Re: [patch] mm: fix deferred congestion timeout if preferred zone is not allowed

On Wed, 19 Jan 2011, Andi Kleen wrote:

cpusets didn't exist when I designed that. But the idea was that
the kernel has a first choice ("hit") and any other node is a "miss"
that may need investigation.  So yes I would consider cpuset config as an 
intention too and should be counted as hit/miss.

Ok, so there's no additional modification that needs to be made with the 
patch (other than perhaps some more descriptive documentation of a 
NUMA_HIT and NUMA_MISS).  When the kernel passes all zones into the page 
allocator, it's relying on cpusets to reduce that zonelist to only 
allowable nodes by using ALLOC_CPUSET.  If we can allocate from the first 
zone allowed by the cpuset, it will be treated as a hit; otherwise, it 
will be treated as a miss.  That's better than treating everything as a 
miss when the cpuset doesn't include the first node.

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