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

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Message-ID: <20210818075316.GB501393@hori.linux.bs1.fc.nec.co.jp>
Date:   Wed, 18 Aug 2021 07:53:17 +0000
From:   HORIGUCHI NAOYA(堀口　直也) 
        <naoya.horiguchi@....com>
To:     David Hildenbrand <david@...hat.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 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);


- Naoya Horiguchi