On 01.02.2021 17:10, Andrey Ryabinin wrote:
> shrink_slab_memcg() may iterate for a long time without resched if we
> have many memcg with small amount of objects. Add cond_resched() to
> avoid potential softlockup.
>
> https://jira.sw.ru/browse/PSBM-125095
> Signed-off-by: Andrey Ryabinin <aryabi...@virtuozzo.com>
Reviewed-by: Kirill Tkhai <ktk...@virtuozzo.com>
> ---
> mm/vmscan.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 080500f4e366..17a7ed60f525 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -527,6 +527,8 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask,
> int nid,
> struct shrinker *shrinker;
> bool is_nfs;
>
> + cond_resched();
> +
> shrinker = idr_find(&shrinker_idr, i);
> if (unlikely(!shrinker)) {
> clear_bit(i, map->map);
>
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