linux-kernel - Re: [patch] sched_clock(): cleanups, #2

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Message-Id: <1180110374.31211.42.camel@imap.mvista.com>
Date:	Fri, 25 May 2007 09:26:14 -0700
From:	Daniel Walker <dwalker@...sta.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	Satyam Sharma <satyam.sharma@...il.com>,
	linux-kernel@...r.kernel.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: Re: [patch] sched_clock(): cleanups, #2

On Fri, 2007-05-25 at 09:17 -0700, Andrew Morton wrote:
> On Fri, 25 May 2007 14:15:40 +0200 Andi Kleen <andi@...stfloor.org> wrote:
> 
> > -Andi (who hopes this thread will end soon now and we can all go
> > back to more important issues)
> 
> fyi, the thread has been damn useful for me.  If Ingo hadn't spotted that
> preempt_count() imbalance then there's a decent chance that I'd have been
> the first to hit it.
> 
> Time to bisect 1,000 patches: maybe an hour, if I choose the x86 tree as
> the first pivot point, which is likely.
> 
> Or I wouldn't have hit it, in which case a tester hits it, and someone
> (guess who) gets to enter into an intercontinental head-scratching session
> trying to work out who broke it this time, consuming the tester's time too.
> Plus we have a wrecked -mm and other people's code doesn't get as
> well-tested as it might.
> 
> All for one silly little mistake.

I wonder if this was the source of the lockdep selftest failures, or the
mystery hang this patch caused (IIRC)..

Daniel

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