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McKenney, we don't have enough knowledge to understand the performance impact of this commit. since the data is stable, we still report out FYI what we see in our tests. please educate us if this report is less meaningful. thanks Hello, kernel test robot noticed a 2.0% improvement of unixbench.throughput on: commit: b41f5a411fb5f8c76c1d945ab391873414d01647 ("rcu: Clean up after the SRCU-fastification of RCU Tasks Trace") https://github.com/paulmckrcu/linux dev.2025.12.16a testcase: unixbench 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: runtime: 300s nr_task: 100% test: double cpufreq_governor: performance In addition to that, the commit also has significant impact on the following tests: +------------------+-------------------------------------------------------------------------------------------+ | testcase: change | unixbench: unixbench.throughput 2.1% improvement | | test machine | 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory | | test parameters | cpufreq_governor=performance | | | nr_task=100% | | | runtime=300s | | | test=long | +------------------+-------------------------------------------------------------------------------------------+ Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20260107/202601071255.645ef92e-lkp@intel.com ========================================================================================= compiler/cpufreq_governor/kconfig/nr_task/rootfs/runtime/tbox_group/test/testcase: gcc-14/performance/x86_64-rhel-9.4/100%/debian-13-x86_64-20250902.cgz/300s/lkp-icl-2sp9/double/unixbench commit: 14c7fd5dbf ("context_tracking: Remove rcu_task_trace_heavyweight_{enter,exit}()") b41f5a411f ("rcu: Clean up after the SRCU-fastification of RCU Tasks Trace") 14c7fd5dbfa07e79 b41f5a411fb5f8c76c1d945ab39 ---------------- --------------------------- %stddev %change %stddev \ | \ 13742762 ± 15% +31.8% 18115584 ± 15% meminfo.DirectMap2M 43251 -2.0% 42383 proc-vmstat.nr_slab_unreclaimable 2.114e+09 +2.0% 2.156e+09 unixbench.throughput 2.748e+11 +2.0% 2.803e+11 unixbench.workload 13.18 ± 51% -7.8 5.39 ±142% perf-profile.calltrace.cycles-pp.drm_atomic_helper_commit_planes.drm_atomic_helper_commit_tail.ast_mode_config_helper_atomic_commit_tail.commit_tail.drm_atomic_helper_commit 13.12 ± 51% -7.7 5.39 ±142% perf-profile.calltrace.cycles-pp.ast_primary_plane_helper_atomic_update.drm_atomic_helper_commit_planes.drm_atomic_helper_commit_tail.ast_mode_config_helper_atomic_commit_tail.commit_tail 13.12 ± 51% -7.7 5.39 ±142% perf-profile.calltrace.cycles-pp.drm_fb_memcpy.ast_primary_plane_helper_atomic_update.drm_atomic_helper_commit_planes.drm_atomic_helper_commit_tail.ast_mode_config_helper_atomic_commit_tail 12.91 ± 52% -7.6 5.29 ±141% perf-profile.calltrace.cycles-pp.memcpy_toio.drm_fb_memcpy.ast_primary_plane_helper_atomic_update.drm_atomic_helper_commit_planes.drm_atomic_helper_commit_tail 1.80 ± 26% -1.3 0.48 ±110% perf-profile.calltrace.cycles-pp.setlocale 13.18 ± 51% -7.8 5.39 ±142% perf-profile.children.cycles-pp.drm_atomic_helper_commit_planes 1.80 ± 26% -1.1 0.69 ± 52% perf-profile.children.cycles-pp.setlocale 0.45 ± 86% +0.8 1.29 ± 37% perf-profile.children.cycles-pp.folio_remove_rmap_ptes 0.34 ±121% +0.9 1.22 ± 32% perf-profile.self.cycles-pp.folio_remove_rmap_ptes 8.198e+10 +2.0% 8.361e+10 perf-stat.i.branch-instructions 0.89 -0.1 0.75 ± 3% perf-stat.i.branch-miss-rate% 3.715e+08 -45.1% 2.04e+08 ± 2% perf-stat.i.branch-misses 1.09 -1.8% 1.07 perf-stat.i.cpi 1.713e+11 +2.0% 1.746e+11 perf-stat.i.instructions 0.97 +1.6% 0.98 perf-stat.i.ipc 0.45 -0.2 0.24 ± 2% perf-stat.overall.branch-miss-rate% 1.02 -1.9% 1.00 perf-stat.overall.cpi 0.98 +2.0% 1.00 perf-stat.overall.ipc 8.136e+10 +2.0% 8.299e+10 perf-stat.ps.branch-instructions 3.687e+08 -45.1% 2.024e+08 ± 2% perf-stat.ps.branch-misses 1.7e+11 +2.0% 1.733e+11 perf-stat.ps.instructions 2.241e+13 +1.9% 2.283e+13 perf-stat.total.instructions *************************************************************************************************** lkp-icl-2sp9: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory ========================================================================================= compiler/cpufreq_governor/kconfig/nr_task/rootfs/runtime/tbox_group/test/testcase: gcc-14/performance/x86_64-rhel-9.4/100%/debian-13-x86_64-20250902.cgz/300s/lkp-icl-2sp9/long/unixbench commit: 14c7fd5dbf ("context_tracking: Remove rcu_task_trace_heavyweight_{enter,exit}()") b41f5a411f ("rcu: Clean up after the SRCU-fastification of RCU Tasks Trace") 14c7fd5dbfa07e79 b41f5a411fb5f8c76c1d945ab39 ---------------- --------------------------- %stddev %change %stddev \ | \ 43238 -1.9% 42435 proc-vmstat.nr_slab_unreclaimable 2.113e+09 +2.1% 2.156e+09 unixbench.throughput 2.746e+11 +2.1% 2.803e+11 unixbench.workload 8.191e+10 +2.1% 8.36e+10 perf-stat.i.branch-instructions 0.91 ± 2% -0.2 0.72 perf-stat.i.branch-miss-rate% 3.799e+08 -46.3% 2.041e+08 ± 2% perf-stat.i.branch-misses 644407 ± 2% -3.0% 624964 perf-stat.i.cycles-between-cache-misses 1.711e+11 +2.1% 1.746e+11 perf-stat.i.instructions 0.97 +1.7% 0.98 perf-stat.i.ipc 0.46 -0.2 0.24 ± 2% perf-stat.overall.branch-miss-rate% 1.03 -2.0% 1.00 perf-stat.overall.cpi 0.98 +2.1% 1.00 perf-stat.overall.ipc 8.13e+10 +2.1% 8.297e+10 perf-stat.ps.branch-instructions 3.771e+08 -46.3% 2.025e+08 ± 2% perf-stat.ps.branch-misses 1.698e+11 +2.1% 1.733e+11 perf-stat.ps.instructions 2.24e+13 +2.0% 2.286e+13 perf-stat.total.instructions 16.25 ± 81% -8.4 7.84 ±141% perf-profile.calltrace.cycles-pp.ksys_write.do_syscall_64.entry_SYSCALL_64_after_hwframe 16.25 ± 81% -8.4 7.84 ±141% perf-profile.calltrace.cycles-pp.vfs_write.ksys_write.do_syscall_64.entry_SYSCALL_64_after_hwframe 16.18 ± 80% -8.3 7.84 ±141% perf-profile.calltrace.cycles-pp.console_flush_one_record.console_unlock.vprintk_emit.devkmsg_emit.devkmsg_write.cold 16.18 ± 80% -8.3 7.84 ±141% perf-profile.calltrace.cycles-pp.console_unlock.vprintk_emit.devkmsg_emit.devkmsg_write.cold.vfs_write 16.18 ± 80% -8.3 7.84 ±141% perf-profile.calltrace.cycles-pp.devkmsg_emit.devkmsg_write.cold.vfs_write.ksys_write.do_syscall_64 16.18 ± 80% -8.3 7.84 ±141% perf-profile.calltrace.cycles-pp.devkmsg_write.cold.vfs_write.ksys_write.do_syscall_64.entry_SYSCALL_64_after_hwframe 16.18 ± 80% -8.3 7.84 ±141% perf-profile.calltrace.cycles-pp.vprintk_emit.devkmsg_emit.devkmsg_write.cold.vfs_write.ksys_write 15.38 ± 80% -7.7 7.63 ±141% perf-profile.calltrace.cycles-pp.serial8250_console_write.console_flush_one_record.console_unlock.vprintk_emit.devkmsg_emit 13.33 ± 82% -6.4 6.90 ±141% perf-profile.calltrace.cycles-pp.wait_for_lsr.serial8250_console_write.console_flush_one_record.console_unlock.vprintk_emit 10.50 ± 77% -4.9 5.65 ±141% perf-profile.calltrace.cycles-pp.io_serial_in.wait_for_lsr.serial8250_console_write.console_flush_one_record.console_unlock 1.58 ± 22% +0.9 2.46 ± 20% perf-profile.calltrace.cycles-pp.perf_mmap__push.record__mmap_read_evlist.cmd_record.run_builtin.handle_internal_command 1.58 ± 22% +0.9 2.46 ± 20% perf-profile.calltrace.cycles-pp.record__mmap_read_evlist.cmd_record.run_builtin.handle_internal_command.main 1.52 ± 25% +0.9 2.46 ± 20% perf-profile.calltrace.cycles-pp.record__pushfn.perf_mmap__push.record__mmap_read_evlist.cmd_record.run_builtin 16.18 ± 80% -8.3 7.84 ±141% perf-profile.children.cycles-pp.console_flush_one_record 16.18 ± 80% -8.3 7.84 ±141% perf-profile.children.cycles-pp.console_unlock 16.18 ± 80% -8.3 7.84 ±141% perf-profile.children.cycles-pp.devkmsg_emit 16.18 ± 80% -8.3 7.84 ±141% perf-profile.children.cycles-pp.devkmsg_write.cold 16.18 ± 80% -8.3 7.84 ±141% perf-profile.children.cycles-pp.vprintk_emit 15.38 ± 80% -7.9 7.52 ±141% perf-profile.children.cycles-pp.serial8250_console_write 13.92 ± 81% -6.8 7.11 ±141% perf-profile.children.cycles-pp.wait_for_lsr 11.03 ± 77% -5.3 5.74 ±141% perf-profile.children.cycles-pp.io_serial_in 1.58 ± 22% +0.9 2.46 ± 20% perf-profile.children.cycles-pp.perf_mmap__push 1.58 ± 22% +0.9 2.46 ± 20% perf-profile.children.cycles-pp.record__mmap_read_evlist 1.52 ± 25% +0.9 2.46 ± 20% perf-profile.children.cycles-pp.record__pushfn 11.03 ± 77% -5.3 5.74 ±141% perf-profile.self.cycles-pp.io_serial_in 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