho de Melo Subject: [PATCH 04/22] perf sched timehist: Save callchain when entering idle Date: Tue, 13 Dec 2016 12:09:10 -0300 Message-Id: <20161213150928.13144-5-acme@kernel.org> X-Mailer: git-send-email 2.9.3 In-Reply-To: <20161213150928.13144-1-acme@kernel.org> References: <20161213150928.13144-1-acme@kernel.org> X-SRS-Rewrite: SMTP reverse-path rewritten from by merlin.infradead.org. See http://www.infradead.org/rpr.html Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Namhyung Kim In order to investigate the idleness reason, it is necessary to keep the callchains when entering idle. This can be identified by the sched:sched_switch event having the next_pid field as 0. Signed-off-by: Namhyung Kim Acked-by: David Ahern Cc: Andi Kleen Cc: Jiri Olsa Cc: Minchan Kim Cc: Peter Zijlstra Link: http://lkml.kernel.org/r/20161208144755.16673-4-namhyung@kernel.org Link: http://lkml.kernel.org/r/20161213080632.19099-1-namhyung@kernel.org [ Merged fix from Namhyung, see second Link: tag ] Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/builtin-sched.c | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c index e108b0f6a246..dc83b803ca54 100644 --- a/tools/perf/builtin-sched.c +++ b/tools/perf/builtin-sched.c @@ -200,6 +200,7 @@ struct perf_sched { /* options for timehist command */ bool summary; bool summary_only; + bool idle_hist; bool show_callchain; unsigned int max_stack; bool show_cpu_visual; @@ -2101,6 +2102,15 @@ static struct thread *get_idle_thread(int cpu) return idle_threads[cpu]; } +static void save_idle_callchain(struct idle_thread_runtime *itr, + struct perf_sample *sample) +{ + if (!symbol_conf.use_callchain || sample->callchain == NULL) + return; + + callchain_cursor__copy(&itr->cursor, &callchain_cursor); +} + /* * handle runtime stats saved per thread */ @@ -2154,6 +2164,26 @@ static struct thread *timehist_get_thread(struct perf_sched *sched, } save_task_callchain(sched, sample, evsel, machine); + if (sched->idle_hist) { + struct thread *idle; + struct idle_thread_runtime *itr; + + idle = get_idle_thread(sample->cpu); + if (idle == NULL) { + pr_err("Failed to get idle thread for cpu %d.\n", sample->cpu); + return NULL; + } + + itr = thread__priv(idle); + if (itr == NULL) + return NULL; + + itr->last_thread = thread; + + /* copy task callchain when entering to idle */ + if (perf_evsel__intval(evsel, sample, "next_pid") == 0) + save_idle_callchain(itr, sample); + } } return thread; -- 2.9.3