linux-kernel - Re: [PATCH 0/4] Simplify cpuset API and fix cpuset check in SL[AU]B

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Date:	Mon, 29 Sep 2014 15:25:22 +0800
From:	Zefan Li <lizefan@...wei.com>
To:	Vladimir Davydov <vdavydov@...allels.com>
CC:	<linux-kernel@...r.kernel.org>, Christoph Lameter <cl@...ux.com>,
	"Pekka Enberg" <penberg@...nel.org>,
	David Rientjes <rientjes@...gle.com>,
	"Joonsoo Kim" <iamjoonsoo.kim@....com>,
	Andrew Morton <akpm@...ux-foundation.org>, <linux-mm@...ck.org>
Subject: Re: [PATCH 0/4] Simplify cpuset API and fix cpuset check in SL[AU]B

On 2014/9/26 22:50, Vladimir Davydov wrote:
> Hi,
> 
> SLAB and SLUB use hardwall cpuset check on fallback alloc, while the
> page allocator uses softwall check for all kernel allocations. This may
> result in falling into the page allocator even if there are free objects
> on other nodes. SLAB algorithm is especially affected: the number of
> objects allocated in vain is unlimited, so that they theoretically can
> eat up a whole NUMA node. For more details see comments to patches 3, 4.
> 
> When I last sent a fix (https://lkml.org/lkml/2014/8/10/100), David
> found the whole cpuset API being cumbersome and proposed to simplify it
> before getting to fixing its users. So this patch set addresses both
> David's complain (patches 1, 2) and the SL[AU]B issues (patches 3, 4).
> 
> Reviews are appreciated.
> 
> Thanks,
> 
> Vladimir Davydov (4):
>   cpuset: convert callback_mutex to a spinlock
>   cpuset: simplify cpuset_node_allowed API
>   slab: fix cpuset check in fallback_alloc
>   slub: fix cpuset check in get_any_partial
> 

Acked-by: Zefan Li <lizefan@...wei.com>

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