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

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Message-Id: <E1I0ChN-0006nd-00@dorka.pomaz.szeredi.hu>
Date:	Mon, 18 Jun 2007 10:34:57 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	mingo@...e.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

> > > 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.

Miklos
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