lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:	Fri, 7 Dec 2007 16:15:54 -0600
From:	Kumar Gala <>
Cc:	Olof Johansson <>,,
	LKML <>
Subject: Re: [PATCH] Fake NUMA emulation for PowerPC

On Dec 7, 2007, at 4:12 PM, Balbir Singh wrote:

> Kumar Gala wrote:
>> On Dec 7, 2007, at 3:35 PM, Balbir Singh wrote:
>>> Olof Johansson wrote:
>>>> Hi,
>>>> On Sat, Dec 08, 2007 at 02:44:25AM +0530, Balbir Singh wrote:
>>>>> Comments are as always welcome!
>>>> Care to explain what this is useful for? (Not saying it's a  
>>>> stupid idea,
>>>> just wondering what the reason for doing it is).
>>> In my case, I use it to test parts of my memory controller patches  
>>> on an
>>> emulated NUMA machine. I plan to use it to test out page migration
>>> across nodes.
>> Can you explain that further.  I'm still not clear on why this is  
>> useful.
>> - k
> Sure. In my case I need to emulate NUMA nodes to do some NUMA specific
> testing. The memory controller I've written has some interesting data
> structures like per node, per zone LRU lists. To be able to test those
> features on a non-numa box is a problem, since we get just the  
> default node.

Maybe I'm missing something, what do you mean by memory controller  
you've written?  (I'm use to the term 'memory controller' meaning the  
actual RAM control).

> To be able to test the memory controller under NUMA, I use fake NUMA
> nodes. x86-64 has a similar feature, the code I have here is the
> simplest I could come up with for PowerPC.
> I just thought of another very interesting use case, it can be used to
> split up the zone's lru lock which is highly contended.

- k
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists