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

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Date:	Tue, 5 Dec 2006 12:01:57 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Andrew Morton <akpm@...l.org>
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, Andrew Morton wrote:

> > 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.

Yes indeed. Another failure to answer a simple question.
 
> 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.

Why would one want to allocate from the 1/4th of a zone? (Are we still 
discussing Mel's antifrag scheme or what is this about?)


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