linux-kernel - Re: fadvise DONTNEED implementation (or lack thereof)

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Message-ID: <AANLkTi=tZkRnbDhqx=V5TwKh9S1SouEqO5pU_9C-kope@mail.gmail.com>
Date:	Mon, 15 Nov 2010 16:46:18 +0900
From:	Minchan Kim <minchan.kim@...il.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Cc:	Ben Gamari <bgamari.foss@...il.com>, linux-kernel@...r.kernel.org,
	rsync@...ts.samba.org, linux-mm@...ck.org,
	Peter Zijlstra <peterz@...radead.org>,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: fadvise DONTNEED implementation (or lack thereof)

On Mon, Nov 15, 2010 at 4:28 PM, KOSAKI Motohiro
<kosaki.motohiro@...fujitsu.com> wrote:
>> On Mon, Nov 15, 2010 at 4:09 PM, KOSAKI Motohiro
>> <kosaki.motohiro@...fujitsu.com> wrote:
>> >> > Because we have an alternative solution already. please try memcgroup :)
>> >>
>> >> I think memcg could be a solution of them but fundamental solution is
>> >> that we have to cure it in VM itself.
>> >> I feel it's absolutely absurd to enable and use memcg for amending it.
>> >>
>> >> I wonder what's the problem in Peter's patch 'drop behind'.
>> >> http://www.mail-archive.com/linux-kernel@vger.kernel.org/msg179576.html
>> >>
>> >> Could anyone tell me why it can't accept upstream?
>> >
>> > I don't know the reason. And this one looks reasonable to me. I'm curious the above
>> > patch solve rsync issue or not.
>> > Minchan, have you tested it yourself?
>>
>> Still yet. :)
>> If we all think it's reasonable, it would be valuable to adjust it
>> with current mmotm and see the effect.
>
> Who can make rsync like io pattern test suite? a code change is easy. but
> to comfirm justification is more harder work.

Maybe Ben, Brian those reports the problem. :)



-- 
Kind regards,
Minchan Kim
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