Change Details

Appealing to the kindness of Peter Holm.

Appealing to the kindness of Peter Holm for correctness testing. I've run a performance test comparing the old and new vm_map.o files with a couple of applications that map and unmap many ranges to exercise the vm_map. The changes reduce the size of the vm_map.o file on amd64 from 463080 to 455704 bytes. Each test was run 5 times on a machine configured without multiple threads with times from gettimeofday and dc-miss counts from pmcstat. For the original vm_map.c: Test 1 Test2 Seconds dc-misses Seconds dc-misses 19.723195 735959319 19.268504 742186061 19.666366 749904436 19.272552 738918198 19.670189 754166550 19.215641 735077981 19.688910 749623489 19.251053 739168849 19.723270 750328650 19.309089 736750177 For the modified vm_map.c: Test 1 Test2 Seconds dc-misses Seconds dc-misses 18.679360 682211158 17.745270 674801464 18.626152 687063686 17.689493 674667988 18.665722 680993737 17.791162 673663083 18.738495 705018224 17.763687 678144184 18.830796 731609219 17.904861 687706555 The tests 1 and 2 are uploaded here as files mapper3.c and mapper4.c. {F4651120} {F4651121}

Appealing to the kindness of Peter Holm.Holm for correctness testing. I've run a performance test comparing the old and new vm_map.o files with a couple of applications that map and unmap many ranges to exercise the vm_map. The changes reduce the size of the vm_map.o file on amd64 from 463080 to 455704 bytes. Each test was run 5 times on a machine configured without multiple threads with times from gettimeofday and dc-miss counts from pmcstat. For the original vm_map.c: Test 1 Test2 Seconds dc-misses Seconds dc-misses 19.723195 735959319 19.268504 742186061 19.666366 749904436 19.272552 738918198 19.670189 754166550 19.215641 735077981 19.688910 749623489 19.251053 739168849 19.723270 750328650 19.309089 736750177 For the modified vm_map.c: Test 1 Test2 Seconds dc-misses Seconds dc-misses 18.679360 682211158 17.745270 674801464 18.626152 687063686 17.689493 674667988 18.665722 680993737 17.791162 673663083 18.738495 705018224 17.763687 678144184 18.830796 731609219 17.904861 687706555 The tests 1 and 2 are uploaded here as files mapper3.c and mapper4.c. {F4651120} {F4651121}