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Message-ID: <202407241609.9b33c747-oliver.sang@intel.com>
Date: Wed, 24 Jul 2024 16:35:33 +0800
From: kernel test robot <oliver.sang@...el.com>
To: Jiri Olsa <jolsa@...nel.org>
CC: <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, <linux-kernel@...r.kernel.org>,
Masami Hiramatsu <mhiramat@...nel.org>, Andrii Nakryiko <andrii@...nel.org>,
Oleg Nesterov <oleg@...hat.com>, <linux-trace-kernel@...r.kernel.org>,
<ying.huang@...el.com>, <feng.tang@...el.com>, <fengwei.yin@...el.com>,
<oliver.sang@...el.com>
Subject: [linus:master] [uprobe] ff474a78ce: stress-ng.mprotect.ops_per_sec
-12.3% regression
hi, Jiri Olsa, and all,
we made some investigation for this regression and confirmed the code change
in ff474a78ce is irrelevant to stress-ng performance regression, instead, it's
a code alignment issue.
if we applied below patch for both this commit and parent, the regression will
disappear.
diff --git a/Kbuild b/Kbuild
index 464b34a08f51e..d33d30b772324 100644
--- a/Kbuild
+++ b/Kbuild
@@ -78,11 +78,11 @@ prepare: $(offsets-file) missing-syscalls $(atomic-checks)
obj-y += init/
obj-y += usr/
+obj-y += mm/
obj-y += arch/$(SRCARCH)/
obj-y += $(ARCH_CORE)
obj-y += kernel/
obj-y += certs/
-obj-y += mm/
obj-y += fs/
obj-y += ipc/
obj-y += security/
we still make out below formal report FYI. and Feng Tang (Cced) is working on a
patch to mitigate this kind of less meaningful performance changes due to code
alignment.
Hello,
kernel test robot noticed a -12.3% regression of stress-ng.mprotect.ops_per_sec on:
commit: ff474a78cef5cb5f32be52fe25b78441327a2e7c ("uprobe: Add uretprobe syscall to speed up return probe")
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git master
testcase: stress-ng
test machine: 64 threads 2 sockets Intel(R) Xeon(R) Gold 6346 CPU @ 3.10GHz (Ice Lake) with 256G memory
parameters:
nr_threads: 100%
testtime: 60s
test: mprotect
cpufreq_governor: performance
Details are as below:
-------------------------------------------------------------------------------------------------->
The kernel config and materials to reproduce are available at:
https://download.01.org/0day-ci/archive/20240724/202407241609.9b33c747-oliver.sang@intel.com
=========================================================================================
compiler/cpufreq_governor/kconfig/nr_threads/rootfs/tbox_group/test/testcase/testtime:
gcc-13/performance/x86_64-rhel-8.3/100%/debian-12-x86_64-20240206.cgz/lkp-icl-2sp7/mprotect/stress-ng/60s
commit:
190fec72df ("uprobe: Wire up uretprobe system call")
ff474a78ce ("uprobe: Add uretprobe syscall to speed up return probe")
190fec72df4a5d4d ff474a78cef5cb5f32be52fe25b
---------------- ---------------------------
%stddev %change %stddev
\ | \
4.74 ± 3% -0.7 4.05 ± 9% mpstat.cpu.all.soft%
3424654 ± 2% -25.4% 2555508 ± 3% numa-numastat.node1.local_node
3457847 ± 2% -25.2% 2588010 ± 3% numa-numastat.node1.numa_hit
3460293 ± 2% -25.2% 2589125 ± 3% numa-vmstat.node1.numa_hit
3427101 ± 2% -25.4% 2556623 ± 3% numa-vmstat.node1.numa_local
5.214e+08 -12.3% 4.573e+08 stress-ng.mprotect.ops
8682811 -12.3% 7614767 stress-ng.mprotect.ops_per_sec
3343 +1.4% 3392 stress-ng.time.system_time
266.56 -9.7% 240.62 stress-ng.time.user_time
64550 ± 2% -4.1% 61895 ± 2% proc-vmstat.nr_slab_unreclaimable
6835207 ± 2% -15.4% 5779808 proc-vmstat.numa_hit
6768863 ± 2% -15.6% 5713472 proc-vmstat.numa_local
13293019 ± 2% -15.5% 11227409 proc-vmstat.pgalloc_normal
13067274 ± 2% -15.8% 11002545 proc-vmstat.pgfree
2e+10 ± 3% -12.2% 1.756e+10 ± 6% perf-stat.i.branch-instructions
2.1e+08 ± 3% -11.6% 1.856e+08 ± 5% perf-stat.i.branch-misses
35961320 ± 2% -14.1% 30897555 ± 6% perf-stat.i.cache-misses
1.43e+08 ± 2% -12.1% 1.257e+08 ± 5% perf-stat.i.cache-references
2.00 +12.4% 2.25 ± 2% perf-stat.i.cpi
9.396e+10 ± 3% -12.1% 8.262e+10 ± 6% perf-stat.i.instructions
0.50 -10.4% 0.45 ± 4% perf-stat.i.ipc
65.08 ± 3% -12.6% 56.86 ± 6% perf-stat.i.metric.K/sec
4163362 ± 3% -12.6% 3638357 ± 6% perf-stat.i.page-faults
2.02 +13.2% 2.29 perf-stat.overall.cpi
5301 ± 4% +16.1% 6156 ± 7% perf-stat.overall.cycles-between-cache-misses
0.49 -11.7% 0.44 perf-stat.overall.ipc
1.972e+10 ± 3% -12.2% 1.731e+10 ± 5% perf-stat.ps.branch-instructions
2.071e+08 ± 3% -11.6% 1.831e+08 ± 4% perf-stat.ps.branch-misses
35342279 ± 2% -14.1% 30342927 ± 5% perf-stat.ps.cache-misses
1.412e+08 ± 2% -12.0% 1.243e+08 ± 5% perf-stat.ps.cache-references
9.262e+10 ± 3% -12.1% 8.143e+10 ± 5% perf-stat.ps.instructions
4109544 ± 3% -12.6% 3592376 ± 6% perf-stat.ps.page-faults
5.823e+12 -11.1% 5.178e+12 perf-stat.total.instructions
59.24 -3.1 56.14 perf-profile.calltrace.cycles-pp.__mprotect
51.61 -2.3 49.27 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.__mprotect
51.20 -2.3 48.90 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mprotect
49.61 -2.1 47.49 perf-profile.calltrace.cycles-pp.__x64_sys_mprotect.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mprotect
49.36 -2.1 47.27 perf-profile.calltrace.cycles-pp.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64.entry_SYSCALL_64_after_hwframe.__mprotect
34.18 -1.9 32.28 perf-profile.calltrace.cycles-pp.mprotect_fixup.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64.entry_SYSCALL_64_after_hwframe
24.64 -1.3 23.38 perf-profile.calltrace.cycles-pp.vma_modify.mprotect_fixup.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64
7.35 -0.6 6.70 ± 3% perf-profile.calltrace.cycles-pp.perf_event_mmap.mprotect_fixup.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64
11.07 -0.6 10.44 perf-profile.calltrace.cycles-pp.__split_vma.vma_modify.mprotect_fixup.do_mprotect_pkey.__x64_sys_mprotect
13.35 -0.6 12.73 perf-profile.calltrace.cycles-pp.vma_merge.vma_modify.mprotect_fixup.do_mprotect_pkey.__x64_sys_mprotect
6.97 -0.6 6.36 ± 3% perf-profile.calltrace.cycles-pp.perf_event_mmap_event.perf_event_mmap.mprotect_fixup.do_mprotect_pkey.__x64_sys_mprotect
1.14 ± 17% -0.5 0.62 ± 4% perf-profile.calltrace.cycles-pp.rwsem_spin_on_owner.rwsem_optimistic_spin.rwsem_down_write_slowpath.down_write.vma_prepare
3.38 -0.4 3.01 perf-profile.calltrace.cycles-pp.asm_exc_page_fault.__mprotect
3.16 -0.3 2.84 perf-profile.calltrace.cycles-pp.vma_complete.__split_vma.vma_modify.mprotect_fixup.do_mprotect_pkey
2.44 -0.3 2.14 perf-profile.calltrace.cycles-pp.handle_signal.arch_do_signal_or_restart.irqentry_exit_to_user_mode.asm_exc_page_fault.stress_mprotect_mem
2.60 -0.3 2.30 perf-profile.calltrace.cycles-pp.clear_bhb_loop.__mprotect
3.00 -0.3 2.73 perf-profile.calltrace.cycles-pp.stress_sig_handler
1.93 -0.3 1.68 perf-profile.calltrace.cycles-pp.mas_store_prealloc.vma_complete.__split_vma.vma_modify.mprotect_fixup
2.79 -0.2 2.55 ± 3% perf-profile.calltrace.cycles-pp.vma_prepare.vma_merge.vma_modify.mprotect_fixup.do_mprotect_pkey
1.79 -0.2 1.56 perf-profile.calltrace.cycles-pp.x64_setup_rt_frame.handle_signal.arch_do_signal_or_restart.irqentry_exit_to_user_mode.asm_exc_page_fault
2.10 -0.2 1.88 perf-profile.calltrace.cycles-pp.mas_store_prealloc.vma_merge.vma_modify.mprotect_fixup.do_mprotect_pkey
1.73 -0.2 1.51 perf-profile.calltrace.cycles-pp.mas_wr_store_entry.mas_store_prealloc.vma_complete.__split_vma.vma_modify
1.95 -0.2 1.73 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64.__mprotect
1.92 -0.2 1.70 perf-profile.calltrace.cycles-pp.mas_wr_store_entry.mas_store_prealloc.vma_merge.vma_modify.mprotect_fixup
2.20 ± 2% -0.2 2.01 ± 4% perf-profile.calltrace.cycles-pp.down_write.vma_prepare.vma_merge.vma_modify.mprotect_fixup
1.35 -0.2 1.15 perf-profile.calltrace.cycles-pp.security_file_mprotect.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64.entry_SYSCALL_64_after_hwframe
1.50 -0.2 1.31 perf-profile.calltrace.cycles-pp.get_sigframe.x64_setup_rt_frame.handle_signal.arch_do_signal_or_restart.irqentry_exit_to_user_mode
2.76 -0.2 2.58 ± 3% perf-profile.calltrace.cycles-pp.vma_prepare.__split_vma.vma_modify.mprotect_fixup.do_mprotect_pkey
1.42 -0.2 1.24 ± 2% perf-profile.calltrace.cycles-pp.mas_wr_node_store.mas_wr_store_entry.mas_store_prealloc.vma_complete.__split_vma
1.77 -0.2 1.60 perf-profile.calltrace.cycles-pp.kmem_cache_alloc_noprof.vm_area_dup.__split_vma.vma_modify.mprotect_fixup
0.60 ± 3% -0.2 0.45 ± 44% perf-profile.calltrace.cycles-pp.__perf_event_header__init_id.perf_event_mmap_output.perf_iterate_sb.perf_event_mmap_event.perf_event_mmap
1.28 -0.1 1.14 perf-profile.calltrace.cycles-pp.can_modify_mm.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64.entry_SYSCALL_64_after_hwframe
1.43 -0.1 1.28 ± 2% perf-profile.calltrace.cycles-pp.mas_wr_node_store.mas_wr_store_entry.mas_store_prealloc.vma_merge.vma_modify
1.35 ± 2% -0.1 1.21 ± 5% perf-profile.calltrace.cycles-pp.rwsem_down_write_slowpath.down_write.vma_prepare.vma_merge.vma_modify
0.75 -0.1 0.61 perf-profile.calltrace.cycles-pp.apparmor_file_mprotect.security_file_mprotect.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64
0.79 ± 2% -0.1 0.66 ± 3% perf-profile.calltrace.cycles-pp.vma_interval_tree_insert.vma_complete.vma_merge.vma_modify.mprotect_fixup
1.97 -0.1 1.84 perf-profile.calltrace.cycles-pp.vm_area_dup.__split_vma.vma_modify.mprotect_fixup.do_mprotect_pkey
1.22 ± 2% -0.1 1.09 ± 5% perf-profile.calltrace.cycles-pp.rwsem_optimistic_spin.rwsem_down_write_slowpath.down_write.vma_prepare.vma_merge
3.42 -0.1 3.30 ± 2% perf-profile.calltrace.cycles-pp.vma_complete.vma_merge.vma_modify.mprotect_fixup.do_mprotect_pkey
0.94 -0.1 0.82 perf-profile.calltrace.cycles-pp.stress_mwc16modn
0.86 -0.1 0.75 perf-profile.calltrace.cycles-pp.sync_regs.asm_exc_page_fault.stress_mprotect_mem
0.81 -0.1 0.71 perf-profile.calltrace.cycles-pp.copy_fpstate_to_sigframe.get_sigframe.x64_setup_rt_frame.handle_signal.arch_do_signal_or_restart
0.89 -0.1 0.80 perf-profile.calltrace.cycles-pp.stress_mwc32modn
0.95 ± 2% -0.1 0.86 ± 5% perf-profile.calltrace.cycles-pp.rwsem_down_write_slowpath.down_write.vma_prepare.__split_vma.vma_modify
0.92 -0.1 0.84 perf-profile.calltrace.cycles-pp.__memcg_slab_post_alloc_hook.kmem_cache_alloc_noprof.vm_area_dup.__split_vma.vma_modify
0.86 ± 2% -0.1 0.77 ± 5% perf-profile.calltrace.cycles-pp.rwsem_optimistic_spin.rwsem_down_write_slowpath.down_write.vma_prepare.__split_vma
0.70 -0.1 0.62 perf-profile.calltrace.cycles-pp.mas_find.can_modify_mm.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64
1.46 -0.1 1.38 ± 4% perf-profile.calltrace.cycles-pp.down_write.vma_prepare.__split_vma.vma_modify.mprotect_fixup
0.62 -0.1 0.55 ± 2% perf-profile.calltrace.cycles-pp.simple_dname.perf_event_mmap_event.perf_event_mmap.mprotect_fixup.do_mprotect_pkey
2.29 -0.1 2.22 perf-profile.calltrace.cycles-pp.mas_find.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64.entry_SYSCALL_64_after_hwframe
0.58 -0.1 0.52 perf-profile.calltrace.cycles-pp.__rseq_handle_notify_resume.handle_signal.arch_do_signal_or_restart.irqentry_exit_to_user_mode.asm_exc_page_fault
0.65 -0.1 0.59 perf-profile.calltrace.cycles-pp.handle_signal.arch_do_signal_or_restart.irqentry_exit_to_user_mode.asm_exc_page_fault.stress_sig_handler
1.80 -0.0 1.75 perf-profile.calltrace.cycles-pp.pthread_sigmask
0.75 ± 3% -0.0 0.70 ± 3% perf-profile.calltrace.cycles-pp.handle_softirqs.irq_exit_rcu.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt.force_sig_info_to_task
0.75 ± 3% -0.0 0.70 ± 3% perf-profile.calltrace.cycles-pp.irq_exit_rcu.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt.force_sig_info_to_task.force_sig_fault
0.80 ± 2% -0.0 0.76 ± 2% perf-profile.calltrace.cycles-pp.asm_sysvec_apic_timer_interrupt.force_sig_info_to_task.force_sig_fault.__bad_area_nosemaphore.bad_area_access_error
0.80 ± 3% -0.0 0.75 ± 2% perf-profile.calltrace.cycles-pp.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt.force_sig_info_to_task.force_sig_fault.__bad_area_nosemaphore
1.35 -0.0 1.31 perf-profile.calltrace.cycles-pp.mas_walk.mas_find.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64
1.23 -0.0 1.19 perf-profile.calltrace.cycles-pp.asm_exc_page_fault.stress_sig_handler
1.22 -0.0 1.18 perf-profile.calltrace.cycles-pp.irqentry_exit_to_user_mode.asm_exc_page_fault.stress_sig_handler
1.16 -0.0 1.12 perf-profile.calltrace.cycles-pp.arch_do_signal_or_restart.irqentry_exit_to_user_mode.asm_exc_page_fault.stress_sig_handler
0.66 -0.0 0.62 perf-profile.calltrace.cycles-pp.lock_vma_under_rcu.do_user_addr_fault.exc_page_fault.asm_exc_page_fault.stress_mprotect_mem
0.64 +0.0 0.66 perf-profile.calltrace.cycles-pp.mas_next_slot.mas_find.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64
1.08 +0.0 1.11 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.pthread_sigmask
0.62 ± 2% +0.0 0.65 ± 2% perf-profile.calltrace.cycles-pp.irq_exit_rcu.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt.get_signal.arch_do_signal_or_restart
0.62 +0.0 0.65 ± 2% perf-profile.calltrace.cycles-pp.handle_softirqs.irq_exit_rcu.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt.get_signal
1.04 +0.0 1.08 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.pthread_sigmask
0.66 +0.0 0.70 ± 2% perf-profile.calltrace.cycles-pp.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt.get_signal.arch_do_signal_or_restart.irqentry_exit_to_user_mode
0.67 +0.0 0.71 perf-profile.calltrace.cycles-pp.asm_sysvec_apic_timer_interrupt.get_signal.arch_do_signal_or_restart.irqentry_exit_to_user_mode.asm_exc_page_fault
0.52 +0.0 0.56 perf-profile.calltrace.cycles-pp.__bad_area.bad_area_access_error.exc_page_fault.asm_exc_page_fault.stress_mprotect_mem
0.86 +0.1 0.91 perf-profile.calltrace.cycles-pp.__x64_sys_rt_sigprocmask.do_syscall_64.entry_SYSCALL_64_after_hwframe.pthread_sigmask
0.82 +0.1 0.88 perf-profile.calltrace.cycles-pp.tlb_gather_mmu.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64.entry_SYSCALL_64_after_hwframe
0.87 ± 4% +0.1 0.94 ± 2% perf-profile.calltrace.cycles-pp.perf_output_begin.perf_event_mmap_output.perf_iterate_sb.perf_event_mmap_event.perf_event_mmap
0.59 +0.1 0.67 perf-profile.calltrace.cycles-pp.sigprocmask.__x64_sys_rt_sigprocmask.do_syscall_64.entry_SYSCALL_64_after_hwframe.pthread_sigmask
0.85 +0.1 0.93 perf-profile.calltrace.cycles-pp.tlb_finish_mmu.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64.entry_SYSCALL_64_after_hwframe
0.43 ± 44% +0.1 0.53 perf-profile.calltrace.cycles-pp.mas_alloc_nodes.mas_preallocate.__split_vma.vma_modify.mprotect_fixup
1.82 +0.1 1.92 perf-profile.calltrace.cycles-pp.down_write_killable.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64.entry_SYSCALL_64_after_hwframe
0.91 +0.1 1.03 perf-profile.calltrace.cycles-pp.mas_preallocate.__split_vma.vma_modify.mprotect_fixup.do_mprotect_pkey
2.20 +0.3 2.55 perf-profile.calltrace.cycles-pp.up_write.do_mprotect_pkey.__x64_sys_mprotect.do_syscall_64.entry_SYSCALL_64_after_hwframe
0.00 +0.5 0.52 ± 2% perf-profile.calltrace.cycles-pp.up_read.__bad_area.bad_area_access_error.exc_page_fault.asm_exc_page_fault
14.37 +1.5 15.84 perf-profile.calltrace.cycles-pp.force_sig_info_to_task.force_sig_fault.__bad_area_nosemaphore.bad_area_access_error.exc_page_fault
14.50 +1.5 15.98 perf-profile.calltrace.cycles-pp.force_sig_fault.__bad_area_nosemaphore.bad_area_access_error.exc_page_fault.asm_exc_page_fault
12.56 +1.5 14.04 perf-profile.calltrace.cycles-pp.__sigqueue_alloc.__send_signal_locked.force_sig_info_to_task.force_sig_fault.__bad_area_nosemaphore
14.70 +1.5 16.20 perf-profile.calltrace.cycles-pp.__bad_area_nosemaphore.bad_area_access_error.exc_page_fault.asm_exc_page_fault.stress_mprotect_mem
13.11 +1.5 14.62 perf-profile.calltrace.cycles-pp.__send_signal_locked.force_sig_info_to_task.force_sig_fault.__bad_area_nosemaphore.bad_area_access_error
16.61 +1.5 18.12 perf-profile.calltrace.cycles-pp.exc_page_fault.asm_exc_page_fault.stress_mprotect_mem
12.16 +1.5 13.67 perf-profile.calltrace.cycles-pp.inc_rlimit_get_ucounts.__sigqueue_alloc.__send_signal_locked.force_sig_info_to_task.force_sig_fault
15.30 +1.5 16.82 perf-profile.calltrace.cycles-pp.bad_area_access_error.exc_page_fault.asm_exc_page_fault.stress_mprotect_mem
14.79 +2.4 17.15 perf-profile.calltrace.cycles-pp.irqentry_exit_to_user_mode.asm_exc_page_fault.stress_mprotect_mem
14.74 +2.4 17.10 perf-profile.calltrace.cycles-pp.arch_do_signal_or_restart.irqentry_exit_to_user_mode.asm_exc_page_fault.stress_mprotect_mem
10.32 +2.7 12.98 perf-profile.calltrace.cycles-pp.do_dec_rlimit_put_ucounts.get_signal.arch_do_signal_or_restart.irqentry_exit_to_user_mode.asm_exc_page_fault
12.16 +2.7 14.84 perf-profile.calltrace.cycles-pp.get_signal.arch_do_signal_or_restart.irqentry_exit_to_user_mode.asm_exc_page_fault.stress_mprotect_mem
34.36 +3.5 37.86 perf-profile.calltrace.cycles-pp.stress_mprotect_mem
32.29 +3.8 36.05 perf-profile.calltrace.cycles-pp.asm_exc_page_fault.stress_mprotect_mem
59.32 -3.1 56.23 perf-profile.children.cycles-pp.__mprotect
52.91 -2.3 50.60 perf-profile.children.cycles-pp.entry_SYSCALL_64_after_hwframe
52.48 -2.3 50.22 perf-profile.children.cycles-pp.do_syscall_64
49.68 -2.1 47.55 perf-profile.children.cycles-pp.__x64_sys_mprotect
49.58 -2.1 47.46 perf-profile.children.cycles-pp.do_mprotect_pkey
34.28 -1.9 32.37 perf-profile.children.cycles-pp.mprotect_fixup
24.66 -1.3 23.40 perf-profile.children.cycles-pp.vma_modify
5.34 -0.7 4.66 perf-profile.children.cycles-pp.sysvec_apic_timer_interrupt
5.37 -0.7 4.71 perf-profile.children.cycles-pp.asm_sysvec_apic_timer_interrupt
7.37 -0.7 6.71 ± 3% perf-profile.children.cycles-pp.perf_event_mmap
5.05 -0.6 4.41 ± 2% perf-profile.children.cycles-pp.handle_softirqs
5.04 -0.6 4.39 ± 2% perf-profile.children.cycles-pp.rcu_core
4.95 -0.6 4.31 perf-profile.children.cycles-pp.irq_exit_rcu
5.01 -0.6 4.37 ± 2% perf-profile.children.cycles-pp.rcu_do_batch
11.11 -0.6 10.48 perf-profile.children.cycles-pp.__split_vma
13.43 -0.6 12.82 perf-profile.children.cycles-pp.vma_merge
7.02 -0.6 6.42 ± 3% perf-profile.children.cycles-pp.perf_event_mmap_event
4.58 -0.6 4.03 ± 2% perf-profile.children.cycles-pp.kmem_cache_free
4.07 -0.5 3.60 perf-profile.children.cycles-pp.mas_store_prealloc
6.63 -0.5 6.18 perf-profile.children.cycles-pp.vma_complete
3.71 -0.4 3.26 perf-profile.children.cycles-pp.mas_wr_store_entry
3.20 -0.4 2.77 ± 3% perf-profile.children.cycles-pp.__slab_free
5.57 -0.4 5.16 ± 3% perf-profile.children.cycles-pp.vma_prepare
3.10 -0.4 2.74 perf-profile.children.cycles-pp.handle_signal
2.97 -0.3 2.63 perf-profile.children.cycles-pp.clear_bhb_loop
2.92 -0.3 2.59 ± 2% perf-profile.children.cycles-pp.mas_wr_node_store
3.00 -0.3 2.73 perf-profile.children.cycles-pp.kmem_cache_alloc_noprof
5.08 -0.3 4.82 ± 3% perf-profile.children.cycles-pp.down_write
1.81 ± 2% -0.2 1.57 ± 2% perf-profile.children.cycles-pp.vma_interval_tree_insert
2.31 ± 2% -0.2 2.08 ± 5% perf-profile.children.cycles-pp.rwsem_down_write_slowpath
1.82 -0.2 1.59 perf-profile.children.cycles-pp.x64_setup_rt_frame
2.09 ± 2% -0.2 1.89 ± 5% perf-profile.children.cycles-pp.rwsem_optimistic_spin
1.38 -0.2 1.18 perf-profile.children.cycles-pp.security_file_mprotect
1.52 -0.2 1.32 perf-profile.children.cycles-pp.get_sigframe
2.32 -0.2 2.14 perf-profile.children.cycles-pp.stress_sig_handler
1.42 -0.2 1.24 perf-profile.children.cycles-pp.vm_area_free_rcu_cb
1.48 -0.2 1.32 perf-profile.children.cycles-pp.entry_SYSCALL_64
1.23 ± 2% -0.2 1.06 ± 4% perf-profile.children.cycles-pp.rwsem_spin_on_owner
3.17 -0.2 3.01 perf-profile.children.cycles-pp.mas_find
1.31 -0.1 1.16 perf-profile.children.cycles-pp.can_modify_mm
0.77 -0.1 0.63 perf-profile.children.cycles-pp.apparmor_file_mprotect
1.11 -0.1 0.97 perf-profile.children.cycles-pp.entry_SYSRETQ_unsafe_stack
1.98 -0.1 1.84 perf-profile.children.cycles-pp.vm_area_dup
1.18 -0.1 1.06 ± 2% perf-profile.children.cycles-pp.vma_interval_tree_remove
0.97 -0.1 0.85 perf-profile.children.cycles-pp.stress_mwc16modn
2.09 -0.1 1.96 perf-profile.children.cycles-pp.mas_walk
1.30 -0.1 1.18 perf-profile.children.cycles-pp.__memcg_slab_post_alloc_hook
0.89 -0.1 0.78 perf-profile.children.cycles-pp.sync_regs
0.83 -0.1 0.73 perf-profile.children.cycles-pp.copy_fpstate_to_sigframe
0.94 -0.1 0.84 perf-profile.children.cycles-pp.stress_mwc32modn
0.73 -0.1 0.64 perf-profile.children.cycles-pp.native_irq_return_iret
0.78 -0.1 0.69 perf-profile.children.cycles-pp.__memcg_slab_free_hook
0.45 -0.1 0.37 ± 3% perf-profile.children.cycles-pp.rcu_cblist_dequeue
0.65 ± 3% -0.1 0.57 ± 3% perf-profile.children.cycles-pp.__perf_event_header__init_id
0.65 -0.1 0.57 ± 2% perf-profile.children.cycles-pp.simple_dname
0.57 -0.1 0.49 ± 2% perf-profile.children.cycles-pp.save_xstate_epilog
0.72 -0.1 0.65 perf-profile.children.cycles-pp.syscall_exit_to_user_mode
1.92 -0.1 1.85 perf-profile.children.cycles-pp.pthread_sigmask
0.62 -0.1 0.55 perf-profile.children.cycles-pp.mod_objcg_state
0.60 -0.1 0.54 perf-profile.children.cycles-pp.__rseq_handle_notify_resume
0.65 ± 2% -0.1 0.59 perf-profile.children.cycles-pp.mt_find
0.82 -0.1 0.76 perf-profile.children.cycles-pp.___slab_alloc
0.72 ± 4% -0.1 0.66 ± 2% perf-profile.children.cycles-pp.__cond_resched
0.37 -0.0 0.32 ± 2% perf-profile.children.cycles-pp.__rb_insert_augmented
0.43 ± 2% -0.0 0.38 ± 2% perf-profile.children.cycles-pp.obj_cgroup_charge
0.50 -0.0 0.45 ± 2% perf-profile.children.cycles-pp.prepend_copy
0.46 -0.0 0.42 perf-profile.children.cycles-pp.ima_file_mprotect
0.23 ± 4% -0.0 0.19 ± 13% perf-profile.children.cycles-pp.__memcpy
0.57 -0.0 0.52 perf-profile.children.cycles-pp.fpu__clear_user_states
0.44 -0.0 0.40 ± 2% perf-profile.children.cycles-pp.mtree_load
0.39 -0.0 0.35 perf-profile.children.cycles-pp.rseq_ip_fixup
0.43 -0.0 0.39 ± 2% perf-profile.children.cycles-pp.copy_from_kernel_nofault
0.42 -0.0 0.39 ± 2% perf-profile.children.cycles-pp.syscall_return_via_sysret
0.37 -0.0 0.33 ± 2% perf-profile.children.cycles-pp.vma_set_page_prot
0.39 -0.0 0.35 ± 2% perf-profile.children.cycles-pp.kfree
0.27 ± 4% -0.0 0.24 ± 4% perf-profile.children.cycles-pp.local_clock
0.26 -0.0 0.22 ± 2% perf-profile.children.cycles-pp.mas_wr_end_piv
0.28 -0.0 0.25 perf-profile.children.cycles-pp.syscall_exit_to_user_mode_prepare
0.20 ± 2% -0.0 0.16 ± 4% perf-profile.children.cycles-pp.strlen
0.23 ± 2% -0.0 0.20 ± 4% perf-profile.children.cycles-pp.mas_update_gap
0.50 -0.0 0.47 perf-profile.children.cycles-pp.kmalloc_trace_noprof
0.18 ± 3% -0.0 0.15 perf-profile.children.cycles-pp.vm_get_page_prot
0.37 ± 2% -0.0 0.34 perf-profile.children.cycles-pp.vma_wants_writenotify
0.25 ± 4% -0.0 0.22 ± 2% perf-profile.children.cycles-pp.local_clock_noinstr
0.23 ± 3% -0.0 0.20 ± 5% perf-profile.children.cycles-pp._copy_from_user
0.22 ± 2% -0.0 0.19 ± 2% perf-profile.children.cycles-pp.__put_user_nocheck_4
0.22 ± 3% -0.0 0.19 ± 2% perf-profile.children.cycles-pp.native_sched_clock
0.30 ± 5% -0.0 0.28 ± 2% perf-profile.children.cycles-pp.rcu_all_qs
0.10 ± 3% -0.0 0.07 ± 5% perf-profile.children.cycles-pp.aa_file_perm
0.29 ± 2% -0.0 0.27 perf-profile.children.cycles-pp.mas_pop_node
0.15 ± 3% -0.0 0.13 ± 3% perf-profile.children.cycles-pp.mas_leaf_max_gap
0.14 ± 3% -0.0 0.11 ± 4% perf-profile.children.cycles-pp.copy_from_kernel_nofault_allowed
0.18 ± 3% -0.0 0.16 ± 3% perf-profile.children.cycles-pp.rseq_get_rseq_cs
0.20 ± 2% -0.0 0.18 ± 2% perf-profile.children.cycles-pp.rseq_update_cpu_node_id
0.28 -0.0 0.26 perf-profile.children.cycles-pp.x64_sys_call
0.14 -0.0 0.12 ± 5% perf-profile.children.cycles-pp.__get_user_nocheck_4
0.10 ± 4% -0.0 0.09 ± 5% perf-profile.children.cycles-pp.uprobe_mmap
0.42 -0.0 0.40 perf-profile.children.cycles-pp.mas_prev_node
0.12 ± 9% -0.0 0.10 ± 6% perf-profile.children.cycles-pp.entry_SYSCALL_64_safe_stack
0.13 -0.0 0.12 ± 4% perf-profile.children.cycles-pp.find_vma
0.12 ± 4% -0.0 0.11 perf-profile.children.cycles-pp.__put_user_8
0.13 ± 2% -0.0 0.11 ± 4% perf-profile.children.cycles-pp.amd_clear_divider
0.12 ± 3% -0.0 0.11 ± 4% perf-profile.children.cycles-pp.mas_put_in_tree
0.10 -0.0 0.09 ± 5% perf-profile.children.cycles-pp.vma_interval_tree_augment_rotate
0.10 ± 3% -0.0 0.09 ± 4% perf-profile.children.cycles-pp.vm_stat_account
0.08 ± 5% -0.0 0.07 perf-profile.children.cycles-pp.mas_data_end
0.10 -0.0 0.09 ± 4% perf-profile.children.cycles-pp.error_entry
0.09 -0.0 0.08 perf-profile.children.cycles-pp.__arch_override_mprotect_pkey
0.19 +0.0 0.20 perf-profile.children.cycles-pp.mas_prev
0.08 +0.0 0.09 ± 5% perf-profile.children.cycles-pp.mas_prev_setup
0.37 +0.0 0.39 perf-profile.children.cycles-pp.mas_ascend
0.06 +0.0 0.08 ± 6% perf-profile.children.cycles-pp.send_signal_locked
0.47 +0.0 0.49 perf-profile.children.cycles-pp.__set_current_blocked
0.10 ± 3% +0.0 0.12 ± 4% perf-profile.children.cycles-pp.prepare_signal
0.03 ± 70% +0.0 0.06 perf-profile.children.cycles-pp.perf_output_put_handle
0.54 +0.0 0.57 ± 2% perf-profile.children.cycles-pp.rcu_segcblist_enqueue
0.52 +0.0 0.56 perf-profile.children.cycles-pp.__bad_area
0.48 +0.0 0.52 perf-profile.children.cycles-pp.up_read
0.88 +0.0 0.92 perf-profile.children.cycles-pp.__x64_sys_rt_sigprocmask
0.00 +0.1 0.05 perf-profile.children.cycles-pp.__init_rwsem
0.28 ± 2% +0.1 0.33 ± 2% perf-profile.children.cycles-pp.__perf_sw_event
0.36 +0.1 0.42 perf-profile.children.cycles-pp.mas_next_node
0.41 +0.1 0.47 ± 2% perf-profile.children.cycles-pp.fput
0.89 ± 4% +0.1 0.96 ± 2% perf-profile.children.cycles-pp.perf_output_begin
0.08 +0.1 0.15 ± 3% perf-profile.children.cycles-pp.mas_node_count_gfp
0.63 +0.1 0.71 perf-profile.children.cycles-pp.sigprocmask
0.83 +0.1 0.91 perf-profile.children.cycles-pp.tlb_gather_mmu
0.85 +0.1 0.94 perf-profile.children.cycles-pp.tlb_finish_mmu
1.86 +0.1 1.95 perf-profile.children.cycles-pp.down_write_killable
1.77 +0.1 1.88 perf-profile.children.cycles-pp.mas_preallocate
0.89 +0.1 1.03 perf-profile.children.cycles-pp.recalc_sigpending
5.06 +0.4 5.47 perf-profile.children.cycles-pp.up_write
14.39 +1.5 15.86 perf-profile.children.cycles-pp.force_sig_info_to_task
14.51 +1.5 15.99 perf-profile.children.cycles-pp.force_sig_fault
12.57 +1.5 14.05 perf-profile.children.cycles-pp.__sigqueue_alloc
14.72 +1.5 16.22 perf-profile.children.cycles-pp.__bad_area_nosemaphore
13.13 +1.5 14.64 perf-profile.children.cycles-pp.__send_signal_locked
16.64 +1.5 18.16 perf-profile.children.cycles-pp.exc_page_fault
12.16 +1.5 13.67 perf-profile.children.cycles-pp.inc_rlimit_get_ucounts
15.30 +1.5 16.83 perf-profile.children.cycles-pp.bad_area_access_error
16.04 +2.3 18.35 perf-profile.children.cycles-pp.irqentry_exit_to_user_mode
15.92 +2.3 18.23 perf-profile.children.cycles-pp.arch_do_signal_or_restart
10.32 +2.7 12.98 perf-profile.children.cycles-pp.do_dec_rlimit_put_ucounts
12.20 +2.7 14.87 perf-profile.children.cycles-pp.get_signal
36.12 +3.3 39.41 perf-profile.children.cycles-pp.stress_mprotect_mem
35.30 +3.5 38.83 perf-profile.children.cycles-pp.asm_exc_page_fault
3.60 -0.4 3.18 perf-profile.self.cycles-pp.stress_mprotect_mem
3.11 -0.4 2.69 ± 3% perf-profile.self.cycles-pp.__slab_free
3.55 -0.4 3.19 perf-profile.self.cycles-pp.do_mprotect_pkey
2.92 -0.3 2.59 perf-profile.self.cycles-pp.clear_bhb_loop
2.26 ± 3% -0.3 2.00 ± 8% perf-profile.self.cycles-pp.perf_event_mmap_output
1.70 ± 2% -0.2 1.48 ± 3% perf-profile.self.cycles-pp.vma_interval_tree_insert
1.23 ± 2% -0.2 1.06 ± 3% perf-profile.self.cycles-pp.mas_wr_node_store
1.16 ± 2% -0.2 1.00 ± 4% perf-profile.self.cycles-pp.rwsem_spin_on_owner
1.07 -0.1 0.94 perf-profile.self.cycles-pp.entry_SYSRETQ_unsafe_stack
1.93 -0.1 1.80 perf-profile.self.cycles-pp.mas_walk
0.63 -0.1 0.52 ± 2% perf-profile.self.cycles-pp.apparmor_file_mprotect
0.92 -0.1 0.82 perf-profile.self.cycles-pp.__split_vma
0.88 -0.1 0.77 perf-profile.self.cycles-pp.stress_mwc16modn
1.11 -0.1 1.00 ± 3% perf-profile.self.cycles-pp.vma_interval_tree_remove
0.88 -0.1 0.78 perf-profile.self.cycles-pp.sync_regs
0.73 -0.1 0.64 perf-profile.self.cycles-pp.native_irq_return_iret
0.71 -0.1 0.62 perf-profile.self.cycles-pp.copy_fpstate_to_sigframe
0.86 -0.1 0.77 perf-profile.self.cycles-pp.stress_mwc32modn
0.44 -0.1 0.36 ± 3% perf-profile.self.cycles-pp.rcu_cblist_dequeue
0.71 -0.1 0.64 ± 2% perf-profile.self.cycles-pp.kmem_cache_alloc_noprof
0.62 -0.1 0.56 perf-profile.self.cycles-pp.__memcg_slab_post_alloc_hook
0.54 -0.1 0.48 perf-profile.self.cycles-pp.mas_find
0.55 -0.1 0.50 perf-profile.self.cycles-pp.can_modify_mm
0.43 -0.1 0.38 perf-profile.self.cycles-pp.kmem_cache_free
0.56 -0.0 0.51 perf-profile.self.cycles-pp.do_syscall_64
0.44 -0.0 0.39 perf-profile.self.cycles-pp.entry_SYSCALL_64
0.43 -0.0 0.38 perf-profile.self.cycles-pp.entry_SYSCALL_64_after_hwframe
0.57 ± 2% -0.0 0.52 ± 4% perf-profile.self.cycles-pp.__call_rcu_common
0.56 ± 2% -0.0 0.51 perf-profile.self.cycles-pp.mt_find
0.35 -0.0 0.31 perf-profile.self.cycles-pp.fpu__clear_user_states
0.37 -0.0 0.33 ± 2% perf-profile.self.cycles-pp.obj_cgroup_charge
0.43 -0.0 0.39 perf-profile.self.cycles-pp.mod_objcg_state
0.32 ± 3% -0.0 0.28 ± 2% perf-profile.self.cycles-pp.perf_event_mmap
0.24 -0.0 0.20 ± 3% perf-profile.self.cycles-pp.mas_wr_store_entry
0.32 -0.0 0.28 ± 3% perf-profile.self.cycles-pp.__rb_insert_augmented
0.43 -0.0 0.39 perf-profile.self.cycles-pp.ima_file_mprotect
0.41 -0.0 0.37 perf-profile.self.cycles-pp.mtree_load
0.22 -0.0 0.18 ± 2% perf-profile.self.cycles-pp.vm_area_free_rcu_cb
0.36 -0.0 0.32 ± 2% perf-profile.self.cycles-pp.__memcg_slab_free_hook
0.42 -0.0 0.39 perf-profile.self.cycles-pp.mas_next_slot
1.35 -0.0 1.32 perf-profile.self.cycles-pp.__mprotect
0.41 -0.0 0.38 perf-profile.self.cycles-pp.syscall_return_via_sysret
0.50 ± 2% -0.0 0.47 ± 2% perf-profile.self.cycles-pp.perf_event_mmap_event
0.18 ± 4% -0.0 0.15 ± 12% perf-profile.self.cycles-pp.__memcpy
0.36 ± 2% -0.0 0.32 ± 2% perf-profile.self.cycles-pp.kfree
0.18 ± 2% -0.0 0.15 ± 3% perf-profile.self.cycles-pp.strlen
0.28 -0.0 0.25 ± 3% perf-profile.self.cycles-pp.x64_setup_rt_frame
0.24 -0.0 0.21 perf-profile.self.cycles-pp.syscall_exit_to_user_mode_prepare
0.19 ± 5% -0.0 0.16 ± 4% perf-profile.self.cycles-pp.__perf_event_header__init_id
0.21 ± 2% -0.0 0.18 ± 2% perf-profile.self.cycles-pp.save_xstate_epilog
0.12 -0.0 0.09 ± 4% perf-profile.self.cycles-pp.simple_dname
0.20 ± 2% -0.0 0.18 ± 7% perf-profile.self.cycles-pp.rwsem_down_write_slowpath
0.06 -0.0 0.03 ± 70% perf-profile.self.cycles-pp.force_sig_info_to_task
0.20 ± 2% -0.0 0.17 ± 2% perf-profile.self.cycles-pp.mas_wr_end_piv
0.21 ± 3% -0.0 0.19 ± 3% perf-profile.self.cycles-pp._copy_from_user
0.14 ± 4% -0.0 0.12 ± 4% perf-profile.self.cycles-pp.mas_leaf_max_gap
0.20 ± 3% -0.0 0.18 ± 3% perf-profile.self.cycles-pp.native_sched_clock
0.31 ± 2% -0.0 0.28 perf-profile.self.cycles-pp.syscall_exit_to_user_mode
0.19 ± 3% -0.0 0.17 ± 2% perf-profile.self.cycles-pp.__put_user_nocheck_4
0.15 ± 2% -0.0 0.13 ± 4% perf-profile.self.cycles-pp.vm_get_page_prot
0.36 -0.0 0.34 ± 2% perf-profile.self.cycles-pp.___slab_alloc
0.18 ± 2% -0.0 0.16 ± 2% perf-profile.self.cycles-pp.rseq_update_cpu_node_id
0.08 ± 4% -0.0 0.06 ± 6% perf-profile.self.cycles-pp.aa_file_perm
0.38 -0.0 0.36 perf-profile.self.cycles-pp.mprotect_fixup
0.26 -0.0 0.25 perf-profile.self.cycles-pp.mas_pop_node
0.15 ± 2% -0.0 0.13 perf-profile.self.cycles-pp.pthread_sigmask
0.23 ± 2% -0.0 0.21 perf-profile.self.cycles-pp.vma_wants_writenotify
0.28 -0.0 0.26 ± 2% perf-profile.self.cycles-pp.copy_from_kernel_nofault
0.14 ± 3% -0.0 0.12 perf-profile.self.cycles-pp.mas_prev_node
0.13 -0.0 0.11 ± 6% perf-profile.self.cycles-pp.__get_user_nocheck_4
0.12 -0.0 0.10 ± 4% perf-profile.self.cycles-pp.arch_do_signal_or_restart
0.11 ± 6% -0.0 0.10 ± 4% perf-profile.self.cycles-pp.entry_SYSCALL_64_safe_stack
0.09 -0.0 0.07 ± 6% perf-profile.self.cycles-pp.uprobe_mmap
0.28 -0.0 0.27 perf-profile.self.cycles-pp.get_signal
0.23 -0.0 0.22 ± 2% perf-profile.self.cycles-pp.x64_sys_call
0.11 ± 3% -0.0 0.09 ± 5% perf-profile.self.cycles-pp.copy_from_kernel_nofault_allowed
0.12 ± 4% -0.0 0.10 perf-profile.self.cycles-pp.__put_user_8
0.18 ± 2% -0.0 0.17 ± 4% perf-profile.self.cycles-pp.__task_pid_nr_ns
0.10 ± 3% -0.0 0.09 ± 4% perf-profile.self.cycles-pp.__x64_sys_mprotect
0.09 -0.0 0.08 ± 6% perf-profile.self.cycles-pp.vma_interval_tree_augment_rotate
0.11 -0.0 0.10 ± 4% perf-profile.self.cycles-pp.mas_put_in_tree
0.09 -0.0 0.08 ± 4% perf-profile.self.cycles-pp.error_entry
0.10 ± 3% -0.0 0.09 perf-profile.self.cycles-pp.stress_sig_handler
0.07 -0.0 0.06 perf-profile.self.cycles-pp.mas_data_end
0.08 -0.0 0.07 perf-profile.self.cycles-pp.handle_signal
0.06 -0.0 0.05 perf-profile.self.cycles-pp.rcu_do_batch
0.34 +0.0 0.35 perf-profile.self.cycles-pp.mas_ascend
0.09 +0.0 0.11 ± 4% perf-profile.self.cycles-pp.vma_adjust_trans_huge
0.54 +0.0 0.56 perf-profile.self.cycles-pp._raw_spin_lock_irq
0.16 ± 2% +0.0 0.18 perf-profile.self.cycles-pp.lock_vma_under_rcu
1.12 +0.0 1.14 perf-profile.self.cycles-pp.vma_merge
0.09 +0.0 0.12 ± 3% perf-profile.self.cycles-pp.prepare_signal
0.43 +0.0 0.46 perf-profile.self.cycles-pp.mas_preallocate
0.29 +0.0 0.32 perf-profile.self.cycles-pp.mas_prev_slot
0.52 +0.0 0.55 ± 2% perf-profile.self.cycles-pp.rcu_segcblist_enqueue
0.45 +0.0 0.50 perf-profile.self.cycles-pp.up_read
0.00 +0.1 0.05 perf-profile.self.cycles-pp.send_signal_locked
0.17 ± 2% +0.1 0.22 ± 2% perf-profile.self.cycles-pp.mas_next_node
0.80 ± 4% +0.1 0.86 ± 2% perf-profile.self.cycles-pp.perf_output_begin
0.13 ± 2% +0.1 0.19 perf-profile.self.cycles-pp.mas_alloc_nodes
0.38 +0.1 0.44 perf-profile.self.cycles-pp.fput
0.05 +0.1 0.12 ± 3% perf-profile.self.cycles-pp.mas_node_count_gfp
0.00 +0.1 0.07 ± 6% perf-profile.self.cycles-pp.__perf_sw_event
0.77 +0.1 0.85 perf-profile.self.cycles-pp.tlb_gather_mmu
0.79 +0.1 0.88 perf-profile.self.cycles-pp.tlb_finish_mmu
1.52 +0.1 1.66 perf-profile.self.cycles-pp.down_write_killable
0.88 +0.1 1.02 perf-profile.self.cycles-pp.recalc_sigpending
4.50 +0.5 4.96 perf-profile.self.cycles-pp.up_write
12.16 +1.5 13.67 perf-profile.self.cycles-pp.inc_rlimit_get_ucounts
10.32 +2.7 12.98 perf-profile.self.cycles-pp.do_dec_rlimit_put_ucounts
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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