linux-kernel - Re: [PATCH v3 1/2] mm/slub: limit number of node partial slabs only in cache creation

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Message-ID: <YibgDEmQRCpvl/uu@carbon.dhcp.thefacebook.com>
Date:   Mon, 7 Mar 2022 20:48:12 -0800
From:   Roman Gushchin <roman.gushchin@...ux.dev>
To:     Hyeonggon Yoo <42.hyeyoo@...il.com>
Cc:     linux-mm@...ck.org, Christoph Lameter <cl@...ux.com>,
        Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Marco Elver <elver@...gle.com>,
        Matthew WilCox <willy@...radead.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 1/2] mm/slub: limit number of node partial slabs only
 in cache creation

On Mon, Mar 07, 2022 at 07:40:55AM +0000, Hyeonggon Yoo wrote:
> SLUB sets number of minimum partial slabs for node (min_partial)
> using set_min_partial(). SLUB holds at least min_partial slabs even if
> they're empty to avoid excessive use of page allocator.
> 
> set_min_partial() limits value of min_partial limits value of
> min_partial MIN_PARTIAL and MAX_PARTIAL. As set_min_partial() can be
> called by min_partial_store() too, Only limit value of min_partial
> in kmem_cache_open() so that it can be changed to value that a user wants.
> 
> [ rientjes@...gle.com: Fold set_min_partial() into its callers ]
> 
> Signed-off-by: Hyeonggon Yoo <42.hyeyoo@...il.com>
> Reviewed-by: Vlastimil Babka <vbabka@...e.cz>

LGTM!

Reviewed-by: Roman Gushchin <roman.gushchin@...ux.dev>