Change Details

A kernel was modified to keep stats on the function vm_page_grab_pages_unlocked: number calls, number of cycles spent, and number of pages returned. Here are stats from running the sendfile17.sh stress test once, without and with this change in place. Without: ``` vm.stats.grab_count: 96475 1.2148055807393976 count/call vm.stats.grab_cycles: 755609782 9514.578699506397 cycles/call vm.stats.grab_calls: 79416 ``` With: ``` vm.stats.grab_count: 1026495 1.0169458782036676 count/call vm.stats.grab_cycles: 4618535619 4575.571007241998 cycles/call vm.stats.grab_calls: 1009390 ```

A kernel was modified to keep stats on the function vm_page_grab_pages_unlocked: number calls, number of cycles spent, and number of pages returned. Here are stats from running the sendfile17.sh stress test once, without and with this change in place. Without: ``` vm.stats.grab_count: 96475 1.2148055807393976 count/call vm.stats.grab_cycles: 755609782 9514.578699506397 cycles/call vm.stats.grab_calls: 79416 ``` With: ``` vm.stats.grab_count: 1026495 1.0169458782036676 count/call vm.stats.grab_cycles: 4618535619 4575.571007241998 cycles/call vm.stats.grab_calls: 1009390 ``` Numbers for running multiple consecutive buildworlds: ``` original modified Thu Oct 17 15:05:38 CDT 2024 Thu Oct 17 21:48:24 CDT 2024 56807.687u 1420.590s 1:03:23.32 56790.190u 1411.922s 1:03:22.04 vm.stats.grab_count: 4876020 vm.stats.grab_count: 4837437 vm.stats.grab_cycles: 4143819181 vm.stats.grab_cycles: 3659615758 vm.stats.grab_calls: 818112 vm.stats.grab_calls: 812842 Thu Oct 17 16:09:03 CDT 2024 Thu Oct 17 22:51:48 CDT 2024 56862.789u 1462.502s 1:03:25.71 56794.394u 1451.880s 1:03:20.05 vm.stats.grab_count: 4645138 vm.stats.grab_count: 4656055 vm.stats.grab_cycles: 4468458476 vm.stats.grab_cycles: 4032884301 vm.stats.grab_calls: 763546 vm.stats.grab_calls: 764337 Thu Oct 17 17:12:31 CDT 2024 Thu Oct 17 23:55:10 CDT 2024 56975.406u 1496.538s 1:03:30.53 56888.537u 1483.686s 1:03:28.61 vm.stats.grab_count: 4614480 vm.stats.grab_count: 4682859 vm.stats.grab_cycles: 3330967328 vm.stats.grab_cycles: 4104409778 vm.stats.grab_calls: 759291 vm.stats.grab_calls: 767468 Thu Oct 17 18:16:03 CDT 2024 Fri Oct 18 00:58:41 CDT 2024 56924.365u 1493.537s 1:03:30.28 56833.735u 1484.556s 1:03:27.67 vm.stats.grab_count: 4608861 vm.stats.grab_count: 4617088 vm.stats.grab_cycles: 3619200880 vm.stats.grab_cycles: 4221455097 vm.stats.grab_calls: 758430 vm.stats.grab_calls: 758624 Thu Oct 17 19:19:35 CDT 2024 Fri Oct 18 02:02:10 CDT 2024 56959.930u 1549.681s 1:03:30.11 56917.831u 1547.128s 1:03:32.56 vm.stats.grab_count: 4684897 vm.stats.grab_count: 4831921 vm.stats.grab_cycles: 3699821068 vm.stats.grab_cycles: 4117332546 vm.stats.grab_calls: 768036 vm.stats.grab_calls: 866469 Thu Oct 17 20:23:07 CDT 2024 57043.872u 1542.574s 1:03:38.57 vm.stats.grab_count: 4652010 vm.stats.grab_cycles: 5045539558 vm.stats.grab_calls: 764080 ```

A kernel was modified to keep stats on the function vm_page_grab_pages_unlocked: number calls, number of cycles spent, and number of pages returned. Here are stats from running the sendfile17.sh stress test once, without and with this change in place. Without: ``` vm.stats.grab_count: 96475 1.2148055807393976 count/call vm.stats.grab_cycles: 755609782 9514.578699506397 cycles/call vm.stats.grab_calls: 79416 ``` With: ``` vm.stats.grab_count: 1026495 1.0169458782036676 count/call vm.stats.grab_cycles: 4618535619 4575.571007241998 cycles/call vm.stats.grab_calls: 1009390 ``` Numbers for running multiple consecutive buildworlds: ``` original modified Thu Oct 17 15:05:38 CDT 2024 Thu Oct 17 21:48:24 CDT 2024 56807.687u 1420.590s 1:03:23.32 56790.190u 1411.922s 1:03:22.04 vm.stats.grab_count: 4876020 vm.stats.grab_count: 4837437 vm.stats.grab_cycles: 4143819181 vm.stats.grab_cycles: 3659615758 vm.stats.grab_calls: 818112 vm.stats.grab_calls: 812842 Thu Oct 17 16:09:03 CDT 2024 Thu Oct 17 22:51:48 CDT 2024 56862.789u 1462.502s 1:03:25.71 56794.394u 1451.880s 1:03:20.05 vm.stats.grab_count: 4645138 vm.stats.grab_count: 4656055 vm.stats.grab_cycles: 4468458476 vm.stats.grab_cycles: 4032884301 vm.stats.grab_calls: 763546 vm.stats.grab_calls: 764337 Thu Oct 17 17:12:31 CDT 2024 Thu Oct 17 23:55:10 CDT 2024 56975.406u 1496.538s 1:03:30.53 56888.537u 1483.686s 1:03:28.61 vm.stats.grab_count: 4614480 vm.stats.grab_count: 4682859 vm.stats.grab_cycles: 3330967328 vm.stats.grab_cycles: 4104409778 vm.stats.grab_calls: 759291 vm.stats.grab_calls: 767468 Thu Oct 17 18:16:03 CDT 2024 Fri Oct 18 00:58:41 CDT 2024 56924.365u 1493.537s 1:03:30.28 56833.735u 1484.556s 1:03:27.67 vm.stats.grab_count: 4608861 vm.stats.grab_count: 4617088 vm.stats.grab_cycles: 3619200880 vm.stats.grab_cycles: 4221455097 vm.stats.grab_calls: 758430 vm.stats.grab_calls: 758624 Thu Oct 17 19:19:35 CDT 2024 Fri Oct 18 02:02:10 CDT 2024 56959.930u 1549.681s 1:03:30.11 56917.831u 1547.128s 1:03:32.56 vm.stats.grab_count: 4684897 vm.stats.grab_count: 4831921 vm.stats.grab_cycles: 3699821068 vm.stats.grab_cycles: 4117332546 vm.stats.grab_calls: 768036 vm.stats.grab_calls: 866469 Thu Oct 17 20:23:07 CDT 2024 57043.872u 1542.574s 1:03:38.57 vm.stats.grab_count: 4652010 vm.stats.grab_cycles: 5045539558 vm.stats.grab_calls: 764080 ```