linux-kernel - Re: [PATCH 4/4] slub: refactoring unfreeze

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Date:	Fri, 1 Jun 2012 21:28:52 +0900 (KST)
From:	Joonsoo Kim <js1304@...il.com>
To:	Christoph Lameter <cl@...ux.com>
cc:	Pekka Enberg <penberg@...nel.org>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [PATCH 4/4] slub: refactoring unfreeze_partials()



On Thu, 17 May 2012, Christoph Lameter wrote:

> On Fri, 18 May 2012, Joonsoo Kim wrote:
>
>> I think that these are disadvantages of current implementation,
>> so I do refactoring unfreeze_partials().
>
> The reason the current implementation is so complex is to avoid races. The
> state of the list and the state of the partial pages must be consistent at
> all times.
>
>> Minimizing code in do {} while loop introduce a reduced fail rate
>> of cmpxchg_double_slab. Below is output of 'slabinfo -r kmalloc-256'
>> when './perf stat -r 33 hackbench 50 process 4000 > /dev/null' is done.
>
> Looks good. If I can convince myself that this does not open up any
> new races then I may ack it.

This is a reminder mail.
Would u give me some comments for this please?
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