On Fri, 27 Feb 2015, David Rientjes wrote:

+/*
+ * Construct gfp mask to allocate from a specific node but do not invoke reclaim
+ * or warn about failures.
+ */

We should be triggering reclaim from slab allocations. Why would we not do
this?

Otherwise we will be going uselessly off node for slab allocations.

+static inline gfp_t gfp_exact_node(gfp_t flags)
+{
+	return (flags | __GFP_THISNODE | __GFP_NOWARN) & ~__GFP_WAIT;
+}
 #endif

Reclaim needs to be triggered. In particular zone reclaim was made to be
triggered from slab allocations to create more room if needed.

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