zangchunxin@xxxxxxxxxxxxx writes:
From: Chunxin Zang <zangchunxin@xxxxxxxxxxxxx> On our server, there are about 10k memcg in one machine. They use memory very frequently. We have observed that drop_caches can take a considerable amount of time, and can't stop it. There are two reasons: 1. There is somebody constantly generating more objects to reclaim on drop_caches, result the 'freed' always bigger than 10. 2. The process has no chance to process signals. We can get the following info through 'ps': root:~# ps -aux | grep drop root 357956 ... R Aug25 21119854:55 echo 3 > /proc/sys/vm/drop_caches root 1771385 ... R Aug16 21146421:17 echo 3 > /proc/sys/vm/drop_caches Add a bail out on the fatal signals in the main loop so that the operation can be terminated by userspace. Signed-off-by: Chunxin Zang <zangchunxin@xxxxxxxxxxxxx> Signed-off-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
Acked-by: Chris Down <chris@xxxxxxxxxxxxxx>
