linux-kernel - Re: Populating multiple ptes at fault time

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Message-Id: <20080918162644.1d4beab7.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 18 Sep 2008 16:26:44 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	"MinChan Kim" <minchan.kim@...il.com>
Cc:	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	"Rik van Riel" <riel@...hat.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Nick Piggin" <nickpiggin@...oo.com.au>,
	"Hugh Dickens" <hugh@...itas.com>,
	"Linux Memory Management List" <linux-mm@...ck.org>,
	"Linux Kernel Mailing List" <linux-kernel@...r.kernel.org>,
	"Avi Kivity" <avi@...ranet.com>
Subject: Re: Populating multiple ptes at fault time

On Thu, 18 Sep 2008 08:50:05 +0900
"MinChan Kim" <minchan.kim@...il.com> wrote:

> Hi, all
> 
> I have been thinking about this idea in native.
> I didn't consider it in minor page fault.
> As you know, it costs more cheap than major fault.
> However, the page fault is one of big bottleneck on demand-paging system.
> I think major fault might be a rather big overhead in many core system.
> 
> What do you think about this idea in native ?
> Do you really think that this idea don't help much in native ?
> 
Hmm, is enlarging page-size-for-anonymous-page more difficult ?
(maybe, yes.)

> If I implement it in native, What kinds of benchmark do I need?
> Could you recommend any benchmark ?
> 

Testing some kind of scripts (shell/perl etc..) is candidates.

I use unixbench's exec/shell test to see charge/uncharge overhead of memory
resource controller, which happens at major page fault.

Thanks,
-Kame

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