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Re: [PATCH v2 42/47] drm/ttm: introduce pool_shrink_rwsem
- To: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
- From: Muchun Song <muchun.song@xxxxxxxxx>
- Date: Wed, 26 Jul 2023 15:56:40 +0800
- Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, david@xxxxxxxxxxxxx, tkhai@xxxxx, Vlastimil Babka <vbabka@xxxxxxx>, Roman Gushchin <roman.gushchin@xxxxxxxxx>, djwong@xxxxxxxxxx, Christian Brauner <brauner@xxxxxxxxxx>, "Paul E. McKenney" <paulmck@xxxxxxxxxx>, tytso@xxxxxxx, steven.price@xxxxxxx, cel@xxxxxxxxxx, Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>, yujie.liu@xxxxxxxxx, gregkh@xxxxxxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx, linux-mm@xxxxxxxxx, x86@xxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-erofs@xxxxxxxxxxxxxxxx, linux-f2fs-devel@xxxxxxxxxxxxxxxxxxxxx, cluster-devel@xxxxxxxxxx, linux-nfs@xxxxxxxxxxxxxxx, linux-mtd@xxxxxxxxxxxxxxxxxxx, rcu@xxxxxxxxxxxxxxx, netdev@xxxxxxxxxxxxxxx, dri-devel@xxxxxxxxxxxxxxxxxxxxx, linux-arm-msm@xxxxxxxxxxxxxxx, dm-devel@xxxxxxxxxx, linux-raid@xxxxxxxxxxxxxxx, linux-bcache@xxxxxxxxxxxxxxx, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, linux-ext4@xxxxxxxxxxxxxxx, linux-xfs@xxxxxxxxxxxxxxx, linux-btrfs@xxxxxxxxxxxxxxx
- Delivery-date: Wed, 26 Jul 2023 07:57:23 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
> On Jul 24, 2023, at 17:43, Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx> wrote:
>
> Currently, the synchronize_shrinkers() is only used by TTM pool. It only
> requires that no shrinkers run in parallel.
>
> After we use RCU+refcount method to implement the lockless slab shrink,
> we can not use shrinker_rwsem or synchronize_rcu() to guarantee that all
> shrinker invocations have seen an update before freeing memory.
>
> So we introduce a new pool_shrink_rwsem to implement a private
> synchronize_shrinkers(), so as to achieve the same purpose.
>
> Signed-off-by: Qi Zheng <zhengqi.arch@xxxxxxxxxxxxx>
Reviewed-by: Muchun Song <songmuchun@xxxxxxxxxxxxx>
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