linux-kernel - Re: [RFC] [PATCH v5 0/3] fadvise: support POSIX_FADV

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Date:	Thu, 16 Feb 2012 08:48:31 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrea Righi <andrea@...terlinux.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Johannes Weiner <jweiner@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Hugh Dickins <hughd@...gle.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Shaohua Li <shaohua.li@...el.com>,
	Pádraig Brady <P@...igBrady.com>,
	John Stultz <john.stultz@...aro.org>,
	Jerry James <jamesjer@...terlinux.com>,
	Julius Plenz <julius@...nz.com>,
	Greg Thelen <gthelen@...gle.com>,
	linux-mm <linux-mm@...ck.org>, linux-fsdevel@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC] [PATCH v5 0/3] fadvise: support POSIX_FADV_NOREUSE

On Wed, 15 Feb 2012 02:35:24 +0100
Andrea Righi <andrea@...terlinux.com> wrote:

> On Tue, Feb 14, 2012 at 03:22:20PM -0800, Andrew Morton wrote:
> > On Tue, 14 Feb 2012 23:59:22 +0100
> > Andrea Righi <andrea@...terlinux.com> wrote:
> > 
> > > On Tue, Feb 14, 2012 at 01:33:37PM -0800, Andrew Morton wrote:
> > > > On Sun, 12 Feb 2012 01:21:35 +0100
> > > > Andrea Righi <andrea@...terlinux.com> wrote: 
> > > > And yes, a container-based approach is pretty crude, and one can
> > > > envision applications which only want modified reclaim policy for one
> > > > particualr file.  But I suspect an application-wide reclaim policy
> > > > solves 90% of the problems.
> > > 
> > > I really like the container-based approach. But for this we need a
> > > better file cache control in the memory cgroup; now we have the
> > > accounting of file pages, but there's no way to limit them.
> > 
> > Again, if/whem memcg becomes sufficiently useful for this application
> > we're left maintaining the obsolete POSIX_FADVISE_NOREUSE for ever.
> 
> Yes, totally agree. For the future a memcg-based solution is probably
> the best way to go.
> 
> This reminds me to the old per-memcg dirty memory discussion
> (http://thread.gmane.org/gmane.linux.kernel.mm/67114), cc'ing Greg.
> 
> Maybe the generic feature to provide that could solve both problems is
> a better file cache isolation in memcg.
> 

Can you think of example interface for us ?
I'd like to discuss this in mm-summit if we have a chance.

Thanks,
-Kame

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