linux-kernel - Re: [PATCH v4 5/8] mm: shrinkers: make count and scan in shrinker debugfs lockless

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Date:   Thu, 9 Mar 2023 10:39:11 +0100
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Qi Zheng <zhengqi.arch@...edance.com>, akpm@...ux-foundation.org,
        tkhai@...ru, hannes@...xchg.org, shakeelb@...gle.com,
        mhocko@...nel.org, roman.gushchin@...ux.dev, muchun.song@...ux.dev,
        david@...hat.com, shy828301@...il.com, rppt@...nel.org
Cc:     sultan@...neltoast.com, dave@...olabs.net,
        penguin-kernel@...ove.SAKURA.ne.jp, paulmck@...nel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 5/8] mm: shrinkers: make count and scan in shrinker
 debugfs lockless

On 3/7/23 07:56, Qi Zheng wrote:
> Like global and memcg slab shrink, also use SRCU to
> make count and scan operations in memory shrinker
> debugfs lockless.
> 
> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
> ---
>  mm/shrinker_debug.c | 24 +++++++-----------------
>  1 file changed, 7 insertions(+), 17 deletions(-)
> 
> diff --git a/mm/shrinker_debug.c b/mm/shrinker_debug.c
> index 39c3491e28a3..6aa7a7ec69da 100644
> --- a/mm/shrinker_debug.c
> +++ b/mm/shrinker_debug.c

Forgot to mention that this file should now likely also #include <linux/srcu.h>

> @@ -9,6 +9,7 @@
>  /* defined in vmscan.c */
>  extern struct rw_semaphore shrinker_rwsem;
>  extern struct list_head shrinker_list;
> +extern struct srcu_struct shrinker_srcu;