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SubjectRe: [PATCH v5] mm/vmscan: add a fatal signals check in drop_slab_node writes:
>From: Chunxin Zang <>
>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 <>
>Signed-off-by: Muchun Song <>

Acked-by: Chris Down <>

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