* [PATCH] mm: memcontrol: drain memcg stock on force_empty
@ 2018-05-07 20:16 Shakeel Butt
2018-05-07 20:19 ` Shakeel Butt
2018-05-09 8:18 ` Michal Hocko
0 siblings, 2 replies; 3+ messages in thread
From: Shakeel Butt @ 2018-05-07 20:16 UTC (permalink / raw)
To: Michal Hocko, Andrew Morton, Greg Thelen, Johannes Weiner,
Vladimir Davydov
Cc: Linux MM, Cgroups, LKML, Junaid Shahid, Junaid Shahid, Shakeel Butt
From: Junaid Shahid <junaids@google.com>
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@google.com>
Signed-off-by: Shakeel Butt <shakeelb@google.com>
---
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
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] mm: memcontrol: drain memcg stock on force_empty
2018-05-07 20:16 [PATCH] mm: memcontrol: drain memcg stock on force_empty Shakeel Butt
@ 2018-05-07 20:19 ` Shakeel Butt
2018-05-09 8:18 ` Michal Hocko
1 sibling, 0 replies; 3+ messages in thread
From: Shakeel Butt @ 2018-05-07 20:19 UTC (permalink / raw)
To: Michal Hocko, Andrew Morton, Greg Thelen, Johannes Weiner,
Vladimir Davydov
Cc: Linux MM, Cgroups, LKML, Junaid Shahid, Junaid Shahid
On Mon, May 7, 2018 at 1:16 PM Shakeel Butt <shakeelb@google.com> wrote:
> From: Junaid Shahid <junaids@google.com>
> 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@google.com>
This should be "Junaid Shahid <junaids@google.com>".
> Signed-off-by: Shakeel Butt <shakeelb@google.com>
> ---
> 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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] mm: memcontrol: drain memcg stock on force_empty
2018-05-07 20:16 [PATCH] mm: memcontrol: drain memcg stock on force_empty Shakeel Butt
2018-05-07 20:19 ` Shakeel Butt
@ 2018-05-09 8:18 ` Michal Hocko
1 sibling, 0 replies; 3+ messages in thread
From: Michal Hocko @ 2018-05-09 8:18 UTC (permalink / raw)
To: Shakeel Butt
Cc: Andrew Morton, Greg Thelen, Johannes Weiner, Vladimir Davydov,
Linux MM, Cgroups, LKML, Junaid Shahid, Junaid Shahid
On Mon 07-05-18 13:16:51, Shakeel Butt wrote:
> From: Junaid Shahid <junaids@google.com>
>
> 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@google.com>
> Signed-off-by: Shakeel Butt <shakeelb@google.com>
Acked-by: Michal Hocko <mhocko@suse.com>
> ---
> 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
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2018-05-09 8:18 UTC | newest]
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2018-05-07 20:16 [PATCH] mm: memcontrol: drain memcg stock on force_empty Shakeel Butt
2018-05-07 20:19 ` Shakeel Butt
2018-05-09 8:18 ` Michal Hocko
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