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Message-ID: <202512181616.16b76cde-lkp@intel.com>
Date: Fri, 19 Dec 2025 14:21:49 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, <linux-kernel@...r.kernel.org>,
Andrew Morton <akpm@...ux-foundation.org>, Jason Gunthorpe <jgg@...dia.com>,
Alexander Gordeev <agordeev@...ux.ibm.com>, Al Viro
<viro@...iv.linux.org.uk>, Andreas Larsson <andreas@...sler.com>, "Andrey
Konovalov" <andreyknvl@...il.com>, Arnd Bergmann <arnd@...db.de>, Baolin Wang
<baolin.wang@...ux.alibaba.com>, Baoquan He <bhe@...hat.com>, "Chatre,
Reinette" <reinette.chatre@...el.com>, Christian Borntraeger
<borntraeger@...ux.ibm.com>, Christian Brauner <brauner@...nel.org>, "Dan
Williams" <dan.j.williams@...el.com>, Dave Jiang <dave.jiang@...el.com>,
"Dave Martin" <dave.martin@....com>, Dave Young <dyoung@...hat.com>, "David
Hildenbrand" <david@...hat.com>, "David S. Miller" <davem@...emloft.net>,
Dmitriy Vyukov <dvyukov@...gle.com>, Greg Kroah-Hartman
<gregkh@...uxfoundation.org>, Guo Ren <guoren@...nel.org>, Heiko Carstens
<hca@...ux.ibm.com>, Hugh Dickins <hughd@...gle.com>, James Morse
<james.morse@....com>, Jan Kara <jack@...e.cz>, Jann Horn <jannh@...gle.com>,
Jonathan Corbet <corbet@....net>, Kevin Tian <kevin.tian@...el.com>,
Konstantin Komarov <almaz.alexandrovich@...agon-software.com>, Liam Howlett
<liam.howlett@...cle.com>, "Luck, Tony" <tony.luck@...el.com>, Matthew Wilcox
<willy@...radead.org>, Michal Hocko <mhocko@...e.com>, Mike Rapoport
<rppt@...nel.org>, Muchun Song <muchun.song@...ux.dev>, Nicolas Pitre
<nico@...xnic.net>, Oscar Salvador <osalvador@...e.de>, Pedro Falcato
<pfalcato@...e.de>, Robin Murohy <robin.murphy@....com>, Sumanth Korikkar
<sumanthk@...ux.ibm.com>, Suren Baghdasaryan <surenb@...gle.com>, "Sven
Schnelle" <svens@...ux.ibm.com>, Thomas Bogendoerfer
<tsbogend@...ha.franken.de>, "Uladzislau Rezki (Sony)" <urezki@...il.com>,
Vasily Gorbik <gor@...ux.ibm.com>, Vishal Verma <vishal.l.verma@...el.com>,
Vivek Goyal <vgoyal@...hat.com>, Vlastimil Babka <vbabka@...e.cz>, "Will
Deacon" <will@...nel.org>, <oliver.sang@...el.com>
Subject: [linus:master] [mm] ab04945f91: stress-ng.fd-abuse.ops_per_sec
3.4% improvement
Hello,
kernel test robot noticed a 3.4% improvement of stress-ng.fd-abuse.ops_per_sec on:
commit: ab04945f91bcad1668af57bbb575771e794aea8d ("mm: update mem char driver to use mmap_prepare")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
testcase: stress-ng
config: x86_64-rhel-9.4
compiler: gcc-14
test machine: 256 threads 4 sockets INTEL(R) XEON(R) PLATINUM 8592+ (Emerald Rapids) with 256G memory
parameters:
nr_threads: 100%
testtime: 60s
test: fd-abuse
cpufreq_governor: performance
Details are as below:
-------------------------------------------------------------------------------------------------->
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20251218/202512181616.16b76cde-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-emr-2sp1/fd-abuse/stress-ng/60s
commit:
89646d9c74 ("mm: add shmem_zero_setup_desc()")
ab04945f91 ("mm: update mem char driver to use mmap_prepare")
89646d9c748c0902 ab04945f91bcad1668af57bbb57
---------------- ---------------------------
%stddev %change %stddev
\ | \
19.28 +2.8% 19.82 turbostat.RAMWatt
2438603 ± 3% -13.5% 2109471 ± 7% numa-numastat.node1.local_node
2517328 ± 4% -11.9% 2217162 ± 5% numa-numastat.node1.numa_hit
72858 ± 6% +91.5% 139519 ± 3% proc-vmstat.nr_slab_reclaimable
339884 +107.0% 703398 proc-vmstat.nr_slab_unreclaimable
20261925 ± 2% -25.3% 15142663 proc-vmstat.pgalloc_normal
18968240 ± 2% -31.6% 12978914 ± 2% proc-vmstat.pgfree
3.706e+09 +3.4% 3.833e+09 stress-ng.fd-abuse.ops
61777966 +3.4% 63895149 stress-ng.fd-abuse.ops_per_sec
285.34 +4.4% 297.95 stress-ng.time.user_time
16701 +2.7% 17144 stress-ng.time.voluntary_context_switches
8804549 +61.4% 14208934 meminfo.Committed_AS
291574 ± 6% +91.1% 557114 ± 3% meminfo.KReclaimable
12991379 ± 3% +16.6% 15149678 ± 2% meminfo.Memused
291574 ± 6% +91.1% 557114 ± 3% meminfo.SReclaimable
1353499 +107.7% 2811130 meminfo.SUnreclaim
1645073 +104.7% 3368244 meminfo.Slab
13335448 ± 3% +15.9% 15450436 ± 2% meminfo.max_used_kB
17516 ± 34% +97.4% 34572 ± 6% numa-vmstat.node0.nr_slab_reclaimable
88462 ± 6% +102.5% 179171 ± 2% numa-vmstat.node0.nr_slab_unreclaimable
66.79 ± 54% +106.9% 138.19 ± 33% numa-vmstat.node1.nr_anon_transparent_hugepages
16982 ± 18% +94.3% 32997 ± 19% numa-vmstat.node1.nr_slab_reclaimable
81860 ± 3% +113.2% 174536 ± 2% numa-vmstat.node1.nr_slab_unreclaimable
2521117 ± 4% -12.0% 2218931 ± 5% numa-vmstat.node1.numa_hit
2442392 ± 3% -13.6% 2111240 ± 7% numa-vmstat.node1.numa_local
19931 ± 28% +90.9% 38056 ± 7% numa-vmstat.node2.nr_slab_reclaimable
86088 ± 5% +99.7% 171897 numa-vmstat.node2.nr_slab_unreclaimable
18146 ± 12% +82.8% 33181 ± 13% numa-vmstat.node3.nr_slab_reclaimable
83060 ± 4% +111.5% 175660 ± 2% numa-vmstat.node3.nr_slab_unreclaimable
2.679e+10 +1.5% 2.718e+10 perf-stat.i.branch-instructions
43.06 +0.9 44.01 perf-stat.i.cache-miss-rate%
88883420 +5.0% 93333404 perf-stat.i.cache-misses
6.01 -1.2% 5.94 perf-stat.i.cpi
8654 -5.3% 8192 perf-stat.i.cycles-between-cache-misses
1.211e+11 +1.6% 1.23e+11 perf-stat.i.instructions
0.73 +3.5% 0.76 perf-stat.overall.MPKI
42.85 +0.9 43.75 perf-stat.overall.cache-miss-rate%
6.03 -1.3% 5.95 perf-stat.overall.cpi
8266 -4.7% 7879 perf-stat.overall.cycles-between-cache-misses
0.17 +1.3% 0.17 perf-stat.overall.ipc
2.635e+10 +1.4% 2.673e+10 perf-stat.ps.branch-instructions
86986582 +5.1% 91435274 perf-stat.ps.cache-misses
2.03e+08 +2.9% 2.09e+08 perf-stat.ps.cache-references
1.191e+11 +1.6% 1.21e+11 perf-stat.ps.instructions
7.248e+12 +1.6% 7.363e+12 perf-stat.total.instructions
70689 ± 34% +96.6% 138955 ± 6% numa-meminfo.node0.KReclaimable
70689 ± 34% +96.6% 138955 ± 6% numa-meminfo.node0.SReclaimable
356946 ± 6% +101.3% 718428 ± 3% numa-meminfo.node0.SUnreclaim
427635 ± 10% +100.5% 857383 ± 2% numa-meminfo.node0.Slab
139096 ± 54% +104.6% 284523 ± 33% numa-meminfo.node1.AnonHugePages
68643 ± 18% +93.3% 132663 ± 19% numa-meminfo.node1.KReclaimable
2076019 ± 6% +57.0% 3258377 ± 43% numa-meminfo.node1.MemUsed
68643 ± 18% +93.3% 132663 ± 19% numa-meminfo.node1.SReclaimable
330581 ± 3% +111.7% 699874 ± 2% numa-meminfo.node1.SUnreclaim
399224 ± 3% +108.5% 832538 ± 4% numa-meminfo.node1.Slab
80254 ± 27% +90.6% 152941 ± 7% numa-meminfo.node2.KReclaimable
80254 ± 27% +90.6% 152941 ± 7% numa-meminfo.node2.SReclaimable
347619 ± 4% +98.2% 689115 numa-meminfo.node2.SUnreclaim
427873 ± 7% +96.8% 842056 numa-meminfo.node2.Slab
73141 ± 11% +82.0% 133137 ± 13% numa-meminfo.node3.KReclaimable
3108062 ± 11% +41.5% 4398558 ± 26% numa-meminfo.node3.MemUsed
73141 ± 11% +82.0% 133137 ± 13% numa-meminfo.node3.SReclaimable
335184 ± 5% +110.2% 704492 ± 2% numa-meminfo.node3.SUnreclaim
408326 ± 5% +105.1% 837630 ± 3% numa-meminfo.node3.Slab
5.23 -1.9 3.31 perf-profile.calltrace.cycles-pp.stress_fd_lseek
46.32 -1.3 45.05 perf-profile.calltrace.cycles-pp.inode_sb_list_add.new_inode.__shmem_get_inode.__shmem_file_setup.shmem_zero_setup
46.38 -1.3 45.12 perf-profile.calltrace.cycles-pp.task_work_run.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe.__munmap
46.32 -1.3 45.06 perf-profile.calltrace.cycles-pp.dput.__fput.task_work_run.exit_to_user_mode_loop.do_syscall_64
46.34 -1.3 45.08 perf-profile.calltrace.cycles-pp.__fput.task_work_run.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe
46.44 -1.3 45.18 perf-profile.calltrace.cycles-pp.new_inode.__shmem_get_inode.__shmem_file_setup.shmem_zero_setup.__mmap_new_vma
46.54 -1.3 45.28 perf-profile.calltrace.cycles-pp.__shmem_get_inode.__shmem_file_setup.shmem_zero_setup.__mmap_new_vma.__mmap_region
46.30 -1.3 45.04 perf-profile.calltrace.cycles-pp.__dentry_kill.dput.__fput.task_work_run.exit_to_user_mode_loop
46.14 -1.3 44.88 perf-profile.calltrace.cycles-pp.evict.__dentry_kill.dput.__fput.task_work_run
45.84 -1.2 44.60 perf-profile.calltrace.cycles-pp.native_queued_spin_lock_slowpath._raw_spin_lock.evict.__dentry_kill.dput
45.99 -1.2 44.74 perf-profile.calltrace.cycles-pp._raw_spin_lock.evict.__dentry_kill.dput.__fput
0.67 +0.0 0.70 perf-profile.calltrace.cycles-pp.llseek
2.40 +0.0 2.44 perf-profile.calltrace.cycles-pp.mmap_region.do_mmap.vm_mmap_pgoff.ksys_mmap_pgoff.do_syscall_64
2.38 +0.0 2.43 perf-profile.calltrace.cycles-pp.__mmap_region.mmap_region.do_mmap.vm_mmap_pgoff.ksys_mmap_pgoff
2.54 +0.1 2.60 perf-profile.calltrace.cycles-pp.do_mmap.vm_mmap_pgoff.ksys_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe
0.75 ± 2% +0.1 0.81 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe
2.58 +0.1 2.64 perf-profile.calltrace.cycles-pp.ksys_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap
0.77 ± 2% +0.1 0.83 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe
2.56 +0.1 2.62 perf-profile.calltrace.cycles-pp.vm_mmap_pgoff.ksys_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap
1.02 +0.1 1.09 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.stress_fd_lseek
1.06 +0.1 1.14 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.stress_fd_lseek
44.33 +0.8 45.15 perf-profile.calltrace.cycles-pp.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe.__munmap
46.28 +0.8 47.11 perf-profile.calltrace.cycles-pp._raw_spin_lock.inode_sb_list_add.new_inode.__shmem_get_inode.__shmem_file_setup
46.20 +0.8 47.04 perf-profile.calltrace.cycles-pp.native_queued_spin_lock_slowpath._raw_spin_lock.inode_sb_list_add.new_inode.__shmem_get_inode
44.63 +0.8 45.47 perf-profile.calltrace.cycles-pp.shmem_zero_setup.__mmap_new_vma.__mmap_region.do_mmap.vm_mmap_pgoff
44.62 +0.8 45.47 perf-profile.calltrace.cycles-pp.__shmem_file_setup.shmem_zero_setup.__mmap_new_vma.__mmap_region.do_mmap
44.66 +0.8 45.51 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.__munmap
44.66 +0.8 45.51 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.__munmap
44.69 +0.8 45.53 perf-profile.calltrace.cycles-pp.__munmap
44.78 +0.9 45.63 perf-profile.calltrace.cycles-pp.__mmap_new_vma.__mmap_region.do_mmap.vm_mmap_pgoff.do_syscall_64
44.98 +0.9 45.84 perf-profile.calltrace.cycles-pp.__mmap_region.do_mmap.vm_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe
45.11 +0.9 45.97 perf-profile.calltrace.cycles-pp.vm_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap
45.09 +0.9 45.96 perf-profile.calltrace.cycles-pp.do_mmap.vm_mmap_pgoff.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap
47.74 +0.9 48.66 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mmap
47.74 +0.9 48.67 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.__mmap
47.80 +0.9 48.73 perf-profile.calltrace.cycles-pp.__mmap
0.00 +2.1 2.11 perf-profile.calltrace.cycles-pp.inode_sb_list_add.new_inode.__shmem_get_inode.__shmem_file_setup.shmem_zero_setup_desc
0.00 +2.1 2.12 perf-profile.calltrace.cycles-pp.new_inode.__shmem_get_inode.__shmem_file_setup.shmem_zero_setup_desc.__mmap_region
0.00 +2.1 2.12 perf-profile.calltrace.cycles-pp.__shmem_get_inode.__shmem_file_setup.shmem_zero_setup_desc.__mmap_region.mmap_region
0.00 +2.1 2.13 perf-profile.calltrace.cycles-pp.__shmem_file_setup.shmem_zero_setup_desc.__mmap_region.mmap_region.do_mmap
0.00 +2.1 2.13 perf-profile.calltrace.cycles-pp.shmem_zero_setup_desc.__mmap_region.mmap_region.do_mmap.vm_mmap_pgoff
5.24 -1.9 3.32 perf-profile.children.cycles-pp.stress_fd_lseek
46.39 -1.3 45.13 perf-profile.children.cycles-pp.task_work_run
46.73 -1.3 45.47 perf-profile.children.cycles-pp.shmem_zero_setup
46.30 -1.3 45.04 perf-profile.children.cycles-pp.__dentry_kill
46.48 -1.3 45.22 perf-profile.children.cycles-pp.exit_to_user_mode_loop
46.36 -1.3 45.11 perf-profile.children.cycles-pp.dput
46.14 -1.3 44.88 perf-profile.children.cycles-pp.evict
46.44 -1.2 45.20 perf-profile.children.cycles-pp.__fput
47.02 -1.2 45.78 perf-profile.children.cycles-pp.__mmap_new_vma
46.96 -1.2 45.72 perf-profile.children.cycles-pp.__munmap
92.11 -0.4 91.71 perf-profile.children.cycles-pp.native_queued_spin_lock_slowpath
92.39 -0.4 91.99 perf-profile.children.cycles-pp._raw_spin_lock
97.69 -0.1 97.58 perf-profile.children.cycles-pp.do_syscall_64
97.82 -0.1 97.71 perf-profile.children.cycles-pp.entry_SYSCALL_64_after_hwframe
0.08 -0.0 0.07 perf-profile.children.cycles-pp.__destroy_inode
0.11 +0.0 0.12 perf-profile.children.cycles-pp.kthread
0.11 +0.0 0.12 perf-profile.children.cycles-pp.ret_from_fork
0.11 +0.0 0.12 perf-profile.children.cycles-pp.ret_from_fork_asm
0.13 +0.0 0.14 perf-profile.children.cycles-pp.__fstat64
0.17 +0.0 0.18 perf-profile.children.cycles-pp.__x64_sys_pselect6
0.16 +0.0 0.17 perf-profile.children.cycles-pp.entry_SYSCALL_64_safe_stack
0.08 +0.0 0.09 perf-profile.children.cycles-pp.generic_perform_write
0.13 +0.0 0.14 perf-profile.children.cycles-pp.inet_listen
0.13 +0.0 0.14 perf-profile.children.cycles-pp.mas_store_gfp
0.08 +0.0 0.09 perf-profile.children.cycles-pp.mas_store_prealloc
0.11 ± 3% +0.0 0.12 perf-profile.children.cycles-pp.generic_file_write_iter
0.14 ± 2% +0.0 0.15 perf-profile.children.cycles-pp.mas_wr_node_store
0.15 +0.0 0.16 ± 2% perf-profile.children.cycles-pp.perf_event_mmap_event
0.38 +0.0 0.39 perf-profile.children.cycles-pp.arch_exit_to_user_mode_prepare
0.21 +0.0 0.22 perf-profile.children.cycles-pp.__x64_sys_fcntl
0.08 ± 5% +0.0 0.10 ± 4% perf-profile.children.cycles-pp.do_iter_readv_writev
0.10 +0.0 0.12 ± 4% perf-profile.children.cycles-pp.run_ksoftirqd
0.21 +0.0 0.23 ± 2% perf-profile.children.cycles-pp.kmem_cache_alloc_noprof
0.10 +0.0 0.12 ± 4% perf-profile.children.cycles-pp.smpboot_thread_fn
0.13 +0.0 0.15 ± 3% perf-profile.children.cycles-pp.handle_softirqs
0.12 ± 3% +0.0 0.14 ± 2% perf-profile.children.cycles-pp.rcu_core
0.12 +0.0 0.14 ± 3% perf-profile.children.cycles-pp.alloc_inode
0.12 +0.0 0.14 ± 3% perf-profile.children.cycles-pp.rcu_do_batch
0.67 +0.0 0.69 perf-profile.children.cycles-pp.entry_SYSCALL_64
0.46 +0.0 0.48 perf-profile.children.cycles-pp.do_vmi_munmap
0.44 +0.0 0.46 perf-profile.children.cycles-pp.do_vmi_align_munmap
0.48 +0.0 0.51 perf-profile.children.cycles-pp.entry_SYSRETQ_unsafe_stack
0.47 +0.0 0.50 perf-profile.children.cycles-pp.__vm_munmap
0.47 +0.0 0.50 perf-profile.children.cycles-pp.__x64_sys_munmap
0.05 +0.0 0.08 perf-profile.children.cycles-pp.inode_init_always_gfp
0.31 ± 4% +0.0 0.34 ± 4% perf-profile.children.cycles-pp.do_filp_open
0.31 ± 5% +0.0 0.34 ± 4% perf-profile.children.cycles-pp.path_openat
0.37 ± 4% +0.0 0.40 ± 3% perf-profile.children.cycles-pp.__x64_sys_openat
0.37 ± 4% +0.0 0.40 ± 3% perf-profile.children.cycles-pp.do_sys_openat2
0.85 +0.0 0.89 perf-profile.children.cycles-pp.llseek
2.40 +0.0 2.44 perf-profile.children.cycles-pp.mmap_region
2.59 +0.1 2.64 perf-profile.children.cycles-pp.ksys_mmap_pgoff
46.32 +0.8 47.16 perf-profile.children.cycles-pp.inode_sb_list_add
46.44 +0.9 47.30 perf-profile.children.cycles-pp.new_inode
46.54 +0.9 47.40 perf-profile.children.cycles-pp.__shmem_get_inode
46.73 +0.9 47.60 perf-profile.children.cycles-pp.__shmem_file_setup
47.37 +0.9 48.28 perf-profile.children.cycles-pp.__mmap_region
47.64 +0.9 48.56 perf-profile.children.cycles-pp.do_mmap
47.68 +0.9 48.60 perf-profile.children.cycles-pp.vm_mmap_pgoff
47.83 +0.9 48.76 perf-profile.children.cycles-pp.__mmap
0.00 +2.1 2.13 perf-profile.children.cycles-pp.shmem_zero_setup_desc
91.71 -0.4 91.31 perf-profile.self.cycles-pp.native_queued_spin_lock_slowpath
0.22 +0.0 0.23 perf-profile.self.cycles-pp.entry_SYSCALL_64
0.30 +0.0 0.31 perf-profile.self.cycles-pp.do_syscall_64
0.35 +0.0 0.36 perf-profile.self.cycles-pp.arch_exit_to_user_mode_prepare
0.47 +0.0 0.50 perf-profile.self.cycles-pp.entry_SYSRETQ_unsafe_stack
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
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