linux-kernel - Re: [RFC] high system time & lock contention running large mixed workload

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Message-Id: <1259962013.3221.8.camel@dhcp-100-19-198.bos.redhat.com>
Date:	Fri, 04 Dec 2009 16:26:52 -0500
From:	Larry Woodman <lwoodman@...hat.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	akpm@...ux-foundation.org,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Andrea Arcangeli <aarcange@...hat.com>
Subject: Re: [RFC] high system time & lock contention running large mixed
	workload

On Thu, 2009-12-03 at 19:29 -0500, Rik van Riel wrote:
> On 12/03/2009 05:14 PM, Larry Woodman wrote:
> 
> > The attached patch addresses this issue by changing page_check_address()
> > to return -1 if the spin_trylock() fails and page_referenced_one() to
> > return 1 in that path so the page gets moved back to the active list.
> 
> Your patch forgot to add the code to vmscan.c to actually move
> the page back to the active list.

Right

> 
> Also, please use an enum for the page_referenced return
> values, so the code in vmscan.c can use symbolic names.
> 
> enum page_reference {
> 	NOT_REFERENCED,
> 	REFERENCED,
> 	LOCK_CONTENDED,
> };
> 

Here it is:




View attachment "page_referenced.patch" of type "text/x-patch" (11270 bytes)