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

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Message-Id: <E1JHcG4-0002A9-46@pomaz-ex.szeredi.hu>
Date:	Wed, 23 Jan 2008 10:51:00 +0100
From:	Miklos Szeredi <miklos@...redi.hu>
To:	miklos@...redi.hu
CC:	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,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	protasnb@...il.com, miklos@...redi.hu, 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()

> > Also, it still doesn't make sense to me why we'd not need to walk the
> > rmap, it is all the same file after all.
> 
> It's the same file, but not the same memory map.  It basically depends
> on how you define msync:
> 
>  a) sync _file_ on region defined by this mmap/start/end-address
>  b) sync _memory_region_ defined by start/end-address

My mmap/msync tester program can acually check this as well, with the
'-f' flag.  Anton, can you try that on the reference platforms?

Miklos
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