linux-kernel - Re: [RFC 0/4] [RFC] slub: Fastpath optimization (especially for RT)

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Message-ID: <alpine.DEB.2.11.1410240938460.29214@gentwo.org>
Date:	Fri, 24 Oct 2014 09:41:49 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
cc:	akpm@...uxfoundation.org, rostedt@...dmis.org,
	linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
	linux-mm@...ck.org, penberg@...nel.org, iamjoonsoo@....com
Subject: Re: [RFC 0/4] [RFC] slub: Fastpath optimization (especially for
 RT)

> I found that you said retrieving tid first is sufficient to do
> things right in old discussion. :)

Right but the tid can be obtained from a different processor.

One other aspect of this patchset is that it reduces the cache footprint
of the alloc and free functions. This typically results in a performance
increase for the allocator. If we can avoid the page_address() and
virt_to_head_page() stuff that is required because we drop the ->page
field in a sufficient number of places then this may be a benefit that
goes beyond the RT and CONFIG_PREEMPT case.

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