linux-kernel - Re: [PATCH 6/6] Use one zonelist that is filtered by nodemask

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Message-ID: <Pine.LNX.4.64.0710091146360.32162@schroedinger.engr.sgi.com>
Date:	Tue, 9 Oct 2007 11:47:10 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Nishanth Aravamudan <nacc@...ibm.com>
cc:	Mel Gorman <mel@...net.ie>, akpm@...ux-foundation.org,
	Lee.Schermerhorn@...com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, rientjes@...gle.com,
	kamezawa.hiroyu@...fujitsu.com
Subject: Re: [PATCH 6/6] Use one zonelist that is filtered by nodemask

On Tue, 9 Oct 2007, Nishanth Aravamudan wrote:

> > > And nodemask_thisnode() always gives us a nodemask with only the node
> > > the current process is running on set, I think?
> > > 
> > 
> > Yes, I interpreted THISNODE to mean "this node I am running on".
> > Callers seemed to expect this but the memoryless needs it to be "this
> > node I am running on unless I specify a node in which case I mean that
> > node.".
> 
> I think that is only true (THISNODE = local node) if the callpath is not
> via alloc_pages_node(). If the callpath is via alloc_pages_node(), then
> it depends on whether the nid parameter is -1 (in which case it is also
> local node) or anything (in which case it is the nid specified). Ah,
> reading further along, that's exactly what your changelog indicates too
> :)

Right. THISNODE means the node we are on or the node that we indicated we 
want to allocate from. 

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