perfcounters: fix refcounting bug

don't kfree in use counters. Running... while true; do perfstat -e 1 -c true; done ...on all cores for a while doesn't seem to be eating ram, and my oops is gone. Signed-off-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
git-mirror · Jan 29, 2009 · 65d3708 · 65d3708
1 parent bb3f0b5
commit 65d3708
Showing 1 changed file with 2 additions and 1 deletion.
diff --git a/kernel/perf_counter.c b/kernel/perf_counter.c
@@ -1934,7 +1934,8 @@ __perf_counter_exit_task(struct task_struct *child,
 		}
 	}
 
-	kfree(child_counter);
+	if (!child_counter->filp || !atomic_long_read(&child_counter->filp->f_count))
+		kfree(child_counter);
 }
 
 /*