Commit-ID: 766d6c076928191d75ad5b0d0f58f52b1e7682d8
Gitweb: http://git.kernel.org/tip/766d6c076928191d75ad5b0d0f58f52b1e7682d8
Author: Frederic Weisbecker <fweisbec@xxxxxxxxx>
AuthorDate: Tue, 23 Jul 2013 02:31:01 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 30 Jul 2013 22:29:12 +0200
perf: Factor out event accounting code to account_event()/__free_event()
Gather all the event accounting code to a single place,
once all the prerequisites are completed. This simplifies
the refcounting.
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/1374539466-4799-4-git-send-email-fweisbec@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/events/core.c | 79 +++++++++++++++++++++++++++++++---------------------
1 file changed, 47 insertions(+), 32 deletions(-)
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 3b99862..158fd57 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -3128,6 +3128,21 @@ 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 __free_event(struct perf_event *event)
+{
+ if (!event->parent) {
+ if (event->attr.sample_type & PERF_SAMPLE_CALLCHAIN)
+ put_callchain_buffers();
+ }
+
+ if (event->destroy)
+ event->destroy(event);
+
+ if (event->ctx)
+ put_ctx(event->ctx);
+
+ call_rcu(&event->rcu_head, free_event_rcu);
+}
static void free_event(struct perf_event *event)
{
irq_work_sync(&event->pending);
@@ -3141,8 +3156,6 @@ static void free_event(struct perf_event *event)
atomic_dec(&nr_comm_events);
if (event->attr.task)
atomic_dec(&nr_task_events);
- if (event->attr.sample_type & PERF_SAMPLE_CALLCHAIN)
- put_callchain_buffers();
if (is_cgroup_event(event)) {
atomic_dec(&per_cpu(perf_cgroup_events, event->cpu));
static_key_slow_dec_deferred(&perf_sched_events);
@@ -3180,13 +3193,8 @@ static void free_event(struct perf_event *event)
if (is_cgroup_event(event))
perf_detach_cgroup(event);
- if (event->destroy)
- event->destroy(event);
-
- if (event->ctx)
- put_ctx(event->ctx);
- call_rcu(&event->rcu_head, free_event_rcu);
+ __free_event(event);
}
int perf_event_release_kernel(struct perf_event *event)
@@ -6443,6 +6451,29 @@ unlock:
return pmu;
}
+static void account_event(struct perf_event *event)
+{
+ if (event->attach_state & PERF_ATTACH_TASK)
+ static_key_slow_inc(&perf_sched_events.key);
+ if (event->attr.mmap || event->attr.mmap_data)
+ atomic_inc(&nr_mmap_events);
+ if (event->attr.comm)
+ atomic_inc(&nr_comm_events);
+ if (event->attr.task)
+ atomic_inc(&nr_task_events);
+ 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));
+ static_key_slow_inc(&perf_sched_events.key);
+ }
+}
+
/*
* Allocate and initialize a event structure
*/
@@ -6556,21 +6587,6 @@ perf_event_alloc(struct perf_event_attr *attr, int cpu,
if (err)
goto err_pmu;
}
-
- if (event->attach_state & PERF_ATTACH_TASK)
- static_key_slow_inc(&perf_sched_events.key);
- if (event->attr.mmap || event->attr.mmap_data)
- atomic_inc(&nr_mmap_events);
- if (event->attr.comm)
- atomic_inc(&nr_comm_events);
- if (event->attr.task)
- atomic_inc(&nr_task_events);
- 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));
- }
}
return event;
@@ -6865,17 +6881,14 @@ SYSCALL_DEFINE5(perf_event_open,
if (flags & PERF_FLAG_PID_CGROUP) {
err = perf_cgroup_connect(pid, event, &attr, group_leader);
- if (err)
- goto err_alloc;
- /*
- * one more event:
- * - that has cgroup constraint on event->cpu
- * - that may need work on context switch
- */
- atomic_inc(&per_cpu(perf_cgroup_events, event->cpu));
- static_key_slow_inc(&perf_sched_events.key);
+ if (err) {
+ __free_event(event);
+ goto err_task;
+ }
}
+ account_event(event);
+
/*
* Special case software events and allow them to be part of
* any hardware group.
@@ -7071,6 +7084,8 @@ perf_event_create_kernel_counter(struct perf_event_attr *attr, int cpu,
goto err;
}
+ account_event(event);
+
ctx = find_get_context(event->pmu, task, cpu);
if (IS_ERR(ctx)) {
err = PTR_ERR(ctx);
--
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