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From: kernel test robot <oliver.sang@intel.com>
To: Tim Chen <tim.c.chen@linux.intel.com>
Cc: <oe-lkp@lists.linux.dev>, <lkp@intel.com>,
	Chen Yu <yu.c.chen@intel.com>,
	Tim Chen <tim.c.chen@linux.intel.com>, <linux-mm@kvack.org>,
	<linux-kernel@vger.kernel.org>, <aubrey.li@linux.intel.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	K Prateek Nayak <kprateek.nayak@amd.com>,
	"Gautham R . Shenoy" <gautham.shenoy@amd.com>,
	Vincent Guittot <vincent.guittot@linaro.org>,
	Juri Lelli <juri.lelli@redhat.com>,
	Dietmar Eggemann <dietmar.eggemann@arm.com>,
	"Steven Rostedt" <rostedt@goodmis.org>,
	Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
	Valentin Schneider <vschneid@redhat.com>,
	"Madadi Vineeth Reddy" <vineethr@linux.ibm.com>,
	Hillf Danton <hdanton@sina.com>,
	"Shrikanth Hegde" <sshegde@linux.ibm.com>,
	Jianyong Wu <jianyong.wu@outlook.com>,
	"Yangyu Chen" <cyy@cyyself.name>,
	Tingyin Duan <tingyin.duan@gmail.com>,
	Vern Hao <vernhao@tencent.com>, Len Brown <len.brown@intel.com>,
	Aubrey Li <aubrey.li@intel.com>, Zhao Liu <zhao1.liu@intel.com>,
	Chen Yu <yu.chen.surf@gmail.com>,
	Libo Chen <libo.chen@oracle.com>,
	Adam Li <adamli@os.amperecomputing.com>,
	Tim Chen <tim.c.chen@intel.com>, <oliver.sang@intel.com>
Subject: Re: [PATCH 01/19] sched/fair: Add infrastructure for cache-aware load balancing
Date: Thu, 23 Oct 2025 15:26:05 +0800	[thread overview]
Message-ID: <202510231459.ad690ecd-lkp@intel.com> (raw)
In-Reply-To: <865b852e3fdef6561c9e0a5be9a94aec8a68cdea.1760206683.git.tim.c.chen@linux.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



  parent reply	other threads:[~2025-10-23  7:26 UTC|newest]

Thread overview: 116+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-10-11 18:24 [PATCH 00/19] Cache Aware Scheduling Tim Chen
2025-10-11 18:24 ` [PATCH 01/19] sched/fair: Add infrastructure for cache-aware load balancing Tim Chen
2025-10-14 19:12   ` Madadi Vineeth Reddy
2025-10-15  4:54     ` Chen, Yu C
2025-10-15 19:32       ` Tim Chen
2025-10-16  3:11         ` Chen, Yu C
2025-10-15 11:54     ` Peter Zijlstra
2025-10-15 16:07       ` Chen, Yu C
2025-10-23  7:26   ` kernel test robot [this message]
2025-10-27  4:47   ` K Prateek Nayak
2025-10-27 13:35     ` Chen, Yu C
2025-10-11 18:24 ` [PATCH 02/19] sched/fair: Record per-LLC utilization to guide cache-aware scheduling decisions Tim Chen
2025-10-15 10:15   ` Peter Zijlstra
2025-10-15 16:27     ` Chen, Yu C
2025-10-27  5:01   ` K Prateek Nayak
2025-10-27 14:07     ` Chen, Yu C
2025-10-28  2:50       ` K Prateek Nayak
2025-10-11 18:24 ` [PATCH 03/19] sched/fair: Introduce helper functions to enforce LLC migration policy Tim Chen
2025-10-11 18:24 ` [PATCH 04/19] sched/fair: Introduce a static key to enable cache aware only for multi LLCs Tim Chen
2025-10-15 11:04   ` Peter Zijlstra
2025-10-15 16:25     ` Chen, Yu C
2025-10-15 16:36       ` Shrikanth Hegde
2025-10-15 17:01         ` Chen, Yu C
2025-10-16  7:42           ` Peter Zijlstra
2025-10-17  2:08             ` Chen, Yu C
2025-10-16  7:40       ` Peter Zijlstra
2025-10-27  5:42   ` K Prateek Nayak
2025-10-27 12:56     ` Chen, Yu C
2025-10-27 23:36       ` Tim Chen
2025-10-29 12:36         ` Chen, Yu C
2025-10-28  2:46       ` K Prateek Nayak
2025-10-11 18:24 ` [PATCH 05/19] sched/fair: Add LLC index mapping for CPUs Tim Chen
2025-10-15 11:08   ` Peter Zijlstra
2025-10-15 11:58   ` Peter Zijlstra
2025-10-15 20:12     ` Tim Chen
2025-10-11 18:24 ` [PATCH 06/19] sched/fair: Assign preferred LLC ID to processes Tim Chen
2025-10-14  5:16   ` Chen, Yu C
2025-10-15 11:15     ` Peter Zijlstra
2025-10-16  3:13       ` Chen, Yu C
2025-10-17  4:50       ` Chen, Yu C
2025-10-20  9:41         ` Vern Hao
2025-10-11 18:24 ` [PATCH 07/19] sched/fair: Track LLC-preferred tasks per runqueue Tim Chen
2025-10-15 12:05   ` Peter Zijlstra
2025-10-15 20:03     ` Tim Chen
2025-10-16  7:44       ` Peter Zijlstra
2025-10-16 20:06         ` Tim Chen
2025-10-27  6:04   ` K Prateek Nayak
2025-10-28 15:15     ` Chen, Yu C
2025-10-28 15:46       ` Tim Chen
2025-10-29  4:32         ` K Prateek Nayak
2025-10-29 12:48           ` Chen, Yu C
2025-10-29  4:00       ` K Prateek Nayak
2025-10-28 17:06     ` Tim Chen
2025-10-11 18:24 ` [PATCH 08/19] sched/fair: Introduce per runqueue task LLC preference counter Tim Chen
2025-10-15 12:21   ` Peter Zijlstra
2025-10-15 20:41     ` Tim Chen
2025-10-16  7:49       ` Peter Zijlstra
2025-10-21  8:28       ` Madadi Vineeth Reddy
2025-10-23  6:07         ` Chen, Yu C
2025-10-11 18:24 ` [PATCH 09/19] sched/fair: Count tasks prefering each LLC in a sched group Tim Chen
2025-10-15 12:22   ` Peter Zijlstra
2025-10-15 20:42     ` Tim Chen
2025-10-15 12:25   ` Peter Zijlstra
2025-10-15 20:43     ` Tim Chen
2025-10-27  8:33   ` K Prateek Nayak
2025-10-27 23:19     ` Tim Chen
2025-10-11 18:24 ` [PATCH 10/19] sched/fair: Prioritize tasks preferring destination LLC during balancing Tim Chen
2025-10-15  7:23   ` kernel test robot
2025-10-15 15:08   ` Peter Zijlstra
2025-10-15 21:28     ` Tim Chen
2025-10-15 15:10   ` Peter Zijlstra
2025-10-15 16:03     ` Chen, Yu C
2025-10-24  9:32   ` Aaron Lu
2025-10-27  2:00     ` Chen, Yu C
2025-10-29  9:51       ` Aaron Lu
2025-10-29 13:19         ` Chen, Yu C
2025-10-27  6:29   ` K Prateek Nayak
2025-10-28 12:11     ` Chen, Yu C
2025-10-11 18:24 ` [PATCH 11/19] sched/fair: Identify busiest sched_group for LLC-aware load balancing Tim Chen
2025-10-15 15:24   ` Peter Zijlstra
2025-10-15 21:18     ` Tim Chen
2025-10-11 18:24 ` [PATCH 12/19] sched/fair: Add migrate_llc_task migration type for cache-aware balancing Tim Chen
2025-10-27  9:04   ` K Prateek Nayak
2025-10-27 22:59     ` Tim Chen
2025-10-11 18:24 ` [PATCH 13/19] sched/fair: Handle moving single tasks to/from their preferred LLC Tim Chen
2025-10-11 18:24 ` [PATCH 14/19] sched/fair: Consider LLC preference when selecting tasks for load balancing Tim Chen
2025-10-11 18:24 ` [PATCH 15/19] sched/fair: Respect LLC preference in task migration and detach Tim Chen
2025-10-28  6:02   ` K Prateek Nayak
2025-10-28 11:58     ` Chen, Yu C
2025-10-28 15:30       ` Tim Chen
2025-10-29  4:15         ` K Prateek Nayak
2025-10-29  3:54       ` K Prateek Nayak
2025-10-29 14:23         ` Chen, Yu C
2025-10-29 21:09         ` Tim Chen
2025-10-30  4:19           ` K Prateek Nayak
2025-10-30 20:07             ` Tim Chen
2025-10-31  3:32               ` K Prateek Nayak
2025-10-31 15:17                 ` Chen, Yu C
2025-11-03 21:41                   ` Tim Chen
2025-11-03 22:07                 ` Tim Chen
2025-10-11 18:24 ` [PATCH 16/19] sched/fair: Exclude processes with many threads from cache-aware scheduling Tim Chen
2025-10-23  7:22   ` kernel test robot
2025-10-11 18:24 ` [PATCH 17/19] sched/fair: Disable cache aware scheduling for processes with high thread counts Tim Chen
2025-10-22 17:21   ` Madadi Vineeth Reddy
2025-10-23  6:55     ` Chen, Yu C
2025-10-11 18:24 ` [PATCH 18/19] sched/fair: Avoid cache-aware scheduling for memory-heavy processes Tim Chen
2025-10-15  6:57   ` kernel test robot
2025-10-16  4:44     ` Chen, Yu C
2025-10-11 18:24 ` [PATCH 19/19] sched/fair: Add user control to adjust the tolerance of cache-aware scheduling Tim Chen
2025-10-29  8:07   ` Aaron Lu
2025-10-29 12:54     ` Chen, Yu C
2025-10-14 12:13 ` [PATCH 00/19] Cache Aware Scheduling Madadi Vineeth Reddy
2025-10-14 21:48   ` Tim Chen
2025-10-15  5:38     ` Chen, Yu C
2025-10-15 18:26       ` Madadi Vineeth Reddy
2025-10-16  4:57         ` Chen, Yu C

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