Commit-ID: 4beb31f3657348a8b702dd014d01c520e522012f
Gitweb: http://git.kernel.org/tip/4beb31f3657348a8b702dd014d01c520e522012f
Author: Frederic Weisbecker <fweisbec@xxxxxxxxx>
AuthorDate: Tue, 23 Jul 2013 02:31:02 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 30 Jul 2013 22:29:13 +0200
perf: Split the per-cpu accounting part of the event accounting code
This way we can use the per-cpu handling seperately.
This is going to be used by to fix the event migration
code accounting.
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/1374539466-4799-5-git-send-email-fweisbec@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/events/core.c | 87 +++++++++++++++++++++++++++++++++-------------------
1 file changed, 55 insertions(+), 32 deletions(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 158fd57..3a4b73a 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3128,6 +3128,40 @@ static void free_event_rcu(struct rcu_head *head)
static void ring_buffer_put(struct ring_buffer *rb);
static void ring_buffer_detach(struct perf_event *event, struct ring_buffer *rb);
+static void unaccount_event_cpu(struct perf_event *event, int cpu)
+{
+ if (event->parent)
+ return;
+
+ if (has_branch_stack(event)) {
+ if (!(event->attach_state & PERF_ATTACH_TASK))
+ atomic_dec(&per_cpu(perf_branch_stack_events, cpu));
+ }
+ if (is_cgroup_event(event))
+ atomic_dec(&per_cpu(perf_cgroup_events, cpu));
+}
+
+static void unaccount_event(struct perf_event *event)
+{
+ if (event->parent)
+ return;
+
+ if (event->attach_state & PERF_ATTACH_TASK)
+ static_key_slow_dec_deferred(&perf_sched_events);
+ if (event->attr.mmap || event->attr.mmap_data)
+ atomic_dec(&nr_mmap_events);
+ if (event->attr.comm)
+ atomic_dec(&nr_comm_events);
+ if (event->attr.task)
+ atomic_dec(&nr_task_events);
+ if (is_cgroup_event(event))
+ static_key_slow_dec_deferred(&perf_sched_events);
+ if (has_branch_stack(event))
+ static_key_slow_dec_deferred(&perf_sched_events);
+
+ unaccount_event_cpu(event, event->cpu);
+}
+
static void __free_event(struct perf_event *event)
{
if (!event->parent) {
@@ -3147,29 +3181,7 @@ static void free_event(struct perf_event *event)
{
irq_work_sync(&event->pending);
- if (!event->parent) {
- if (event->attach_state & PERF_ATTACH_TASK)
- static_key_slow_dec_deferred(&perf_sched_events);
- if (event->attr.mmap || event->attr.mmap_data)
- atomic_dec(&nr_mmap_events);
- if (event->attr.comm)
- atomic_dec(&nr_comm_events);
- if (event->attr.task)
- atomic_dec(&nr_task_events);
- if (is_cgroup_event(event)) {
- atomic_dec(&per_cpu(perf_cgroup_events, event->cpu));
- static_key_slow_dec_deferred(&perf_sched_events);
- }
-
- if (has_branch_stack(event)) {
- static_key_slow_dec_deferred(&perf_sched_events);
- /* is system-wide event */
- if (!(event->attach_state & PERF_ATTACH_TASK)) {
- atomic_dec(&per_cpu(perf_branch_stack_events,
- event->cpu));
- }
- }
- }
+ unaccount_event(event);
if (event->rb) {
struct ring_buffer *rb;
@@ -6451,8 +6463,24 @@ unlock:
return pmu;
}
+static void account_event_cpu(struct perf_event *event, int cpu)
+{
+ if (event->parent)
+ return;
+
+ if (has_branch_stack(event)) {
+ if (!(event->attach_state & PERF_ATTACH_TASK))
+ atomic_inc(&per_cpu(perf_branch_stack_events, cpu));
+ }
+ if (is_cgroup_event(event))
+ atomic_inc(&per_cpu(perf_cgroup_events, cpu));
+}
+
static void account_event(struct perf_event *event)
{
+ if (event->parent)
+ return;
+
if (event->attach_state & PERF_ATTACH_TASK)
static_key_slow_inc(&perf_sched_events.key);
if (event->attr.mmap || event->attr.mmap_data)
@@ -6461,17 +6489,12 @@ static void account_event(struct perf_event *event)
atomic_inc(&nr_comm_events);
if (event->attr.task)
atomic_inc(&nr_task_events);
- if (has_branch_stack(event)) {
+ if (has_branch_stack(event))
static_key_slow_inc(&perf_sched_events.key);
- if (!(event->attach_state & PERF_ATTACH_TASK))
- atomic_inc(&per_cpu(perf_branch_stack_events,
- event->cpu));
- }
-
- if (is_cgroup_event(event)) {
- atomic_inc(&per_cpu(perf_cgroup_events, event->cpu));
+ if (is_cgroup_event(event))
static_key_slow_inc(&perf_sched_events.key);
- }
+
+ account_event_cpu(event, event->cpu);
}
/*
--
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