linux-kernel - Re: [PATCH v3 00/21] mm: lru

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Date:	Sat, 25 Feb 2012 09:34:04 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
CC:	Hugh Dickins <hughd@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Johannes Weiner <hannes@...xchg.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH v3 00/21] mm: lru_lock splitting

Tim Chen wrote:
> On Thu, 2012-02-23 at 17:51 +0400, Konstantin Khlebnikov wrote:
>> v3 changes:
>> * inactive-ratio reworked again, now it always calculated from from scratch
>> * hierarchical pte reference bits filter in memory-cgroup reclaimer
>> * fixed two bugs in locking, found by Hugh Dickins
>> * locking functions slightly simplified
>> * new patch for isolated pages accounting
>> * new patch with lru interleaving
>>
>> This patchset is based on next-20120210
>>
>> git: https://github.com/koct9i/linux/commits/lruvec-v3
>>
>> ---
>
> I am seeing an improvement of about 7% in throughput in a workload where
> I am doing parallel reading of files that are mmaped. The contention on
> lru_lock used to be 13% in the cpu profile on the __pagevec_lru_add code
> path. Now lock contention on this path drops to about 0.6%.  I have 40
> hyper-threaded enabled cpu cores running 80 mmaped file reading
> processes.
>
> So initial testing of this patch set looks encouraging.

That's great!

>
> Tim
>

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