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Date: Tue, 21 Jul 2020 08:56:09 +0800
From: kernel test robot <rong.a.chen@...el.com>
To: Mike Kravetz <mike.kravetz@...cle.com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Michal Hocko <mhocko@...nel.org>,
Hugh Dickins <hughd@...gle.com>,
Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
"Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
Andrea Arcangeli <aarcange@...hat.com>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
Davidlohr Bueso <dave@...olabs.net>,
Prakash Sangappa <prakash.sangappa@...cle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Mike Kravetz <mike.kravetz@...cle.com>,
kernel test robot <rong.a.chen@...el.com>, lkp@...ts.01.org
Subject: [hugetlbfs] 878308e2e0: vm-scalability.throughput 1.2% improvement
Greeting,
FYI, we noticed a 1.2% improvement of vm-scalability.throughput due to commit:
commit: 878308e2e0d003e923a0fad51657441916ca1a86 ("[RFC PATCH 2/3] hugetlbfs: Only take i_mmap_rwsem when sharing is possible")
url: https://github.com/0day-ci/linux/commits/Mike-Kravetz/hugetlbfs-address-fault-time-regression/20200707-043055
base: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git 9ebcfadb0610322ac537dd7aa5d9cbc2b2894c68
in testcase: vm-scalability
on test machine: 96 threads Intel(R) Xeon(R) Gold 6252 CPU @ 2.10GHz with 256G memory
with following parameters:
runtime: 300s
size: 8T
test: anon-cow-seq-hugetlb
cpufreq_governor: performance
ucode: 0x5002f01
test-description: The motivation behind this suite is to exercise functions and regions of the mm/ of the Linux kernel which are of interest to us.
test-url: https://git.kernel.org/cgit/linux/kernel/git/wfg/vm-scalability.git/
Details are as below:
-------------------------------------------------------------------------------------------------->
To reproduce:
git clone https://github.com/intel/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/runtime/size/tbox_group/test/testcase/ucode:
gcc-9/performance/x86_64-rhel-8.3/debian-10.4-x86_64-20200603.cgz/300s/8T/lkp-csl-2sp6/anon-cow-seq-hugetlb/vm-scalability/0x5002f01
commit:
e1f9bcc75b ("Revert: "hugetlbfs: Use i_mmap_rwsem to address page fault/truncate race"")
878308e2e0 ("hugetlbfs: Only take i_mmap_rwsem when sharing is possible")
e1f9bcc75b135fa7 878308e2e0d003e923a0fad5165
---------------- ---------------------------
%stddev %change %stddev
\ | \
368149 +1.2% 372740 vm-scalability.median
2.08 ± 6% +1.1 3.21 ± 6% vm-scalability.median_stddev%
36859123 +1.2% 37316599 vm-scalability.throughput
7183 +2.3% 7351 vm-scalability.time.percent_of_cpu_this_job_got
13255 +1.3% 13426 vm-scalability.time.system_time
8653 +2.9% 8904 vm-scalability.time.user_time
353403 -87.2% 45099 vm-scalability.time.voluntary_context_switches
2215 -2.0% 2170 boot-time.idle
24601711 ± 19% +27.9% 31454336 ± 9% meminfo.DirectMap2M
58850 ± 2% -10.7% 52572 ± 2% cpuidle.C1E.usage
1542818 -15.3% 1306149 cpuidle.C6.usage
3422 ± 11% -13.6% 2957 ± 7% slabinfo.fsnotify_mark_connector.active_objs
3422 ± 11% -13.6% 2957 ± 7% slabinfo.fsnotify_mark_connector.num_objs
13429 ± 10% -19.8% 10769 ± 4% softirqs.CPU0.SCHED
545104 -26.3% 401941 softirqs.SCHED
24.00 -8.3% 22.00 vmstat.cpu.id
29.00 +3.4% 30.00 vmstat.cpu.us
4618 -43.5% 2609 ± 2% vmstat.system.cs
76078 +2.7% 78129 vmstat.system.in
580.50 ± 17% -33.2% 387.75 ± 9% interrupts.CPU15.CAL:Function_call_interrupts
519.75 ± 20% -25.5% 387.25 ± 11% interrupts.CPU19.CAL:Function_call_interrupts
163.50 ± 77% -90.1% 16.25 ±100% interrupts.CPU24.TLB:TLB_shootdowns
69.00 ± 10% +40.9% 97.25 ± 16% interrupts.CPU25.RES:Rescheduling_interrupts
727.75 ± 41% -42.3% 420.00 ± 28% interrupts.CPU31.CAL:Function_call_interrupts
159.25 ± 61% -57.9% 67.00 ± 32% interrupts.CPU31.RES:Rescheduling_interrupts
9.25 ±142% +518.9% 57.25 ± 61% interrupts.CPU39.TLB:TLB_shootdowns
746.50 ± 8% -25.6% 555.25 ± 10% interrupts.CPU7.CAL:Function_call_interrupts
99.50 ± 18% -25.1% 74.50 ± 28% interrupts.CPU73.RES:Rescheduling_interrupts
208.25 ± 36% -68.3% 66.00 ± 44% interrupts.CPU82.RES:Rescheduling_interrupts
612.75 ± 34% -35.4% 395.75 ± 22% interrupts.CPU88.CAL:Function_call_interrupts
509479 ± 44% -52.4% 242707 ± 32% sched_debug.cfs_rq:/.load.max
9228443 ± 10% +23.1% 11358951 sched_debug.cfs_rq:/.min_vruntime.max
538248 ± 13% +60.0% 861238 ± 15% sched_debug.cfs_rq:/.min_vruntime.stddev
18.97 ± 9% +33.8% 25.40 ± 6% sched_debug.cfs_rq:/.nr_spread_over.avg
88.65 ± 33% +64.1% 145.50 ± 26% sched_debug.cfs_rq:/.nr_spread_over.max
18.49 ± 13% +45.9% 26.98 ± 19% sched_debug.cfs_rq:/.nr_spread_over.stddev
223.44 ± 11% +19.6% 267.14 ± 4% sched_debug.cfs_rq:/.runnable_avg.stddev
701309 ± 21% +83.4% 1286114 ± 13% sched_debug.cfs_rq:/.spread0.max
538445 ± 13% +59.9% 861184 ± 15% sched_debug.cfs_rq:/.spread0.stddev
222.23 ± 11% +17.7% 261.61 ± 5% sched_debug.cfs_rq:/.util_avg.stddev
296.77 ± 5% +22.6% 363.91 ± 9% sched_debug.cfs_rq:/.util_est_enqueued.stddev
2299 ±100% +404.8% 11607 ± 52% sched_debug.cpu.max_idle_balance_cost.stddev
0.27 ± 6% +27.7% 0.35 ± 23% sched_debug.cpu.nr_running.stddev
7774 ± 9% -30.7% 5387 ± 2% sched_debug.cpu.nr_switches.avg
5083 ± 10% -61.2% 1972 ± 8% sched_debug.cpu.nr_switches.min
0.02 ± 53% +159.3% 0.05 ± 41% sched_debug.cpu.nr_uninterruptible.avg
6771 ± 11% -34.5% 4435 ± 2% sched_debug.cpu.sched_count.avg
4287 ± 13% -72.0% 1201 ± 10% sched_debug.cpu.sched_count.min
3032 ± 14% +23.7% 3752 ± 4% sched_debug.cpu.sched_count.stddev
3015 ± 11% -42.6% 1731 ± 2% sched_debug.cpu.sched_goidle.avg
1853 ± 13% -82.3% 328.67 ± 18% sched_debug.cpu.sched_goidle.min
3128 ± 11% -37.8% 1944 ± 3% sched_debug.cpu.ttwu_count.avg
1007 ± 12% -35.6% 648.58 ± 10% sched_debug.cpu.ttwu_count.min
783.48 ± 10% +19.2% 933.93 ± 6% sched_debug.cpu.ttwu_local.avg
vm-scalability.throughput
3.76e+07 +----------------------------------------------------------------+
| O |
3.74e+07 |-+O O O O O O O O O O O O O O |
| O O O O O O O |
3.72e+07 |-+ +.. .+.. |
3.7e+07 |-+ .+ + .+..+. .+..+ +.. .+.. |
| +. + .+..+ +. +. + +..+..+.+..|
3.68e+07 |-+ +.. .. +. |
| : + |
3.66e+07 |-+ : |
3.64e+07 |-+ : |
| : |
3.62e+07 |..: |
| + |
3.6e+07 +----------------------------------------------------------------+
vm-scalability.time.voluntary_context_switches
400000 +------------------------------------------------------------------+
| .+. .+.. |
350000 |..+. +..+. +..+.+..+..+..+..+.+..+..+..+.+..+..+..+..+.+..+..|
| |
300000 |-+ |
250000 |-+ |
| |
200000 |-+ |
| |
150000 |-+ |
100000 |-+ |
| |
50000 |-+ O O O O O O O O O O O O O O O O |
| O O O O O O |
0 +------------------------------------------------------------------+
[*] 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,
Rong Chen
View attachment "config-5.8.0-rc3-00002-g878308e2e0d00" of type "text/plain" (158415 bytes)
View attachment "job-script" of type "text/plain" (7910 bytes)
View attachment "job.yaml" of type "text/plain" (5403 bytes)
View attachment "reproduce" of type "text/plain" (6784 bytes)
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