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X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hello, kernel test robot noticed a 7.7% improvement of will-it-scale.per_thread_ops on: commit: a96ef5848cb096226bf6aff31a90d8b136d99b71 ("randomize_kstack: Unify random source across arches") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master testcase: will-it-scale config: x86_64-rhel-9.4 compiler: gcc-14 test machine: 192 threads 2 sockets Intel(R) Xeon(R) 6740E CPU @ 2.4GHz (Sierra Forest) with 256G memory parameters: nr_task: 100% mode: thread test: lseek1 cpufreq_governor: performance In addition to that, the commit also has significant impact on the following tests: +------------------+--------------------------------------------------------------+ | testcase: change | will-it-scale: will-it-scale.per_thread_ops 4.7% improvement | | test parameters | cpufreq_governor=performance | | | mode=thread | | | nr_task=100% | | | test=getppid1 | +------------------+--------------------------------------------------------------+ Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260331/202603311659.6aa92f2c-lkp@intel.com ========================================================================================= compiler/cpufreq_governor/kconfig/mode/nr_task/rootfs/tbox_group/test/testcase: gcc-14/performance/x86_64-rhel-9.4/thread/100%/debian-13-x86_64-20250902.cgz/lkp-srf-2sp2/lseek1/will-it-scale commit: 37beb42560 ("randomize_kstack: Maintain kstack_offset per task") a96ef5848c ("randomize_kstack: Unify random source across arches") 37beb42560165869 a96ef5848cb096226bf6aff31a9 ---------------- --------------------------- %stddev %change %stddev \ | \ 1.474e+09 +7.7% 1.588e+09 will-it-scale.192.threads 7675604 +7.7% 8270154 will-it-scale.per_thread_ops 1.474e+09 +7.7% 1.588e+09 will-it-scale.workload 37.77 -16.4% 31.57 vmstat.cpu.us 60.95 +6.2 67.17 mpstat.cpu.all.sys% 38.17 -6.3 31.90 mpstat.cpu.all.usr% 0.96 +17.7% 1.13 turbostat.IPC 442.92 +3.6% 459.07 turbostat.PkgWatt 0.01 ± 22% -28.9% 0.01 ± 20% perf-stat.i.MPKI 1.295e+11 +11.4% 1.442e+11 perf-stat.i.branch-instructions 7450278 ± 77% +144.3% 18200516 ± 35% perf-stat.i.branch-misses 4646936 ± 5% -10.0% 4180940 ± 5% perf-stat.i.cache-references 1.04 -15.2% 0.88 perf-stat.i.cpi 5.856e+11 +18.0% 6.907e+11 perf-stat.i.instructions 0.96 +18.0% 1.13 perf-stat.i.ipc 0.00 ± 3% -15.2% 0.00 ± 2% perf-stat.overall.MPKI 0.01 ± 77% +0.0 0.01 ± 35% perf-stat.overall.branch-miss-rate% 10.98 ± 5% +1.3 12.24 ± 5% perf-stat.overall.cache-miss-rate% 1.04 -15.3% 0.88 perf-stat.overall.cpi 0.96 +18.0% 1.13 perf-stat.overall.ipc 119899 +9.5% 131347 perf-stat.overall.path-length 1.29e+11 +11.4% 1.437e+11 perf-stat.ps.branch-instructions 7425104 ± 77% +144.1% 18126281 ± 35% perf-stat.ps.branch-misses 4734855 ± 5% -10.3% 4248990 ± 5% perf-stat.ps.cache-references 5.837e+11 +18.0% 6.885e+11 perf-stat.ps.instructions 1.767e+14 +18.0% 2.086e+14 perf-stat.total.instructions 8.77 ± 2% -8.8 0.00 perf-profile.calltrace.cycles-pp.arch_exit_to_user_mode_prepare.do_syscall_64.entry_SYSCALL_64_after_hwframe.llseek 39.72 -8.2 31.51 ± 5% perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.llseek 42.72 -8.0 34.73 ± 5% perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.llseek 26.12 -2.5 23.64 ± 4% perf-profile.calltrace.cycles-pp.__x64_sys_lseek.do_syscall_64.entry_SYSCALL_64_after_hwframe.llseek 13.12 ± 3% -1.7 11.38 ± 6% perf-profile.calltrace.cycles-pp.fdget_pos.__x64_sys_lseek.do_syscall_64.entry_SYSCALL_64_after_hwframe.llseek 7.17 ± 3% -1.4 5.74 ± 7% perf-profile.calltrace.cycles-pp.__fget_files.fdget_pos.__x64_sys_lseek.do_syscall_64.entry_SYSCALL_64_after_hwframe 4.86 -0.3 4.53 ± 4% perf-profile.calltrace.cycles-pp.mutex_unlock.__x64_sys_lseek.do_syscall_64.entry_SYSCALL_64_after_hwframe.llseek 1.39 +0.3 1.68 ± 7% perf-profile.calltrace.cycles-pp.lseek@plt 2.48 ± 2% +0.5 3.02 ± 8% perf-profile.calltrace.cycles-pp.testcase 1.20 ± 5% +1.2 2.39 ± 8% perf-profile.calltrace.cycles-pp.x64_sys_call.do_syscall_64.entry_SYSCALL_64_after_hwframe.llseek 0.00 +1.4 1.40 ± 8% perf-profile.calltrace.cycles-pp.prandom_u32_state.do_syscall_64.entry_SYSCALL_64_after_hwframe.llseek 39.88 +7.5 47.39 ± 4% perf-profile.calltrace.cycles-pp.entry_SYSCALL_64.llseek 8.77 ± 2% -8.5 0.29 ± 5% perf-profile.children.cycles-pp.arch_exit_to_user_mode_prepare 39.86 -8.2 31.69 ± 5% perf-profile.children.cycles-pp.do_syscall_64 42.77 -8.0 34.78 ± 5% perf-profile.children.cycles-pp.entry_SYSCALL_64_after_hwframe 26.26 -2.4 23.83 ± 4% perf-profile.children.cycles-pp.__x64_sys_lseek 13.22 ± 3% -1.8 11.44 ± 6% perf-profile.children.cycles-pp.fdget_pos 7.24 ± 3% -1.4 5.79 ± 7% perf-profile.children.cycles-pp.__fget_files 98.29 -0.4 97.92 perf-profile.children.cycles-pp.llseek 4.92 -0.3 4.59 ± 4% perf-profile.children.cycles-pp.mutex_unlock 0.20 ± 2% -0.0 0.18 ± 2% perf-profile.children.cycles-pp.asm_sysvec_apic_timer_interrupt 0.19 -0.0 0.16 ± 2% perf-profile.children.cycles-pp.sysvec_apic_timer_interrupt 0.18 -0.0 0.15 ± 3% perf-profile.children.cycles-pp.hrtimer_interrupt 0.18 ± 2% -0.0 0.16 ± 2% perf-profile.children.cycles-pp.__sysvec_apic_timer_interrupt 0.10 ± 3% -0.0 0.08 ± 4% perf-profile.children.cycles-pp.__hrtimer_run_queues 0.10 -0.0 0.08 ± 4% perf-profile.children.cycles-pp.tick_nohz_handler 0.08 -0.0 0.06 ± 7% perf-profile.children.cycles-pp.update_process_times 0.76 ± 2% +0.2 0.92 ± 7% perf-profile.children.cycles-pp.lseek@plt 2.43 ± 2% +0.5 2.95 ± 8% perf-profile.children.cycles-pp.testcase 1.22 ± 4% +1.2 2.45 ± 8% perf-profile.children.cycles-pp.x64_sys_call 0.00 +1.4 1.40 ± 8% perf-profile.children.cycles-pp.prandom_u32_state 26.94 +4.7 31.60 ± 4% perf-profile.children.cycles-pp.entry_SYSCALL_64 8.72 ± 2% -8.5 0.23 ± 5% perf-profile.self.cycles-pp.arch_exit_to_user_mode_prepare 7.18 ± 3% -1.4 5.78 ± 7% perf-profile.self.cycles-pp.__fget_files 4.84 -0.3 4.52 ± 4% perf-profile.self.cycles-pp.mutex_unlock 1.07 ± 3% -0.1 0.94 ± 7% perf-profile.self.cycles-pp.fdget_pos 0.06 ± 7% +0.0 0.08 ± 10% perf-profile.self.cycles-pp.lseek@plt 3.62 +0.2 3.83 ± 4% perf-profile.self.cycles-pp.do_syscall_64 1.68 ± 2% +0.4 2.05 ± 8% perf-profile.self.cycles-pp.testcase 1.16 ± 5% +1.3 2.41 ± 8% perf-profile.self.cycles-pp.x64_sys_call 0.00 +1.3 1.33 ± 8% perf-profile.self.cycles-pp.prandom_u32_state 13.18 ± 2% +1.7 14.89 ± 6% perf-profile.self.cycles-pp.entry_SYSCALL_64 18.28 +3.9 22.16 ± 5% perf-profile.self.cycles-pp.llseek *************************************************************************************************** ========================================================================================= compiler/cpufreq_governor/kconfig/mode/nr_task/rootfs/tbox_group/test/testcase: gcc-14/performance/x86_64-rhel-9.4/thread/100%/debian-13-x86_64-20250902.cgz/lkp-srf-2sp2/getppid1/will-it-scale commit: 37beb42560 ("randomize_kstack: Maintain kstack_offset per task") a96ef5848c ("randomize_kstack: Unify random source across arches") 37beb42560165869 a96ef5848cb096226bf6aff31a9 ---------------- --------------------------- %stddev %change %stddev \ | \ 1.987e+09 +4.7% 2.079e+09 will-it-scale.192.threads 10346487 +4.7% 10828131 will-it-scale.per_thread_ops 1.987e+09 +4.7% 2.079e+09 will-it-scale.workload 0.79 +20.3% 0.95 turbostat.IPC 53.28 +3.8 57.11 mpstat.cpu.all.sys% 45.85 -3.8 42.01 mpstat.cpu.all.usr% 1.111e+11 +10.2% 1.225e+11 perf-stat.i.branch-instructions 4803948 ± 2% +9.6% 5267473 ± 5% perf-stat.i.cache-references 1.27 -17.3% 1.05 perf-stat.i.cpi 4.821e+11 +21.0% 5.833e+11 perf-stat.i.instructions 0.79 +20.9% 0.95 perf-stat.i.ipc 0.00 ± 4% -18.4% 0.00 ± 3% perf-stat.overall.MPKI 0.01 ± 60% -0.0 0.00 perf-stat.overall.branch-miss-rate% 1.27 -17.3% 1.05 perf-stat.overall.cpi 0.79 +21.0% 0.95 perf-stat.overall.ipc 73248 +15.6% 84666 perf-stat.overall.path-length 1.107e+11 +10.2% 1.221e+11 perf-stat.ps.branch-instructions 4903095 ± 2% +9.2% 5356604 ± 4% perf-stat.ps.cache-references 4.806e+11 +21.0% 5.814e+11 perf-stat.ps.instructions 1.455e+14 +21.0% 1.76e+14 perf-stat.total.instructions 4.78 ± 16% -2.7 2.06 ± 5% perf-profile.calltrace.cycles-pp.syscall_return_via_sysret.getppid 5.09 ± 9% -2.5 2.58 ± 10% perf-profile.calltrace.cycles-pp.__task_pid_nr_ns.__x64_sys_getppid.do_syscall_64.entry_SYSCALL_64_after_hwframe.getppid 5.69 ± 8% -2.5 3.18 ± 10% perf-profile.calltrace.cycles-pp.__x64_sys_getppid.do_syscall_64.entry_SYSCALL_64_after_hwframe.getppid 6.88 ± 3% -2.2 4.72 ± 16% perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_safe_stack.getppid 1.36 ± 2% +1.0 2.38 ± 13% perf-profile.calltrace.cycles-pp.x64_sys_call.do_syscall_64.entry_SYSCALL_64_after_hwframe.getppid 0.00 +1.5 1.50 ± 15% perf-profile.calltrace.cycles-pp.getppid@plt 0.00 +1.9 1.88 ± 14% perf-profile.calltrace.cycles-pp.prandom_u32_state.do_syscall_64.entry_SYSCALL_64_after_hwframe.getppid 5.46 ± 17% +2.1 7.56 ± 5% perf-profile.calltrace.cycles-pp.entry_SYSRETQ_unsafe_stack.getppid 10.78 ± 5% +3.8 14.62 ± 10% perf-profile.calltrace.cycles-pp.testcase 44.13 ± 7% -5.9 38.20 ± 5% perf-profile.children.cycles-pp.entry_SYSCALL_64 4.84 ± 16% -2.7 2.16 ± 6% perf-profile.children.cycles-pp.syscall_return_via_sysret 5.85 ± 9% -2.6 3.28 ± 11% perf-profile.children.cycles-pp.__x64_sys_getppid 5.17 ± 9% -2.5 2.64 ± 11% perf-profile.children.cycles-pp.__task_pid_nr_ns 6.04 ± 3% -1.8 4.22 ± 15% perf-profile.children.cycles-pp.entry_SYSCALL_64_safe_stack 2.12 ± 10% -1.7 0.38 ± 12% perf-profile.children.cycles-pp.arch_exit_to_user_mode_prepare 98.57 -0.6 97.99 perf-profile.children.cycles-pp.getppid 0.51 ± 7% +0.3 0.83 ± 14% perf-profile.children.cycles-pp.getppid@plt 1.44 ± 2% +1.0 2.42 ± 13% perf-profile.children.cycles-pp.x64_sys_call 0.00 +1.9 1.88 ± 14% perf-profile.children.cycles-pp.prandom_u32_state 6.32 ± 5% +2.4 8.68 ± 11% perf-profile.children.cycles-pp.testcase 20.95 ± 9% +10.1 31.04 ± 9% perf-profile.children.cycles-pp.entry_SYSRETQ_unsafe_stack 23.16 ± 6% -7.0 16.11 ± 16% perf-profile.self.cycles-pp.entry_SYSCALL_64 4.79 ± 16% -2.6 2.16 ± 6% perf-profile.self.cycles-pp.syscall_return_via_sysret 5.09 ± 9% -2.5 2.60 ± 11% perf-profile.self.cycles-pp.__task_pid_nr_ns 2.04 ± 10% -1.7 0.33 ± 7% perf-profile.self.cycles-pp.arch_exit_to_user_mode_prepare 4.56 ± 3% -1.3 3.25 ± 15% perf-profile.self.cycles-pp.entry_SYSCALL_64_safe_stack 4.30 ± 2% -1.1 3.19 ± 15% perf-profile.self.cycles-pp.entry_SYSCALL_64_after_hwframe 1.40 ± 7% +0.6 1.98 ± 12% perf-profile.self.cycles-pp.testcase 1.35 ± 2% +1.0 2.35 ± 13% perf-profile.self.cycles-pp.x64_sys_call 0.00 +1.7 1.68 ± 15% perf-profile.self.cycles-pp.prandom_u32_state 20.89 ± 9% +10.1 30.94 ± 10% perf-profile.self.cycles-pp.entry_SYSRETQ_unsafe_stack 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. -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki