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

From: tip-bot for Frederic Weisbecker
Date: Wed Jul 31 2013 - 04:57:32 EST

Commit-ID: ba8a75c16e292c0a3a87406a77508cbbc6cf4ee2
Gitweb: http://git.kernel.org/tip/ba8a75c16e292c0a3a87406a77508cbbc6cf4ee2
Author: Frederic Weisbecker <fweisbec@xxxxxxxxx>
AuthorDate: Tue, 23 Jul 2013 02:31:04 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
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@xxxxxxxxxxxxx>
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1374539466-4799-7-git-send-email-fweisbec@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
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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