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authorLinus Torvalds <torvalds@linux-foundation.org>2009-08-19 09:43:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-08-19 09:43:19 -0700
commitd46c7d9ab8289f23a5e161060b84fd7e63de7921 (patch)
tree347f049f3c3c9dcd0c8e9edd459d7d6b9bbacfaf /kernel
parentc124891f50f11e33acdfa276864ea089bab726b6 (diff)
parentb395cd8a74b4a8d943dd4b5585e676f62f7350b3 (diff)
Merge branch 'perfcounters-fixes-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'perfcounters-fixes-for-linus-2' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: perf tools: Make 'make html' work perf annotate: Fix segmentation fault perf_counter: Fix the PARISC build perf_counter: Check task on counter read IPI perf: Rename perf-examples.txt to examples.txt perf record: Fix typo in pid_synthesize_comm_event
Diffstat (limited to 'kernel')
-rw-r--r--kernel/perf_counter.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
index 534e20d14d6..36f65e2b8b5 100644
--- a/kernel/perf_counter.c
+++ b/kernel/perf_counter.c
@@ -1503,10 +1503,21 @@ static void perf_counter_enable_on_exec(struct task_struct *task)
*/
static void __perf_counter_read(void *info)
{
+ struct perf_cpu_context *cpuctx = &__get_cpu_var(perf_cpu_context);
struct perf_counter *counter = info;
struct perf_counter_context *ctx = counter->ctx;
unsigned long flags;
+ /*
+ * If this is a task context, we need to check whether it is
+ * the current task context of this cpu. If not it has been
+ * scheduled out before the smp call arrived. In that case
+ * counter->count would have been updated to a recent sample
+ * when the counter was scheduled out.
+ */
+ if (ctx->task && cpuctx->task_ctx != ctx)
+ return;
+
local_irq_save(flags);
if (ctx->is_active)
update_context_time(ctx);
@@ -2008,6 +2019,10 @@ int perf_counter_task_disable(void)
return 0;
}
+#ifndef PERF_COUNTER_INDEX_OFFSET
+# define PERF_COUNTER_INDEX_OFFSET 0
+#endif
+
static int perf_counter_index(struct perf_counter *counter)
{
if (counter->state != PERF_COUNTER_STATE_ACTIVE)