Re: [Lse-tech] Rollup patch of basic rmap against 2.5.26

[Andrew M. <ak...@di...>]

Andrew Morton wrote:
> 
> Dave McCracken wrote:
> >
> > ...
> >         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.