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

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Message-ID: <20120531192644.GA16998@aftab.osrc.amd.com>
Date:	Thu, 31 May 2012 21:26:44 +0200
From:	Borislav Petkov <bp@...64.org>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Borislav Petkov <bp@...64.org>,
	Mauro Carvalho Chehab <mchehab@...hat.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 06:14:56PM +0000, Luck, Tony wrote:
> > Ok, thus the dynamic granularity. But we're going to end up reporting
> > rank and row too so that it can be matched to the DIMM. I consider
> > physical address a bonus in such cases and it is only of importance to
> > those who like to replace single DRAM chips or single MOSFET transistors
> > :-) :-) :-).
> 
> Perhaps you don't really need to replace your 32GB DIMM because a single
> bit is stuck (one bad bit out of > 300 billion). With the physical address
> we can tell Linux to try to stop using the page that contains the stuck
> bit - most of the time it can do that.

Yes, ok, that is a good example for using the physical address.
Provided, of course, the reported granularity still keeps us within the
page that contained the error. But I think you said earlier that most of
the errors are reported with 4K granularity, so all is fine.

-- 
Regards/Gruss,
Boris.

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