linux-kernel - Re: Move to unshared VMAs in NOMMU mode?

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Message-ID: <m1wt1dvxzu.fsf@ebiederm.dsl.xmission.com>
Date:	Mon, 19 Mar 2007 13:23:17 -0600
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	David Howells <dhowells@...hat.com>
Cc:	Hugh Dickins <hugh@...itas.com>, bryan.wu@...log.com,
	Robin Holt <holt@....com>,
	"Kawai, Hidehiro" <hidehiro.kawai.ez@...achi.com>,
	Andrew Morton <akpm@...l.org>,
	kernel list <linux-kernel@...r.kernel.org>,
	Pavel Machek <pavel@....cz>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	sugita <yumiko.sugita.yf@...achi.com>,
	Satoshi OSHIMA <soshima@...hat.com>, haoki@...hat.com,
	Robin Getz <rgetz@...ckfin.uclinux.org>
Subject: Re: Move to unshared VMAs in NOMMU mode?

I'm just trying to digest this a little.

As I understand your description for non-shared mappings the VMAs are
per process.

For shared mappings you share in some sense the page cache.

My gut feel says just keep a vma per process of the regions the
process has and do the appropriate book keeping and all will be fine.

For shm_nattach it looks like you simply are not calling the
open/close methods on fork (because you have a shared pool of vmas).

Eric
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