linux-kernel - Re: [PATCH] RAS: Add a tracepoint for reporting memory controller events

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Message-ID: <20120531142229.GF14515@aftab.osrc.amd.com>
Date:	Thu, 31 May 2012 16:22:29 +0200
From:	Borislav Petkov <bp@...64.org>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
Cc:	"Luck, Tony" <tony.luck@...el.com>,
	Linux Edac Mailing List <linux-edac@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Aristeu Rozanski <arozansk@...hat.com>,
	Doug Thompson <norsk5@...oo.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>
Subject: Re: [PATCH] RAS: Add a tracepoint for reporting memory controller
 events

On Thu, May 31, 2012 at 10:56:28AM -0300, Mauro Carvalho Chehab wrote:
> Em 31-05-2012 09:17, Borislav Petkov escreveu:
> > On Thu, May 31, 2012 at 07:33:25AM -0300, Mauro Carvalho Chehab wrote:
> >> Huh? Tony said that some errors report at 4K granularity while, others
> >> are at cache line size.
> > 
> > Cacheline size is from MCE. This tracepoint is for memory controller
> > errors where granularity should be pretty stable.
> 
> Both sb_edac and i7core_edac get errors via MCE. They're currently providing
> a fake granularity, but I'm planning to add proper grain support on them,
> by retrieving such information from the MCE registers.

Those are only 2 drivers and not _all_ edac drivers. For the remaining
ones grain is a pretty stable, seldomly changing value. Which means it
should be part of const char driver_detail only on those two drivers and
not a driver-global field in the tracepoint.

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Boris.

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