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

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Date:	Fri, 24 Feb 2012 16:05:53 -0800
From:	Tim Chen <tim.c.chen@...ux.intel.com>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
Cc:	Hugh Dickins <hughd@...gle.com>, linux-kernel@...r.kernel.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

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.

Tim

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