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

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Date:	Thu, 19 Mar 2009 23:16:29 +0100
From:	Jan Kara <jack@...e.cz>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Ying Han <yinghan@...gle.com>,
	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 19-03-09 13:21:28, Linus Torvalds wrote:
> 
> 
> 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
  I'm able to see it only under UML. I've tried to reproduce under normal
machine but without luck. My system is single CPU Athlon64.

>  - SMP? (CONFIG_SMP and how many cores do you have if so?)
> 
>  - PREEMPT (NONE/VOLUNTARY or full preempt?)
  Above two don't exist in UML, but I assume UML behaves basically like full
preempt SMP...

>  - RCU (CLASSIC/TREE/PREEMPT?)
  RCU is CLASSIC.

										Honza
-- 
Jan Kara <jack@...e.cz>
SUSE Labs, CR
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