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X-MS-Exchange-CrossTenant-UserPrincipalName: FXAsCbsA5uYxCZ84YEOlYaHyDQpPg+eYyYc77s9wkIxEpsKZpOsoasdr05HnY423/LWndHiR0lMj3Bbm5XdE0w== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR11MB5248 X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 3.2% improvement of stress-ng.personality.ops_per_sec on: commit: e43b8bb56e537bfc8d9076793091e7679020fc9c ("entry: Inline syscall_exit_to_user_mode()") https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git core/entry testcase: stress-ng config: x86_64-rhel-9.4 compiler: gcc-12 test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory parameters: nr_threads: 100% testtime: 60s test: personality cpufreq_governor: performance In addition to that, the commit also has significant impact on the following tests: +------------------+--------------------------------------------------------------------------------+ | testcase: change | stress-ng: stress-ng.context.swapcontext_calls_per_sec 2.1% improvement | | test machine | 384 threads 2 sockets Intel(R) Xeon(R) 6972P (Granite Rapids) with 128G memory | | test parameters | cpufreq_governor=performance | | | nr_threads=100% | | | test=context | | | testtime=60s | +------------------+--------------------------------------------------------------------------------+ Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250516/202505160902.c72854e8-lkp@intel.com ========================================================================================= compiler/cpufreq_governor/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime: gcc-12/performance/x86_64-rhel-9.4/100%/debian-12-x86_64-20240206.cgz/lkp-icl-2sp7/personality/stress-ng/60s commit: 7ace1602ab ("LoongArch: entry: Migrate ret_from_fork() to C") e43b8bb56e ("entry: Inline syscall_exit_to_user_mode()") 7ace1602abf21da5 e43b8bb56e537bfc8d907679309 ---------------- --------------------------- %stddev %change %stddev \ | \ 6.44 ±100% -6.4 0.00 perf-profile.calltrace.cycles-pp.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.personality 6.84 ±100% -6.8 0.00 perf-profile.children.cycles-pp.syscall_exit_to_user_mode 5.76 ±100% -5.8 0.00 perf-profile.self.cycles-pp.syscall_exit_to_user_mode 3.346e+08 +3.2% 3.455e+08 stress-ng.personality.ops 5577357 +3.2% 5758223 stress-ng.personality.ops_per_sec 1278 +1.5% 1297 stress-ng.time.user_time 1.31 +3.5% 1.36 perf-stat.i.cpi 1.48e+11 -3.1% 1.435e+11 perf-stat.i.instructions 0.76 -3.4% 0.74 perf-stat.i.ipc 1.31 +3.5% 1.36 perf-stat.overall.cpi 0.76 -3.4% 0.74 perf-stat.overall.ipc 1.456e+11 -3.1% 1.411e+11 perf-stat.ps.instructions 8.985e+12 -3.6% 8.659e+12 perf-stat.total.instructions 0.97 ±111% -99.9% 0.00 ±141% perf-sched.sch_delay.avg.ms.irqentry_exit_to_user_mode.asm_exc_page_fault.[unknown] 1.55 ± 4% -100.0% 0.00 perf-sched.sch_delay.avg.ms.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 1.30 ±103% -99.9% 0.00 ±141% perf-sched.sch_delay.max.ms.irqentry_exit_to_user_mode.asm_exc_page_fault.[unknown] 5.64 ± 25% -100.0% 0.00 perf-sched.sch_delay.max.ms.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 2.42 ± 37% +49.9% 3.62 ± 4% perf-sched.sch_delay.max.ms.wait_for_partner.fifo_open.do_dentry_open.vfs_open 698.88 ± 15% -40.0% 419.17 ± 20% perf-sched.wait_and_delay.avg.ms.__cond_resched.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm 3.61 ± 12% -100.0% 0.00 perf-sched.wait_and_delay.avg.ms.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 3781 ± 7% -100.0% 0.00 perf-sched.wait_and_delay.count.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 504.70 ± 98% -100.0% 0.00 perf-sched.wait_and_delay.max.ms.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 698.87 ± 15% -40.0% 419.16 ± 20% perf-sched.wait_time.avg.ms.__cond_resched.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm 2.06 ± 23% -100.0% 0.00 perf-sched.wait_time.avg.ms.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 502.38 ± 98% -100.0% 0.00 perf-sched.wait_time.max.ms.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] *************************************************************************************************** lkp-gnr-2ap2: 384 threads 2 sockets Intel(R) Xeon(R) 6972P (Granite Rapids) with 128G memory ========================================================================================= compiler/cpufreq_governor/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime: gcc-12/performance/x86_64-rhel-9.4/100%/debian-12-x86_64-20240206.cgz/lkp-gnr-2ap2/context/stress-ng/60s commit: 7ace1602ab ("LoongArch: entry: Migrate ret_from_fork() to C") e43b8bb56e ("entry: Inline syscall_exit_to_user_mode()") 7ace1602abf21da5 e43b8bb56e537bfc8d907679309 ---------------- --------------------------- %stddev %change %stddev \ | \ 49055 ± 2% -4.1% 47032 proc-vmstat.pgreuse 96.00 ± 19% -42.5% 55.17 ± 37% sched_debug.cpu.nr_uninterruptible.max 4.04 ± 70% -4.0 0.00 perf-profile.calltrace.cycles-pp.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.swapcontext 4.25 ± 70% -4.2 0.00 perf-profile.children.cycles-pp.syscall_exit_to_user_mode 3.55 ± 70% -3.6 0.00 perf-profile.self.cycles-pp.syscall_exit_to_user_mode 1.047e+08 +2.1% 1.069e+08 stress-ng.context.ops 1745421 +2.1% 1781401 stress-ng.context.ops_per_sec 4541476 +2.1% 4636071 stress-ng.context.swapcontext_calls_per_sec 9344 -1.6% 9196 stress-ng.time.system_time 13524 +1.1% 13679 stress-ng.time.user_time 0.06 ± 11% -100.0% 0.00 perf-sched.sch_delay.avg.ms.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 10.75 ± 79% -100.0% 0.00 perf-sched.sch_delay.max.ms.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 0.91 ± 97% -100.0% 0.00 perf-sched.wait_and_delay.avg.ms.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 3274 ± 2% -100.0% 0.00 perf-sched.wait_and_delay.count.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 512.24 ± 95% -100.0% 0.00 perf-sched.wait_and_delay.max.ms.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 0.86 ±104% -100.0% 0.00 perf-sched.wait_time.avg.ms.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 505.95 ± 97% -100.0% 0.00 perf-sched.wait_time.max.ms.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 1.173e+11 -3.6% 1.13e+11 perf-stat.i.branch-instructions 1.49 +0.1 1.57 perf-stat.i.branch-miss-rate% 1.727e+09 +2.3% 1.767e+09 perf-stat.i.branch-misses 2.10 +4.2% 2.19 perf-stat.i.cpi 6.241e+11 -3.6% 6.019e+11 perf-stat.i.instructions 0.48 -4.2% 0.46 perf-stat.i.ipc 1.47 +0.1 1.56 perf-stat.overall.branch-miss-rate% 2.11 +4.0% 2.19 perf-stat.overall.cpi 0.47 -3.9% 0.46 perf-stat.overall.ipc 1.154e+11 -3.6% 1.112e+11 perf-stat.ps.branch-instructions 1.698e+09 +2.3% 1.738e+09 perf-stat.ps.branch-misses 6.136e+11 -3.5% 5.919e+11 perf-stat.ps.instructions 3.804e+13 -4.6% 3.628e+13 perf-stat.total.instructions 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