On Fri, Oct 04, 2019 at 06:15:54PM -0700, Matthew Wilcox wrote: >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! Yep, looks good :-) -- Wei Yang Help you, Help me
