Greeting, FYI, we noticed a 3.8% improvement of will-it-scale.per_thread_ops due to commit: commit: ec6aba3d2be1ed75b3f4c894bb64a36d40db1f55 ("kprobes: Remove kprobe::fault_handler") https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git perf/core in testcase: will-it-scale on test machine: 88 threads 2 sockets Intel(R) Xeon(R) Gold 6238M CPU @ 2.10GHz with 128G memory with following parameters: nr_task: 100% mode: thread test: getppid1 cpufreq_governor: performance ucode: 0x5003006 test-description: Will It Scale takes a testcase and runs it from 1 through to n parallel copies to see if the testcase will scale. It builds both a process and threads based test in order to see any differences between the two. test-url: https://github.com/antonblanchard/will-it-scale Details are as below: --------------------------------------------------------------------------------------------------> To reproduce: git clone https://github.com/intel/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp split-job --compatible job.yaml # generate the yaml file for lkp run bin/lkp run generated-yaml-file ========================================================================================= compiler/cpufreq_governor/kconfig/mode/nr_task/rootfs/tbox_group/test/testcase/ucode: gcc-9/performance/x86_64-rhel-8.3/thread/100%/debian-10.4-x86_64-20200603.cgz/lkp-csl-2sp9/getppid1/will-it-scale/0x5003006 commit: 9ce4d216fe ("uprobes: Update uprobe_write_opcode() kernel-doc comment") ec6aba3d2b ("kprobes: Remove kprobe::fault_handler") 9ce4d216fe8b581e ec6aba3d2be1ed75b3f4c894bb6 ---------------- --------------------------- %stddev %change %stddev \ | \ 7.36e+08 +3.8% 7.641e+08 will-it-scale.88.threads 8363471 +3.8% 8682920 will-it-scale.per_thread_ops 7.36e+08 +3.8% 7.641e+08 will-it-scale.workload 29916 ± 11% -13.2% 25973 ± 9% softirqs.CPU3.RCU 323.00 ± 2% +12.3% 362.83 ± 12% interrupts.CPU14.RES:Rescheduling_interrupts 4510 ± 76% -59.9% 1806 ± 8% interrupts.CPU81.CAL:Function_call_interrupts 3.828e+10 +3.8% 3.973e+10 perf-stat.i.branch-instructions 0.49 -0.2 0.25 ± 2% perf-stat.i.branch-miss-rate% 1.859e+08 -46.3% 99837696 ± 2% perf-stat.i.branch-misses 1.36 -3.7% 1.31 perf-stat.i.cpi 36366 ± 8% -13.2% 31556 ± 7% perf-stat.i.dTLB-load-misses 6.104e+10 +3.8% 6.335e+10 perf-stat.i.dTLB-loads 0.00 -0.0 0.00 ± 5% perf-stat.i.dTLB-store-miss-rate% 4.263e+10 +3.8% 4.425e+10 perf-stat.i.dTLB-stores 1.924e+08 ± 2% -36.2% 1.227e+08 ± 11% perf-stat.i.iTLB-load-misses 29467 ± 18% +3793.7% 1147349 ±214% perf-stat.i.iTLB-loads 1.782e+11 +3.8% 1.85e+11 perf-stat.i.instructions 928.95 ± 2% +68.2% 1562 ± 10% perf-stat.i.instructions-per-iTLB-miss 0.74 +3.9% 0.76 perf-stat.i.ipc 1613 +3.8% 1674 perf-stat.i.metric.M/sec 0.49 -0.2 0.25 ± 2% perf-stat.overall.branch-miss-rate% 1.36 -3.7% 1.31 perf-stat.overall.cpi 0.00 ± 13% -0.0 0.00 ± 5% perf-stat.overall.dTLB-load-miss-rate% 0.00 -0.0 0.00 ± 5% perf-stat.overall.dTLB-store-miss-rate% 926.74 ± 2% +64.7% 1526 ± 10% perf-stat.overall.instructions-per-iTLB-miss 0.74 +3.9% 0.76 perf-stat.overall.ipc 3.815e+10 +3.8% 3.96e+10 perf-stat.ps.branch-instructions 1.853e+08 -46.3% 99536406 ± 2% perf-stat.ps.branch-misses 39607 ± 13% -18.1% 32424 ± 5% perf-stat.ps.dTLB-load-misses 6.084e+10 +3.8% 6.314e+10 perf-stat.ps.dTLB-loads 4.249e+10 +3.8% 4.41e+10 perf-stat.ps.dTLB-stores 1.917e+08 ± 2% -36.2% 1.223e+08 ± 11% perf-stat.ps.iTLB-load-misses 29376 ± 18% +3795.4% 1144323 ±214% perf-stat.ps.iTLB-loads 1.776e+11 +3.8% 1.843e+11 perf-stat.ps.instructions 5.363e+13 +3.9% 5.573e+13 perf-stat.total.instructions 32.44 -2.9 29.56 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.getppid 40.06 -2.3 37.73 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.getppid 12.76 -1.9 10.84 perf-profile.calltrace.cycles-pp.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.getppid 9.08 -1.3 7.82 perf-profile.calltrace.cycles-pp.exit_to_user_mode_prepare.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.getppid 13.43 -1.2 12.24 perf-profile.calltrace.cycles-pp.__x64_sys_getppid.do_syscall_64.entry_SYSCALL_64_after_hwframe.getppid 2.23 ± 2% -0.7 1.52 perf-profile.calltrace.cycles-pp.syscall_exit_to_user_mode_prepare.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.getppid 9.04 -0.2 8.84 perf-profile.calltrace.cycles-pp.__task_pid_nr_ns.__x64_sys_getppid.do_syscall_64.entry_SYSCALL_64_after_hwframe.getppid 3.02 +0.2 3.20 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_safe_stack.getppid 2.98 +0.3 3.30 perf-profile.calltrace.cycles-pp.syscall_enter_from_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.getppid 8.84 +0.4 9.28 ± 5% perf-profile.calltrace.cycles-pp.testcase 7.14 +0.5 7.62 perf-profile.calltrace.cycles-pp.syscall_return_via_sysret.getppid 43.06 +1.5 44.54 perf-profile.calltrace.cycles-pp.__entry_text_start.getppid 33.32 -2.8 30.49 perf-profile.children.cycles-pp.do_syscall_64 40.77 -2.3 38.48 perf-profile.children.cycles-pp.entry_SYSCALL_64_after_hwframe 13.89 -1.9 11.95 perf-profile.children.cycles-pp.syscall_exit_to_user_mode 14.01 -1.3 12.75 perf-profile.children.cycles-pp.__x64_sys_getppid 9.41 -1.2 8.20 perf-profile.children.cycles-pp.exit_to_user_mode_prepare 2.44 -0.6 1.84 perf-profile.children.cycles-pp.syscall_exit_to_user_mode_prepare 9.73 -0.2 9.52 perf-profile.children.cycles-pp.__task_pid_nr_ns 1.18 -0.1 1.07 perf-profile.children.cycles-pp.rcu_read_unlock_strict 0.85 ± 2% -0.0 0.81 ± 2% perf-profile.children.cycles-pp.rcu_nocb_flush_deferred_wakeup 3.22 +0.2 3.43 perf-profile.children.cycles-pp.entry_SYSCALL_64_safe_stack 3.05 +0.3 3.38 perf-profile.children.cycles-pp.syscall_enter_from_user_mode 22.54 +0.9 23.49 perf-profile.children.cycles-pp.syscall_return_via_sysret 27.86 +1.0 28.86 perf-profile.children.cycles-pp.__entry_text_start 8.21 -1.1 7.11 perf-profile.self.cycles-pp.exit_to_user_mode_prepare 3.92 -1.0 2.91 perf-profile.self.cycles-pp.__x64_sys_getppid 2.04 ± 2% -0.6 1.47 perf-profile.self.cycles-pp.syscall_exit_to_user_mode_prepare 2.46 -0.2 2.29 perf-profile.self.cycles-pp.syscall_exit_to_user_mode 0.81 ± 2% -0.1 0.72 ± 3% perf-profile.self.cycles-pp.rcu_nocb_flush_deferred_wakeup 0.81 -0.1 0.74 perf-profile.self.cycles-pp.rcu_read_unlock_strict 2.72 +0.1 2.78 perf-profile.self.cycles-pp.do_syscall_64 3.19 +0.2 3.39 perf-profile.self.cycles-pp.entry_SYSCALL_64_safe_stack 2.38 +0.2 2.62 perf-profile.self.cycles-pp.syscall_enter_from_user_mode 12.62 +0.5 13.13 perf-profile.self.cycles-pp.__entry_text_start 7.57 +0.5 8.11 perf-profile.self.cycles-pp.entry_SYSCALL_64_after_hwframe 19.30 +0.7 20.04 perf-profile.self.cycles-pp.getppid 22.23 +0.9 23.17 perf-profile.self.cycles-pp.syscall_return_via_sysret will-it-scale.per_thread_ops 8.7e+06 +----------------------------------------------------------------+ | O O O O O | 8.65e+06 |-+ | | | 8.6e+06 |-+ | | ..+.... ..+....+ | 8.55e+06 |.. +.. : | | : | 8.5e+06 |-+ : | | : | 8.45e+06 |-+ : | | : | 8.4e+06 |-+ : | | +....+.... ..+....+.... ..| 8.35e+06 +----------------------------------------------------------------+ [*] bisect-good sample [O] bisect-bad sample Disclaimer: Results have been estimated based on internal Intel analysis and are provided for informational purposes only. Any difference in system hardware or software design or configuration may affect actual performance. --- 0DAY/LKP+ Test Infrastructure Open Source Technology Center https://lists.01.org/hyperkitty/list/lkp@lists.01.org Intel Corporation Thanks, Oliver Sang