lkml.org 
[lkml]   [2009]   [Nov]   [23]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH 5/8] perf: fix __perf_event_exit_task update_event_times locking
Move the update_event_times() call in __perf_event_exit_task() into
list_del_event() because that holds the proper lock (ctx->lock) and
seems a more natural place to do the last time update.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
---
kernel/perf_event.c | 78 ++++++++++++++++++++++++++--------------------------
1 file changed, 39 insertions(+), 39 deletions(-)
Index: linux-2.6/kernel/perf_event.c
===================================================================
--- linux-2.6.orig/kernel/perf_event.c
+++ linux-2.6/kernel/perf_event.c
@@ -246,6 +246,44 @@ static void perf_unpin_context(struct pe
put_ctx(ctx);
}

+static inline u64 perf_clock(void)
+{
+ return cpu_clock(smp_processor_id());
+}
+
+/*
+ * Update the record of the current time in a context.
+ */
+static void update_context_time(struct perf_event_context *ctx)
+{
+ u64 now = perf_clock();
+
+ ctx->time += now - ctx->timestamp;
+ ctx->timestamp = now;
+}
+
+/*
+ * Update the total_time_enabled and total_time_running fields for a event.
+ */
+static void update_event_times(struct perf_event *event)
+{
+ struct perf_event_context *ctx = event->ctx;
+ u64 run_end;
+
+ if (event->state < PERF_EVENT_STATE_INACTIVE ||
+ event->group_leader->state < PERF_EVENT_STATE_INACTIVE)
+ return;
+
+ event->total_time_enabled = ctx->time - event->tstamp_enabled;
+
+ if (event->state == PERF_EVENT_STATE_INACTIVE)
+ run_end = event->tstamp_stopped;
+ else
+ run_end = ctx->time;
+
+ event->total_time_running = run_end - event->tstamp_running;
+}
+
/*
* Add a event from the lists for its context.
* Must be called with ctx->mutex and ctx->lock held.
@@ -294,6 +332,7 @@ list_del_event(struct perf_event *event,
if (event->group_leader != event)
event->group_leader->nr_siblings--;

+ update_event_times(event);
event->state = PERF_EVENT_STATE_OFF;

/*
@@ -454,44 +493,6 @@ retry:
spin_unlock_irq(&ctx->lock);
}

-static inline u64 perf_clock(void)
-{
- return cpu_clock(smp_processor_id());
-}
-
-/*
- * Update the record of the current time in a context.
- */
-static void update_context_time(struct perf_event_context *ctx)
-{
- u64 now = perf_clock();
-
- ctx->time += now - ctx->timestamp;
- ctx->timestamp = now;
-}
-
-/*
- * Update the total_time_enabled and total_time_running fields for a event.
- */
-static void update_event_times(struct perf_event *event)
-{
- struct perf_event_context *ctx = event->ctx;
- u64 run_end;
-
- if (event->state < PERF_EVENT_STATE_INACTIVE ||
- event->group_leader->state < PERF_EVENT_STATE_INACTIVE)
- return;
-
- event->total_time_enabled = ctx->time - event->tstamp_enabled;
-
- if (event->state == PERF_EVENT_STATE_INACTIVE)
- run_end = event->tstamp_stopped;
- else
- run_end = ctx->time;
-
- event->total_time_running = run_end - event->tstamp_running;
-}
-
/*
* Update total_time_enabled and total_time_running for all events in a group.
*/
@@ -4931,7 +4932,6 @@ __perf_event_exit_task(struct perf_event
{
struct perf_event *parent_event;

- update_event_times(child_event);
perf_event_remove_from_context(child_event);

parent_event = child_event->parent;
--



\
 
 \ /
  Last update: 2009-11-23 11:43    [from the cache]
©2003-2011 Jasper Spaans