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Subject[LKP] [mm] 7d5b506f3c2: -3.9% pigz.time.minor_page_faults
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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

---
testcase: pigz
default-monitors:
wait: pre-test
uptime:
iostat:
vmstat:
numa-numastat:
numa-vmstat:
numa-meminfo:
proc-vmstat:
proc-stat:
meminfo:
slabinfo:
interrupts:
lock_stat:
latency_stats:
softirqs:
bdi_dev_mapping:
diskstats:
nfsstat:
cpuidle:
cpufreq-stats:
turbostat:
pmeter:
sched_debug:
interval: 10
default_watchdogs:
watch-oom:
watchdog:
cpufreq_governor: performance
commit: f61b8d6d777dfb241ebe87478c5c82126ac8d687
model: Nehalem
memory: 4G
nr_ssd_partitions: 1
ssd_partitions: "/dev/disk/by-id/ata-INTEL_SSDSC2CW240A3_CVCV204303XB240CGN-part1"
swap_partitions:
rootfs_partition: "/dev/disk/by-id/ata-INTEL_SSDSC2CW240A3_CVCV204303XB240CGN-part2"
netconsole_port: 6665
perf-profile:
freq: 800
nr_threads: 100%
pigz:
blocksize: 512K
testbox: xps2
tbox_group: xps2
kconfig: x86_64-rhel
enqueue_time: 2015-02-11 08:54:24.084863795 +08:00
head_commit: f61b8d6d777dfb241ebe87478c5c82126ac8d687
base_commit: bfa76d49576599a4b9f9b7a71f23d73d6dcff735
branch: next/master
kernel: "/kernel/x86_64-rhel/f61b8d6d777dfb241ebe87478c5c82126ac8d687/vmlinuz-3.19.0-next-20150210-gf61b8d6"
user: lkp
queue: cyclic
rootfs: debian-x86_64-2015-02-07.cgz
result_root: "/result/xps2/pigz/performance-100%-512K/debian-x86_64-2015-02-07.cgz/x86_64-rhel/f61b8d6d777dfb241ebe87478c5c82126ac8d687/0"
job_file: "/lkp/scheduled/xps2/cyclic_pigz-performance-100%-512K-x86_64-rhel-HEAD-f61b8d6d777dfb241ebe87478c5c82126ac8d687-0-20150211-14981-iea6fd.yaml"
dequeue_time: 2015-02-11 09:08:52.086449889 +08:00
nr_cpu: "$(nproc)"
job_state: finished
loadavg: 6.38 5.04 2.28 1/133 5308
start_time: '1423616958'
end_time: '1423617259'
version: "/lkp/lkp/.src-20150210-213435"
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