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Date: Tue, 6 Sep 2016 14:42:15 +0800
From: kernel test robot <xiaolong.ye@...el.com>
To: Manfred Spraul <manfred@...orfullife.com>
Cc: Stephen Rothwell <sfr@...b.auug.org.au>,
"H. Peter Anvin" <hpa@...or.com>,
Peter Zijlstra <peterz@...radead.org>,
Davidlohr Bueso <dave@...olabs.net>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...e.hu>,
Andrew Morton <akpm@...ux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>, lkp@...org
Subject: [lkp] [ipc/sem.c] 99ac0dfffc: aim9.shared_memory.ops_per_sec -8.9%
regression
FYI, we noticed a -8.9% regression of aim9.shared_memory.ops_per_sec due to commit:
commit 99ac0dfffcfb34326a880e90e06c30a2a882c692 ("ipc/sem.c: fix complex_count vs. simple op race")
https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
in testcase: aim9
on test machine: 4 threads Intel(R) Core(TM) i3-3220 CPU @ 3.30GHz with 4G memory
with following parameters:
testtime: 300s
test: shared_memory
cpufreq_governor: performance
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.
Details are as below:
-------------------------------------------------------------------------------------------------->
To reproduce:
git clone git://git.kernel.org/pub/scm/linux/kernel/git/wfg/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/tbox_group/test/testcase/testtime:
gcc-6/performance/x86_64-rhel/debian-x86_64-2015-02-07.cgz/lkp-ivb-d03/shared_memory/aim9/300s
commit:
5ae37d6d64 ("config/android: Remove CONFIG_IPV6_PRIVACY")
99ac0dfffc ("ipc/sem.c: fix complex_count vs. simple op race")
5ae37d6d64c605ee 99ac0dfffcfb34326a880e90e0
---------------- --------------------------
fail:runs %reproduction fail:runs
| | |
%stddev %change %stddev
\ | \
1398301 ± 1% -8.9% 1274143 ± 0% aim9.shared_memory.ops_per_sec
4195942 ± 1% -8.9% 3823474 ± 0% aim9.time.minor_page_faults
9013 ± 6% -19.5% 7252 ± 5% cpuidle.POLL.usage
76659 ± 17% +23.9% 95015 ± 11% meminfo.Committed_AS
15205 ± 6% +13.3% 17233 ± 5% meminfo.Mapped
-569.95 ±-33% +137.7% -1354 ±-64% sched_debug.cfs_rq:/.spread0.avg
5050 ± 5% -9.7% 4560 ± 7% sched_debug.cpu.nr_switches.min
55865 ± 84% -76.9% 12913 ± 78% latency_stats.avg.max
56056 ± 83% -75.5% 13750 ± 70% latency_stats.max.max
14318 ± 69% -70.2% 4271 ± 61% latency_stats.sum.kthread_park.watchdog_park_threads.watchdog_enable_all_cpus.proc_watchdog_update.proc_watchdog_common.proc_nmi_watchdog.proc_sys_call_handler.proc_sys_write.__vfs_write.vfs_write.SyS_write.entry_SYSCALL_64_fastpath
2.676e+09 ± 15% -20.9% 2.117e+09 ± 8% perf-stat.cache-references
1.66 ± 2% -10.0% 1.49 ± 1% perf-stat.ipc
4205943 ± 1% -8.9% 3833165 ± 0% perf-stat.minor-faults
4205945 ± 1% -8.9% 3833164 ± 0% perf-stat.page-faults
1.06 ± 15% +172.9% 2.89 ± 12% perf-profile.calltrace.cycles-pp.pid_vnr.SYSC_semtimedop.sys_semop.entry_SYSCALL_64_fastpath
1.39 ± 10% +131.6% 3.21 ± 12% perf-profile.children.cycles-pp.pid_vnr
1.15 ± 2% -10.8% 1.03 ± 7% perf-profile.children.cycles-pp.wake_const_ops
9.82 ± 2% +64.9% 16.20 ± 6% perf-profile.self.cycles-pp.SYSC_semtimedop
2.24 ± 3% -12.3% 1.97 ± 5% perf-profile.self.cycles-pp.do_smart_update
6.41 ± 1% -8.3% 5.88 ± 3% perf-profile.self.cycles-pp.entry_SYSCALL_64_fastpath
4.12 ± 8% -19.8% 3.31 ± 8% perf-profile.self.cycles-pp.ipc_has_perm
1.39 ± 10% +131.6% 3.21 ± 12% perf-profile.self.cycles-pp.pid_vnr
1.20 ± 15% -32.8% 0.81 ± 5% perf-profile.self.cycles-pp.selinux_ipc_permission
1.15 ± 2% -10.8% 1.03 ± 7% perf-profile.self.cycles-pp.wake_const_ops
perf-stat.page-faults
4.7e+06 ++----------------------------------------------------------------+
4.6e+06 *+** **.* *.*.* |
| : : : : : |
4.5e+06 ++ : : : : : |
4.4e+06 ++ : : : : : |
| : : :: : |
4.3e+06 ++ *.*. *.*.*. : ** *.* * .*.* .*.* *.|
4.2e+06 ++ * **.*.*.**.*.* + + *.* * + : *
4.1e+06 ++ * * |
| |
4e+06 ++ |
3.9e+06 ++ |
O O O O O O O OO O O |
3.8e+06 ++OO O O |
3.7e+06 ++------------O--O------------------------------------------------+
perf-stat.minor-faults
4.7e+06 ++----------------------------------------------------------------+
4.6e+06 *+** **.* *.*.* |
| : : : : : |
4.5e+06 ++ : : : : : |
4.4e+06 ++ : : : : : |
| : : :: : |
4.3e+06 ++ *.*. *.*.*. : ** *.* * .*.* .*.* *.|
4.2e+06 ++ * **.*.*.**.*.* + + *.* * + : *
4.1e+06 ++ * * |
| |
4e+06 ++ |
3.9e+06 ++ |
O O O O O O O OO O O |
3.8e+06 ++OO O O |
3.7e+06 ++------------O--O------------------------------------------------+
aim9.shared_memory.ops_per_sec
1.45e+06 ++---------------------------------------------------------------+
|.* .*.* .*. *.*. *. .** |
* * + *.*.* .* * * * : *. *.*.* .*.* *.|
1.4e+06 ++ * *.*.*.**.*.** : + * * : : *
| * :: |
| * |
1.35e+06 ++ |
| |
1.3e+06 ++ |
| O O O |
O O O O O OO O O |
1.25e+06 ++ O O O |
| O O |
| |
1.2e+06 ++---------------------------------------------------------------+
aim9.time.minor_page_faults
4.4e+06 ++----------------------------------------------------------------+
| |
4.3e+06 *+**.*.* .*.* **.*.**.*.*.**.* *. * |
| + * + .* + : * .*.*.* + * :+|
4.2e+06 ++ * **.*.* *.*.* : + * * +: *
4.1e+06 ++ * * |
| |
4e+06 ++ |
| |
3.9e+06 ++ |
3.8e+06 ++ O O O O O O OO O O |
O OO O |
3.7e+06 ++ O O O |
| |
3.6e+06 ++----------------------------------------------------------------+
[*] bisect-good sample
[O] bisect-bad sample
Thanks,
Xiaolong
View attachment "config-4.8.0-rc3-00135-g99ac0df" of type "text/plain" (152831 bytes)
View attachment "job.yaml" of type "text/plain" (3682 bytes)
View attachment "reproduce" of type "text/plain" (103 bytes)
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