linux-kernel - Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon

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Date:	Mon, 12 Apr 2010 15:11:53 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Borislav Petkov <bp@...en8.de>
cc:	Johannes Weiner <hannes@...xchg.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Rik van Riel <riel@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Nick Piggin <npiggin@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	sgunderson@...foot.com
Subject: Re: [PATCH -v2] rmap: make anon_vma_prepare link in all the anon_vmas
 of a mergeable VMA



On Mon, 12 Apr 2010, Borislav Petkov wrote:
> 
> > I have a new theory. And this new theory is completely different from all 
> > the other things we've been looking at.
> 
> Yeah, because all starts with "I have a new theory..." :o)

Hey, all my other theories made sense too.. They just didn't work.

But as Edison said: I didn't fail, I just found three other ways to not 
fix your bug.

> > The patch below is my largely mindless try at fixing this. It's untested. 
> > I'm not entirely sure that it actually works. But it makes some amount of 
> > conceptual sense. No?
> 
> Linus, are you trying to give me a heart-attack? This sh*t just survived
> 20(!) hibernation runs without a problem (well, there is this nagging
> /sysfs lockdep warning) but apart from that, it survived! I even did my
> all time best when hitting on it. Normally, it used to crap up on the
> 6th cycle as latest. Now we're rock solid. And yes, there were something
> like ~64Mb in the swap cache.
> 
> Also, I have your verification stuff in addition to the 4 patches you
> sent before. Not a single WARN_ONCE got triggered. So I have a gut
> feeling that it is fixed but you never know with these beasts.

Ok. That does sound very positive. Of course, last time you sounded 
positive, I had an email from you half an hour later that said "oh no, it 
oopsed again". So I'll take it with a bit of salt, but on the whole I'll 
be optimistic about it.

				Linus
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