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

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Message-ID: <3908561D78D1C84285E8C5FCA982C28F192F6CE1@ORSMSX104.amr.corp.intel.com>
Date:	Thu, 31 May 2012 18:14:56 +0000
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Borislav Petkov <bp@...64.org>
CC:	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

> 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.

-Tony
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