linux-kernel - [LKP] [mm] 7d5b506f3c2: -3.9% pigz.time.minor_page

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Date:	Thu, 12 Feb 2015 09:35:26 +0800
From:	Huang Ying <ying.huang@...el.com>
To:	Ebru Akagunduz <ebru.akagunduz@...il.com>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: [LKP] [mm] 7d5b506f3c2: -3.9% pigz.time.minor_page_faults

FYI, we noticed the below changes on

git://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
commit 7d5b506f3c295ff81e34235544a9e6ac143743c1 ("mm: incorporate read-only pages into transparent huge pages")


testbox/testcase/testparams: xps2/pigz/performance-100%-512K

c3916839649ddb3c  7d5b506f3c295ff81e34235544  
----------------  --------------------------  
         %stddev     %change         %stddev
             \          |                \  
     27105 ±  0%      -3.9%      26056 ±  1%  pigz.time.minor_page_faults
      0.93 ± 49%     -55.0%       0.42 ± 17%  perf-profile.cpu-cycles.enqueue_task.activate_task.ttwu_do_activate.try_to_wake_up.default_wake_function
      0.83 ± 43%     -49.5%       0.42 ±  9%  perf-profile.cpu-cycles.try_to_wake_up.default_wake_function.autoremove_wake_function.__wake_up_common.__wake_up_sync_key
      2.53 ± 37%     -41.0%       1.49 ±  6%  perf-profile.cpu-cycles.__alloc_pages_nodemask.alloc_pages_current.pipe_write.new_sync_write.vfs_write
      0.77 ± 47%     -49.0%       0.40 ±  2%  perf-profile.cpu-cycles.autoremove_wake_function.__wake_up_common.__wake_up_sync_key.pipe_read.new_sync_read
      0.77 ± 47%     -49.4%       0.39 ±  3%  perf-profile.cpu-cycles.default_wake_function.autoremove_wake_function.__wake_up_common.__wake_up_sync_key.pipe_read
      0.77 ± 47%     -46.1%       0.42 ± 10%  perf-profile.cpu-cycles.__wake_up_common.__wake_up_sync_key.pipe_read.new_sync_read.__vfs_read
      1.62 ± 37%     -40.8%       0.96 ± 14%  perf-profile.cpu-cycles.get_page_from_freelist.__alloc_pages_nodemask.alloc_pages_current.pipe_write.new_sync_write
      0.78 ± 18%     -47.7%       0.40 ± 16%  perf-profile.cpu-cycles.run_timer_softirq.__do_softirq.irq_exit.do_IRQ.ret_from_intr
      2.78 ± 32%     -35.1%       1.80 ±  8%  perf-profile.cpu-cycles.alloc_pages_current.pipe_write.new_sync_write.vfs_write.sys_write
      1.09 ± 28%     -35.5%       0.71 ± 23%  perf-profile.cpu-cycles.put_page.anon_pipe_buf_release.pipe_read.new_sync_read.__vfs_read
      1.48 ± 15%     -33.5%       0.98 ± 17%  perf-profile.cpu-cycles.__do_softirq.irq_exit.do_IRQ.ret_from_intr
      1.63 ± 20%     -30.9%       1.12 ± 14%  perf-profile.cpu-cycles.anon_pipe_buf_release.pipe_read.new_sync_read.__vfs_read.vfs_read
     15.76 ± 10%     +27.5%      20.09 ±  6%  perf-profile.cpu-cycles.tick_program_event.hrtimer_interrupt.hpet_interrupt_handler.handle_irq_event_percpu.handle_irq_event
     15.61 ± 10%     +26.8%      19.79 ±  6%  perf-profile.cpu-cycles.clockevents_program_event.tick_program_event.hrtimer_interrupt.hpet_interrupt_handler.handle_irq_event_percpu
     15.21 ±  9%     +27.9%      19.45 ±  6%  perf-profile.cpu-cycles.hpet_msi_next_event.clockevents_program_event.tick_program_event.hrtimer_interrupt.hpet_interrupt_handler
      1758 ± 36%     +46.6%       2578 ±  3%  sched_debug.cpu#0.curr->pid
      2.43 ± 10%     +27.9%       3.11 ±  3%  perf-profile.cpu-cycles.irq_exit.smp_apic_timer_interrupt.apic_timer_interrupt
       130 ±  4%     +13.8%        148 ±  5%  sched_debug.cpu#3.load
       130 ±  4%     +13.8%        148 ±  5%  sched_debug.cfs_rq[3]:/.load
      2498 ±  5%     +10.4%       2757 ±  6%  slabinfo.kmalloc-256.num_objs

xps2: Nehalem
Memory: 4G

                             pigz.time.minor_page_faults

  27400 ++------------------------------------------------------------------+
  27200 ++                 *.                          *.*             .*   |
        |  .*.            +  *                        +   + *   *   *.*  + .*
  27000 *+*   *.*.*.*.*.**    +   .*.*.*.*.*.*.*.*. .*     * : : + +      * |
  26800 ++                     *.*                 *         : :  *         |
        |                                                     *             |
  26600 ++                                                                  |
  26400 ++                       O             O                            |
  26200 ++                         O       O                                |
        |           O O  O                                                  |
  26000 ++O                                                                 |
  25800 ++  O O         O  O O O       O O   O                              |
        |       O O                                                         |
  25600 O+                           O                                      |
  25400 ++------------------------------------------------------------------+


        [*] bisect-good sample
        [O] bisect-bad  sample

To reproduce:

        apt-get install ruby ruby-oj
        git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/lkp-tests.git
        cd lkp-tests
        bin/setup-local job.yaml # the job file attached in this email
        bin/run-local   job.yaml


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,
Huang, Ying


View attachment "job.yaml" of type "text/plain" (1740 bytes)

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