On 10/30/2012 03:18 PM, Mel Gorman wrote:
restart:
- wake_all_kswapd(order, zonelist, high_zoneidx,
+ /*
+ * kswapd is woken except when this is a THP request and compaction
+ * is deferred. If we are backing off reclaim/compaction then kswapd
+ * should not be awake aggressively reclaiming with no consumers of
+ * the freed pages
+ */
+ if (!(is_thp_alloc(gfp_mask, order) &&
+ compaction_deferred(preferred_zone, order)))
+ wake_all_kswapd(order, zonelist, high_zoneidx,
zone_idx(preferred_zone));
What is special about thp allocations here?
Surely other large allocations that keep failing
should get the same treatment, of not waking up
kswapd if compaction is deferred?
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