linux-kernel - Re: [PATCH] mm: vmscan: export func:shrink

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Message-ID: <33eabee3-f6f4-ee0c-d74b-98815a9567c4@redhat.com>
Date:   Fri, 16 Jun 2023 11:42:46 +0200
From:   David Hildenbrand <david@...hat.com>
To:     lipeifeng@...o.com, akpm@...ux-foundation.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        surenb@...gle.com, gregkh@...gle.com
Subject: Re: [PATCH] mm: vmscan: export func:shrink_slab

On 16.06.23 11:21, lipeifeng@...o.com wrote:
> From: lipeifeng <lipeifeng@...o.com>
> 
> Some of shrinkers during shrink_slab would enter synchronous-wait
> due to lock or other reasons, which would causes kswapd or
> direct_reclaim to be blocked.
> 
> This patch export shrink_slab so that it can be called in drivers
> which can shrink memory independently.
> 
> Signed-off-by: lipeifeng <lipeifeng@...o.com>
> ---
>   mm/vmscan.c | 3 ++-
>   1 file changed, 2 insertions(+), 1 deletion(-)
> 
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index 6d0cd2840cf0..2e54fa52e7ec 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -1043,7 +1043,7 @@ static unsigned long shrink_slab_memcg(gfp_t gfp_mask, int nid,
>    *
>    * Returns the number of reclaimed slab objects.
>    */
> -static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
> +unsigned long shrink_slab(gfp_t gfp_mask, int nid,
>   				 struct mem_cgroup *memcg,
>   				 int priority)
>   {
> @@ -1087,6 +1087,7 @@ static unsigned long shrink_slab(gfp_t gfp_mask, int nid,
>   	cond_resched();
>   	return freed;
>   }
> +EXPORT_SYMBOL_GPL(shrink_slab);
>   
>   static unsigned long drop_slab_node(int nid)
>   {

It feels like something we don't want arbitrary drivers to call.

Unrelated to that, this better be sent along with actual driver usage.

-- 
Cheers,

David / dhildenb