linux-kernel - Re: [PATCH 0/4] Reclaim page capture v4

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Date:	Fri,  3 Oct 2008 15:48:28 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	"MinChan Kim" <minchan.kim@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	"Andy Whitcroft" <apw@...dowen.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	"Peter Zijlstra" <peterz@...radead.org>,
	"Christoph Lameter" <cl@...ux-foundation.org>,
	"Rik van Riel" <riel@...hat.com>, "Mel Gorman" <mel@....ul.ie>,
	"Nick Piggin" <nickpiggin@...oo.com.au>,
	"Andrew Morton" <akpm@...ux-foundation.org>
Subject: Re: [PATCH 0/4] Reclaim page capture v4

> Hi, Andy.
> 
> I tested your patch in my desktop.
> The test is just kernel compile with single thread.
> My system environment is as follows.
> 
> model name	: Intel(R) Core(TM)2 Quad CPU    Q6600  @ 2.40GHz
> MemTotal:        2065856 kB
> 
> When I tested vanilla, compile time is as follows.
> 
> 2433.53user 187.96system 42:05.99elapsed 103%CPU (0avgtext+0avgdata
> 0maxresident)k
> 588752inputs+4503408outputs (127major+55456246minor)pagefaults 0swaps
> 
> When I tested your patch, as follows.
> 
> 2489.63user 202.41system 44:47.71elapsed 100%CPU (0avgtext+0avgdata
> 0maxresident)k
> 538608inputs+4503928outputs (130major+55531561minor)pagefaults 0swaps
> 
> Regresstion almost is above 2 minutes.
> Do you think It is a trivial?

Ooops.
this is definitly significant regression.


> I know your patch is good to allocate hugepage.
> But, I think many users don't need it, including embedded system and
> desktop users yet.
> 
> So I suggest you made it enable optionally.

No.
if the patch has this significant regression,
nobody turn on its option.

We should fix that.


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