Date: Fri, 9 Oct 2009 06:04:53 +0200
From: Nick Piggin <npiggin@suse.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: Jens Axboe <jens.axboe@oracle.com>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       linux-fsdevel@vger.kernel.org,
       Ravikiran G Thirumalai <kiran@scalex86.org>
Subject: Re: [rfc][patch] store-free path walking
Message-ID: <20091009040453.GA2983@wotan.suse.de>
References: <20091006101414.GM5216@kernel.dk> <20091006122623.GE30316@wotan.suse.de> <20091006124941.GS5216@kernel.dk> <20091007085849.GN30316@wotan.suse.de> <alpine.LFD.2.01.0910070742260.3432@localhost.localdomain> <20091008123622.GA30316@wotan.suse.de> <20091008125746.GL9228@kernel.dk> <20091008132200.GB30316@wotan.suse.de> <20091008133003.GM9228@kernel.dk> <1255024846.26976.329.camel@twins>
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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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