RE: Testing RAM from userspace / question about memmap= arguments

[Richard D]

Cant you, modify bootmem allocator to test with memtest patterns and then
use kexec (as Pavel suggested) to test the one where kernel was sitting
earlier?

-----Original Message-----
From: linux-kernel-owner@xxxxxxxxxxxxxxx
[mailto:linux-kernel-owner@xxxxxxxxxxxxxxx] On Behalf Of Pavel Machek
Sent: Friday, December 21, 2007 6:28 PM
To: Matthew Bloch
Cc: linux-kernel@xxxxxxxxxxxxxxx
Subject: Re: Testing RAM from userspace / question about memmap= arguments

On Tue 2007-12-18 17:06:24, Matthew Bloch wrote:
> Hi - I'm trying to come up with a way of thoroughly testing every byte
> of RAM from within Linux on amd64 (so that it can be automated better
> than using memtest86+), and came up with an idea which I'm not sure is
> supported or practical.
> 
> The obvious problem with testing memory from user space is that you
> can't mlock all of it, so the best you can do is about three quarters,
> and hope that the rest of the memory is okay.
> 
> In order to test all of the memory, I'd like to run the user-space
> memtester over two boots of the kernel.
> 
> Say we have a 1024MB machine, the first boot I'd not specify any
> arguments and assume the kernel would start at the bottom of physical
> memory and work its way up, so that the kernel & working userspace would
> live at the bottom, and the rest would be testable from space.
> 
> On the second boot, could I then specify:
> 
> memmap=exact memmap=512M@512M memmap=512M@0

Actually, with kexec, you can probably doing without reboot.

							Pavel
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