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

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Message-ID: <28c262360810062129h184f15cv5a31e1d598d28a@mail.gmail.com>
Date:	Tue, 7 Oct 2008 13:29:10 +0900
From:	"MinChan Kim" <minchan.kim@...il.com>
To:	"KOSAKI Motohiro" <kosaki.motohiro@...fujitsu.com>
Cc:	"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

On Fri, Oct 3, 2008 at 3:48 PM, KOSAKI Motohiro
<kosaki.motohiro@...fujitsu.com> wrote:
>> 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.

I have been tested it.
But I can't reproduce such as regression.
I don't know why such regression happed at that time.

Sorry for confusing.
Please ignore my test result at that time.

This is new test result.

before

2346.24user 191.44system 42:07.28elapsed 100%CPU (0avgtext+0avgdata
0maxresident)k
458624inputs+4262728outputs (183major+52299730minor)pagefaults 0swaps


after

2349.75user 195.72system 42:16.36elapsed 100%CPU (0avgtext+0avgdata
0maxresident)k
475632inputs+4265208outputs (183major+52308969minor)pagefaults 0swaps

I think we can ignore some time gap.
Sometime, after is faster than before.

I could conclude it doesn't have any regressions in my desktop machine.

Tested-by: MinChan Kim <minchan.kim@...il.com>

-- 
Kinds regards,
MinChan Kim
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