linux-kernel - Re: marching through all physical memory in software

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Message-ID: <497F5289.404@nortel.com>
Date:	Tue, 27 Jan 2009 12:29:29 -0600
From:	"Chris Friesen" <cfriesen@...tel.com>
To:	Arjan van de Ven <arjan@...radead.org>
CC:	linux-kernel@...r.kernel.org
Subject: Re: marching through all physical memory in software

Arjan van de Ven wrote:
> On Mon, 26 Jan 2009 09:38:13 -0600
> "Chris Friesen" <cfriesen@...tel.com> wrote:
> 
>> Someone is asking me about the feasability of "scrubbing" system
>> memory by accessing each page and handling the ECC faults.
>>
> 
> Hi,
> 
> I would suggest that you look at the "edac" subsystem, which tries to
> do exactly this....

Looking at the current -git code, there appears to be an option for 
memory controllers to do this (the set_sdram_scrub_rate() routine), but 
there don't appear to be any controllers that can actually do it.

edac appears to currently be able to scrub the specific page where the 
fault occurred.  This is a useful building block, but doesn't provide 
the ability to march through all of physical memory.

Chris

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