linux-kernel - Re: [PATCH 0/5] AMD L3 cache index disable fixes for .35

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Message-ID: <20100421204354.GA30770@aftab>
Date:	Wed, 21 Apr 2010 22:43:54 +0200
From:	Borislav Petkov <bp@...64.org>
To:	hpa@...or.com
Cc:	mingo@...e.hu, tglx@...utronix.de, x86@...nel.org,
	linux-kernel@...r.kernel.org, Frank Arnold <frank.arnold@....com>
Subject: Re: [PATCH 0/5] AMD L3 cache index disable fixes for .35

From: Borislav Petkov <bp@...64.org>
Date: Thu, Apr 15, 2010 at 06:40:58PM +0200

Ping.

It would be cool if we could sort out objections soon (in case there are
any, of course) so that the patches can have some -tip time before the
.35 merge window.

Thanks.

> From: Borislav Petkov <borislav.petkov@....com>
> 
> Hi,
> 
> this is a small patchset of fixes for L3 CID which have accumulated over
> the last couple of weeks. They serve as a preparation for disabling L3
> cache indices whenever an L3 MCE triggers, has been evaluated and the
> offending index thresholded and, if error rate is excessively high,
> disabled. Those patches will be coming up later though.
> 
> Patches 1,3,4 are cleanups and unifications which save us a little bit
> of percpu memory in favor of dynamic allocation. Also, we have an L3
> cache descriptor per node now instead of having this information per
> CPU.
> 
> I triggered a lockdep warning in lockdep_trace_alloc() during testing
> due to the fact that we may run with disabled interrupts that early
> in the boot process. Therefore, I have a GFP_ATOMIC in patch 3 there
> allocating the cache descriptors. I'm open for suggestions in case this
> is undesired.
> 
> Patch 2 is a fix which triggers when we run as a guest on Xen due to Xen
> not exporting CPU PCI config space to the guests.
> 
> And finally #5 is a required fix.
> 
> The patchset is also available at
> git://git.kernel.org/pub/scm/linux/kernel/git/bp/bp.git l3-for-35
> 
> Please queue for .35,
> thanks.
> 

-- 
Regards/Gruss,
Boris.

--
Advanced Micro Devices, Inc.
Operating Systems Research Center
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