linux-kernel - Re: [PATCH v4 4/7] Reclaim invalidated page ASAP

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Message-ID: <AANLkTikT_HNvuBR0J-2COgB54gquj2FineOjkzU+mt6_@mail.gmail.com>
Date:	Tue, 14 Dec 2010 11:36:12 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	Ben Gamari <bgamari.foss@...il.com>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Nick Piggin <npiggin@...nel.dk>
Subject: Re: [PATCH v4 4/7] Reclaim invalidated page ASAP

Hi Ben,

On Tue, Dec 14, 2010 at 5:06 AM, Ben Gamari <bgamari.foss@...il.com> wrote:
> On Tue, 14 Dec 2010 00:31:05 +0900, Minchan Kim <minchan.kim@...il.com> wrote:
>> In summary, my patch enhances a littie bit about elapsed time in
>> memory pressure environment and enhance reclaim effectivness(reclaim/reclaim)
>> with x2. It means reclaim latency is short and doesn't evict working set
>> pages due to invalidated pages.
>>
> Thank you very much for this testing! I'm very sorry I've been unable to
> contribute more recently. My last exam is on Wednesday and besides some
> grading that is the end of the semester.  Is there anything you would

No worry. I hope you have great grade in your exam. :)

> like me to do? Perhaps reproducing these results on my setup would be
> useful?

Thanks very much if you do.

>
>> Look at reclaim effectivness. Patched rsync enhances x2 about reclaim
>> effectiveness and compared to mmotm-12-03, mmotm-12-03-fadvise enhances
>> 3 minute about elapsed time in stress environment.
>> I think it's due to reduce scanning, reclaim overhead.
>>
> Good good. This looks quite promising.

Thanks, Ben.

>
>> In no-stress enviroment, fadivse makes program little bit slow.
>> I think because there are many pgfault. I don't know why it happens.
>> Could you guess why it happens?
>>
> Hmm, nothing comes to mind. As I've said in the past, rsync should
> require each page only once. Perhaps perf might offer some insight into
> where this time is being spent?

Maybe. I will have a plan to look into that.

>
> - Ben
>



-- 
Kind regards,
Minchan Kim
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