[PATCH] perf/core: Update cgroup time with descendants

[linxiulei]

From: "leilei.lin" <leilei.lin@xxxxxxxxxxxxxxx>

This fix updating cgroup time when event is being scheduled in
by cgroup descendants

Signed-off-by: leilei.lin <leilei.lin@xxxxxxxxxxxxxxx>
---
 kernel/events/core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/kernel/events/core.c b/kernel/events/core.c
index 3e691b7..6f6bd1e 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -662,7 +662,9 @@ static inline void update_cgrp_time_from_event(struct perf_event *event)
 	/*
 	 * Do not update time when cgroup is not active
 	 */
-	if (cgrp == event->cgrp)
+	if (cgrp == event->cgrp ||
+		cgroup_is_descendant(cgrp->css.cgroup,
+			event->cgrp->css.cgroup))
 		__update_cgrp_time(event->cgrp);
 }
 
-- 
2.8.4.31.g9ed660f