linux-kernel - Re: [PATCH 1/2] mm: hwpoison: don't drop slab caches for offlining non-LRU page

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Date:   Wed, 18 Aug 2021 09:55:22 +0200
From:   David Hildenbrand <david@...hat.com>
To:     HORIGUCHI NAOYA(堀口 直也) 
        <naoya.horiguchi@....com>
Cc:     Naoya Horiguchi <naoya.horiguchi@...ux.dev>,
        Yang Shi <shy828301@...il.com>,
        "osalvador@...e.de" <osalvador@...e.de>,
        "tdmackey@...tter.com" <tdmackey@...tter.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "corbet@....net" <corbet@....net>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] mm: hwpoison: don't drop slab caches for offlining
 non-LRU page

On 18.08.21 09:53, HORIGUCHI NAOYA(堀口 直也) wrote:
> On Wed, Aug 18, 2021 at 09:24:01AM +0200, David Hildenbrand wrote:
> ...
>>
>> Might we want to add a TODO in the code? We have a similar one in
>> mm/page_isolation.c:set_migratetype_isolate() and it's certainly a reminder
>> that something of value is missing.
> 
> Yes, that will be helpful.  The below's what's in my mind, but if someone
> has better idea, that's fine.
> 
> @@ -296,11 +296,9 @@ void shake_page(struct page *p, int access)
>   	}
>   	
>   	/*
> -	 * Only call shrink_node_slabs here (which would also shrink
> -	 * other caches) if access is not potentially fatal.
> +	 * TODO: Could shrink slab caches here if a lightweight range-based
> +	 * shrinker will be available.
>   	 */
> -	if (access)
> -		drop_slab_node(page_to_nid(p));
>   }
>   EXPORT_SYMBOL_GPL(shake_page);

Just what I had in mind, thanks!


-- 
Thanks,

David / dhildenb