perfcounters: pull inherited counters
Change counter inheritance from a 'push' to a 'pull' model: instead of
child tasks pushing their final counts to the parent, reuse the wait4
infrastructure to pull counters as child tasks are exit-processed,
much like how cutime/cstime is collected.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index 23fd890..54fa2fa 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -113,6 +113,14 @@
# define CAP_INIT_BSET CAP_INIT_EFF_SET
#endif
+#ifdef CONFIG_PERF_COUNTERS
+# define INIT_PERF_COUNTERS(tsk) \
+ .perf_counter_ctx.counter_list = \
+ LIST_HEAD_INIT(tsk.perf_counter_ctx.counter_list),
+#else
+# define INIT_PERF_COUNTERS(tsk)
+#endif
+
/*
* INIT_TASK is used to set up the first task table, touch at
* your own risk!. Base=0, limit=0x1fffff (=2MB)
@@ -180,6 +188,7 @@
INIT_IDS \
INIT_TRACE_IRQFLAGS \
INIT_LOCKDEP \
+ INIT_PERF_COUNTERS(tsk) \
}