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X-MS-Exchange-CrossTenant-UserPrincipalName: 42lgSaEgMz/AudjCi5WXN9EJ+PMnFnAlDIU4UVkAEphanQFR29t8zstiSdnhcyayB+SwBZ8GDxSgagbcB7u/ww== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW5PR11MB5761 X-OriginatorOrg: intel.com Hello, normally we won't report performance results if we suspect it is caused by alignment problems. since this patch touches the code related with alignment: - struct work_struct reorder_work; - spinlock_t ____cacheline_aligned lock; we still make out below report FYI what's the possible performance impact. kernel test robot noticed a 3.1% regression of unixbench.throughput on: commit: 71203f68c7749609d7fc8ae6ad054bdedeb24f91 ("padata: Fix pd UAF once and for all") https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master [test failed on linux-next/master 1b152eeca84a02bdb648f16b82ef3394007a9dcf] testcase: unixbench config: x86_64-rhel-9.4 compiler: gcc-12 test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory parameters: runtime: 300s nr_task: 100% test: fsbuffer-w cpufreq_governor: performance In addition to that, the commit also has significant impact on the following tests: +------------------+--------------------------------------------------------------+ | testcase: change | will-it-scale: will-it-scale.per_thread_ops 1.1% improvement | | test machine | 104 threads 2 sockets (Skylake) with 192G memory | | test parameters | cpufreq_governor=performance | | | mode=thread | | | nr_task=100% | | | test=pwrite1 | +------------------+--------------------------------------------------------------+ If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Closes: https://lore.kernel.org/oe-lkp/202506261012.11b518e7-lkp@intel.com Details are as below: --------------------------------------------------------------------------------------------------> The kernel config and materials to reproduce are available at: https://download.01.org/0day-ci/archive/20250626/202506261012.11b518e7-lkp@intel.com ========================================================================================= compiler/cpufreq_governor/kconfig/nr_task/rootfs/runtime/tbox_group/test/testcase: gcc-12/performance/x86_64-rhel-9.4/100%/debian-12-x86_64-20240206.cgz/300s/lkp-icl-2sp9/fsbuffer-w/unixbench commit: 73c2437109 ("crypto: s390/sha3 - Use cpu byte-order when exporting") 71203f68c7 ("padata: Fix pd UAF once and for all") 73c2437109c3eab2 71203f68c7749609d7fc8ae6ad0 ---------------- --------------------------- %stddev %change %stddev \ | \ 111306 +2.0% 113530 proc-vmstat.pgreuse 0.01 ± 4% +14.9% 0.01 perf-sched.sch_delay.max.ms.schedule_hrtimeout_range_clock.ep_poll.do_epoll_wait.__x64_sys_epoll_wait 715.14 ±167% -99.4% 3.99 ± 80% perf-sched.total_sch_delay.max.ms 33278354 -3.1% 32249523 unixbench.throughput 1854 -4.8% 1765 unixbench.time.user_time 1.233e+10 -3.1% 1.195e+10 unixbench.workload 4.717e+10 -3.1% 4.573e+10 perf-stat.i.branch-instructions 0.42 -0.0 0.41 perf-stat.i.branch-miss-rate% 28489209 ± 2% -10.9% 25397034 perf-stat.i.branch-misses 0.97 +2.8% 1.00 perf-stat.i.cpi 1.946e+11 -3.1% 1.886e+11 perf-stat.i.instructions 1.05 -2.8% 1.02 perf-stat.i.ipc 0.06 ± 2% -0.0 0.06 perf-stat.overall.branch-miss-rate% 0.94 +3.2% 0.97 perf-stat.overall.cpi 1.06 -3.1% 1.03 perf-stat.overall.ipc 4.706e+10 -3.1% 4.562e+10 perf-stat.ps.branch-instructions 28421825 ± 2% -10.9% 25336865 perf-stat.ps.branch-misses 1.942e+11 -3.1% 1.882e+11 perf-stat.ps.instructions 7.212e+13 -3.1% 6.991e+13 perf-stat.total.instructions *************************************************************************************************** lkp-skl-fpga01: 104 threads 2 sockets (Skylake) with 192G memory ========================================================================================= compiler/cpufreq_governor/kconfig/mode/nr_task/rootfs/tbox_group/test/testcase: gcc-12/performance/x86_64-rhel-9.4/thread/100%/debian-12-x86_64-20240206.cgz/lkp-skl-fpga01/pwrite1/will-it-scale commit: 73c2437109 ("crypto: s390/sha3 - Use cpu byte-order when exporting") 71203f68c7 ("padata: Fix pd UAF once and for all") 73c2437109c3eab2 71203f68c7749609d7fc8ae6ad0 ---------------- --------------------------- %stddev %change %stddev \ | \ 997120 +1.5% 1011812 proc-vmstat.pgfree 55606929 +1.1% 56223715 will-it-scale.104.threads 534681 +1.1% 540612 will-it-scale.per_thread_ops 55606929 +1.1% 56223715 will-it-scale.workload 0.01 ± 34% +63.9% 0.02 ± 31% perf-sched.sch_delay.avg.ms.anon_pipe_read.fifo_pipe_read.vfs_read.ksys_read 233.78 ±143% +242.3% 800.28 perf-sched.wait_and_delay.avg.ms.__x64_sys_pause.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 74.68 ± 6% +18.5% 88.49 ± 7% perf-sched.wait_and_delay.avg.ms.anon_pipe_read.fifo_pipe_read.vfs_read.ksys_read 4.69 ± 44% -84.7% 0.72 ± 30% perf-sched.wait_and_delay.avg.ms.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 576.00 ± 9% -17.7% 473.83 ± 7% perf-sched.wait_and_delay.count.anon_pipe_read.fifo_pipe_read.vfs_read.ksys_read 999.68 -98.9% 11.47 ± 85% perf-sched.wait_and_delay.max.ms.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 234.63 ±142% +240.8% 799.73 perf-sched.wait_time.avg.ms.__x64_sys_pause.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 74.67 ± 6% +18.5% 88.46 ± 7% perf-sched.wait_time.avg.ms.anon_pipe_read.fifo_pipe_read.vfs_read.ksys_read 4.31 ± 48% -91.6% 0.36 ± 29% perf-sched.wait_time.avg.ms.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 999.37 -99.3% 6.65 ± 67% perf-sched.wait_time.max.ms.exit_to_user_mode_loop.do_syscall_64.entry_SYSCALL_64_after_hwframe.[unknown] 1.686e+10 +1.1% 1.704e+10 perf-stat.i.branch-instructions 1.62 +0.0 1.67 perf-stat.i.branch-miss-rate% 2.726e+08 +4.1% 2.836e+08 perf-stat.i.branch-misses 3.36 -1.0% 3.32 perf-stat.i.cpi 8.562e+10 +1.1% 8.656e+10 perf-stat.i.instructions 1.62 +0.0 1.66 perf-stat.overall.branch-miss-rate% 3.36 -1.0% 3.33 perf-stat.overall.cpi 1.68e+10 +1.1% 1.698e+10 perf-stat.ps.branch-instructions 2.717e+08 +4.1% 2.827e+08 perf-stat.ps.branch-misses 8.533e+10 +1.1% 8.627e+10 perf-stat.ps.instructions 2.578e+13 +1.1% 2.607e+13 perf-stat.total.instructions 4.44 ± 3% -0.9 3.51 ± 5% perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_safe_stack.__libc_pwrite 11.68 -0.3 11.41 perf-profile.calltrace.cycles-pp.copy_folio_from_iter_atomic.generic_perform_write.shmem_file_write_iter.vfs_write.__x64_sys_pwrite64 0.85 ± 8% -0.2 0.70 ± 3% perf-profile.calltrace.cycles-pp.file_remove_privs_flags.shmem_file_write_iter.vfs_write.__x64_sys_pwrite64.do_syscall_64 0.81 ± 3% -0.1 0.67 perf-profile.calltrace.cycles-pp.balance_dirty_pages_ratelimited_flags.generic_perform_write.shmem_file_write_iter.vfs_write.__x64_sys_pwrite64 2.26 -0.1 2.13 perf-profile.calltrace.cycles-pp.fdget.__x64_sys_pwrite64.do_syscall_64.entry_SYSCALL_64_after_hwframe.__libc_pwrite 0.94 -0.0 0.90 ± 2% perf-profile.calltrace.cycles-pp.noop_dirty_folio.shmem_write_end.generic_perform_write.shmem_file_write_iter.vfs_write 1.14 +0.1 1.19 ± 2% perf-profile.calltrace.cycles-pp.folio_mark_dirty.shmem_write_end.generic_perform_write.shmem_file_write_iter.vfs_write 2.18 ± 2% +0.4 2.58 ± 10% perf-profile.calltrace.cycles-pp.filemap_get_entry.shmem_get_folio_gfp.shmem_write_begin.generic_perform_write.shmem_file_write_iter 2.58 ± 3% -0.5 2.07 ± 4% perf-profile.children.cycles-pp.entry_SYSCALL_64_safe_stack 7.87 -0.5 7.38 perf-profile.children.cycles-pp.entry_SYSCALL_64 11.90 -0.3 11.62 perf-profile.children.cycles-pp.copy_folio_from_iter_atomic 9.13 -0.3 8.87 perf-profile.children.cycles-pp.rep_movs_alternative 0.87 ± 8% -0.1 0.72 ± 3% perf-profile.children.cycles-pp.file_remove_privs_flags 0.84 ± 3% -0.1 0.71 perf-profile.children.cycles-pp.balance_dirty_pages_ratelimited_flags 2.26 -0.1 2.13 perf-profile.children.cycles-pp.fdget 1.01 -0.0 0.96 perf-profile.children.cycles-pp.noop_dirty_folio 0.43 ± 2% -0.0 0.39 ± 3% perf-profile.children.cycles-pp.rcu_all_qs 0.29 ± 3% -0.0 0.26 perf-profile.children.cycles-pp.inode_to_bdi 0.30 -0.0 0.27 perf-profile.children.cycles-pp.x64_sys_call 0.35 ± 2% -0.0 0.32 perf-profile.children.cycles-pp.rw_verify_area 0.39 ± 3% +0.2 0.58 ± 24% perf-profile.children.cycles-pp.xas_load 2.20 ± 2% +0.4 2.61 ± 10% perf-profile.children.cycles-pp.filemap_get_entry 6.97 -0.5 6.48 perf-profile.self.cycles-pp.entry_SYSCALL_64 2.14 ± 3% -0.4 1.71 ± 2% perf-profile.self.cycles-pp.shmem_get_folio_gfp 2.60 -0.3 2.28 ± 4% perf-profile.self.cycles-pp.do_syscall_64 8.90 -0.2 8.65 perf-profile.self.cycles-pp.rep_movs_alternative 2.28 -0.2 2.10 perf-profile.self.cycles-pp.shmem_write_end 0.86 ± 8% -0.1 0.71 ± 3% perf-profile.self.cycles-pp.file_remove_privs_flags 2.24 -0.1 2.11 perf-profile.self.cycles-pp.fdget 0.58 ± 4% -0.1 0.48 perf-profile.self.cycles-pp.balance_dirty_pages_ratelimited_flags 0.70 ± 3% -0.1 0.62 ± 3% perf-profile.self.cycles-pp.entry_SYSCALL_64_safe_stack 0.61 ± 2% -0.1 0.55 perf-profile.self.cycles-pp.generic_write_checks 0.34 ± 2% -0.0 0.31 ± 3% perf-profile.self.cycles-pp.rcu_all_qs 0.28 -0.0 0.25 perf-profile.self.cycles-pp.x64_sys_call 0.25 ± 4% -0.0 0.22 perf-profile.self.cycles-pp.inode_to_bdi 0.24 ± 3% -0.0 0.21 perf-profile.self.cycles-pp.rw_verify_area 0.77 ± 2% +0.0 0.82 ± 2% perf-profile.self.cycles-pp.folio_mark_dirty 0.72 +0.1 0.78 ± 2% perf-profile.self.cycles-pp.current_time 0.20 ± 3% +0.2 0.39 ± 31% perf-profile.self.cycles-pp.xas_load 1.80 ± 2% +0.2 2.02 ± 6% perf-profile.self.cycles-pp.filemap_get_entry 9.38 +0.2 9.61 perf-profile.self.cycles-pp.entry_SYSCALL_64_after_hwframe 2.18 ± 2% +0.3 2.50 ± 5% perf-profile.self.cycles-pp.shmem_write_begin 2.54 +0.8 3.37 ± 4% perf-profile.self.cycles-pp.__libc_pwrite 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