From: kernel test robot <oliver.sang@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: <oe-lkp@lists.linux.dev>, <lkp@intel.com>, <oliver.sang@intel.com>
Subject: [tglx-devel:locking/futex] [x86/vdso] 698a86a85c: stress-ng.priv-instr.ops_per_sec 5.8% improvement
Date: Wed, 27 May 2026 13:03:24 +0800 [thread overview]
Message-ID: <202605271217.16dfca4d-lkp@intel.com> (raw)
Hello,
kernel test robot noticed a 5.8% improvement of stress-ng.priv-instr.ops_per_sec on:
commit: 698a86a85c4db4b800faa8a2890810ff9cec2f79 ("x86/vdso: Implement __vdso_futex_robust_try_unlock()")
https://git.kernel.org/cgit/linux/kernel/git/tglx/devel.git locking/futex
testcase: stress-ng
config: x86_64-rhel-9.4
compiler: gcc-14
test machine: 192 threads 2 sockets Intel(R) Xeon(R) 6740E CPU @ 2.4GHz (Sierra Forest) with 256G memory
parameters:
nr_threads: 100%
testtime: 60s
test: priv-instr
cpufreq_governor: performance
we notice the config diff which seems reasonable:
--- /pkg/linux/x86_64-rhel-9.4/gcc-14/35b728574c5b70b8223b53787bdbc40e55ca8ac4/.config 2026-05-25 13:01:14.615107724 +0800
+++ /pkg/linux/x86_64-rhel-9.4/gcc-14/698a86a85c4db4b800faa8a2890810ff9cec2f79/.config 2026-05-25 11:39:09.283994568 +0800
@@ -281,6 +281,8 @@ CONFIG_FUTEX=y
CONFIG_FUTEX_PI=y
CONFIG_FUTEX_PRIVATE_HASH=y
CONFIG_FUTEX_MPOL=y
+CONFIG_HAVE_FUTEX_ROBUST_UNLOCK=y
+CONFIG_FUTEX_ROBUST_UNLOCK=y
CONFIG_EPOLL=y
CONFIG_SIGNALFD=y
CONFIG_TIMERFD=y
Details are as below:
-------------------------------------------------------------------------------------------------->
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20260527/202605271217.16dfca4d-lkp@intel.com
=========================================================================================
compiler/cpufreq_governor/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime:
gcc-14/performance/x86_64-rhel-9.4/100%/debian-13-x86_64-20250902.cgz/lkp-srf-2sp3/priv-instr/stress-ng/60s
commit:
35b728574c ("x86/vdso: Prepare for robust futex unlock support")
698a86a85c ("x86/vdso: Implement __vdso_futex_robust_try_unlock()")
35b728574c5b70b8 698a86a85c4db4b800faa8a2890
---------------- ---------------------------
%stddev %change %stddev
\ | \
28468 -5.6% 26878 stress-ng.priv-instr.nanosecs_per_privileged_op_trap
3.983e+08 +5.8% 4.214e+08 stress-ng.priv-instr.ops
6643685 +5.8% 7028732 stress-ng.priv-instr.ops_per_sec
60.10 +0.0% 60.10 stress-ng.time.elapsed_time
60.10 +0.0% 60.10 stress-ng.time.elapsed_time.max
47894 -0.0% 47889 stress-ng.time.involuntary_context_switches
7847 +0.0% 7848 stress-ng.time.maximum_resident_set_size
18927 ± 2% +0.7% 19061 ± 2% stress-ng.time.minor_page_faults
4096 +0.0% 4096 stress-ng.time.page_size
19086 +0.0% 19087 stress-ng.time.percent_of_cpu_this_job_got
11320 -0.1% 11312 stress-ng.time.system_time
150.74 +5.9% 159.68 stress-ng.time.user_time
671.60 +1.0% 678.17 ± 3% stress-ng.time.voluntary_context_switches
0.00 +3e+102% 3.00 ±107% perf-c2c.DRAM.local
0.00 +8.5e+103% 85.33 ±111% perf-c2c.DRAM.remote
0.00 +6.6e+104% 660.17 ±100% perf-c2c.HITM.local
0.00 +8.2e+103% 81.83 ±110% perf-c2c.HITM.remote
0.00 +7.4e+104% 742.00 ±101% perf-c2c.HITM.total
247011 ± 28% -8.9% 225103 ± 35% numa-numastat.node0.local_node
373383 ± 15% -1.0% 369611 ± 13% numa-numastat.node0.numa_hit
126371 ± 47% +14.4% 144508 ± 30% numa-numastat.node0.other_node
367783 ± 18% +5.5% 387890 ± 20% numa-numastat.node1.local_node
440260 ± 12% +0.5% 442288 ± 11% numa-numastat.node1.numa_hit
72476 ± 81% -24.9% 54397 ± 80% numa-numastat.node1.other_node
3.27 -0.0 3.26 mpstat.cpu.all.idle%
0.09 +0.0 0.09 ± 3% mpstat.cpu.all.irq%
0.00 ± 52% +0.0 0.00 ± 31% mpstat.cpu.all.soft%
95.15 -0.1 95.08 mpstat.cpu.all.sys%
1.49 +0.1 1.56 mpstat.cpu.all.usr%
3.00 +0.0% 3.00 mpstat.max_utilization.seconds
100.00 +0.0% 100.00 mpstat.max_utilization_pct
60.10 +0.0% 60.10 time.elapsed_time
60.10 +0.0% 60.10 time.elapsed_time.max
47894 -0.0% 47889 time.involuntary_context_switches
7847 +0.0% 7848 time.maximum_resident_set_size
18927 ± 2% +0.7% 19061 ± 2% time.minor_page_faults
4096 +0.0% 4096 time.page_size
19086 +0.0% 19087 time.percent_of_cpu_this_job_got
11320 -0.1% 11312 time.system_time
150.74 +5.9% 159.68 time.user_time
671.60 +1.0% 678.17 ± 3% time.voluntary_context_switches
6.08 ± 9% -7.8% 5.61 ± 13% vmstat.cpu.id
92.50 +0.5% 92.93 vmstat.cpu.sy
1.42 +2.0% 1.45 ± 2% vmstat.cpu.us
0.33 +0.5% 0.33 vmstat.io.bi
4.00 +0.0% 4.00 vmstat.memory.buff
4549331 -0.0% 4547648 vmstat.memory.cache
2.514e+08 -0.0% 2.514e+08 vmstat.memory.free
181.12 +0.9% 182.71 vmstat.procs.r
2505 ± 2% -3.0% 2430 ± 2% vmstat.system.cs
443254 +0.4% 445179 vmstat.system.in
0.07 ± 5% -3.7% 0.07 ± 4% perf-sched.sch_delay.avg.ms.[unknown].[unknown].[unknown].[unknown].[unknown]
10.80 ± 42% -6.8% 10.06 ± 38% perf-sched.sch_delay.max.ms.[unknown].[unknown].[unknown].[unknown].[unknown]
0.07 ± 5% -3.7% 0.07 ± 4% perf-sched.total_sch_delay.average.ms
10.80 ± 42% -6.8% 10.06 ± 38% perf-sched.total_sch_delay.max.ms
176.52 ± 2% -0.6% 175.50 ± 5% perf-sched.total_wait_and_delay.average.ms
7255 ± 2% +1.9% 7392 ± 6% perf-sched.total_wait_and_delay.count.ms
4979 +0.0% 4981 perf-sched.total_wait_and_delay.max.ms
176.45 ± 2% -0.6% 175.43 ± 5% perf-sched.total_wait_time.average.ms
4979 +0.0% 4981 perf-sched.total_wait_time.max.ms
176.52 ± 2% -0.6% 175.50 ± 5% perf-sched.wait_and_delay.avg.ms.[unknown].[unknown].[unknown].[unknown].[unknown]
7255 ± 2% +1.9% 7392 ± 6% perf-sched.wait_and_delay.count.[unknown].[unknown].[unknown].[unknown].[unknown]
4979 +0.0% 4981 perf-sched.wait_and_delay.max.ms.[unknown].[unknown].[unknown].[unknown].[unknown]
176.45 ± 2% -0.6% 175.43 ± 5% perf-sched.wait_time.avg.ms.[unknown].[unknown].[unknown].[unknown].[unknown]
4979 +0.0% 4981 perf-sched.wait_time.max.ms.[unknown].[unknown].[unknown].[unknown].[unknown]
2004 -0.3% 1999 perf-stat.i.context-switches
192058 -0.0% 192055 perf-stat.i.cpu-clock
311.00 -0.7% 308.78 perf-stat.i.cpu-migrations
0.02 ± 99% +23.7% 0.02 ± 93% perf-stat.i.major-faults
3937 ± 3% +2.8% 4049 ± 4% perf-stat.i.minor-faults
3937 ± 3% +2.8% 4049 ± 4% perf-stat.i.page-faults
192058 -0.0% 192055 perf-stat.i.task-clock
1972 -0.2% 1968 perf-stat.ps.context-switches
188859 -0.0% 188847 perf-stat.ps.cpu-clock
305.80 -0.7% 303.61 perf-stat.ps.cpu-migrations
0.02 ± 96% +25.7% 0.02 ± 92% perf-stat.ps.major-faults
3872 ± 3% +2.8% 3979 ± 4% perf-stat.ps.minor-faults
3872 ± 3% +2.8% 3979 ± 4% perf-stat.ps.page-faults
188859 -0.0% 188847 perf-stat.ps.task-clock
1852 ± 81% +66.9% 3093 turbostat.Avg_MHz
57.87 ± 81% +38.8 96.62 turbostat.Busy%
1920 ± 81% +66.7% 3201 turbostat.Bzy_MHz
1.99 ± 82% +1.2 3.15 ± 5% turbostat.C1%
1.99 ± 82% +58.0% 3.14 ± 5% turbostat.CPU%c1
30.20 ± 81% +68.3% 50.83 turbostat.CoreTmp
0.03 ± 81% +66.7% 0.05 turbostat.IPC
16893263 ± 81% +66.7% 28163412 turbostat.IRQ
4937639 ± 81% +66.8% 8234664 turbostat.NMI
30.60 ± 81% +66.1% 50.83 turbostat.PkgTmp
171.65 ± 81% +67.0% 286.58 turbostat.PkgWatt
9.03 ± 81% +66.6% 15.05 turbostat.RAMWatt
0.01 ± 81% +66.7% 0.02 turbostat.SysWatt
1440 ± 81% +66.7% 2400 turbostat.TSC_MHz
1584 ± 6% -8.7% 1447 sched_debug.cfs_rq:/.runnable_avg.max
162.28 ± 5% -8.7% 148.14 ± 4% sched_debug.cfs_rq:/.runnable_avg.stddev
1025 ± 4% +7.6% 1103 ± 4% sched_debug.cfs_rq:/.util_avg.max
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.
--
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki
reply other threads:[~2026-05-27 5:03 UTC|newest]
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