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

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Message-Id: <20101115162713.BF12.A69D9226@jp.fujitsu.com>
Date:	Mon, 15 Nov 2010 16:28:32 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Minchan Kim <minchan.kim@...il.com>
Cc:	kosaki.motohiro@...fujitsu.com,
	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 4:09 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.



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