linux-kernel - Re: [PATCH 1/3] slub: set a criteria for slub node partial adding

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Date:	Tue, 13 Dec 2011 18:38:41 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Shaohua Li <shaohua.li@...el.com>
cc:	"Shi, Alex" <alex.shi@...el.com>, Christoph Lameter <cl@...ux.com>,
	"penberg@...nel.org" <penberg@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/3] slub: set a criteria for slub node partial adding

On Wed, 14 Dec 2011, Shaohua Li wrote:

> if vast majority of allocation needs picking from partial list of node,
> the list_lock will have contention too. But I'd say avoiding the slab
> thrashing does increase fastpath.

Right, that's why my 2009 patchset would attempt to grab the partial slab 
with the highest number of free objects to a certain threshold before 
falling back to others and it improved performance somewhat.  This was 
with the per-node partial lists, however, and the slowpath has been 
significantly rewritten since then.
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