linux-kernel - Re: [PATCH 1/2] mm/slub: optimize alloc/free fastpath by removing preemption on/off

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Message-ID: <alpine.DEB.2.11.1501050852060.24090@gentwo.org>
Date:	Mon, 5 Jan 2015 08:52:30 -0600 (CST)
From:	Christoph Lameter <cl@...ux.com>
To:	Joonsoo Kim <iamjoonsoo.kim@....com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Jesper Dangaard Brouer <brouer@...hat.com>,
	rostedt@...dmis.org, Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/2] mm/slub: optimize alloc/free fastpath by removing
 preemption on/off

On Mon, 5 Jan 2015, Joonsoo Kim wrote:

> Now, I reach the solution to remove preempt enable/disable in the fastpath.
> If tid is matched with kmem_cache_cpu's tid after tid and kmem_cache_cpu
> are retrieved by separate this_cpu operation, it means that they are
> retrieved on the same cpu. If not matched, we just have to retry it.

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