linux-kernel - Re: X-freeze after clflush changes [Was: 2.6.23-rc6-mm1]

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Message-ID: <10207.1190394975@turing-police.cc.vt.edu>
Date:	Fri, 21 Sep 2007 13:16:15 -0400
From:	Valdis.Kletnieks@...edu
To:	Matt Mackall <mpm@...enic.com>
Cc:	Dave Airlie <airlied@...il.com>, Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jiri Slaby <jirislaby@...il.com>, linux-kernel@...r.kernel.org
Subject: Re: X-freeze after clflush changes [Was: 2.6.23-rc6-mm1]

On Thu, 20 Sep 2007 17:06:05 CDT, Matt Mackall said:
> On Thu, Sep 20, 2007 at 11:42:29AM +1000, Dave Airlie wrote:

> > I've attached a more complicated patch that does a 2 stage effort to
> > unmapping and freeing pages. My kernel no longer hangs with this
> > patch...
> > 
> > Jiri can you confirm?
> 
> It's broken for me.
> 
> 2.6.23-rc3-mm1: solid lock on X shutdown (noticed when upgrading)
>       -rc4-mm1: solid lock on X shutdown, random solid locks about
>                 once every four hours
>       -rc6-mm1: solid lock on X startup
>    +your patch: screen goes black, turns off and on a few times during
>                 startup, can reboot with sysrq-b

Hmm.. maybe I'm chasing a different bug manifested by the same patch.  For me,
it's been a solid lockup at X startup since -rc3-mm1, and this patch doesn't
change matters.

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