linux-kernel - Re: [RFC 10/26] mm, slub: do initial checks in ___slab

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Message-ID: <20210525130436.GS30378@techsingularity.net>
Date:   Tue, 25 May 2021 14:04:36 +0100
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        Christoph Lameter <cl@...ux.com>,
        David Rientjes <rientjes@...gle.com>,
        Pekka Enberg <penberg@...nel.org>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jann Horn <jannh@...gle.com>
Subject: Re: [RFC 10/26] mm, slub: do initial checks in  ___slab_alloc() with
 irqs enabled

On Tue, May 25, 2021 at 01:39:30AM +0200, Vlastimil Babka wrote:
> As another step of shortening irq disabled sections in ___slab_alloc(), don't
> disable irqs until doing initial checks if there is a cached percpu slab and
> it's suitable for our allocation.
> 
> Now we have to recheck c->page after actually disabling irqs as an allocation
> in irq might have replaced it.
> 
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>

Minor nit only -- consider adding a comment at the new_slab label that
IRQs must be disabled already.

Acked-by: Mel Gorman <mgorman@...hsingularity.net>

-- 
Mel Gorman
SUSE Labs