linux-kernel - Re: ftruncate-mmap: pages are lost after writing to mmaped file.

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Message-ID: <alpine.LFD.2.00.0903191317220.3030@localhost.localdomain>
Date:	Thu, 19 Mar 2009 13:21:28 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Nick Piggin <nickpiggin@...oo.com.au>
cc:	Ying Han <yinghan@...gle.com>, Jan Kara <jack@...e.cz>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, guichaz@...il.com,
	Alex Khesin <alexk@...gle.com>,
	Mike Waychison <mikew@...gle.com>,
	Rohit Seth <rohitseth@...gle.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: ftruncate-mmap: pages are lost after writing to mmaped file.



On Thu, 19 Mar 2009, Linus Torvalds wrote:
> 
> Ahh, so you re-created it? On ext2 only, or is it visible on ext3 as well? 
> I've not even tested - I assumed that I would have to boot into less 
> memory and downgrade my filesystem to ext2, which made me hope somebody 
> else would pick it up first ;)

Oh, btw, can people who see this (Ying Han, Nick and apparently Jan) 
detail their configurations, please? In particular

 - SMP? (CONFIG_SMP and how many cores do you have if so?)

 - PREEMPT (NONE/VOLUNTARY or full preempt?)

 - RCU (CLASSIC/TREE/PREEMPT?)

since those affect the kinds of races we can see a lot.

			Linus
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