From: Christoph Lameter <cl@gentwo.de>
To: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>
Subject: Re: [PATCH] mm, slub: Use prefetchw instead of prefetch
Date: Mon, 11 Oct 2021 09:20:36 +0200 (CEST) [thread overview]
Message-ID: <alpine.DEB.2.22.394.2110110919050.130815@gentwo.de> (raw)
In-Reply-To: <20211008133602.4963-1-42.hyeyoo@gmail.com>
On Fri, 8 Oct 2021, Hyeonggon Yoo wrote:
> It's certain that an object will be not only read, but also
> written after allocation.
get_freepointer is used in multiple code path not only in allocation. It
is for example used when scanning through a freelist.
With this change all objects get needlessly dirtied and the cross cpu
cache contention is increased.
next prev parent reply other threads:[~2021-10-11 7:21 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-08 13:36 [PATCH] mm, slub: Use prefetchw instead of prefetch Hyeonggon Yoo
2021-10-10 22:49 ` David Rientjes
2021-10-11 7:21 ` Vlastimil Babka
2021-10-11 10:33 ` Perf and Hackbench results on my machine Hyeonggon Yoo
2021-10-11 13:49 ` Hyeonggon Yoo
2021-10-11 7:23 ` [PATCH] mm, slub: Use prefetchw instead of prefetch Hyeonggon Yoo
2021-10-11 7:20 ` Christoph Lameter [this message]
2021-10-11 7:32 ` Hyeonggon Yoo
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