linux-kernel - Re: [PATCH v4 4/8] mm: vmscan: add shrinker_srcu

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Date:   Thu, 9 Mar 2023 18:12:54 +0800
From:   Qi Zheng <zhengqi.arch@...edance.com>
To:     Vlastimil Babka <vbabka@...e.cz>, 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 4/8] mm: vmscan: add shrinker_srcu_generation



On 2023/3/9 17:23, Vlastimil Babka wrote:
> On 3/7/23 07:56, Qi Zheng wrote:
>> From: Kirill Tkhai <tkhai@...ru>
>>
>> After we make slab shrink lockless with SRCU, the longest
>> sleep unregister_shrinker() will be a sleep waiting for
>> all do_shrink_slab() calls.
>>
>> To aviod long unbreakable action in the unregister_shrinker(),
> 
>       ^ avoid

will change.

> 
>> add shrinker_srcu_generation to restore a check similar to the
>> rwsem_is_contendent() check that we had before.
>>
>> And for memcg slab shrink, we unlock SRCU and continue
>> iterations from the next shrinker id.
>>
>> Signed-off-by: Kirill Tkhai <tkhai@...ru>
>> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>
> 
> Acked-by: Vlastimil Babka <vbabka@...e.cz>

Thanks.

> 
> 

-- 
Thanks,
Qi