linux-kernel - Re: [BUG][PATCH] fix mempolcy's check on a system with memory-less-node take2

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Message-Id: <20070208171610.d1bea5d2.kamezawa.hiroyu@jp.fujitsu.com>
Date:	Thu, 8 Feb 2007 17:16:10 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andi Kleen <ak@...e.de>
Cc:	linux-kernel@...r.kernel.org, clameter@....com, akpm@...l.org,
	y-goto@...fujitsu.com
Subject: Re: [BUG][PATCH] fix mempolcy's check on a system with
 memory-less-node take2

On Thu, 8 Feb 2007 08:49:41 +0100
Andi Kleen <ak@...e.de> wrote:

> 
> > This panic(hang) was found by a numa test-set on a system with 3 nodes, where
> > node(2) was memory-less-node.
> 
> I still think it's the wrong fix -- just get rid of the memory less node.
> I expect you'll likely run into more problems with that setup anyways.
> 
memory-less-node problem is a bit big issue for this small bug.

For removing memory-less-node, we'll have to make consensus on 
"a node represents a group of memory, not cpu, not devices"

I read old e-mails on node-hotplug again.
In the early stage of node-hotplug, I assumes "a node has memory".
After discussion between several groups, I knew there are people
who consider groups of something as node.
(and we had to change our plan......)
like this (old) homepage's FAQ 5. http://lse.sourceforge.net/numa/faq/


> >  static struct mempolicy *mpol_new(int mode, nodemask_t *nodes)
> >  {
> >  	struct mempolicy *policy;
> > +	void  *val;
> 
> Using void * here is nasty when it's a zonelist pointer.
> 
okay. changes this to be more neat one..take3 will come.

-Kame




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