On Mon 07-05-18 13:16:51, Shakeel Butt wrote:
> From: Junaid Shahid <junaids@xxxxxxxxxx>
>
> The per-cpu memcg stock can retain a charge of upto 32 pages. On a
> machine with large number of cpus, this can amount to a decent amount
> of memory. Additionally force_empty interface might be triggering
> unneeded memcg reclaims.
>
> Signed-off-by: Junaid Shahid <juanids@xxxxxxxxxx>
> Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxx>
> ---
> mm/memcontrol.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index e2d33a37f971..2c3c69524b49 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -2841,6 +2841,9 @@ static int mem_cgroup_force_empty(struct mem_cgroup *memcg)
>
> /* we call try-to-free pages for make this cgroup empty */
> lru_add_drain_all();
> +
> + drain_all_stock(memcg);
> +
> /* try to free all pages in this cgroup */
> while (nr_retries && page_counter_read(&memcg->memory)) {
> int progress;
> --
> 2.17.0.441.gb46fe60e1d-goog
--
Michal Hocko
SUSE Labs
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