From: Roman Gushchin <guro@fb.com>
To: Yang Shi <shy828301@gmail.com>
Cc: <ktkhai@virtuozzo.com>, <vbabka@suse.cz>, <shakeelb@google.com>,
<david@fromorbit.com>, <hannes@cmpxchg.org>, <mhocko@suse.com>,
<akpm@linux-foundation.org>, <linux-mm@kvack.org>,
<linux-fsdevel@vger.kernel.org>, <linux-kernel@vger.kernel.org>
Subject: Re: [v7 PATCH 10/12] mm: vmscan: don't need allocate shrinker->nr_deferred for memcg aware shrinkers
Date: Tue, 9 Feb 2021 17:23:31 -0800 [thread overview]
Message-ID: <20210210012331.GN524633@carbon.DHCP.thefacebook.com> (raw)
In-Reply-To: <20210209174646.1310591-11-shy828301@gmail.com>
On Tue, Feb 09, 2021 at 09:46:44AM -0800, Yang Shi wrote:
> Now nr_deferred is available on per memcg level for memcg aware shrinkers, so don't need
> allocate shrinker->nr_deferred for such shrinkers anymore.
>
> The prealloc_memcg_shrinker() would return -ENOSYS if !CONFIG_MEMCG or memcg is disabled
> by kernel command line, then shrinker's SHRINKER_MEMCG_AWARE flag would be cleared.
> This makes the implementation of this patch simpler.
>
> Acked-by: Vlastimil Babka <vbabka@suse.cz>
> Reviewed-by: Kirill Tkhai <ktkhai@virtuozzo.com>
> Signed-off-by: Yang Shi <shy828301@gmail.com>
Acked-by: Roman Gushchin <guro@fb.com>
Thanks!
> ---
> mm/vmscan.c | 33 ++++++++++++++++++---------------
> 1 file changed, 18 insertions(+), 15 deletions(-)
>
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 748aa6e90f83..dfde6e7fd7f5 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -338,6 +338,9 @@ static int prealloc_memcg_shrinker(struct shrinker *shrinker)
> {
> int id, ret = -ENOMEM;
>
> + if (mem_cgroup_disabled())
> + return -ENOSYS;
> +
> down_write(&shrinker_rwsem);
> /* This may call shrinker, so it must use down_read_trylock() */
> id = idr_alloc(&shrinker_idr, shrinker, 0, 0, GFP_KERNEL);
> @@ -417,7 +420,7 @@ static bool writeback_throttling_sane(struct scan_control *sc)
> #else
> static int prealloc_memcg_shrinker(struct shrinker *shrinker)
> {
> - return 0;
> + return -ENOSYS;
> }
>
> static void unregister_memcg_shrinker(struct shrinker *shrinker)
> @@ -528,8 +531,18 @@ unsigned long lruvec_lru_size(struct lruvec *lruvec, enum lru_list lru, int zone
> */
> int prealloc_shrinker(struct shrinker *shrinker)
> {
> - unsigned int size = sizeof(*shrinker->nr_deferred);
> + unsigned int size;
> + int err;
>
> + if (shrinker->flags & SHRINKER_MEMCG_AWARE) {
> + err = prealloc_memcg_shrinker(shrinker);
> + if (err != -ENOSYS)
> + return err;
> +
> + shrinker->flags &= ~SHRINKER_MEMCG_AWARE;
> + }
> +
> + size = sizeof(*shrinker->nr_deferred);
> if (shrinker->flags & SHRINKER_NUMA_AWARE)
> size *= nr_node_ids;
>
> @@ -537,26 +550,16 @@ int prealloc_shrinker(struct shrinker *shrinker)
> if (!shrinker->nr_deferred)
> return -ENOMEM;
>
> - if (shrinker->flags & SHRINKER_MEMCG_AWARE) {
> - if (prealloc_memcg_shrinker(shrinker))
> - goto free_deferred;
> - }
>
> return 0;
> -
> -free_deferred:
> - kfree(shrinker->nr_deferred);
> - shrinker->nr_deferred = NULL;
> - return -ENOMEM;
> }
>
> void free_prealloced_shrinker(struct shrinker *shrinker)
> {
> - if (!shrinker->nr_deferred)
> - return;
> -
> - if (shrinker->flags & SHRINKER_MEMCG_AWARE)
> + if (shrinker->flags & SHRINKER_MEMCG_AWARE) {
> unregister_memcg_shrinker(shrinker);
> + return;
> + }
>
> kfree(shrinker->nr_deferred);
> shrinker->nr_deferred = NULL;
> --
> 2.26.2
>
next prev parent reply other threads:[~2021-02-10 2:18 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-09 17:46 [v7 PATCH 0/12] Make shrinker's nr_deferred memcg aware Yang Shi
2021-02-09 17:46 ` [v7 PATCH 01/12] mm: vmscan: use nid from shrink_control for tracepoint Yang Shi
2021-02-09 19:14 ` Shakeel Butt
2021-02-10 16:58 ` Yang Shi
2021-02-09 19:21 ` Roman Gushchin
2021-02-09 17:46 ` [v7 PATCH 02/12] mm: vmscan: consolidate shrinker_maps handling code Yang Shi
2021-02-09 20:27 ` Roman Gushchin
2021-02-10 14:19 ` Shakeel Butt
2021-02-09 17:46 ` [v7 PATCH 03/12] mm: vmscan: use shrinker_rwsem to protect shrinker_maps allocation Yang Shi
2021-02-09 20:33 ` Roman Gushchin
2021-02-09 23:28 ` Yang Shi
2021-02-09 17:46 ` [v7 PATCH 04/12] mm: vmscan: remove memcg_shrinker_map_size Yang Shi
2021-02-09 20:43 ` Roman Gushchin
2021-02-09 23:31 ` Yang Shi
2021-02-10 18:14 ` Vlastimil Babka
2021-02-09 17:46 ` [v7 PATCH 05/12] mm: memcontrol: rename shrinker_map to shrinker_info Yang Shi
2021-02-09 20:50 ` Roman Gushchin
2021-02-09 23:33 ` Yang Shi
2021-02-10 0:16 ` Roman Gushchin
2021-02-11 16:47 ` Kirill Tkhai
2021-02-11 17:29 ` Yang Shi
2021-02-09 17:46 ` [v7 PATCH 06/12] mm: vmscan: add shrinker_info_protected() helper Yang Shi
2021-02-10 0:22 ` Roman Gushchin
2021-02-10 1:07 ` Yang Shi
2021-02-10 1:29 ` Roman Gushchin
2021-02-10 12:12 ` Kirill Tkhai
2021-02-10 18:17 ` Vlastimil Babka
2021-02-12 6:54 ` [mm] bd741fb2ad: WARNING:suspicious_RCU_usage kernel test robot
2021-02-09 17:46 ` [v7 PATCH 07/12] mm: vmscan: use a new flag to indicate shrinker is registered Yang Shi
2021-02-10 0:39 ` Roman Gushchin
2021-02-10 1:12 ` Yang Shi
2021-02-10 1:34 ` Roman Gushchin
2021-02-10 1:55 ` Yang Shi
2021-02-10 18:45 ` Yang Shi
2021-02-10 18:23 ` Vlastimil Babka
2021-02-09 17:46 ` [v7 PATCH 08/12] mm: vmscan: add per memcg shrinker nr_deferred Yang Shi
2021-02-10 1:10 ` Roman Gushchin
2021-02-10 1:25 ` Yang Shi
2021-02-10 1:40 ` Roman Gushchin
2021-02-10 1:57 ` Yang Shi
2021-02-09 17:46 ` [v7 PATCH 09/12] mm: vmscan: use per memcg nr_deferred of shrinker Yang Shi
2021-02-10 1:27 ` Roman Gushchin
2021-02-10 1:52 ` Yang Shi
2021-02-10 14:36 ` Kirill Tkhai
2021-02-10 16:41 ` Yang Shi
2021-02-09 17:46 ` [v7 PATCH 10/12] mm: vmscan: don't need allocate shrinker->nr_deferred for memcg aware shrinkers Yang Shi
2021-02-10 1:23 ` Roman Gushchin [this message]
2021-02-09 17:46 ` [v7 PATCH 11/12] mm: memcontrol: reparent nr_deferred when memcg offline Yang Shi
2021-02-10 1:18 ` Roman Gushchin
2021-02-09 17:46 ` [v7 PATCH 12/12] mm: vmscan: shrink deferred objects proportional to priority Yang Shi
2021-02-11 13:10 ` Vlastimil Babka
2021-02-11 17:29 ` Yang Shi
2021-02-11 18:52 ` Vlastimil Babka
2021-02-11 19:15 ` Yang Shi
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