linux-kernel - Re: sharing page cache pages between multiple mappings

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Message-ID: <20160519105328.GJ26110@dhcp22.suse.cz>
Date:	Thu, 19 May 2016 12:53:28 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org,
	"Darrick J. Wong" <darrick.wong@...cle.com>
Subject: Re: sharing page cache pages between multiple mappings

On Thu 19-05-16 12:17:14, Miklos Szeredi wrote:
> On Thu, May 19, 2016 at 11:05 AM, Michal Hocko <mhocko@...nel.org> wrote:
> > On Thu 19-05-16 10:20:13, Miklos Szeredi wrote:
> >> Has anyone thought about sharing pages between multiple files?
> >>
> >> The obvious application is for COW filesytems where there are
> >> logically distinct files that physically share data and could easily
> >> share the cache as well if there was infrastructure for it.
> >
> > FYI this has been discussed at LSFMM this year[1]. I wasn't at the
> > session so cannot tell you any details but the LWN article covers it at
> > least briefly.
> 
> Cool, so it's not such a crazy idea.

FWIW it is ;)
-- 
Michal Hocko
SUSE Labs