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
