FYI, we noticed a -5.5% regression of will-it-scale.per_process_ops due to commit: commit f0d9b9d4aa33f7ce9a0347256e5ffd91c8ad7c08 ("pt_regs_frame") https://github.com/jpoimboe/linux pt_regs_frame-nosave in testcase: will-it-scale on test machine: 16 threads Haswell High-end Desktop (i7-5960X 3.0G) with 16G memory with following parameters: cpufreq_governor=performance/test=signal1 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. Details are as below: --------------------------------------------------------------------------------------------------> To reproduce: git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git cd lkp-tests bin/lkp install job.yaml # job file is attached in this email bin/lkp run job.yaml ========================================================================================= compiler/cpufreq_governor/kconfig/rootfs/tbox_group/test/testcase: gcc-4.9/performance/x86_64-rhel/debian-x86_64-2015-02-07.cgz/lituya/signal1/will-it-scale commit: 4c195e79c9 ("x86: Fix thread_saved_pc()") f0d9b9d4aa ("pt_regs_frame") 4c195e79c9fb2f1b f0d9b9d4aa33f7ce9a0347256e ---------------- -------------------------- fail:runs %reproduction fail:runs | | | %stddev %change %stddev \ | \ 825921 ± 0% -5.5% 780374 ± 0% will-it-scale.per_process_ops 428112 ± 0% -9.3% 388301 ± 0% will-it-scale.per_thread_ops 0.29 ± 0% +14.3% 0.33 ± 0% will-it-scale.scalability 1377 ± 0% -1.2% 1360 ± 0% will-it-scale.time.system_time 28.13 ± 0% +60.4% 45.12 ± 0% will-it-scale.time.user_time 86876 ± 2% -6.3% 81414 ± 1% meminfo.DirectMap4k 2219 ± 0% -44.8% 1224 ± 57% proc-vmstat.pgactivate 126.75 ± 45% +81.2% 229.67 ± 7% slabinfo.taskstats.active_objs 126.75 ± 45% +81.2% 229.67 ± 7% slabinfo.taskstats.num_objs 9.762e+08 ± 1% -5.3% 9.249e+08 ± 2% perf-stat.L1-icache-load-misses 6.878e+09 ± 1% -2.5% 6.709e+09 ± 0% perf-stat.LLC-stores 4.061e+09 ± 0% -4.4% 3.881e+09 ± 0% perf-stat.branch-load-misses 8.024e+11 ± 0% -1.3% 7.919e+11 ± 0% perf-stat.branch-loads 4.022e+09 ± 1% -3.1% 3.898e+09 ± 0% perf-stat.branch-misses 6028 ± 2% -4.4% 5763 ± 5% perf-stat.cpu-migrations 1.387e+12 ± 1% -2.6% 1.351e+12 ± 1% perf-stat.dTLB-loads 0.50 ±173% +485.5% 2.94 ± 22% sched_debug.cfs_rq:/.MIN_vruntime.avg 8.05 ±173% +369.3% 37.76 ± 7% sched_debug.cfs_rq:/.MIN_vruntime.max 1.95 ±173% +405.1% 9.84 ± 3% sched_debug.cfs_rq:/.MIN_vruntime.stddev 0.50 ±173% +485.5% 2.94 ± 22% sched_debug.cfs_rq:/.max_vruntime.avg 8.05 ±173% +369.3% 37.76 ± 7% sched_debug.cfs_rq:/.max_vruntime.max 1.95 ±173% +405.1% 9.84 ± 3% sched_debug.cfs_rq:/.max_vruntime.stddev 0.38 ± 1% +31.5% 0.50 ± 20% sched_debug.cpu.nr_running.stddev -33.08 ±-16% -17.4% -27.33 ± -6% sched_debug.cpu.nr_uninterruptible.min 10.59 ± 10% -14.9% 9.01 ± 14% sched_debug.cpu.nr_uninterruptible.stddev 801.71 ± 29% -28.3% 574.61 ± 21% sched_debug.cpu.sched_count.min 252.75 ± 18% -33.4% 168.22 ± 7% sched_debug.cpu.ttwu_local.min 13785 ± 61% -100.0% 0.00 ± -1% latency_stats.avg.perf_event_alloc.SYSC_perf_event_open.SyS_perf_event_open.entry_SYSCALL_64_fastpath 228145 ± 4% -100.0% 0.00 ± -1% latency_stats.hits.pipe_wait.pipe_read.__vfs_read.vfs_read.SyS_read.entry_SYSCALL_64_fastpath 0.00 ± -1% +Inf% 253537 ± 15% latency_stats.hits.pipe_wait.pipe_read.__vfs_read.vfs_read.SyS_read.entry_SYSCALL_64_fastpath.entry_frame_ret 13785 ± 61% -100.0% 0.00 ± -1% latency_stats.max.perf_event_alloc.SYSC_perf_event_open.SyS_perf_event_open.entry_SYSCALL_64_fastpath 560819 ± 3% -100.0% 0.00 ± -1% latency_stats.sum.do_wait.SyS_wait4.entry_SYSCALL_64_fastpath 0.00 ± -1% +Inf% 537995 ± 6% latency_stats.sum.do_wait.SyS_wait4.entry_SYSCALL_64_fastpath.entry_frame_ret 15770 ± 25% -100.0% 0.00 ± -1% latency_stats.sum.ep_poll.SyS_epoll_wait.entry_SYSCALL_64_fastpath 0.00 ± -1% +Inf% 9999 ± 42% latency_stats.sum.ep_poll.SyS_epoll_wait.entry_SYSCALL_64_fastpath.entry_frame_ret 13785 ± 61% -100.0% 0.00 ± -1% latency_stats.sum.perf_event_alloc.SYSC_perf_event_open.SyS_perf_event_open.entry_SYSCALL_64_fastpath 1279350 ± 5% -100.0% 0.00 ± -1% latency_stats.sum.pipe_wait.pipe_read.__vfs_read.vfs_read.SyS_read.entry_SYSCALL_64_fastpath 0.00 ± -1% +Inf% 1217387 ± 6% latency_stats.sum.pipe_wait.pipe_read.__vfs_read.vfs_read.SyS_read.entry_SYSCALL_64_fastpath.entry_frame_ret 1379 ± 5% +590.6% 9527 ± 75% latency_stats.sum.rpc_wait_bit_killable.__rpc_execute.rpc_execute.rpc_run_task.nfs4_call_sync_sequence.[nfsv4]._nfs4_proc_access.[nfsv4].nfs4_proc_access.[nfsv4].nfs_do_access.nfs_permission.__inode_permission.inode_permission.link_path_walk 17.25 ± 2% -42.5% 9.92 ± 70% perf-profile.cycles-pp.__dequeue_signal.dequeue_signal.get_signal.do_signal.exit_to_usermode_loop 3.60 ± 1% -40.0% 2.16 ± 70% perf-profile.cycles-pp.__fpu__restore_sig.fpu__restore_sig.sys_rt_sigreturn.do_syscall_64.return_from_SYSCALL_64 16.64 ± 1% -42.4% 9.59 ± 70% perf-profile.cycles-pp.__send_signal.send_signal.do_send_sig_info.do_send_specific.do_tkill 1.46 ± 3% -40.6% 0.87 ± 70% perf-profile.cycles-pp.__set_current_blocked.signal_setup_done.do_signal.exit_to_usermode_loop.syscall_return_slowpath 11.98 ± 1% -43.7% 6.75 ± 70% perf-profile.cycles-pp.__sigqueue_alloc.__send_signal.send_signal.do_send_sig_info.do_send_specific 16.54 ± 2% -42.5% 9.51 ± 70% perf-profile.cycles-pp.__sigqueue_free.part.16.__dequeue_signal.dequeue_signal.get_signal.do_signal 8.82 ± 3% -42.2% 5.10 ± 70% perf-profile.cycles-pp._atomic_dec_and_lock.free_uid.__sigqueue_free.part.16.__dequeue_signal.dequeue_signal 1.23 ± 1% -42.5% 0.71 ± 71% perf-profile.cycles-pp.check_kill_permission.do_send_specific.do_tkill.sys_tgkill.entry_SYSCALL_64_fastpath 2.87 ± 2% -39.2% 1.74 ± 70% perf-profile.cycles-pp.complete_signal.__send_signal.send_signal.do_send_sig_info.do_send_specific 3.79 ± 0% -39.3% 2.30 ± 70% perf-profile.cycles-pp.copy_fpstate_to_sigframe.do_signal.exit_to_usermode_loop.syscall_return_slowpath.entry_SYSCALL_64_fastpath 18.08 ± 2% -42.6% 10.38 ± 70% perf-profile.cycles-pp.dequeue_signal.get_signal.do_signal.exit_to_usermode_loop.syscall_return_slowpath 18.94 ± 1% -41.7% 11.04 ± 70% perf-profile.cycles-pp.do_send_sig_info.do_send_specific.do_tkill.sys_tgkill.entry_SYSCALL_64_fastpath 21.38 ± 1% -100.0% 0.00 ± -1% perf-profile.cycles-pp.do_send_specific.do_tkill.sys_tgkill.entry_SYSCALL_64_fastpath 31.50 ± 0% -100.0% 0.00 ± -1% perf-profile.cycles-pp.do_signal.exit_to_usermode_loop.syscall_return_slowpath.entry_SYSCALL_64_fastpath 9.47 ± 1% -100.0% 0.00 ± -1% perf-profile.cycles-pp.do_syscall_64.return_from_SYSCALL_64 22.80 ± 0% -100.0% 0.00 ± -1% perf-profile.cycles-pp.do_tkill.sys_tgkill.entry_SYSCALL_64_fastpath 1.40 ± 3% -58.3% 0.58 ± 70% perf-profile.cycles-pp.entry_SYSCALL_64_after_swapgs 55.83 ± 0% -100.0% 0.00 ± -1% perf-profile.cycles-pp.entry_SYSCALL_64_fastpath 1.05 ± 2% -100.0% 0.00 ± -1% perf-profile.cycles-pp.exit_to_usermode_loop.do_syscall_64.return_from_SYSCALL_64 32.13 ± 0% -100.0% 0.00 ± -1% perf-profile.cycles-pp.exit_to_usermode_loop.syscall_return_slowpath.entry_SYSCALL_64_fastpath 2.25 ± 3% -37.0% 1.42 ± 70% perf-profile.cycles-pp.fpu__clear.do_signal.exit_to_usermode_loop.syscall_return_slowpath.entry_SYSCALL_64_fastpath 4.29 ± 1% -100.0% 0.00 ± -1% perf-profile.cycles-pp.fpu__restore_sig.sys_rt_sigreturn.do_syscall_64.return_from_SYSCALL_64 9.99 ± 1% -42.8% 5.72 ± 70% perf-profile.cycles-pp.free_uid.__sigqueue_free.part.16.__dequeue_signal.dequeue_signal.get_signal 19.88 ± 1% -42.1% 11.51 ± 70% perf-profile.cycles-pp.get_signal.do_signal.exit_to_usermode_loop.syscall_return_slowpath.entry_SYSCALL_64_fastpath 9.72 ± 1% -100.0% 0.00 ± -1% perf-profile.cycles-pp.return_from_SYSCALL_64 0.99 ± 2% -40.9% 0.58 ± 71% perf-profile.cycles-pp.security_task_kill.check_kill_permission.do_send_specific.do_tkill.sys_tgkill 17.17 ± 1% -42.2% 9.93 ± 70% perf-profile.cycles-pp.send_signal.do_send_sig_info.do_send_specific.do_tkill.sys_tgkill 1.54 ± 1% -100.0% 0.00 ± -1% perf-profile.cycles-pp.set_current_blocked.sys_rt_sigreturn.do_syscall_64.return_from_SYSCALL_64 1.81 ± 2% -40.3% 1.08 ± 70% perf-profile.cycles-pp.signal_setup_done.do_signal.exit_to_usermode_loop.syscall_return_slowpath.entry_SYSCALL_64_fastpath 2.45 ± 2% -39.2% 1.49 ± 70% perf-profile.cycles-pp.signal_wake_up_state.complete_signal.__send_signal.send_signal.do_send_sig_info 7.74 ± 1% -100.0% 0.00 ± -1% perf-profile.cycles-pp.sys_rt_sigreturn.do_syscall_64.return_from_SYSCALL_64 22.95 ± 0% -100.0% 0.00 ± -1% perf-profile.cycles-pp.sys_tgkill.entry_SYSCALL_64_fastpath 32.42 ± 0% -100.0% 0.00 ± -1% perf-profile.cycles-pp.syscall_return_slowpath.entry_SYSCALL_64_fastpath 1.59 ± 3% -37.6% 0.99 ± 70% perf-profile.cycles-pp.try_to_wake_up.wake_up_state.signal_wake_up_state.complete_signal.__send_signal 1.66 ± 3% -38.0% 1.03 ± 70% perf-profile.cycles-pp.wake_up_state.signal_wake_up_state.complete_signal.__send_signal.send_signal will-it-scale.scalability 0.34 ++------------------------------------------------------------------+ 0.335 O+O O O O O O O | | O O O O O O O O O O O O O O O O O | 0.33 ++ O | 0.325 ++ | | | 0.32 ++ | 0.315 ++ | 0.31 ++ | | | 0.305 ++ | 0.3 ++ | |.*.. .*. | 0.295 *+ * *.*..*.*.*.*..*.*.*. .*.*..*.*.*.*..*.*.*.*..*.*.*.*..*.* 0.29 ++---------------------------*--*-----------------------------------+ will-it-scale.per_process_ops 830000 ++-------------------------------------------------*--------*--*---+ *. .*..*.*. .*.*.*. .*.*.*.*..*.*.*.*.*..*.*.* *.*.* + .* 820000 ++* *.*. *. * | | | | | 810000 ++ | | | 800000 ++ | | | 790000 ++ | | | | O O O O O | 780000 O+ O O O O O O O O O O O O O O O O | | O O O O | 770000 ++-----------------------------------------------------------------+ will-it-scale.per_thread_ops 430000 ++---------*--------*-*----*---*-------------------*--*---*------*-+ *.*.*..*.* *..*.* * * *.*.*.*.*..*.*.* * *..* * 425000 ++ | 420000 ++ | | | 415000 ++ | 410000 ++ | | | 405000 ++ | 400000 ++ | | | 395000 ++ | 390000 ++ O O O | O O O O O O O O O O O O O O O O O O O O O O | 385000 ++-----O-----------------------------------------------------------+ [*] bisect-good sample [O] bisect-bad sample Thanks, Xiaolong