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SubjectRe: [PATCH] mm/rmap.c: reuse mergeable anon_vma as parent when fork
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%.

--
Wei Yang
Help you, Help me

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