Messages in this thread | | | Date | Tue, 5 Dec 2006 11:25:41 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH] Add __GFP_MOVABLE for callers to flag allocations that may be migrated |
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On Tue, 5 Dec 2006 08:00:39 -0800 (PST) Christoph Lameter <clameter@sgi.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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