Andrew Morton wrote:

Dave McCracken wrote:

quoted

...
        daniel_rmap_speedup     Use hashed pte_chain locks

This one was shown to be a net loss on the NUMA-Q's.

But thanks for testing - I forgot to say that ;)

rmap's overhead manifests with workloads which are setting
up and tearing doen pagetables a lot.
fork/exec/exit/pagefaults/munmap/etc.  I guess forking servers
may hurt.
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