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Thu, 23 Oct 2025 07:26:23 +0000 Date: Thu, 23 Oct 2025 15:26:05 +0800 From: kernel test robot To: Tim Chen CC: , , Chen Yu , Tim Chen , , , , Peter Zijlstra , Ingo Molnar , K Prateek Nayak , "Gautham R . Shenoy" , Vincent Guittot , Juri Lelli , Dietmar Eggemann , "Steven Rostedt" , Ben Segall , Mel Gorman , Valentin Schneider , "Madadi Vineeth Reddy" , Hillf Danton , "Shrikanth Hegde" , Jianyong Wu , "Yangyu Chen" , Tingyin Duan , Vern Hao , Len Brown , Aubrey Li , Zhao Liu , Chen Yu , Libo Chen , Adam Li , Tim Chen , Subject: Re: [PATCH 01/19] sched/fair: Add infrastructure for cache-aware load balancing Message-ID: <202510231459.ad690ecd-lkp@intel.com> Content-Type: text/plain; charset="iso-8859-1" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <865b852e3fdef6561c9e0a5be9a94aec8a68cdea.1760206683.git.tim.c.chen@linux.intel.com> X-ClientProxiedBy: KL1P15301CA0066.APCP153.PROD.OUTLOOK.COM (2603:1096:820:3d::14) To LV3PR11MB8603.namprd11.prod.outlook.com (2603:10b6:408:1b6::9) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: 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X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Oct 2025 07:26:23.3439 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: T5vtzSuL0cWFjCBuHiyTNntkJfRzEueCY46HjlyB/KFjRfL0pJ6xg+f8xp65S9odbNaFJ9fR/pcNxJGyS7TEXA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR11MB5312 X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 5.1% improvement of will-it-scale.per_thread_ops on: commit: ddf7df94672b42db9a86b3225cf9ebcfdfefc506 ("[PATCH 01/19] sched/fair: Add infrastructure for cache-aware load balancing") url: https://github.com/intel-lab-lkp/linux/commits/Tim-Chen/sched-fair-Add-infrastructure-for-cache-aware-load-balancing/20251012-022248 base: https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git 45b7f780739a3145aeef24d2dfa02517a6c82ed6 patch link: https://lore.kernel.org/all/865b852e3fdef6561c9e0a5be9a94aec8a68cdea.1760206683.git.tim.c.chen@linux.intel.com/ patch subject: [PATCH 01/19] sched/fair: Add infrastructure for cache-aware load balancing testcase: will-it-scale config: x86_64-rhel-9.4 compiler: gcc-14 test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory parameters: nr_task: 100% mode: thread test: mmap1 cpufreq_governor: performance Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20251023/202510231459.ad690ecd-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-icl-2sp7/mmap1/will-it-scale commit: 45b7f78073 ("sched: Fix some typos in include/linux/preempt.h") ddf7df9467 ("sched/fair: Add infrastructure for cache-aware load balancing") 45b7f780739a3145 ddf7df94672b42db9a86b3225cf ---------------- --------------------------- %stddev %change %stddev \ | \ 12.30 ± 4% +1.2 13.54 ± 2% turbostat.C6% 16510 ± 2% +11.0% 18333 ± 5% perf-c2c.HITM.local 14007 ± 2% +11.9% 15670 ± 5% perf-c2c.HITM.remote 30518 ± 2% +11.4% 34003 ± 5% perf-c2c.HITM.total 4216 ±117% -82.9% 720.83 ± 87% sched_debug.cfs_rq:/.load_avg.max 230030 ± 6% +21.9% 280349 ± 3% sched_debug.cpu.nr_switches.min 32696287 +100.0% 65398751 sched_debug.sysctl_sched.sysctl_sched_features 71075 +5.1% 74710 will-it-scale.64.threads 1109 +5.1% 1166 will-it-scale.per_thread_ops 71075 +5.1% 74710 will-it-scale.workload 20012272 +1.8% 20374679 perf-stat.i.branch-misses 20662368 +4.4% 21568525 perf-stat.i.cache-references 181255 ± 6% +10.5% 200376 ± 2% perf-stat.i.context-switches 177.39 +5.8% 187.65 perf-stat.i.cpu-migrations 22226 ± 3% -5.9% 20924 ± 2% perf-stat.i.cycles-between-cache-misses 2.83 ± 6% +10.5% 3.13 ± 2% perf-stat.i.metric.K/sec 0.26 +0.0 0.27 perf-stat.overall.branch-miss-rate% 1.609e+08 -5.6% 1.518e+08 perf-stat.overall.path-length 19825311 +1.9% 20209803 perf-stat.ps.branch-misses 20712472 +4.4% 21614327 perf-stat.ps.cache-references 180352 ± 6% +10.5% 199276 ± 2% perf-stat.ps.context-switches 177.05 +5.8% 187.32 perf-stat.ps.cpu-migrations 47.47 -0.1 47.36 perf-profile.calltrace.cycles-pp.osq_lock.rwsem_down_write_slowpath.down_write_killable.__vm_munmap.__x64_sys_munmap 48.49 -0.1 48.40 perf-profile.calltrace.cycles-pp.down_write_killable.__vm_munmap.__x64_sys_munmap.do_syscall_64.entry_SYSCALL_64_after_hwframe 48.39 -0.1 48.30 perf-profile.calltrace.cycles-pp.down_write_killable.vm_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap 47.36 -0.1 47.27 perf-profile.calltrace.cycles-pp.osq_lock.rwsem_down_write_slowpath.down_write_killable.vm_mmap_pgoff.do_syscall_64 48.44 -0.1 48.35 perf-profile.calltrace.cycles-pp.rwsem_down_write_slowpath.down_write_killable.__vm_munmap.__x64_sys_munmap.do_syscall_64 48.34 -0.1 48.25 perf-profile.calltrace.cycles-pp.rwsem_down_write_slowpath.down_write_killable.vm_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe 49.70 -0.1 49.62 perf-profile.calltrace.cycles-pp.__x64_sys_munmap.do_syscall_64.entry_SYSCALL_64_after_hwframe.__munmap 49.70 -0.1 49.62 perf-profile.calltrace.cycles-pp.__vm_munmap.__x64_sys_munmap.do_syscall_64.entry_SYSCALL_64_after_hwframe.__munmap 49.71 -0.1 49.64 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.__munmap 49.73 -0.1 49.66 perf-profile.calltrace.cycles-pp.__munmap 49.71 -0.1 49.64 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.__munmap 49.11 -0.1 49.06 perf-profile.calltrace.cycles-pp.vm_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap 0.52 +0.0 0.54 perf-profile.calltrace.cycles-pp.vms_gather_munmap_vmas.do_vmi_align_munmap.do_vmi_munmap.__vm_munmap.__x64_sys_munmap 0.54 ± 2% +0.0 0.56 perf-profile.calltrace.cycles-pp.do_mmap.vm_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap 0.67 ± 3% +0.1 0.74 ± 2% perf-profile.calltrace.cycles-pp.cpuidle_enter_state.cpuidle_enter.cpuidle_idle_call.do_idle.cpu_startup_entry 0.68 ± 3% +0.1 0.74 ± 2% perf-profile.calltrace.cycles-pp.cpuidle_enter.cpuidle_idle_call.do_idle.cpu_startup_entry.start_secondary 0.71 ± 3% +0.1 0.78 ± 2% perf-profile.calltrace.cycles-pp.cpuidle_idle_call.do_idle.cpu_startup_entry.start_secondary.common_startup_64 0.99 ± 3% +0.1 1.10 ± 2% perf-profile.calltrace.cycles-pp.common_startup_64 0.97 ± 3% +0.1 1.08 ± 2% perf-profile.calltrace.cycles-pp.do_idle.cpu_startup_entry.start_secondary.common_startup_64 0.97 ± 3% +0.1 1.08 ± 2% perf-profile.calltrace.cycles-pp.cpu_startup_entry.start_secondary.common_startup_64 0.97 ± 3% +0.1 1.08 ± 2% perf-profile.calltrace.cycles-pp.start_secondary.common_startup_64 94.85 -0.2 94.65 perf-profile.children.cycles-pp.osq_lock 96.81 -0.2 96.64 perf-profile.children.cycles-pp.rwsem_down_write_slowpath 96.87 -0.2 96.70 perf-profile.children.cycles-pp.down_write_killable 98.91 -0.1 98.80 perf-profile.children.cycles-pp.do_syscall_64 98.91 -0.1 98.80 perf-profile.children.cycles-pp.entry_SYSCALL_64_after_hwframe 49.70 -0.1 49.62 perf-profile.children.cycles-pp.__x64_sys_munmap 49.70 -0.1 49.62 perf-profile.children.cycles-pp.__vm_munmap 49.73 -0.1 49.66 perf-profile.children.cycles-pp.__munmap 0.05 +0.0 0.06 perf-profile.children.cycles-pp.wake_q_add 0.23 +0.0 0.24 perf-profile.children.cycles-pp.kmem_cache_free 0.15 ± 2% +0.0 0.16 perf-profile.children.cycles-pp.anon_vma_clone 0.07 +0.0 0.08 ± 4% perf-profile.children.cycles-pp.ttwu_queue_wakelist 0.07 ± 5% +0.0 0.08 ± 5% perf-profile.children.cycles-pp.pick_next_task_fair 0.08 ± 4% +0.0 0.09 ± 5% perf-profile.children.cycles-pp.__pick_next_task 0.07 +0.0 0.08 ± 5% perf-profile.children.cycles-pp.raw_spin_rq_lock_nested 0.22 +0.0 0.24 ± 3% perf-profile.children.cycles-pp.vma_expand 0.09 ± 4% +0.0 0.10 ± 4% perf-profile.children.cycles-pp.dequeue_task_fair 0.10 ± 3% +0.0 0.12 ± 3% perf-profile.children.cycles-pp.schedule_idle 0.08 ± 4% +0.0 0.10 ± 3% perf-profile.children.cycles-pp.dequeue_entity 0.09 ± 4% +0.0 0.11 ± 4% perf-profile.children.cycles-pp.try_to_block_task 0.45 +0.0 0.47 perf-profile.children.cycles-pp.__split_vma 0.08 ± 5% +0.0 0.10 ± 4% perf-profile.children.cycles-pp.dequeue_entities 0.16 ± 2% +0.0 0.18 ± 4% perf-profile.children.cycles-pp.commit_merge 0.16 +0.0 0.18 ± 5% perf-profile.children.cycles-pp.vma_complete 0.12 ± 7% +0.0 0.14 ± 3% perf-profile.children.cycles-pp.__flush_smp_call_function_queue 0.25 +0.0 0.27 ± 3% perf-profile.children.cycles-pp.vma_merge_new_range 0.54 +0.0 0.56 perf-profile.children.cycles-pp.do_mmap 0.08 ± 5% +0.0 0.11 ± 4% perf-profile.children.cycles-pp._raw_spin_lock_irqsave 0.05 ± 7% +0.0 0.08 ± 4% perf-profile.children.cycles-pp.update_curr 0.04 ± 44% +0.0 0.08 ± 6% perf-profile.children.cycles-pp.native_queued_spin_lock_slowpath 0.41 +0.0 0.44 ± 2% perf-profile.children.cycles-pp.__hrtimer_run_queues 0.39 +0.0 0.43 ± 2% perf-profile.children.cycles-pp.tick_nohz_handler 0.18 ± 4% +0.0 0.21 ± 3% perf-profile.children.cycles-pp.schedule 0.17 ± 3% +0.0 0.21 ± 2% perf-profile.children.cycles-pp.schedule_preempt_disabled 0.18 ± 2% +0.0 0.22 ± 2% perf-profile.children.cycles-pp.try_to_wake_up 0.18 ± 4% +0.0 0.22 ± 3% perf-profile.children.cycles-pp.wake_up_q 0.35 +0.0 0.39 ± 2% perf-profile.children.cycles-pp.update_process_times 0.24 ± 3% +0.0 0.28 ± 3% perf-profile.children.cycles-pp.sched_tick 0.25 ± 3% +0.0 0.29 ± 3% perf-profile.children.cycles-pp.rwsem_wake 0.07 +0.0 0.12 ± 3% perf-profile.children.cycles-pp._raw_spin_lock 0.28 ± 2% +0.0 0.33 ± 2% perf-profile.children.cycles-pp.__schedule 0.18 ± 3% +0.1 0.23 ± 5% perf-profile.children.cycles-pp.task_tick_fair 0.00 +0.1 0.06 perf-profile.children.cycles-pp.update_se 0.69 ± 3% +0.1 0.76 ± 2% perf-profile.children.cycles-pp.cpuidle_enter 0.69 ± 3% +0.1 0.76 ± 2% perf-profile.children.cycles-pp.cpuidle_enter_state 0.72 ± 3% +0.1 0.79 ± 2% perf-profile.children.cycles-pp.cpuidle_idle_call 0.36 ± 3% +0.1 0.44 ± 2% perf-profile.children.cycles-pp.intel_idle_irq 0.99 ± 3% +0.1 1.10 ± 2% perf-profile.children.cycles-pp.common_startup_64 0.99 ± 3% +0.1 1.10 ± 2% perf-profile.children.cycles-pp.cpu_startup_entry 0.99 ± 3% +0.1 1.10 ± 2% perf-profile.children.cycles-pp.do_idle 0.97 ± 3% +0.1 1.08 ± 2% perf-profile.children.cycles-pp.start_secondary 94.33 -0.2 94.10 perf-profile.self.cycles-pp.osq_lock 0.32 -0.0 0.29 ± 2% perf-profile.self.cycles-pp.rwsem_down_write_slowpath 0.07 ± 5% -0.0 0.05 perf-profile.self.cycles-pp.vms_complete_munmap_vmas 0.05 +0.0 0.06 perf-profile.self.cycles-pp.wake_q_add 0.06 +0.0 0.07 ± 5% perf-profile.self.cycles-pp._raw_spin_lock 0.06 ± 6% +0.0 0.08 ± 4% perf-profile.self.cycles-pp._raw_spin_lock_irqsave 0.04 ± 44% +0.0 0.08 ± 6% perf-profile.self.cycles-pp.native_queued_spin_lock_slowpath 0.34 ± 4% +0.1 0.42 perf-profile.self.cycles-pp.intel_idle_irq 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