linux-kernel - Re: [PATCH -v8 3/4] Enable the MS_ASYNC functionality in sys

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Date:	Wed, 23 Jan 2008 14:41:53 -0800 (PST)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Hugh Dickins <hugh@...itas.com>
cc:	Miklos Szeredi <miklos@...redi.hu>, a.p.zijlstra@...llo.nl,
	salikhmetov@...il.com, linux-mm@...ck.org, jakob@...hought.net,
	linux-kernel@...r.kernel.org, valdis.kletnieks@...edu,
	riel@...hat.com, ksm@...dk, staubach@...hat.com,
	jesper.juhl@...il.com, akpm@...ux-foundation.org,
	protasnb@...il.com, r.e.wolff@...wizard.nl,
	hidave.darkstar@...il.com, hch@...radead.org
Subject: Re: [PATCH -v8 3/4] Enable the MS_ASYNC functionality in
 sys_msync()



On Wed, 23 Jan 2008, Hugh Dickins wrote:
> 
> Something I dislike about it, though, is that it leaves the RAM-backed
> filesystems (ramfs, tmpfs, whatever) behaving visibly differently from
> the others.

I hear you. 

But I'm not seeing many alternatives, unless we start taking write faults 
on them unnecessarily. Do we care? Probably not really. 

So we certainly *could* make ramfs/tmpfs claim they do dirty accounting, 
but just having a no-op writeback. Without that, they'd need something 
really special in the file time updates.

Personally, I don't really see anybody really caring one way or the other, 
but who knows..

		Linus
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