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SubjectRe: [PATCH] mm/rmap.c: reuse mergeable anon_vma as parent when fork
On Sat, Oct 05, 2019 at 07:48:45AM +0800, Wei Yang wrote:
> On Fri, Oct 04, 2019 at 09:11:20AM -0700, Matthew Wilcox wrote:
> >On Sat, Oct 05, 2019 at 12:06:32AM +0800, Wei Yang wrote:
> >> After this change, kernel build test reduces 20% anon_vma allocation.
> >
> >But does it have any effect on elapsed time or peak memory consumption?
>
> Do the same kernel build test and record time:
>
>
> Origin
>
> real 2m50.467s
> user 17m52.002s
> sys 1m51.953s
>
> real 2m48.662s
> user 17m55.464s
> sys 1m50.553s
>
> real 2m51.143s
> user 17m59.687s
> sys 1m53.600s
>
>
> Patched
>
> real 2m43.733s
> user 17m25.705s
> sys 1m41.791s
>
> real 2m47.146s
> user 17m47.451s
> sys 1m43.474s
>
> real 2m45.763s
> user 17m38.230s
> sys 1m42.102s
>
>
> For time in sys, it reduced 8.5%.

That's compelling!

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