linux-kernel - Re: [rfc][patch] store-free path walking

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Date:	Fri, 9 Oct 2009 06:04:53 +0200
From:	Nick Piggin <npiggin@...e.de>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Jens Axboe <jens.axboe@...cle.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org,
	Ravikiran G Thirumalai <kiran@...lex86.org>
Subject: Re: [rfc][patch] store-free path walking

On Thu, Oct 08, 2009 at 08:00:45PM +0200, Peter Zijlstra wrote:
> On Thu, 2009-10-08 at 15:30 +0200, Jens Axboe wrote:
> > 
> > IIRC, there was a bug with thread accounting very recently. Why would it
> > not hit -rc3 alone, though? Does look fishy, though.
> 
> That was caused by: 
>   def0a9b2573e00ab0b486cb5382625203ab4c4a6 sched_clock: Make it NMI safe
> 
> And was fixed by:  
>   152f9d0710a62708710161bce1b29fa8292c8c11 sched_clock: Fix
> atomicity/continuity bug by using cmpxchg64()
> 
> Which is in -rc3

Well what ever is happening here still happens with post-rc3 kernels.

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