linux-kernel - [tip:perf/core] perf: Account freq events per cpu

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Date:	Wed, 31 Jul 2013 01:56:48 -0700
From:	tip-bot for Frederic Weisbecker <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, eranian@...gle.com, acme@...hat.com,
	hpa@...or.com, mingo@...nel.org, peterz@...radead.org,
	namhyung@...nel.org, jolsa@...hat.com, fweisbec@...il.com,
	tglx@...utronix.de
Subject: [tip:perf/core] perf: Account freq events per cpu

Commit-ID:  ba8a75c16e292c0a3a87406a77508cbbc6cf4ee2
Gitweb:     http://git.kernel.org/tip/ba8a75c16e292c0a3a87406a77508cbbc6cf4ee2
Author:     Frederic Weisbecker <fweisbec@...il.com>
AuthorDate: Tue, 23 Jul 2013 02:31:04 +0200
Committer:  Ingo Molnar <mingo@...nel.org>
CommitDate: Tue, 30 Jul 2013 22:29:14 +0200

perf: Account freq events per cpu

This is going to be used by the full dynticks subsystem
as a finer-grained information to know when to keep and
when to stop the tick.

Original-patch-by: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Stephane Eranian <eranian@...gle.com>
Signed-off-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/r/1374539466-4799-7-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@...nel.org>
---
 kernel/events/core.c | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 63bdec9..3fe385a 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -141,6 +141,7 @@ enum event_type_t {
 struct static_key_deferred perf_sched_events __read_mostly;
 static DEFINE_PER_CPU(atomic_t, perf_cgroup_events);
 static DEFINE_PER_CPU(atomic_t, perf_branch_stack_events);
+static DEFINE_PER_CPU(atomic_t, perf_freq_events);
 
 static atomic_t nr_mmap_events __read_mostly;
 static atomic_t nr_comm_events __read_mostly;
@@ -3139,6 +3140,9 @@ static void unaccount_event_cpu(struct perf_event *event, int cpu)
 	}
 	if (is_cgroup_event(event))
 		atomic_dec(&per_cpu(perf_cgroup_events, cpu));
+
+	if (event->attr.freq)
+		atomic_dec(&per_cpu(perf_freq_events, cpu));
 }
 
 static void unaccount_event(struct perf_event *event)
@@ -6474,6 +6478,9 @@ static void account_event_cpu(struct perf_event *event, int cpu)
 	}
 	if (is_cgroup_event(event))
 		atomic_inc(&per_cpu(perf_cgroup_events, cpu));
+
+	if (event->attr.freq)
+		atomic_inc(&per_cpu(perf_freq_events, cpu));
 }
 
 static void account_event(struct perf_event *event)
--
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