linux-kernel - Re: [PATCH 20/35] Use a pre-calculated value for num_online

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Message-ID: <20090319230445.GG24586@csn.ul.ie>
Date:	Thu, 19 Mar 2009 23:04:45 +0000
From:	Mel Gorman <mel@....ul.ie>
To:	Christoph Lameter <cl@...ux-foundation.org>
Cc:	Linux Memory Management List <linux-mm@...ck.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Rik van Riel <riel@...hat.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Nick Piggin <npiggin@...e.de>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Lin Ming <ming.m.lin@...el.com>,
	Zhang Yanmin <yanmin_zhang@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>
Subject: Re: [PATCH 20/35] Use a pre-calculated value for num_online_nodes()

On Thu, Mar 19, 2009 at 06:24:02PM -0400, Christoph Lameter wrote:
> On Thu, 19 Mar 2009, Mel Gorman wrote:
> 
> > On Thu, Mar 19, 2009 at 04:43:55PM -0400, Christoph Lameter wrote:
> > > Trying to the same in the style of nr_node_ids etc.
> > >
> >
> > Because of some issues with the patch and what it does for possible
> > nodes, I reworked the patch slightly into the following and is what I'm
> > actually testing.
> 
> Ok. It also removes the slab bits etc.
> 

Well ... yes.

One of the slab changes removed a variable called numa_platform. From your
patch, this appears to have some relation to nr_possible_nodes but it's not
obvious at all if that is true or not.

The second change replaced num_possible_nodes() with nr_possible_nodes()
but it wasn't clear this was equivalent because nr_possible_nodes()
doesn't get updated from the call sites affecting the "possible" bitmap.

Both of those changes belong in a different patch and need explaination.
The bits left alter just nr_online_nodes and use it where it's
important.

-- 
Mel Gorman
Part-time Phd Student                          Linux Technology Center
University of Limerick                         IBM Dublin Software Lab
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