linux-kernel - Re: [PATCH 07/12] mm, slab: ignore SLAB_RECLAIM_ACCOUNT with CONFIG_SLUB

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Date:   Thu, 24 Nov 2022 10:21:05 +0100 (CET)
From:   Christoph Lameter <cl@...two.de>
To:     Vlastimil Babka <vbabka@...e.cz>
cc:     Roman Gushchin <roman.gushchin@...ux.dev>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Pekka Enberg <penberg@...nel.org>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>, patches@...ts.linux.dev,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 07/12] mm, slab: ignore SLAB_RECLAIM_ACCOUNT with
 CONFIG_SLUB_TINY

On Thu, 24 Nov 2022, Vlastimil Babka wrote:

> SLAB_RECLAIM_ACCOUNT is kinda misnomer these days, as the only thing it does
> is to add __GFP_RECLAIMABLE to cache's gfp flags for the page allocator's
> mobility grouping. I guess the "ACCOUNT" part comes from being counted
> towards SReclaimable (vs SUnreclaim) in /proc/meminfo.

Well these Sreclaimable etc counters visible in /proc/meminfo are used in
the reclaim logic and are quite important there.