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Thu, 23 Oct 2025 07:22:29 +0000 Date: Thu, 23 Oct 2025 15:22:11 +0800 From: kernel test robot To: Tim Chen CC: , , K Prateek Nayak , Tim Chen , , , , , Peter Zijlstra , Ingo Molnar , "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 16/19] sched/fair: Exclude processes with many threads from cache-aware scheduling Message-ID: <202510231406.30bc8aec-lkp@intel.com> Content-Type: text/plain; charset="iso-8859-1" Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <637cdb8ab11b1b978d697ed744cc402d32443ecc.1760206683.git.tim.c.chen@linux.intel.com> X-ClientProxiedBy: KL1PR01CA0072.apcprd01.prod.exchangelabs.com (2603:1096:820:5::36) 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 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LV3PR11MB8603.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 23 Oct 2025 07:22:28.9927 (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: fZROiVAComI+WSVqzQqMOZzFMnUvGMyMHbemruCvr6GXLLZOz9sHsOKJAh7jyuZFP+b5ug7aDMJiGuJXOlt3sA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR11MB5312 X-OriginatorOrg: intel.com Hello, kernel test robot noticed a 2.1% regression of will-it-scale.per_thread_ops on: commit: cb57b28051ef1d84e7cb14db4e1ab99b4f33b4b5 ("[PATCH 16/19] sched/fair: Exclude processes with many threads from cache-aware scheduling") 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/637cdb8ab11b1b978d697ed744cc402d32443ecc.1760206683.git.tim.c.chen@linux.intel.com/ patch subject: [PATCH 16/19] sched/fair: Exclude processes with many threads from cache-aware scheduling testcase: will-it-scale config: x86_64-rhel-9.4 compiler: gcc-14 test machine: 48 threads 2 sockets Intel(R) Xeon(R) CPU E5-2697 v2 @ 2.70GHz (Ivy Bridge-EP) with 64G memory parameters: nr_task: 100% mode: thread test: tlb_flush2 cpufreq_governor: performance If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202510231406.30bc8aec-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20251023/202510231406.30bc8aec-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-ivb-2ep2/tlb_flush2/will-it-scale commit: 4ac141e433 ("sched/fair: Respect LLC preference in task migration and detach") cb57b28051 ("sched/fair: Exclude processes with many threads from cache-aware scheduling") 4ac141e4330723c0 cb57b28051ef1d84e7cb14db4e1 ---------------- --------------------------- %stddev %change %stddev \ | \ 1482496 -2.1% 1451299 will-it-scale.48.threads 30884 -2.1% 30235 will-it-scale.per_thread_ops 1482496 -2.1% 1451299 will-it-scale.workload 4.447e+08 -2.1% 4.355e+08 proc-vmstat.numa_hit 4.447e+08 -2.1% 4.355e+08 proc-vmstat.numa_local 4.447e+08 -2.1% 4.354e+08 proc-vmstat.pgalloc_normal 8.884e+08 -2.1% 8.698e+08 proc-vmstat.pgfault 4.446e+08 -2.1% 4.353e+08 proc-vmstat.pgfree 6.446e+09 -2.0% 6.318e+09 perf-stat.i.branch-instructions 1.462e+08 -1.4% 1.441e+08 perf-stat.i.branch-misses 1.467e+08 -1.6% 1.444e+08 perf-stat.i.cache-misses 7.692e+08 -1.4% 7.587e+08 perf-stat.i.cache-references 101348 ± 2% +3.6% 104965 perf-stat.i.context-switches 4.14 +1.9% 4.22 perf-stat.i.cpi 883.41 +1.4% 896.20 perf-stat.i.cycles-between-cache-misses 3.083e+10 -2.0% 3.022e+10 perf-stat.i.instructions 0.24 -1.8% 0.24 perf-stat.i.ipc 124.71 -2.0% 122.18 perf-stat.i.metric.K/sec 2944589 -2.1% 2882055 perf-stat.i.minor-faults 2944589 -2.1% 2882055 perf-stat.i.page-faults 4.17 +1.9% 4.25 perf-stat.overall.cpi 876.76 +1.5% 889.96 perf-stat.overall.cycles-between-cache-misses 0.24 -1.8% 0.24 perf-stat.overall.ipc 6.417e+09 -2.0% 6.29e+09 perf-stat.ps.branch-instructions 1.455e+08 -1.4% 1.434e+08 perf-stat.ps.branch-misses 1.46e+08 -1.6% 1.436e+08 perf-stat.ps.cache-misses 7.653e+08 -1.4% 7.549e+08 perf-stat.ps.cache-references 100692 ± 2% +3.6% 104309 perf-stat.ps.context-switches 3.069e+10 -2.0% 3.008e+10 perf-stat.ps.instructions 2931887 -2.1% 2869944 perf-stat.ps.minor-faults 2931887 -2.1% 2869944 perf-stat.ps.page-faults 9.273e+12 -1.9% 9.096e+12 perf-stat.total.instructions 62.03 -1.8 60.18 perf-profile.calltrace.cycles-pp.on_each_cpu_cond_mask.flush_tlb_mm_range.tlb_finish_mmu.do_madvise.__x64_sys_madvise 63.66 -1.8 61.82 perf-profile.calltrace.cycles-pp.flush_tlb_mm_range.tlb_finish_mmu.do_madvise.__x64_sys_madvise.do_syscall_64 61.19 -1.8 59.36 perf-profile.calltrace.cycles-pp.smp_call_function_many_cond.on_each_cpu_cond_mask.flush_tlb_mm_range.tlb_finish_mmu.do_madvise 65.49 -1.7 63.79 perf-profile.calltrace.cycles-pp.tlb_finish_mmu.do_madvise.__x64_sys_madvise.do_syscall_64.entry_SYSCALL_64_after_hwframe 75.54 -1.5 74.02 perf-profile.calltrace.cycles-pp.__madvise 71.89 -1.5 70.41 perf-profile.calltrace.cycles-pp.__x64_sys_madvise.do_syscall_64.entry_SYSCALL_64_after_hwframe.__madvise 72.40 -1.5 70.92 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.__madvise 71.83 -1.5 70.35 perf-profile.calltrace.cycles-pp.do_madvise.__x64_sys_madvise.do_syscall_64.entry_SYSCALL_64_after_hwframe.__madvise 72.35 -1.5 70.87 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.__madvise 15.31 -0.6 14.70 perf-profile.calltrace.cycles-pp.asm_sysvec_call_function.smp_call_function_many_cond.on_each_cpu_cond_mask.flush_tlb_mm_range.tlb_finish_mmu 12.04 -0.5 11.52 perf-profile.calltrace.cycles-pp.sysvec_call_function.asm_sysvec_call_function.smp_call_function_many_cond.on_each_cpu_cond_mask.flush_tlb_mm_range 10.97 -0.5 10.47 perf-profile.calltrace.cycles-pp.__flush_smp_call_function_queue.__sysvec_call_function.sysvec_call_function.asm_sysvec_call_function.smp_call_function_many_cond 11.08 -0.5 10.58 perf-profile.calltrace.cycles-pp.__sysvec_call_function.sysvec_call_function.asm_sysvec_call_function.smp_call_function_many_cond.on_each_cpu_cond_mask 4.36 -0.2 4.15 perf-profile.calltrace.cycles-pp.flush_tlb_func.__flush_smp_call_function_queue.__sysvec_call_function.sysvec_call_function.asm_sysvec_call_function 4.53 -0.2 4.34 perf-profile.calltrace.cycles-pp.llist_reverse_order.__flush_smp_call_function_queue.__sysvec_call_function.sysvec_call_function.asm_sysvec_call_function 2.02 ± 2% -0.1 1.95 perf-profile.calltrace.cycles-pp.lock_vma_under_rcu.do_user_addr_fault.exc_page_fault.asm_exc_page_fault.testcase 1.47 -0.1 1.42 perf-profile.calltrace.cycles-pp.folio_add_lru.do_anonymous_page.__handle_mm_fault.handle_mm_fault.do_user_addr_fault 0.83 ± 2% -0.0 0.80 perf-profile.calltrace.cycles-pp.asm_sysvec_call_function.do_user_addr_fault.exc_page_fault.asm_exc_page_fault.testcase 0.65 ± 2% -0.0 0.62 perf-profile.calltrace.cycles-pp.__sysvec_call_function.sysvec_call_function.asm_sysvec_call_function.do_user_addr_fault.exc_page_fault 0.73 ± 2% -0.0 0.70 perf-profile.calltrace.cycles-pp.sysvec_call_function.asm_sysvec_call_function.do_user_addr_fault.exc_page_fault.asm_exc_page_fault 0.64 ± 2% -0.0 0.61 ± 2% perf-profile.calltrace.cycles-pp.__flush_smp_call_function_queue.__sysvec_call_function.sysvec_call_function.asm_sysvec_call_function.do_user_addr_fault 0.73 -0.0 0.71 perf-profile.calltrace.cycles-pp.__sysvec_call_function.sysvec_call_function.asm_sysvec_call_function.testcase 0.84 -0.0 0.82 perf-profile.calltrace.cycles-pp.clear_page_erms.prep_new_page.get_page_from_freelist.__alloc_frozen_pages_noprof.alloc_pages_mpol 1.65 +0.0 1.68 perf-profile.calltrace.cycles-pp.__alloc_frozen_pages_noprof.alloc_pages_mpol.vma_alloc_folio_noprof.alloc_anon_folio.do_anonymous_page 1.92 +0.0 1.96 perf-profile.calltrace.cycles-pp.vma_alloc_folio_noprof.alloc_anon_folio.do_anonymous_page.__handle_mm_fault.handle_mm_fault 1.79 +0.0 1.83 perf-profile.calltrace.cycles-pp.alloc_pages_mpol.vma_alloc_folio_noprof.alloc_anon_folio.do_anonymous_page.__handle_mm_fault 0.92 ± 3% +0.1 1.04 perf-profile.calltrace.cycles-pp.tlb_gather_mmu.do_madvise.__x64_sys_madvise.do_syscall_64.entry_SYSCALL_64_after_hwframe 2.83 ± 6% +0.2 3.04 ± 2% perf-profile.calltrace.cycles-pp.intel_idle.cpuidle_enter_state.cpuidle_enter.cpuidle_idle_call.do_idle 7.06 +0.4 7.48 perf-profile.calltrace.cycles-pp.__handle_mm_fault.handle_mm_fault.do_user_addr_fault.exc_page_fault.asm_exc_page_fault 6.25 +0.4 6.70 perf-profile.calltrace.cycles-pp.do_anonymous_page.__handle_mm_fault.handle_mm_fault.do_user_addr_fault.exc_page_fault 2.48 +0.5 3.02 perf-profile.calltrace.cycles-pp.alloc_anon_folio.do_anonymous_page.__handle_mm_fault.handle_mm_fault.do_user_addr_fault 0.00 +0.7 0.74 ± 5% perf-profile.calltrace.cycles-pp.get_mem_cgroup_from_mm.__mem_cgroup_charge.alloc_anon_folio.do_anonymous_page.__handle_mm_fault 0.00 +0.9 0.94 ± 4% perf-profile.calltrace.cycles-pp.__mem_cgroup_charge.alloc_anon_folio.do_anonymous_page.__handle_mm_fault.handle_mm_fault 19.08 +1.3 20.36 perf-profile.calltrace.cycles-pp.testcase 14.17 +1.3 15.46 perf-profile.calltrace.cycles-pp.asm_exc_page_fault.testcase 12.74 +1.4 14.10 perf-profile.calltrace.cycles-pp.exc_page_fault.asm_exc_page_fault.testcase 12.49 +1.4 13.85 perf-profile.calltrace.cycles-pp.do_user_addr_fault.exc_page_fault.asm_exc_page_fault.testcase 7.97 +1.4 9.38 perf-profile.calltrace.cycles-pp.handle_mm_fault.do_user_addr_fault.exc_page_fault.asm_exc_page_fault.testcase 62.25 -1.9 60.39 perf-profile.children.cycles-pp.smp_call_function_many_cond 62.26 -1.9 60.40 perf-profile.children.cycles-pp.on_each_cpu_cond_mask 63.94 -1.8 62.08 perf-profile.children.cycles-pp.flush_tlb_mm_range 65.76 -1.7 64.06 perf-profile.children.cycles-pp.tlb_finish_mmu 75.72 -1.5 74.19 perf-profile.children.cycles-pp.__madvise 73.51 -1.5 72.02 perf-profile.children.cycles-pp.entry_SYSCALL_64_after_hwframe 73.48 -1.5 71.99 perf-profile.children.cycles-pp.do_syscall_64 71.90 -1.5 70.41 perf-profile.children.cycles-pp.__x64_sys_madvise 71.85 -1.5 70.36 perf-profile.children.cycles-pp.do_madvise 18.46 -0.3 18.12 perf-profile.children.cycles-pp.__flush_smp_call_function_queue 19.79 -0.3 19.47 perf-profile.children.cycles-pp.sysvec_call_function 22.68 -0.3 22.36 perf-profile.children.cycles-pp.asm_sysvec_call_function 17.97 -0.3 17.65 perf-profile.children.cycles-pp.__sysvec_call_function 7.64 -0.2 7.46 perf-profile.children.cycles-pp.flush_tlb_func 7.49 -0.1 7.39 perf-profile.children.cycles-pp.llist_reverse_order 1.47 -0.1 1.42 perf-profile.children.cycles-pp.folio_add_lru 1.99 -0.0 1.94 perf-profile.children.cycles-pp.__pte_offset_map_lock 1.84 -0.0 1.80 perf-profile.children.cycles-pp._raw_spin_lock 1.31 -0.0 1.27 perf-profile.children.cycles-pp.folio_batch_move_lru 0.93 -0.0 0.90 perf-profile.children.cycles-pp.error_entry 0.42 -0.0 0.40 perf-profile.children.cycles-pp.vms_clear_ptes 0.89 -0.0 0.87 perf-profile.children.cycles-pp.clear_page_erms 0.94 -0.0 0.92 perf-profile.children.cycles-pp.prep_new_page 1.66 +0.0 1.69 perf-profile.children.cycles-pp.__alloc_frozen_pages_noprof 1.80 +0.0 1.84 perf-profile.children.cycles-pp.alloc_pages_mpol 0.00 +0.1 0.05 perf-profile.children.cycles-pp.__pi_memset 0.96 ± 3% +0.1 1.08 perf-profile.children.cycles-pp.tlb_gather_mmu 2.90 ± 6% +0.2 3.10 perf-profile.children.cycles-pp.intel_idle 3.23 ± 5% +0.2 3.45 perf-profile.children.cycles-pp.cpuidle_enter 3.32 ± 5% +0.2 3.54 perf-profile.children.cycles-pp.cpuidle_idle_call 7.09 +0.4 7.51 perf-profile.children.cycles-pp.__handle_mm_fault 6.27 +0.4 6.72 perf-profile.children.cycles-pp.do_anonymous_page 0.43 ± 6% +0.5 0.94 ± 4% perf-profile.children.cycles-pp.__mem_cgroup_charge 0.25 ± 11% +0.5 0.76 ± 5% perf-profile.children.cycles-pp.get_mem_cgroup_from_mm 2.49 +0.5 3.03 perf-profile.children.cycles-pp.alloc_anon_folio 19.67 +1.3 20.94 perf-profile.children.cycles-pp.testcase 14.47 +1.3 15.77 perf-profile.children.cycles-pp.asm_exc_page_fault 12.76 +1.4 14.12 perf-profile.children.cycles-pp.exc_page_fault 12.60 +1.4 13.96 perf-profile.children.cycles-pp.do_user_addr_fault 7.99 +1.5 9.44 perf-profile.children.cycles-pp.handle_mm_fault 42.94 -1.2 41.71 perf-profile.self.cycles-pp.smp_call_function_many_cond 6.02 -0.2 5.87 perf-profile.self.cycles-pp.flush_tlb_func 7.46 -0.1 7.36 perf-profile.self.cycles-pp.llist_reverse_order 1.44 -0.0 1.40 perf-profile.self.cycles-pp.lock_vma_under_rcu 0.88 -0.0 0.85 perf-profile.self.cycles-pp.native_queued_spin_lock_slowpath 0.91 -0.0 0.88 perf-profile.self.cycles-pp.error_entry 0.07 +0.0 0.08 ± 4% perf-profile.self.cycles-pp.get_page_from_freelist 0.76 ± 2% +0.1 0.86 perf-profile.self.cycles-pp.tlb_gather_mmu 1.10 ± 5% +0.1 1.24 ± 2% perf-profile.self.cycles-pp.tlb_finish_mmu 2.90 ± 6% +0.2 3.10 perf-profile.self.cycles-pp.intel_idle 0.20 ± 10% +0.4 0.62 ± 6% perf-profile.self.cycles-pp.get_mem_cgroup_from_mm 0.15 ± 4% +0.8 1.00 ± 3% perf-profile.self.cycles-pp.handle_mm_fault 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