linux-kernel - Re: [PATCH] mm/slub: branch optimization in free slowpath

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Message-ID: <alpine.DEB.2.22.394.2008131647040.112773@www.lameter.com>
Date:   Thu, 13 Aug 2020 16:47:30 +0000 (UTC)
From:   Christopher Lameter <cl@...ux.com>
To:     Abel Wu <wuyun.wu@...wei.com>
cc:     Pekka Enberg <penberg@...nel.org>,
        David Rientjes <rientjes@...gle.com>,
        Joonsoo Kim <iamjoonsoo.kim@....com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        hewenliang4@...wei.com, hushiyuan@...wei.com,
        "open list:SLAB ALLOCATOR" <linux-mm@...ck.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/slub: branch optimization in free slowpath

On Thu, 13 Aug 2020, wuyun.wu@...wei.com wrote:

> The two conditions are mutually exclusive and gcc compiler will
> optimise this into if-else-like pattern. Given that the majority
> of free_slowpath is free_frozen, let's provide some hint to the
> compilers.

Acked-by: Christoph Lameter <cl@...ux.com>