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

From: Zefan Li
Date: Mon Sep 29 2014 - 03:26:02 EST

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 (, 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@xxxxxxxxxx>

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