linux-kernel - Re: [PATCH] Add __GFP_MOVABLE for callers to flag allocations that may be migrated

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Message-Id: <20061205112541.2a4b7414.akpm@osdl.org>
Date:	Tue, 5 Dec 2006 11:25:41 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Christoph Lameter <clameter@....com>
Cc:	Mel Gorman <mel@...net.ie>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] Add __GFP_MOVABLE for callers to flag allocations that
 may be migrated

On Tue, 5 Dec 2006 08:00:39 -0800 (PST)
Christoph Lameter <clameter@....com> wrote:

> On Mon, 4 Dec 2006, Andrew Morton wrote:
> 
> > > > What happens when we need to run reclaim against just a section of a zone?
> > > > Lumpy-reclaim could be used here; perhaps that's Mel's approach too?
> > > 
> > > Why would we run reclaim against a section of a zone?
> > 
> > Strange question.  Because all the pages are in use for something else.
> 
> We always run reclaim against the whole zone not against parts. Why 
> would we start running reclaim against a portion of a zone?

Oh for gawd's sake.

If you want to allocate a page from within the first 1/4 of a zone, and if
all those pages are in use for something else then you'll need to run
reclaim against the first 1/4 of that zone.  Or fail the allocation.  Or
run reclaim against the entire zone.  The second two options are
self-evidently dumb.


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