linux-kernel - sharing page cache pages between multiple mappings

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Message-ID: <CAJfpeguD-S=CEogqcDOYAYJBzfyJG=MMKyFfpMo55bQk7d0_TQ@mail.gmail.com>
Date:	Thu, 19 May 2016 10:20:13 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org
Subject: sharing page cache pages between multiple mappings

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.

Thanks,
Miklos