linux-kernel - Re: [PATCH v2 1/3] mm/slab: Fix drain freelist excessively

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Message-ID: <0000013f9aed7e5f-f95ae9c1-fb29-41c0-a5ff-9f9aa398c223-000000@email.amazonses.com>
Date:	Mon, 1 Jul 2013 15:50:23 +0000
From:	Christoph Lameter <cl@...ux.com>
To:	Wanpeng Li <liwanp@...ux.vnet.ibm.com>
cc:	Pekka Enberg <penberg@...nel.org>, Matt Mackall <mpm@...enic.com>,
	Glauber Costa <glommer@...allels.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Joonsoo Kim <js1304@...il.com>,
	David Rientjes <rientjes@...gle.com>, lllllinux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/3] mm/slab: Fix drain freelist excessively

On Thu, 27 Jun 2013, Wanpeng Li wrote:

> The drain_freelist is called to drain slabs_free lists for cache reap,
> cache shrink, memory hotplug callback etc. The tofree parameter is the
> number of slab objects to free instead of the number of slabs to free.
> The parameter transfered from callers is n->free_objects or n->freelimit
> + 5 * (searchp->num - 1) / (5 * searchp->num), and both of them mean
> the number of slabs objects. I add printk to dump drain information:

See my reply to V1.
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