On Wed, 2008-02-27 at 14:00 -0800, Christoph Lameter wrote:

quoted

This patch records what the preferred zone is rather than assuming the
first zone in the zonelist is it. This simplifies the reading of later
patches in this set.

And is needed for correctness if GFP_THISNODE is used?

Mel can correct me.  

I believe this is needed for MPOL_BIND allocations because we now use
the zonelist for the local node--i.e., the node from which the
allocation takes place--and search for the nearest node in the policy
nodemask that satisfies the allocation.  For the purpose of numa stats,
a "numa_hit" occurs if the allocation succeeds on the first node in the
zone list that is also in the policy nodemask--this is the "preferred
node".

Lee

Reviewed-by: Christoph Lameter <redacted>

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