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On Fri, Aug 18, 2017 at 5:23 AM, Mel Gorman <> wrote:
> new_page = alloc_pages_node(node,

That can't make any difference. We already have:


and that "& ~__GFP_RECLAIM" is removing __GFP_DIRECT_RECLAIM.

So that patch is a no-op, afaik.

Is there something else expensive in there?

It *might* be simply that we have a shit-ton of threads, and the
thread that holds the page lock for migration is just preempted out.
even if it doesn't really do anything particularly expensive.


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