On Thu, 9 Sep 2010, Mel Gorman wrote:
> @@ -1876,10 +1890,13 @@ retry:
> migratetype);
>
> /*
> - * If an allocation failed after direct reclaim, it could be because
> - * pages are pinned on the per-cpu lists. Drain them and try again
> + * If a high-order allocation failed after direct reclaim, it could
> + * be because pages are pinned on the per-cpu lists. However, only
> + * do it for PAGE_ALLOC_COSTLY_ORDER as the cost of the IPI needed
> + * to drain the pages is itself high. Assume that lower orders
> + * will naturally free without draining.
> */
> - if (!page && !drained) {
> + if (!page && !drained && order > PAGE_ALLOC_COSTLY_ORDER) {
> drain_all_pages();
> drained = true;
> goto retry;
>
This will have the effect of never sending IPIs for slab allocations since
they do not do allocations for orders > PAGE_ALLOC_COSTLY_ORDER.
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