linux-kernel - Re: [PATCH 01/29] mm: shrinker: add shrinker::private

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Date:   Thu, 22 Jun 2023 16:47:58 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     Qi Zheng <zhengqi.arch@...edance.com>, akpm@...ux-foundation.org,
        david@...morbit.com, tkhai@...ru, roman.gushchin@...ux.dev,
        djwong@...nel.org, brauner@...nel.org, paulmck@...nel.org,
        tytso@....edu
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, dm-devel@...hat.com,
        linux-raid@...r.kernel.org, linux-bcache@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        linux-fsdevel@...r.kernel.org, linux-ext4@...r.kernel.org,
        linux-nfs@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-btrfs@...r.kernel.org
Subject: Re: [PATCH 01/29] mm: shrinker: add shrinker::private_data field

On 6/22/23 10:53, Qi Zheng wrote:
> To prepare for the dynamic allocation of shrinker instances
> embedded in other structures, add a private_data field to
> struct shrinker, so that we can use shrinker::private_data
> to record and get the original embedded structure.
> 
> Signed-off-by: Qi Zheng <zhengqi.arch@...edance.com>

I would fold this to 02/29, less churn.

> ---
>  include/linux/shrinker.h | 2 ++
>  1 file changed, 2 insertions(+)
> 
> diff --git a/include/linux/shrinker.h b/include/linux/shrinker.h
> index 224293b2dd06..43e6fcabbf51 100644
> --- a/include/linux/shrinker.h
> +++ b/include/linux/shrinker.h
> @@ -70,6 +70,8 @@ struct shrinker {
>  	int seeks;	/* seeks to recreate an obj */
>  	unsigned flags;
>  
> +	void *private_data;
> +
>  	/* These are for internal use */
>  	struct list_head list;
>  #ifdef CONFIG_MEMCG