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

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Message-ID: <20160519090521.GA26114@dhcp22.suse.cz>
Date:	Thu, 19 May 2016 11:05:21 +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
Subject: Re: sharing page cache pages between multiple mappings

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.

[1] https://lwn.net/Articles/684826/
-- 
Michal Hocko
SUSE Labs