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Date: Tue, 8 Aug 2017 09:31:13 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Huang Ying <ying.huang@...el.com>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>,
Johannes Weiner <hannes@...xchg.org>,
Minchan Kim <minchan@...nel.org>,
Hugh Dickins <hughd@...gle.com>, Shaohua Li <shli@...nel.org>,
Rik van Riel <riel@...hat.com>,
Andrea Arcangeli <aarcange@...hat.com>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
Dan Williams <dan.j.williams@...el.com>,
Jens Axboe <axboe@...nel.dk>, Michal Hocko <mhocko@...nel.org>,
Vishal L Verma <vishal.l.verma@...el.com>,
Andrew Morton <akpm@...ux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [lkp-robot] [mm, THP, swap] 27ff9bf7cd: vm-scalability.throughput
-3% regression
Greeting,
FYI, we noticed a -3% regression of vm-scalability.throughput due to commit:
commit: 27ff9bf7cdf588eda950f5ddfe8a6f0045258c58 ("mm, THP, swap: make reuse_swap_page() works for THP swapped out")
https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
in testcase: vm-scalability
on test machine: 88 threads Intel(R) Xeon(R) CPU E5-2699 v4 @ 2.20GHz with 128G memory
with following parameters:
runtime: 300s
size: 8T
test: anon-cow-seq
cpufreq_governor: performance
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/01org/lkp-tests.git
cd lkp-tests
bin/lkp install job.yaml # job file is attached in this email
bin/lkp run job.yaml
testcase/path_params/tbox_group/run: vm-scalability/300s-8T-anon-cow-seq-performance/lkp-bdw-ep2
91c807e922afbb73 27ff9bf7cdf588eda950f5ddfe
---------------- --------------------------
%stddev change %stddev
\ | \
350099 346898 vm-scalability.median
31125270 -3% 30202484 vm-scalability.throughput
7.846e+09 -4% 7.568e+09 vm-scalability.workload
0.04 ± 4% -26% 0.03 ± 9% vm-scalability.median_stddev
212213 ± 4% 84% 391164 vm-scalability.time.voluntary_context_switches
171709 8% 185688 vm-scalability.time.involuntary_context_switches
9936 10124 vm-scalability.time.system_time
7302 7237 vm-scalability.time.percent_of_cpu_this_job_got
11544055 11272539 vm-scalability.time.minor_page_faults
12152 11810 vm-scalability.time.user_time
2558212 ± 3% -32% 1734828 ± 3% interrupts.CAL:Function_call_interrupts
62707 -3% 60767 pmeter.performance_per_watt
8843 ± 13% 32% 11632 ± 11% vmstat.system.cs
100508 97669 vmstat.system.in
0 1e+04 9948 ± 17% latency_stats.max.io_schedule.__lock_page.do_huge_pmd_wp_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
20099 ± 88% -1e+04 6788 ± 73% latency_stats.max.call_rwsem_down_read_failed.page_lock_anon_vma_read.do_huge_pmd_numa_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
0 8e+06 7773763 latency_stats.sum.io_schedule.__lock_page.do_huge_pmd_wp_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
39557 ± 21% -3e+04 6076 ± 24% latency_stats.sum.call_rwsem_down_read_failed.page_lock_anon_vma_read.rmap_walk_anon.rmap_walk.try_to_unmap.migrate_pages.migrate_misplaced_page.__handle_mm_fault.handle_mm_fault.__do_page_fault.do_page_fault.page_fault
0.36 66% 0.60 perf-stat.node-store-miss-rate%
96588646 55% 1.494e+08 perf-stat.node-store-misses
2.624e+09 47% 3.868e+09 perf-stat.node-loads
3.328e+09 ± 3% 44% 4.787e+09 perf-stat.node-load-misses
139122 ± 3% 40% 194820 perf-stat.cpu-migrations
2682774 ± 13% 32% 3537536 ± 11% perf-stat.context-switches
1.106e+08 ± 3% 9% 1.211e+08 ± 4% perf-stat.iTLB-load-misses
0.00 8% 0.00 perf-stat.dTLB-load-miss-rate%
0.01 5% 0.01 perf-stat.branch-miss-rate%
55.13 4% 57.26 perf-stat.iTLB-load-miss-rate%
0.00 3% 0.00 perf-stat.dTLB-store-miss-rate%
2.38 3% 2.46 perf-stat.cpi
27.21 27.70 perf-stat.cache-miss-rate%
1.087e+09 1.106e+09 perf-stat.branch-misses
4.403e+11 4.357e+11 perf-stat.cache-references
12092547 11842335 perf-stat.minor-faults
12092547 11842319 perf-stat.page-faults
0.42 0.41 perf-stat.ipc
2.129e+12 -3% 2.059e+12 perf-stat.dTLB-stores
8.182e+12 -3% 7.906e+12 perf-stat.branch-instructions
2.571e+13 -3% 2.484e+13 perf-stat.instructions
5.747e+12 -3% 5.549e+12 perf-stat.dTLB-loads
2.659e+10 -7% 2.475e+10 perf-stat.node-stores
232836 ± 4% -12% 205592 ± 4% perf-stat.instructions-per-iTLB-miss
vm-scalability.time.user_time
12300 ++------------------------------------------------------------------+
| * * * |
12200 ++: .*. .*.*. : .* : .*.* * *.|
|: : *. * * *. .* : : * : : : * : :: : *
12100 ++ : : : : *. + .*.*. : : + : : : : : : : : |
* :: : : * *.* :+ * :: : : * |
12000 ++ * * * * * |
| |
11900 ++ |
| O O O |
11800 ++ O O O O O O O O O O O O O |
| |
11700 ++ O O O |
O O O O |
11600 ++------------------------------------------------------------------+
vm-scalability.time.voluntary_context_switches
450000 ++-----------------------------------------------------------------+
O O O |
400000 ++ O O O O O O O O O O O O |
| O O O O O O O O |
| |
350000 ++ |
| |
300000 ++ |
| |
250000 ++ |
| *.. |
|.*. + .*. .*. .*.*.*
200000 *+ *.*.* *.*.*.*. .*.*. .*.* *.*.*.* *.*.*..*.*.* |
| *.*.* *. |
150000 ++-----------------------------------------------------------------+
[*] 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,
Xiaolong
View attachment "config-4.13.0-rc3-00211-g27ff9bf" of type "text/plain" (161003 bytes)
View attachment "job-script" of type "text/plain" (7060 bytes)
View attachment "job.yaml" of type "text/plain" (4643 bytes)
View attachment "reproduce" of type "text/plain" (9174 bytes)
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