To: miklos@szeredi.hu
CC: a.p.zijlstra@chello.nl, salikhmetov@gmail.com, linux-mm@kvack.org,
       jakob@unthought.net, linux-kernel@vger.kernel.org,
       valdis.kletnieks@vt.edu, riel@redhat.com, ksm@42.dk,
       staubach@redhat.com, jesper.juhl@gmail.com,
       torvalds@linux-foundation.org, akpm@linux-foundation.org,
       protasnb@gmail.com, miklos@szeredi.hu, r.e.wolff@bitwizard.nl,
       hidave.darkstar@gmail.com, hch@infradead.org
In-reply-to: <E1JHc0S-00027S-8D@pomaz-ex.szeredi.hu> (message from Miklos
	Szeredi on Wed, 23 Jan 2008 10:34:52 +0100)
Subject: Re: [PATCH -v8 3/4] Enable the MS_ASYNC functionality in
	sys_msync()
References: <12010440803930-git-send-email-salikhmetov@gmail.com>
	 <1201044083504-git-send-email-salikhmetov@gmail.com>
	 <1201078035.6341.45.camel@lappy> <1201078278.6341.47.camel@lappy> <E1JHc0S-00027S-8D@pomaz-ex.szeredi.hu>
Message-Id: <E1JHcG4-0002A9-46@pomaz-ex.szeredi.hu>
From: Miklos Szeredi <miklos@szeredi.hu>
Date: Wed, 23 Jan 2008 10:51:00 +0100
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 736
Lines: 18

> > 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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