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SubjectRe: [PATCH 2/5] page allocator: Do not allow interrupts to use ALLOC_HARDER
On Fri, Oct 23, 2009 at 10:03:05PM -0400, Christoph Lameter wrote:
> There are now rt dependencies in the page allocator that screw things up?
>

The rt logic was present before.

> And an rt flag causes the page allocator to try harder meaning it adds
> latency.
>

The harder term in the flag is a bit misleading. The effect of ALLOC_HARDER
is that the watermark is lower for the task. i.e. a rt task is less likely
to enter direct reclaim than normal tasks so it should have less latency.

> ?
>
>

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


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