Greeting, There is no primary kpi change in this test, below is the data collected through multiple monitors running background just for your information. commit: e64855c6cfaa0a80c1b71c5f647cb792dc436668 ("fs: Add helper to clean bdev aliases under a bh and use it") https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master in testcase: fio-basic on test machine: 16 threads Intel(R) Xeon(R) CPU D-1541 @ 2.10GHz with 8G memory with following parameters: runtime: 300s disk: 1SSD fs: xfs nr_task: 4 rw: randwrite bs: 4M ioengine: sync test_size: 400g cpufreq_governor: performance test-description: Fio is a tool that will spawn a number of threads or processes doing a particular type of I/O action as specified by the user. test-url: https://github.com/axboe/fio 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 ========================================================================================= tbox_group/testcase/rootfs/kconfig/compiler/runtime/disk/fs/nr_task/rw/bs/ioengine/test_size/cpufreq_governor: lkp-bdw-de1/fio-basic/debian-x86_64-2016-08-31.cgz/x86_64-rhel-7.2/gcc-6/300s/1SSD/xfs/4/randwrite/4M/sync/400g/performance commit: 69a9bea146b185be8ec50e80eaecd8e487e689f8 e64855c6cfaa0a80c1b71c5f647cb792dc436668 69a9bea146b185be e64855c6cfaa0a80c1b71c5f64 ---------------- -------------------------- %stddev %change %stddev \ | \ 64.95 ± 0% +18.7% 77.13 ± 0% fio.time.system_time 23.00 ± 0% +18.8% 27.33 ± 1% fio.time.percent_of_cpu_this_job_got 7.63 ± 4% -27.4% 5.54 ± 16% fio.latency_100ms% 91.53 ± 0% +2.3% 93.61 ± 0% fio.latency_50ms% 94514 ± 2% -10.8% 84334 ± 1% softirqs.RCU 10498 ± 7% +12.4% 11798 ± 4% slabinfo.anon_vma_chain.active_objs 10606 ± 6% +11.2% 11798 ± 4% slabinfo.anon_vma_chain.num_objs 23.00 ± 0% +18.8% 27.33 ± 1% time.percent_of_cpu_this_job_got 64.95 ± 0% +18.7% 77.13 ± 0% time.system_time 1984 ±173% +1307.0% 27918 ± 71% latency_stats.avg.perf_event_alloc.SYSC_perf_event_open.SyS_perf_event_open.entry_SYSCALL_64_fastpath 1984 ±173% +1307.0% 27918 ± 71% latency_stats.max.perf_event_alloc.SYSC_perf_event_open.SyS_perf_event_open.entry_SYSCALL_64_fastpath 1984 ±173% +1307.0% 27918 ± 71% latency_stats.sum.perf_event_alloc.SYSC_perf_event_open.SyS_perf_event_open.entry_SYSCALL_64_fastpath 6894619 ± 5% +15.5% 7961219 ± 1% cpuidle.C1-BDW.time 84207 ± 5% +12.3% 94570 ± 3% cpuidle.C1-BDW.usage 35423874 ± 14% +24.1% 43971600 ± 5% cpuidle.POLL.time 3743 ± 7% +17.0% 4381 ± 3% cpuidle.POLL.usage 6.09 ± 1% +3.9% 6.33 ± 1% turbostat.%Busy 123.75 ± 2% +8.0% 133.67 ± 1% turbostat.Avg_MHz 19.55 ± 0% +1.4% 19.83 ± 0% turbostat.PkgWatt 10.90 ± 0% +1.5% 11.07 ± 0% turbostat.RAMWatt 908.10 ± 31% +58.2% 1436 ± 14% sched_debug.cfs_rq:/.exec_clock.min 242.71 ± 3% -8.6% 221.94 ± 6% sched_debug.cfs_rq:/.load_avg.min 8612 ± 2% +12.3% 9671 ± 3% sched_debug.cfs_rq:/.min_vruntime.avg 4872 ± 10% +29.6% 6312 ± 3% sched_debug.cfs_rq:/.min_vruntime.min 332.71 ±144% -87.5% 41.50 ± 8% sched_debug.cfs_rq:/.runnable_load_avg.max -9518 ± -5% -8.4% -8721 ± -6% sched_debug.cfs_rq:/.spread0.min 115.00 ± 5% -10.9% 102.50 ± 2% sched_debug.cfs_rq:/.util_avg.min 328.42 ±147% -90.2% 32.17 ± 13% sched_debug.cpu.cpu_load[0].max 79.95 ±147% -89.1% 8.69 ± 17% sched_debug.cpu.cpu_load[0].stddev 311.85 ± 5% -12.2% 273.88 ± 12% sched_debug.cpu.curr->pid.avg 0.46 ± 8% -17.1% 0.38 ± 7% sched_debug.cpu.nr_running.stddev 7.013e+10 ± 1% +34.8% 9.454e+10 ± 1% perf-stat.branch-instructions 0.73 ± 2% -15.7% 0.61 ± 3% perf-stat.branch-miss-rate% 5.109e+08 ± 2% +13.6% 5.802e+08 ± 3% perf-stat.branch-misses 5.566e+11 ± 0% +9.9% 6.117e+11 ± 1% perf-stat.cpu-cycles 9913 ± 3% -4.0% 9521 ± 3% perf-stat.cpu-migrations 0.17 ± 3% -10.9% 0.15 ± 0% perf-stat.dTLB-load-miss-rate% 1.072e+11 ± 3% +11.1% 1.191e+11 ± 2% perf-stat.dTLB-loads 69.70 ± 0% +2.5% 71.47 ± 0% perf-stat.iTLB-load-miss-rate% 48688123 ± 0% -1.2% 48109913 ± 0% perf-stat.iTLB-load-misses 21172777 ± 2% -9.3% 19208560 ± 1% perf-stat.iTLB-loads 3.912e+11 ± 1% +22.9% 4.807e+11 ± 1% perf-stat.instructions 8035 ± 1% +24.4% 9993 ± 2% perf-stat.instructions-per-iTLB-miss 0.70 ± 2% +11.8% 0.79 ± 1% perf-stat.ipc 2.14 ± 16% +218.8% 6.82 ± 1% perf-profile.calltrace.cycles-pp.__block_write_begin_int.iomap_write_begin.iomap_write_actor.iomap_apply.iomap_file_buffered_write 4.44 ± 7% -11.5% 3.93 ± 8% perf-profile.calltrace.cycles-pp.__irqentry_text_start.cpuidle_enter.call_cpuidle.cpu_startup_entry.start_secondary 0.94 ± 14% -100.0% 0.00 ± -1% perf-profile.calltrace.cycles-pp.__lru_cache_add.lru_cache_add.add_to_page_cache_lru.pagecache_get_page.grab_cache_page_write_begin 0.00 ± -1% +Inf% 1.57 ± 5% perf-profile.calltrace.cycles-pp.__pagevec_release.clean_bdev_aliases.__block_write_begin_int.iomap_write_begin.iomap_write_actor 2.43 ± 10% -31.1% 1.67 ± 9% perf-profile.calltrace.cycles-pp.add_to_page_cache_lru.pagecache_get_page.grab_cache_page_write_begin.iomap_write_begin.iomap_write_actor 0.97 ± 5% -22.3% 0.75 ± 8% perf-profile.calltrace.cycles-pp.ast_imageblit.soft_cursor.bit_cursor.fb_flashcursor.process_one_work 0.97 ± 5% -22.3% 0.75 ± 8% perf-profile.calltrace.cycles-pp.bit_cursor.fb_flashcursor.process_one_work.worker_thread.kthread 1.84 ± 18% -40.7% 1.09 ± 33% perf-profile.calltrace.cycles-pp.call_console_drivers.console_unlock.vprintk_emit.vprintk_default.printk 0.00 ± -1% +Inf% 5.12 ± 1% perf-profile.calltrace.cycles-pp.clean_bdev_aliases.__block_write_begin_int.iomap_write_begin.iomap_write_actor.iomap_apply 0.74 ± 21% -24.3% 0.56 ± 12% perf-profile.calltrace.cycles-pp.clear_page_dirty_for_io.write_cache_pages.xfs_vm_writepages.do_writepages.__writeback_single_inode 1.84 ± 18% -40.7% 1.09 ± 33% perf-profile.calltrace.cycles-pp.console_unlock.vprintk_emit.vprintk_default.printk.perf_duration_warn 0.97 ± 5% -22.3% 0.75 ± 8% perf-profile.calltrace.cycles-pp.fb_flashcursor.process_one_work.worker_thread.kthread.ret_from_fork 0.00 ± -1% +Inf% 3.35 ± 3% perf-profile.calltrace.cycles-pp.find_get_pages.pagevec_lookup.clean_bdev_aliases.__block_write_begin_int.iomap_write_begin 7.20 ± 13% +52.9% 11.01 ± 3% perf-profile.calltrace.cycles-pp.iomap_write_begin.iomap_write_actor.iomap_apply.iomap_file_buffered_write.xfs_file_buffered_aio_write 1.74 ± 6% -13.1% 1.52 ± 3% perf-profile.calltrace.cycles-pp.irq_exit.smp_apic_timer_interrupt.__irqentry_text_start.cpuidle_enter.call_cpuidle 0.00 ± -1% +Inf% 1.36 ± 9% perf-profile.calltrace.cycles-pp.lru_add_drain_cpu.__pagevec_release.clean_bdev_aliases.__block_write_begin_int.iomap_write_begin 0.95 ± 13% -100.0% 0.00 ± -1% perf-profile.calltrace.cycles-pp.lru_cache_add.add_to_page_cache_lru.pagecache_get_page.grab_cache_page_write_begin.iomap_write_begin 0.94 ± 4% -20.4% 0.75 ± 8% perf-profile.calltrace.cycles-pp.memcpy_erms.ast_imageblit.soft_cursor.bit_cursor.fb_flashcursor 0.00 ± -1% +Inf% 3.36 ± 3% perf-profile.calltrace.cycles-pp.pagevec_lookup.clean_bdev_aliases.__block_write_begin_int.iomap_write_begin.iomap_write_actor 0.78 ± 17% -100.0% 0.00 ± -1% perf-profile.calltrace.cycles-pp.pagevec_lru_move_fn.__lru_cache_add.lru_cache_add.add_to_page_cache_lru.pagecache_get_page 0.00 ± -1% +Inf% 1.29 ± 8% perf-profile.calltrace.cycles-pp.pagevec_lru_move_fn.lru_add_drain_cpu.__pagevec_release.clean_bdev_aliases.__block_write_begin_int 1.84 ± 18% -40.7% 1.09 ± 33% perf-profile.calltrace.cycles-pp.perf_duration_warn.irq_work_run_list.irq_work_run.smp_irq_work_interrupt.irq_work_interrupt 6.71 ± 20% +80.3% 12.10 ± 39% perf-profile.calltrace.cycles-pp.poll_idle.cpuidle_enter_state.cpuidle_enter.call_cpuidle.cpu_startup_entry 1.84 ± 18% -40.7% 1.09 ± 33% perf-profile.calltrace.cycles-pp.printk.perf_duration_warn.irq_work_run_list.irq_work_run.smp_irq_work_interrupt 0.00 ± -1% +Inf% 1.81 ± 8% perf-profile.calltrace.cycles-pp.radix_tree_next_chunk.find_get_pages.pagevec_lookup.clean_bdev_aliases.__block_write_begin_int 1.72 ± 17% -41.4% 1.01 ± 33% perf-profile.calltrace.cycles-pp.serial8250_console_putchar.uart_console_write.serial8250_console_write.univ8250_console_write.call_console_drivers 1.76 ± 17% -41.1% 1.04 ± 33% perf-profile.calltrace.cycles-pp.serial8250_console_write.univ8250_console_write.call_console_drivers.console_unlock.vprintk_emit 4.34 ± 7% -12.1% 3.81 ± 7% perf-profile.calltrace.cycles-pp.smp_apic_timer_interrupt.__irqentry_text_start.cpuidle_enter.call_cpuidle.cpu_startup_entry 0.97 ± 5% -22.3% 0.75 ± 8% perf-profile.calltrace.cycles-pp.soft_cursor.bit_cursor.fb_flashcursor.process_one_work.worker_thread 1.06 ± 7% -16.2% 0.89 ± 9% perf-profile.calltrace.cycles-pp.tick_nohz_stop_sched_tick.__tick_nohz_idle_enter.tick_nohz_irq_exit.irq_exit.smp_apic_timer_interrupt 1.72 ± 17% -41.4% 1.01 ± 33% perf-profile.calltrace.cycles-pp.uart_console_write.serial8250_console_write.univ8250_console_write.call_console_drivers.console_unlock 1.76 ± 17% -41.1% 1.04 ± 33% perf-profile.calltrace.cycles-pp.univ8250_console_write.call_console_drivers.console_unlock.vprintk_emit.vprintk_default 1.84 ± 18% -40.7% 1.09 ± 33% perf-profile.calltrace.cycles-pp.vprintk_default.printk.perf_duration_warn.irq_work_run_list.irq_work_run 1.84 ± 18% -40.7% 1.09 ± 33% perf-profile.calltrace.cycles-pp.vprintk_emit.vprintk_default.printk.perf_duration_warn.irq_work_run_list 1.56 ± 10% -38.2% 0.97 ± 33% perf-profile.calltrace.cycles-pp.wait_for_xmitr.serial8250_console_putchar.uart_console_write.serial8250_console_write.univ8250_console_write 2.15 ± 16% +218.7% 6.84 ± 1% perf-profile.children.cycles-pp.__block_write_begin_int 0.77 ± 23% -37.9% 0.48 ± 13% perf-profile.children.cycles-pp.__const_udelay 4.83 ± 4% -10.1% 4.34 ± 7% perf-profile.children.cycles-pp.__irqentry_text_start 0.94 ± 14% -83.4% 0.16 ± 15% perf-profile.children.cycles-pp.__lru_cache_add 0.12 ± 30% +1288.9% 1.67 ± 5% perf-profile.children.cycles-pp.__pagevec_release 2.44 ± 9% -31.4% 1.68 ± 10% perf-profile.children.cycles-pp.add_to_page_cache_lru 1.04 ± 5% -21.6% 0.81 ± 7% perf-profile.children.cycles-pp.ast_imageblit 0.97 ± 5% -22.3% 0.75 ± 8% perf-profile.children.cycles-pp.bit_cursor 0.00 ± -1% +Inf% 5.12 ± 1% perf-profile.children.cycles-pp.clean_bdev_aliases 0.97 ± 5% -22.3% 0.75 ± 8% perf-profile.children.cycles-pp.fb_flashcursor 0.00 ± -1% +Inf% 3.36 ± 3% perf-profile.children.cycles-pp.find_get_pages 0.95 ± 12% -21.1% 0.75 ± 10% perf-profile.children.cycles-pp.io_serial_in 7.20 ± 13% +52.9% 11.01 ± 3% perf-profile.children.cycles-pp.iomap_write_begin 1.90 ± 9% -9.8% 1.71 ± 8% perf-profile.children.cycles-pp.local_apic_timer_interrupt 0.00 ± -1% +Inf% 1.37 ± 9% perf-profile.children.cycles-pp.lru_add_drain_cpu 0.96 ± 14% -82.9% 0.16 ± 16% perf-profile.children.cycles-pp.lru_cache_add 0.95 ± 5% -20.1% 0.76 ± 8% perf-profile.children.cycles-pp.memcpy_erms 5.11 ± 11% -21.4% 4.02 ± 6% perf-profile.children.cycles-pp.pagecache_get_page 0.00 ± -1% +Inf% 3.37 ± 3% perf-profile.children.cycles-pp.pagevec_lookup 0.79 ± 16% +65.6% 1.30 ± 7% perf-profile.children.cycles-pp.pagevec_lru_move_fn 6.71 ± 20% +80.4% 12.10 ± 39% perf-profile.children.cycles-pp.poll_idle 0.06 ± 58% +3083.3% 1.91 ± 8% perf-profile.children.cycles-pp.radix_tree_next_chunk 1.72 ± 17% -27.8% 1.24 ± 8% perf-profile.children.cycles-pp.serial8250_console_putchar 1.76 ± 17% -27.4% 1.28 ± 8% perf-profile.children.cycles-pp.serial8250_console_write 4.74 ± 4% -10.6% 4.23 ± 6% perf-profile.children.cycles-pp.smp_apic_timer_interrupt 0.97 ± 5% -22.3% 0.75 ± 8% perf-profile.children.cycles-pp.soft_cursor 1.15 ± 5% -13.6% 0.99 ± 9% perf-profile.children.cycles-pp.tick_nohz_stop_sched_tick 1.72 ± 17% -27.8% 1.24 ± 8% perf-profile.children.cycles-pp.uart_console_write 1.76 ± 17% -27.4% 1.28 ± 8% perf-profile.children.cycles-pp.univ8250_console_write 1.72 ± 17% -28.6% 1.23 ± 9% perf-profile.children.cycles-pp.wait_for_xmitr 0.00 ± -1% +Inf% 1.55 ± 6% perf-profile.self.cycles-pp.find_get_pages 0.95 ± 12% -21.1% 0.75 ± 10% perf-profile.self.cycles-pp.io_serial_in 0.95 ± 5% -20.1% 0.76 ± 8% perf-profile.self.cycles-pp.memcpy_erms 6.71 ± 20% +80.4% 12.10 ± 39% perf-profile.self.cycles-pp.poll_idle 0.06 ± 58% +3083.3% 1.91 ± 8% perf-profile.self.cycles-pp.radix_tree_next_chunk fio.time.system_time 80 O+-O--O--O--O-------------------------------------------O-----O--------O | O O O O O O O O O O O O O O O O | 70 ++ | 60 *+.*..*..*..*..*..*..*..*..*..*..*..*.*..*..*..*..*..*..*..*..*..*..*..* | | 50 ++ | | | 40 ++ | | | 30 ++ | 20 ++ | | | 10 ++ | | | 0 ++------------------------------------------------------------------O--+ fio.time.percent_of_cpu_this_job_got 30 ++---------------------------------------------------------------------+ O O O O O O O O O O O O O O O O O O O O O O O O 25 ++ | | .*..*..*..*..*..*..*..*..*..*..*.*..*..*..*..*..*..*..*..*..*..*..* *..*. | 20 ++ | | | 15 ++ | | | 10 ++ | | | | | 5 ++ | | | 0 ++------------------------------------------------------------------O--+ [*] bisect-good sample [O] bisect-bad sample 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. Thanks, Ying Huang