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SubjectRe: objrmap and vmtruncate
"Martin J. Bligh" <> wrote:
> > objrmap does not seem to help. Page clustering might, but is unlikely to
> > be enabled on the machines which actually care about the overhead.
> eh? Not sure what you mean by that. It helped massively ...
> diffprofile from kernbench showed:
> -4666 -74.9% page_add_rmap
> -10666 -92.0% page_remove_rmap
> I'd say that about an 85% reduction in cost is pretty damned fine ;-)
> And that was about a 20% overall reduction in the system time for the
> test too ... that was all for partial objrmap (file backed, not anon).

In the test I use (my patch management scripts, which is basically bash
forking its brains out) objrmap reclaims only 30-50% of the rmap CPU

Maybe you had a very high sharing level.
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