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Date: Tue, 23 Dec 2014 11:57:13 +0300
From: Kirill Tkhai <tkhai@...dex.ru>
To: Huang Ying <ying.huang@...el.com>,
Kirill Tkhai <ktkhai@...allels.com>
Cc: Ingo Molnar <mingo@...nel.org>,
LKML <linux-kernel@...r.kernel.org>, LKP ML <lkp@...org>
Subject: Re: [LKP] [sched] a15b12ac36a: -46.9% time.voluntary_context_switches +1.5% will-it-scale.per_process_ops
Hi, Huang,
what do these digits mean? What test does?
23.12.2014, 08:16, "Huang Ying" <ying.huang@...el.com>:
> FYI, we noticed the below changes on
>
> commit a15b12ac36ad4e7b856a4ae54937ae26a51aebad ("sched: Do not stop cpu in set_cpus_allowed_ptr() if task is not running")
>
> testbox/testcase/testparams: lkp-g5/will-it-scale/performance-lock1
>
> 1ba93d42727c4400 a15b12ac36ad4e7b856a4ae549
> ---------------- --------------------------
> %stddev %change %stddev
> \ | \
> 1517261 ± 0% +1.5% 1539994 ± 0% will-it-scale.per_process_ops
> 247 ± 30% +131.8% 573 ± 49% sched_debug.cpu#61.ttwu_count
> 225 ± 22% +142.8% 546 ± 34% sched_debug.cpu#81.ttwu_local
> 15115 ± 44% +37.3% 20746 ± 40% numa-meminfo.node7.Active
> 1028 ± 38% +115.3% 2214 ± 36% sched_debug.cpu#16.ttwu_local
> 2 ± 19% +133.3% 5 ± 43% sched_debug.cpu#89.cpu_load[3]
> 21 ± 45% +88.2% 40 ± 23% sched_debug.cfs_rq[99]:/.tg_load_contrib
> 414 ± 33% +98.6% 823 ± 28% sched_debug.cpu#81.ttwu_count
> 4 ± 10% +88.2% 8 ± 12% sched_debug.cfs_rq[33]:/.runnable_load_avg
> 22 ± 26% +80.9% 40 ± 24% sched_debug.cfs_rq[103]:/.tg_load_contrib
> 7 ± 17% -41.4% 4 ± 25% sched_debug.cfs_rq[41]:/.load
> 7 ± 17% -37.9% 4 ± 19% sched_debug.cpu#41.load
> 3 ± 22% +106.7% 7 ± 10% sched_debug.cfs_rq[36]:/.runnable_load_avg
> 174 ± 13% +48.7% 259 ± 31% sched_debug.cpu#112.ttwu_count
> 4 ± 19% +88.9% 8 ± 5% sched_debug.cfs_rq[35]:/.runnable_load_avg
> 260 ± 10% +55.6% 405 ± 26% numa-vmstat.node3.nr_anon_pages
> 1042 ± 10% +56.0% 1626 ± 26% numa-meminfo.node3.AnonPages
> 26 ± 22% +74.3% 45 ± 16% sched_debug.cfs_rq[65]:/.tg_load_contrib
> 21 ± 43% +71.3% 37 ± 26% sched_debug.cfs_rq[100]:/.tg_load_contrib
> 3686 ± 21% +40.2% 5167 ± 19% sched_debug.cpu#16.ttwu_count
> 142 ± 9% +34.4% 191 ± 24% sched_debug.cpu#112.ttwu_local
> 5 ± 18% +69.6% 9 ± 15% sched_debug.cfs_rq[35]:/.load
> 2 ± 30% +100.0% 5 ± 37% sched_debug.cpu#106.cpu_load[1]
> 3 ± 23% +100.0% 6 ± 48% sched_debug.cpu#106.cpu_load[2]
> 5 ± 18% +69.6% 9 ± 15% sched_debug.cpu#35.load
> 9 ± 20% +48.6% 13 ± 16% sched_debug.cfs_rq[7]:/.runnable_load_avg
> 1727 ± 15% +43.9% 2484 ± 30% sched_debug.cpu#34.ttwu_local
> 10 ± 17% -40.5% 6 ± 13% sched_debug.cpu#41.cpu_load[0]
> 10 ± 14% -29.3% 7 ± 5% sched_debug.cpu#45.cpu_load[4]
> 10 ± 17% -33.3% 7 ± 10% sched_debug.cpu#41.cpu_load[1]
> 6121 ± 8% +56.7% 9595 ± 30% sched_debug.cpu#13.sched_goidle
> 13 ± 8% -25.9% 10 ± 17% sched_debug.cpu#39.cpu_load[2]
> 12 ± 16% -24.0% 9 ± 15% sched_debug.cpu#37.cpu_load[2]
> 492 ± 17% -21.3% 387 ± 24% sched_debug.cpu#46.ttwu_count
> 3761 ± 11% -23.9% 2863 ± 15% sched_debug.cpu#93.curr->pid
> 570 ± 19% +43.2% 816 ± 17% sched_debug.cpu#86.ttwu_count
> 5279 ± 8% +63.5% 8631 ± 33% sched_debug.cpu#13.ttwu_count
> 377 ± 22% -28.6% 269 ± 14% sched_debug.cpu#46.ttwu_local
> 5396 ± 10% +29.9% 7007 ± 14% sched_debug.cpu#16.sched_goidle
> 1959 ± 12% +36.9% 2683 ± 15% numa-vmstat.node2.nr_slab_reclaimable
> 7839 ± 12% +37.0% 10736 ± 15% numa-meminfo.node2.SReclaimable
> 5 ± 15% +66.7% 8 ± 9% sched_debug.cfs_rq[33]:/.load
> 5 ± 25% +47.8% 8 ± 10% sched_debug.cfs_rq[37]:/.load
> 2 ± 0% +87.5% 3 ± 34% sched_debug.cpu#89.cpu_load[4]
> 5 ± 15% +66.7% 8 ± 9% sched_debug.cpu#33.load
> 6 ± 23% +41.7% 8 ± 10% sched_debug.cpu#37.load
> 8 ± 10% -26.5% 6 ± 6% sched_debug.cpu#51.cpu_load[1]
> 7300 ± 37% +63.6% 11943 ± 16% softirqs.TASKLET
> 2984 ± 6% +43.1% 4271 ± 23% sched_debug.cpu#20.ttwu_count
> 328 ± 4% +40.5% 462 ± 25% sched_debug.cpu#26.ttwu_local
> 10 ± 7% -27.5% 7 ± 5% sched_debug.cpu#43.cpu_load[3]
> 9 ± 8% -30.8% 6 ± 6% sched_debug.cpu#41.cpu_load[3]
> 9 ± 8% -27.0% 6 ± 6% sched_debug.cpu#41.cpu_load[4]
> 10 ± 14% -32.5% 6 ± 6% sched_debug.cpu#41.cpu_load[2]
> 16292 ± 6% +42.8% 23260 ± 25% sched_debug.cpu#13.nr_switches
> 14 ± 28% +55.9% 23 ± 8% sched_debug.cpu#99.cpu_load[0]
> 5 ± 8% +28.6% 6 ± 12% sched_debug.cpu#17.load
> 13 ± 7% -23.1% 10 ± 12% sched_debug.cpu#39.cpu_load[3]
> 7 ± 10% -35.7% 4 ± 11% sched_debug.cfs_rq[45]:/.runnable_load_avg
> 5076 ± 13% -21.8% 3970 ± 11% numa-vmstat.node0.nr_slab_unreclaimable
> 20306 ± 13% -21.8% 15886 ± 11% numa-meminfo.node0.SUnreclaim
> 10 ± 10% -28.6% 7 ± 6% sched_debug.cpu#45.cpu_load[3]
> 11 ± 11% -29.5% 7 ± 14% sched_debug.cpu#45.cpu_load[1]
> 10 ± 12% -26.8% 7 ± 6% sched_debug.cpu#44.cpu_load[1]
> 10 ± 10% -28.6% 7 ± 6% sched_debug.cpu#44.cpu_load[0]
> 7 ± 17% +48.3% 10 ± 7% sched_debug.cfs_rq[11]:/.runnable_load_avg
> 11 ± 12% -34.1% 7 ± 11% sched_debug.cpu#47.cpu_load[0]
> 10 ± 10% -27.9% 7 ± 5% sched_debug.cpu#47.cpu_load[1]
> 10 ± 8% -26.8% 7 ± 11% sched_debug.cpu#47.cpu_load[2]
> 10 ± 8% -28.6% 7 ± 14% sched_debug.cpu#43.cpu_load[0]
> 10 ± 10% -27.9% 7 ± 10% sched_debug.cpu#43.cpu_load[1]
> 10 ± 10% -28.6% 7 ± 6% sched_debug.cpu#43.cpu_load[2]
> 12940 ± 3% +49.8% 19387 ± 35% numa-meminfo.node2.Active(anon)
> 3235 ± 2% +49.8% 4844 ± 35% numa-vmstat.node2.nr_active_anon
> 17 ± 17% +36.6% 24 ± 9% sched_debug.cpu#97.cpu_load[2]
> 14725 ± 8% +21.8% 17928 ± 11% sched_debug.cpu#16.nr_switches
> 667 ± 10% +45.3% 969 ± 22% sched_debug.cpu#17.ttwu_local
> 3257 ± 5% +22.4% 3988 ± 11% sched_debug.cpu#118.curr->pid
> 3144 ± 15% -20.7% 2493 ± 8% sched_debug.cpu#95.curr->pid
> 2192 ± 11% +50.9% 3308 ± 37% sched_debug.cpu#18.ttwu_count
> 6 ± 11% +37.5% 8 ± 19% sched_debug.cfs_rq[22]:/.load
> 12 ± 5% +27.1% 15 ± 8% sched_debug.cpu#5.cpu_load[1]
> 11 ± 12% -23.4% 9 ± 13% sched_debug.cpu#37.cpu_load[3]
> 6 ± 11% +37.5% 8 ± 19% sched_debug.cpu#22.load
> 8 ± 8% -25.0% 6 ± 0% sched_debug.cpu#51.cpu_load[2]
> 7 ± 6% -20.0% 6 ± 11% sched_debug.cpu#55.cpu_load[3]
> 11 ± 9% -17.4% 9 ± 9% sched_debug.cpu#39.cpu_load[4]
> 12 ± 5% -22.9% 9 ± 11% sched_debug.cpu#38.cpu_load[3]
> 420 ± 13% +43.0% 601 ± 9% sched_debug.cpu#30.ttwu_local
> 1682 ± 14% +38.5% 2329 ± 17% numa-meminfo.node7.AnonPages
> 423 ± 13% +37.0% 579 ± 16% numa-vmstat.node7.nr_anon_pages
> 15 ± 13% +41.9% 22 ± 5% sched_debug.cpu#99.cpu_load[1]
> 6 ± 20% +44.0% 9 ± 13% sched_debug.cfs_rq[19]:/.runnable_load_avg
> 9 ± 4% -24.3% 7 ± 0% sched_debug.cpu#43.cpu_load[4]
> 6341 ± 7% -19.6% 5100 ± 16% sched_debug.cpu#43.curr->pid
> 2577 ± 11% -11.9% 2270 ± 10% sched_debug.cpu#33.ttwu_count
> 13 ± 6% -18.5% 11 ± 12% sched_debug.cpu#40.cpu_load[2]
> 4828 ± 6% +23.8% 5979 ± 6% sched_debug.cpu#34.curr->pid
> 4351 ± 12% +33.9% 5824 ± 12% sched_debug.cpu#36.curr->pid
> 10 ± 8% -23.8% 8 ± 8% sched_debug.cpu#37.cpu_load[4]
> 10 ± 14% -28.6% 7 ± 6% sched_debug.cpu#45.cpu_load[2]
> 17 ± 22% +40.6% 24 ± 7% sched_debug.cpu#97.cpu_load[1]
> 11 ± 9% +21.3% 14 ± 5% sched_debug.cpu#7.cpu_load[2]
> 10 ± 8% -26.2% 7 ± 10% sched_debug.cpu#36.cpu_load[4]
> 12853 ± 2% +20.0% 15429 ± 11% numa-meminfo.node2.AnonPages
> 4744 ± 8% +30.8% 6204 ± 11% sched_debug.cpu#35.curr->pid
> 3214 ± 2% +20.0% 3856 ± 11% numa-vmstat.node2.nr_anon_pages
> 6181 ± 6% +24.9% 7718 ± 9% sched_debug.cpu#13.curr->pid
> 6675 ± 23% +27.5% 8510 ± 10% sched_debug.cfs_rq[91]:/.tg_load_avg
> 171261 ± 5% -22.2% 133177 ± 15% numa-numastat.node0.local_node
> 6589 ± 21% +29.3% 8522 ± 11% sched_debug.cfs_rq[89]:/.tg_load_avg
> 6508 ± 20% +28.0% 8331 ± 8% sched_debug.cfs_rq[88]:/.tg_load_avg
> 6598 ± 22% +29.2% 8525 ± 11% sched_debug.cfs_rq[90]:/.tg_load_avg
> 590 ± 13% -21.4% 464 ± 7% sched_debug.cpu#105.ttwu_local
> 175392 ± 5% -21.7% 137308 ± 14% numa-numastat.node0.numa_hit
> 11 ± 6% -18.2% 9 ± 7% sched_debug.cpu#38.cpu_load[4]
> 6643 ± 23% +27.4% 8465 ± 10% sched_debug.cfs_rq[94]:/.tg_load_avg
> 6764 ± 7% +13.8% 7695 ± 7% sched_debug.cpu#12.curr->pid
> 29 ± 28% +34.5% 39 ± 5% sched_debug.cfs_rq[98]:/.tg_load_contrib
> 1776 ± 7% +29.4% 2298 ± 13% sched_debug.cpu#11.ttwu_local
> 13 ± 0% -19.2% 10 ± 8% sched_debug.cpu#40.cpu_load[3]
> 7 ± 5% -17.2% 6 ± 0% sched_debug.cpu#51.cpu_load[3]
> 7371 ± 20% -18.0% 6045 ± 3% sched_debug.cpu#1.sched_goidle
> 26560 ± 2% +14.0% 30287 ± 7% numa-meminfo.node2.Slab
> 16161 ± 6% -9.4% 14646 ± 1% sched_debug.cfs_rq[27]:/.avg->runnable_avg_sum
> 351 ± 6% -9.3% 318 ± 1% sched_debug.cfs_rq[27]:/.tg_runnable_contrib
> 7753 ± 27% -22.9% 5976 ± 5% sched_debug.cpu#2.sched_goidle
> 3828 ± 9% +17.3% 4490 ± 6% sched_debug.cpu#23.sched_goidle
> 23925 ± 2% +23.0% 29419 ± 23% numa-meminfo.node2.Active
> 47 ± 6% -15.8% 40 ± 19% sched_debug.cpu#42.cpu_load[1]
> 282 ± 5% -9.7% 254 ± 7% sched_debug.cfs_rq[109]:/.tg_runnable_contrib
> 349 ± 5% -9.3% 317 ± 1% sched_debug.cfs_rq[26]:/.tg_runnable_contrib
> 6941 ± 3% +8.9% 7558 ± 7% sched_debug.cpu#61.nr_switches
> 16051 ± 5% -8.9% 14618 ± 1% sched_debug.cfs_rq[26]:/.avg->runnable_avg_sum
> 238944 ± 3% +9.2% 260958 ± 5% numa-vmstat.node2.numa_local
> 12966 ± 5% -9.5% 11732 ± 6% sched_debug.cfs_rq[109]:/.avg->runnable_avg_sum
> 1004 ± 3% +8.2% 1086 ± 4% sched_debug.cpu#118.sched_goidle
> 20746 ± 4% -8.4% 19000 ± 1% sched_debug.cfs_rq[45]:/.avg->runnable_avg_sum
> 451 ± 4% -8.3% 413 ± 1% sched_debug.cfs_rq[45]:/.tg_runnable_contrib
> 3538 ± 4% +17.2% 4147 ± 8% sched_debug.cpu#26.ttwu_count
> 16 ± 9% +13.8% 18 ± 2% sched_debug.cpu#99.cpu_load[3]
> 1531 ± 0% +11.3% 1704 ± 1% numa-meminfo.node7.KernelStack
> 3569 ± 3% +17.2% 4182 ± 10% sched_debug.cpu#24.sched_goidle
> 1820 ± 3% -12.5% 1594 ± 8% slabinfo.taskstats.num_objs
> 1819 ± 3% -12.4% 1594 ± 8% slabinfo.taskstats.active_objs
> 4006 ± 5% +19.1% 4769 ± 8% sched_debug.cpu#17.sched_goidle
> 21412 ± 19% -17.0% 17779 ± 3% sched_debug.cpu#2.nr_switches
> 16 ± 9% +24.2% 20 ± 4% sched_debug.cpu#99.cpu_load[2]
> 10493 ± 7% +13.3% 11890 ± 4% sched_debug.cpu#23.nr_switches
> 1207 ± 2% -46.9% 640 ± 4% time.voluntary_context_switches
>
> time.voluntary_context_switches
>
> 1300 ++-----------*--*--------------------*-------------------------------+
> *..*.*..*.. + *.*..*..*.*..*..* .*..*..*. .*..*.*..*.. |
> 1200 ++ * * *. *.*..*
> 1100 ++ |
> | |
> 1000 ++ |
> | |
> 900 ++ |
> | |
> 800 ++ |
> 700 ++ |
> O O O O O O O O O O O O O |
> 600 ++ O O O O O O O O O |
> | O |
> 500 ++-------------------------------------------------------------------+
>
> [*] 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.
>
Regards,
Kirill
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