From: Zefan Li <lizefan@huawei.com>
To: Vladimir Davydov <vdavydov@parallels.com>
Cc: linux-kernel@vger.kernel.org, Christoph Lameter <cl@linux.com>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
Joonsoo Kim <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org
Subject: Re: [PATCH 0/4] Simplify cpuset API and fix cpuset check in SL[AU]B
Date: Mon, 29 Sep 2014 15:25:22 +0800 [thread overview]
Message-ID: <54290962.8010603@huawei.com> (raw)
In-Reply-To: <cover.1411741632.git.vdavydov@parallels.com>
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@huawei.com>
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WARNING: multiple messages have this Message-ID (diff)
From: Zefan Li <lizefan@huawei.com>
To: Vladimir Davydov <vdavydov@parallels.com>
Cc: <linux-kernel@vger.kernel.org>, Christoph Lameter <cl@linux.com>,
"Pekka Enberg" <penberg@kernel.org>,
David Rientjes <rientjes@google.com>,
"Joonsoo Kim" <iamjoonsoo.kim@lge.com>,
Andrew Morton <akpm@linux-foundation.org>, <linux-mm@kvack.org>
Subject: Re: [PATCH 0/4] Simplify cpuset API and fix cpuset check in SL[AU]B
Date: Mon, 29 Sep 2014 15:25:22 +0800 [thread overview]
Message-ID: <54290962.8010603@huawei.com> (raw)
In-Reply-To: <cover.1411741632.git.vdavydov@parallels.com>
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@huawei.com>
next prev parent reply other threads:[~2014-09-29 7:25 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-09-26 14:50 [PATCH 0/4] Simplify cpuset API and fix cpuset check in SL[AU]B Vladimir Davydov
2014-09-26 14:50 ` Vladimir Davydov
2014-09-26 14:50 ` [PATCH 1/4] cpuset: convert callback_mutex to a spinlock Vladimir Davydov
2014-09-26 14:50 ` Vladimir Davydov
2014-09-26 15:44 ` Christoph Lameter
2014-09-26 15:44 ` Christoph Lameter
2014-09-26 14:50 ` [PATCH 2/4] cpuset: simplify cpuset_node_allowed API Vladimir Davydov
2014-09-26 14:50 ` Vladimir Davydov
2014-09-26 15:53 ` Christoph Lameter
2014-09-26 15:53 ` Christoph Lameter
2014-09-26 14:50 ` [PATCH 3/4] slab: fix cpuset check in fallback_alloc Vladimir Davydov
2014-09-26 14:50 ` Vladimir Davydov
2014-09-26 16:31 ` Christoph Lameter
2014-09-26 16:31 ` Christoph Lameter
2014-09-27 8:12 ` Vladimir Davydov
2014-09-27 8:12 ` Vladimir Davydov
2014-09-26 14:50 ` [PATCH 4/4] slub: fix cpuset check in get_any_partial Vladimir Davydov
2014-09-26 14:50 ` Vladimir Davydov
2014-09-29 7:25 ` Zefan Li [this message]
2014-09-29 7:25 ` [PATCH 0/4] Simplify cpuset API and fix cpuset check in SL[AU]B Zefan Li
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