On Thursday 02 August 2007 19:21:18 Mel Gorman wrote: > The NUMA layer only supports NUMA policies for the highest zone. When > ZONE_MOVABLE is configured with kernelcore=, the the highest zone becomes > ZONE_MOVABLE. The result is that policies are only applied to allocations > like anonymous pages and page cache allocated from ZONE_MOVABLE when the > zone is used. > > This patch applies policies to the two highest zones when the highest zone > is ZONE_MOVABLE. As ZONE_MOVABLE consists of pages from the highest "real" > zone, it's always functionally equivalent. > > The patch has been tested on a variety of machines both NUMA and non-NUMA > covering x86, x86_64 and ppc64. No abnormal results were seen in kernbench, > tbench, dbench or hackbench. It passes regression tests from the numactl > package with and without kernelcore= once numactl tests are patched to > wait for vmstat counters to update. I must honestly say I really hate the patch. It's a horrible hack and makes fast paths slower. When I designed mempolicies I especially tried to avoid things like that, please don't add them through the backdoor now.
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