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

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Message-Id: <E1I0CY4-0006lF-00@dorka.pomaz.szeredi.hu>
Date:	Mon, 18 Jun 2007 10:25:20 +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
Subject: Re: [BUG] long freezes on thinkpad t60

> To test this theory, could you try the patch below, does this fix your 
> hangs too?

Not tried yet, but obviously it does, since it's a superset of the
previous fix.  I could try without the smb_mb(), but see below.

> 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?

Miklos
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