linux-kernel - Re: [Question] How to test (DRAM) memory location.

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Date:	Tue, 31 Aug 2010 20:59:33 -0400
From:	Calvin Walton <calvin.walton@...il.com>
To:	santosh <santosh.iitg@...il.com>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [Question] How to test (DRAM) memory location.

On Tue, 2010-08-31 at 18:07 +0530, santosh wrote:
> hi Calvin,
> 
> > There's some work done on an in-kernel memory tester, but testing memory
> > while Linux is running is somewhat limited as there are sections of
> > memory that you can't overwrite during testing. Take a look at
> > CONFIG_MEMTEST and arch/x86/mm/memtest.c (which is currently only
> > capable of testing memory in early boot).
> >
> 
> I was just looking at "linux-source-2.6.27.48" but could not find
> "memtest.c" at the location you mentioned above:
> 
> [root@...alhost linux-2.6.27.48]# cd arch/x86/mm/

This code was moved fairly recently, although I don't remember exactly
when. In the kernel version you have, it should be present in
arch/x86/mm/init_64.c
(and is only available on the 64-bit x86 architecture).

Please check a newer kernel if you can, there's been some improvements
since.

-- 
Calvin Walton <calvin.walton@...il.com>

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