Regression in 2.6.18-rc2-mm1: mbind() not binding

Just a heads up: it appears that mbind() does not work--e.g. on anonymous pages--in 2.6.18-rc2-mm1.

Found with my memtoy tool, available at:
http://free.linux.hp.com/~lts/Tools/memtoy-latest.tar.gz

Requires a NUMA platform or fakenuma kernel to see this. I'm not sure yet whether the specified policy is not being installed, or it's just being ignored at allocation time. Note that default policy works: when I change the cpu/node affinity of the test, allocation tracks to new node. This indicates that get_mempolicy(..., MPOL_F_NODE|MPOL_F_ADDR) isn't lying to me.

Works in 2.6.18-rc2. I've just grabbed the broken out series, and will attempt to isolate the patch. If anyone else has come across this and already knows what's causing it--that would save me some effort.

Lee

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Update: looks like only the MPOL_BIND policy is affected. Preferred and Interleaved seem to work. Maybe something to do with zone lists? Still investigating.

Lee

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