linux-kernel - Re: [BUG] long freezes on thinkpad t60

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Message-ID: <20070618091832.GA1860@elte.hu>
Date:	Mon, 18 Jun 2007 11:18:32 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	cebbert@...hat.com, chris@...ee.ca, linux-kernel@...r.kernel.org,
	tglx@...utronix.de, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, kiran@...lex86.org
Subject: Re: [BUG] long freezes on thinkpad t60


* Miklos Szeredi <miklos@...redi.hu> wrote:

> > > > This change causes the memory access of the "easy" spin-loop portion 
> > > > to be more agressive: after the REP; NOP we'd not do the 'easy-loop' 
> > > > with a simple CMPB, but we'd re-attempt the atomic op.
> > > 
> > > It looks as if this is going to overflow of the lock counter, no?
> > 
> > hm, what do you mean? There's no lock counter.
> 
> I mean, the repeated calls to decb will pretty soon make lock->slock 
> wrap around.

ugh, indeed, bad thinko on my part. I'll rework this.

	Ingo
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