linux-kernel - Re: [RFC][PATCH] the proposal of improve page reclaim by throttle

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Message-ID: <20080219083124.2daf94e9@bree.surriel.com>
Date:	Tue, 19 Feb 2008 08:31:24 -0500
From:	Rik van Riel <riel@...hat.com>
To:	Nick Piggin <nickpiggin@...oo.com.au>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [RFC][PATCH] the proposal of improve page reclaim by throttle

On Tue, 19 Feb 2008 17:34:59 +1100
Nick Piggin <nickpiggin@...oo.com.au> wrote:

> On Tuesday 19 February 2008 16:44, KOSAKI Motohiro wrote:
> > background
> > ========================================
> > current VM implementation doesn't has limit of # of parallel reclaim.
> > when heavy workload, it bring to 2 bad things
> >   - heavy lock contention
> >   - unnecessary swap out

> I think it should maybe be a per-zone thing...
> 
> What happens if you make it a per-zone mutex, and allow just a single
> process to reclaim pages from a given zone at a time? I guess that is
> going to slow down throughput a little bit in some cases though...

I agree, doing things per zone will probably work better, because
that way one process can do page reclaim on every NUMA node at
the same time.

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