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Message-ID: <20231204164809.y7wehmtr6kfcgg65@revolver>
Date: Mon, 4 Dec 2023 11:48:09 -0500
From: "Liam R. Howlett" <Liam.Howlett@...cle.com>
To: Peng Zhang <zhangpeng.00@...edance.com>
Cc: oe-lkp@...ts.linux.dev, lkp@...el.com,
Linux Memory Management List <linux-mm@...ck.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Christian Brauner <brauner@...nel.org>,
Jonathan Corbet <corbet@....net>,
Mateusz Guzik <mjguzik@...il.com>,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
Matthew Wilcox <willy@...radead.org>,
"Michael S. Tsirkin" <mst@...hat.com>,
Mike Christie <michael.christie@...cle.com>,
Nicholas Piggin <npiggin@...il.com>,
Peter Zijlstra <peterz@...radead.org>,
Suren Baghdasaryan <surenb@...gle.com>,
linux-kernel@...r.kernel.org, ying.huang@...el.com,
feng.tang@...el.com, fengwei.yin@...el.com,
kernel test robot <oliver.sang@...el.com>
Subject: Re: [linux-next:master] [fork] 6e553c6bcb:
will-it-scale.per_process_ops 94.7% improvement
* Peng Zhang <zhangpeng.00@...edance.com> [231204 02:15]:
>
>
> 在 2023/11/28 21:55, kernel test robot 写道:
> >
> >
> > Hello,
> >
> > kernel test robot noticed a 94.7% improvement of will-it-scale.per_process_ops on:
> >
> >
> > commit: 6e553c6bcb7746abad29ce63e0cb7a18348e88fb ("fork: use __mt_dup() to duplicate maple tree in dup_mmap()")
> > https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
> >
> > testcase: will-it-scale
> > test machine: 104 threads 2 sockets (Skylake) with 192G memory
> > parameters:
> >
> > nr_task: 100%
> > mode: process
> > test: brk2
> > cpufreq_governor: performance
> >
> >
> >
> >
> >
> >
> > Details are as below:
> > -------------------------------------------------------------------------------------------------->
> >
> >
> > The kernel config and materials to reproduce are available at:
> > https://download.01.org/0day-ci/archive/20231128/202311282145.ff13737b-oliver.sang@intel.com
> >
> > =========================================================================================
> > compiler/cpufreq_governor/kconfig/mode/nr_task/rootfs/tbox_group/test/testcase:
> > gcc-12/performance/x86_64-rhel-8.3/process/100%/debian-11.1-x86_64-20220510.cgz/lkp-skl-fpga01/brk2/will-it-scale
> >
> > commit:
> > ec81deb6b7 ("maple_tree: preserve the tree attributes when destroying maple tree")
> > 6e553c6bcb ("fork: use __mt_dup() to duplicate maple tree in dup_mmap()")
> >
> > ec81deb6b769dc1b 6e553c6bcb7746abad29ce63e0c
> > ---------------- ---------------------------
> > %stddev %change %stddev
> > \ | \
> > 24.47 -7.2 17.29 mpstat.cpu.all.soft%
> > 8.76 +7.6 16.36 mpstat.cpu.all.usr%
> > 8.80 +85.5% 16.33 vmstat.cpu.us
> > 7732 -18.3% 6318 vmstat.system.cs
> > 13467005 +94.7% 26223847 will-it-scale.104.processes
> > 129489 +94.7% 252151 will-it-scale.per_process_ops
> > 13467005 +94.7% 26223847 will-it-scale.workload
> > 1.792e+08 -13.6% 1.549e+08 numa-numastat.node0.local_node
> > 1.793e+08 -13.6% 1.549e+08 numa-numastat.node0.numa_hit
> > 1.867e+08 -12.6% 1.631e+08 numa-numastat.node1.local_node
> > 1.867e+08 -12.6% 1.632e+08 numa-numastat.node1.numa_hit
> > 1.793e+08 -13.6% 1.549e+08 numa-vmstat.node0.numa_hit
> > 1.792e+08 -13.6% 1.549e+08 numa-vmstat.node0.numa_local
> > 1.867e+08 -12.6% 1.631e+08 numa-vmstat.node1.numa_hit
> > 1.867e+08 -12.6% 1.631e+08 numa-vmstat.node1.numa_local
> > 122.70 +43.4 166.10 turbostat.PKG_%
> > 56.67 ± 2% -6.8% 52.83 ± 3% turbostat.PkgTmp
> > 376.36 +1.3% 381.14 turbostat.PkgWatt
> > 45.03 -5.8% 42.40 turbostat.RAMWatt
> > 121103 -2.7% 117803 proc-vmstat.nr_slab_unreclaimable
> > 68338 ± 7% +24.8% 85281 ± 6% proc-vmstat.numa_hint_faults
> > 3.66e+08 -13.1% 3.181e+08 proc-vmstat.numa_hit
> > 3.659e+08 -13.1% 3.18e+08 proc-vmstat.numa_local
> > 7.155e+08 -15.6% 6.038e+08 proc-vmstat.pgalloc_normal
> > 1025781 +2.6% 1052377 proc-vmstat.pgfault
> > 7.131e+08 -15.5% 6.028e+08 proc-vmstat.pgfree
> > 12305161 +10.3% 13578139 sched_debug.cfs_rq:/.avg_vruntime.avg
> > 12419603 +10.6% 13739004 sched_debug.cfs_rq:/.avg_vruntime.max
> > 122981 ± 5% +41.3% 173809 ± 12% sched_debug.cfs_rq:/.avg_vruntime.stddev
> > 376.33 ± 43% -53.5% 174.89 ± 34% sched_debug.cfs_rq:/.load_avg.avg
> > 85.75 ± 9% -59.1% 35.08 ± 16% sched_debug.cfs_rq:/.load_avg.min
> > 12305176 +10.3% 13578151 sched_debug.cfs_rq:/.min_vruntime.avg
> > 12419621 +10.6% 13739007 sched_debug.cfs_rq:/.min_vruntime.max
> > 122979 ± 5% +41.3% 173810 ± 12% sched_debug.cfs_rq:/.min_vruntime.stddev
> > 13056 -15.6% 11025 sched_debug.cpu.nr_switches.avg
> > 9228 -22.3% 7174 sched_debug.cpu.nr_switches.min
> > 0.28 ± 7% -63.7% 0.10 ± 10% perf-sched.sch_delay.avg.ms.schedule_timeout.rcu_gp_fqs_loop.rcu_gp_kthread.kthread
> > 0.08 ± 5% -27.0% 0.06 ± 8% perf-sched.sch_delay.avg.ms.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm
> > 3.56 ± 45% -79.6% 0.73 ±199% perf-sched.sch_delay.max.ms.__cond_resched.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm
> > 10.02 ± 62% -70.0% 3.01 ± 2% perf-sched.sch_delay.max.ms.schedule_timeout.rcu_gp_fqs_loop.rcu_gp_kthread.kthread
> > 11.16 ± 29% -48.2% 5.78 ± 45% perf-sched.sch_delay.max.ms.wait_for_partner.fifo_open.do_dentry_open.do_open
> > 41.80 +25.8% 52.58 perf-sched.total_wait_and_delay.average.ms
> > 37576 ± 2% -21.0% 29680 perf-sched.total_wait_and_delay.count.ms
> > 41.73 +25.8% 52.50 perf-sched.total_wait_time.average.ms
> > 4.50 ± 2% -16.1% 3.78 ± 6% perf-sched.wait_and_delay.avg.ms.__cond_resched.down_write.__split_vma.do_vmi_align_munmap.__do_sys_brk
> > 4.61 ± 6% -18.0% 3.78 ± 2% perf-sched.wait_and_delay.avg.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> > 4.26 ± 7% -11.7% 3.77 perf-sched.wait_and_delay.avg.ms.__cond_resched.kmem_cache_alloc.mas_alloc_nodes.mas_preallocate.__split_vma
> > 32.16 +53.0% 49.20 perf-sched.wait_and_delay.avg.ms.__cond_resched.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm
> > 63.20 +35.4% 85.56 ± 2% perf-sched.wait_and_delay.avg.ms.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm
> > 735.00 ± 2% -68.0% 234.83 ± 4% perf-sched.wait_and_delay.count.__cond_resched.down_write.__split_vma.do_vmi_align_munmap.__do_sys_brk
> > 3090 ± 6% -93.8% 190.50 ± 4% perf-sched.wait_and_delay.count.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> > 975.67 ± 3% +61.5% 1576 perf-sched.wait_and_delay.count.__cond_resched.down_write_killable.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> > 298.17 ± 4% +54.6% 461.00 ± 4% perf-sched.wait_and_delay.count.__cond_resched.kmem_cache_alloc.mas_alloc_nodes.mas_preallocate.__split_vma
> > 524.33 ± 4% +56.2% 819.17 ± 2% perf-sched.wait_and_delay.count.__cond_resched.kmem_cache_alloc.mas_alloc_nodes.mas_preallocate.do_brk_flags
> > 402.83 ± 2% +54.2% 621.17 ± 3% perf-sched.wait_and_delay.count.__cond_resched.kmem_cache_alloc.vm_area_dup.__split_vma.do_vmi_align_munmap
> > 265.50 ± 4% +28.7% 341.67 ± 2% perf-sched.wait_and_delay.count.__cond_resched.remove_vma.do_vmi_align_munmap.__do_sys_brk.do_syscall_64
> > 661.33 ± 7% -27.6% 478.83 ± 10% perf-sched.wait_and_delay.count.__cond_resched.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm
> > 66.33 ±141% +310.3% 272.17 ± 7% perf-sched.wait_and_delay.count.__cond_resched.zap_pmd_range.isra.0.unmap_page_range
> > 1517 ± 4% +72.0% 2609 perf-sched.wait_and_delay.count.exit_to_user_mode_loop.exit_to_user_mode_prepare.irqentry_exit_to_user_mode.asm_sysvec_apic_timer_interrupt
> > 6322 ± 3% -41.1% 3725 ± 4% perf-sched.wait_and_delay.count.exit_to_user_mode_loop.exit_to_user_mode_prepare.syscall_exit_to_user_mode.do_syscall_64
> > 14299 ± 2% -25.3% 10677 perf-sched.wait_and_delay.count.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm
> > 19.65 ± 25% -38.8% 12.03 ± 7% perf-sched.wait_and_delay.max.ms.__cond_resched.down_write.__split_vma.do_vmi_align_munmap.__do_sys_brk
> > 20.07 ± 27% -42.3% 11.57 ± 8% perf-sched.wait_and_delay.max.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> > 18.62 ± 28% -32.5% 12.56 ± 12% perf-sched.wait_and_delay.max.ms.__cond_resched.kmem_cache_alloc.vm_area_dup.__split_vma.do_vmi_align_munmap
> > 71.03 ± 10% +44.2% 102.39 ± 36% perf-sched.wait_and_delay.max.ms.__cond_resched.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm
> > 23.72 ± 26% -33.5% 15.79 ± 12% perf-sched.wait_and_delay.max.ms.__cond_resched.unmap_vmas.unmap_region.constprop.0
> > 14.70 ± 21% -33.3% 9.80 ± 2% perf-sched.wait_and_delay.max.ms.schedule_timeout.rcu_gp_fqs_loop.rcu_gp_kthread.kthread
> > 4.50 ± 2% -16.1% 3.78 ± 6% perf-sched.wait_time.avg.ms.__cond_resched.down_write.__split_vma.do_vmi_align_munmap.__do_sys_brk
> > 4.61 ± 6% -18.0% 3.78 ± 2% perf-sched.wait_time.avg.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> > 4.26 ± 7% -11.7% 3.77 perf-sched.wait_time.avg.ms.__cond_resched.kmem_cache_alloc.mas_alloc_nodes.mas_preallocate.__split_vma
> > 4.26 ± 9% -100.0% 0.00 perf-sched.wait_time.avg.ms.__cond_resched.kmem_cache_alloc_bulk.mas_alloc_nodes.mas_preallocate.__split_vma
> > 4.61 ± 3% -100.0% 0.00 perf-sched.wait_time.avg.ms.__cond_resched.kmem_cache_alloc_bulk.mas_alloc_nodes.mas_preallocate.do_brk_flags
> > 32.13 +53.1% 49.19 perf-sched.wait_time.avg.ms.__cond_resched.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm
> > 63.12 +35.5% 85.50 ± 2% perf-sched.wait_time.avg.ms.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm
> > 19.65 ± 25% -38.8% 12.03 ± 7% perf-sched.wait_time.max.ms.__cond_resched.down_write.__split_vma.do_vmi_align_munmap.__do_sys_brk
> > 20.07 ± 27% -42.3% 11.57 ± 8% perf-sched.wait_time.max.ms.__cond_resched.down_write.do_brk_flags.__do_sys_brk.do_syscall_64
> > 18.62 ± 28% -32.5% 12.56 ± 12% perf-sched.wait_time.max.ms.__cond_resched.kmem_cache_alloc.vm_area_dup.__split_vma.do_vmi_align_munmap
> > 16.69 ± 36% -100.0% 0.00 perf-sched.wait_time.max.ms.__cond_resched.kmem_cache_alloc_bulk.mas_alloc_nodes.mas_preallocate.__split_vma
> > 16.03 ± 17% -100.0% 0.00 perf-sched.wait_time.max.ms.__cond_resched.kmem_cache_alloc_bulk.mas_alloc_nodes.mas_preallocate.do_brk_flags
> > 70.43 ± 10% +45.4% 102.38 ± 36% perf-sched.wait_time.max.ms.__cond_resched.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm
> > 23.72 ± 26% -33.5% 15.79 ± 12% perf-sched.wait_time.max.ms.__cond_resched.unmap_vmas.unmap_region.constprop.0
> > 17.57 ± 34% -29.3% 12.43 ± 7% perf-sched.wait_time.max.ms.__cond_resched.zap_pmd_range.isra.0.unmap_page_range
> > 8.69 ± 9% -20.8% 6.88 perf-sched.wait_time.max.ms.schedule_timeout.rcu_gp_fqs_loop.rcu_gp_kthread.kthread
> > 2.62 -12.2% 2.30 perf-stat.i.MPKI
> > 2.471e+10 +5.8% 2.614e+10 perf-stat.i.branch-instructions
> > 0.82 +0.1 0.90 ± 3% perf-stat.i.branch-miss-rate%
> > 2.032e+08 +14.1% 2.319e+08 perf-stat.i.branch-misses
> > 61.39 +1.3 62.74 perf-stat.i.cache-miss-rate%
> > 3.567e+08 -14.2% 3.061e+08 perf-stat.i.cache-misses
> > 5.81e+08 -16.2% 4.871e+08 perf-stat.i.cache-references
> > 7695 -18.5% 6271 perf-stat.i.context-switches
> > 2.04 +2.6% 2.09 perf-stat.i.cpi
> > 249.60 -26.8% 182.76 perf-stat.i.cpu-migrations
> > 780.53 +16.7% 911.09 perf-stat.i.cycles-between-cache-misses
> > 0.05 +0.0 0.08 ± 4% perf-stat.i.dTLB-load-miss-rate%
> > 15775916 +75.7% 27724344 perf-stat.i.dTLB-load-misses
> > 3.43e+10 +5.8% 3.63e+10 perf-stat.i.dTLB-loads
> > 459336 ± 4% -18.1% 376380 ± 10% perf-stat.i.dTLB-store-misses
> > 2.189e+10 -2.7% 2.13e+10 perf-stat.i.dTLB-stores
> > 31159069 +37.1% 42716400 perf-stat.i.iTLB-load-misses
> > 456253 ± 4% +83.6% 837671 ± 31% perf-stat.i.iTLB-loads
> > 1.364e+11 -1.9% 1.337e+11 perf-stat.i.instructions
> > 4379 -28.5% 3131 perf-stat.i.instructions-per-iTLB-miss
> > 0.49 -2.1% 0.48 perf-stat.i.ipc
> > 1327 -23.4% 1017 perf-stat.i.metric.K/sec
> > 783.30 +3.4% 809.81 perf-stat.i.metric.M/sec
> > 2733 +2.7% 2807 perf-stat.i.minor-faults
> > 4668970 -23.7% 3562283 ± 12% perf-stat.i.node-load-misses
> > 44341556 -21.0% 35024109 ± 2% perf-stat.i.node-loads
> > 2.44 -0.5 1.91 ± 9% perf-stat.i.node-store-miss-rate%
> > 2146790 -44.9% 1183052 ± 2% perf-stat.i.node-store-misses
> > 85964398 -24.9% 64569512 ± 2% perf-stat.i.node-stores
> > 2733 +2.7% 2807 perf-stat.i.page-faults
> > 2.62 -12.5% 2.29 perf-stat.overall.MPKI
> > 0.82 +0.1 0.89 perf-stat.overall.branch-miss-rate%
> > 61.39 +1.4 62.83 perf-stat.overall.cache-miss-rate%
> > 2.04 +2.1% 2.08 perf-stat.overall.cpi
> > 780.25 +16.6% 910.13 perf-stat.overall.cycles-between-cache-misses
> > 0.05 +0.0 0.08 perf-stat.overall.dTLB-load-miss-rate%
> > 0.00 ± 4% -0.0 0.00 ± 10% perf-stat.overall.dTLB-store-miss-rate%
> > 4376 -28.5% 3130 perf-stat.overall.instructions-per-iTLB-miss
> > 0.49 -2.0% 0.48 perf-stat.overall.ipc
> > 2.44 -0.6 1.80 ± 2% perf-stat.overall.node-store-miss-rate%
> > 3051945 -49.6% 1539638 perf-stat.overall.path-length
> > 2.462e+10 +5.8% 2.605e+10 perf-stat.ps.branch-instructions
> > 2.025e+08 +14.1% 2.311e+08 perf-stat.ps.branch-misses
> > 3.555e+08 -14.2% 3.051e+08 perf-stat.ps.cache-misses
> > 5.791e+08 -16.2% 4.855e+08 perf-stat.ps.cache-references
> > 7668 -18.5% 6250 perf-stat.ps.context-switches
> > 248.68 -26.7% 182.19 perf-stat.ps.cpu-migrations
> > 15739140 +75.6% 27640979 perf-stat.ps.dTLB-load-misses
> > 3.418e+10 +5.8% 3.618e+10 perf-stat.ps.dTLB-loads
> > 458389 ± 4% -18.1% 375627 ± 10% perf-stat.ps.dTLB-store-misses
> > 2.181e+10 -2.7% 2.123e+10 perf-stat.ps.dTLB-stores
> > 31053977 +37.1% 42572874 perf-stat.ps.iTLB-load-misses
> > 454414 ± 4% +83.8% 835372 ± 31% perf-stat.ps.iTLB-loads
> > 1.359e+11 -1.9% 1.333e+11 perf-stat.ps.instructions
> > 2730 +2.6% 2802 perf-stat.ps.minor-faults
> > 4653258 -23.7% 3549888 ± 12% perf-stat.ps.node-load-misses
> > 44203348 -21.0% 34917073 ± 2% perf-stat.ps.node-loads
> > 2139791 -44.9% 1179122 ± 2% perf-stat.ps.node-store-misses
> > 85677729 -24.9% 64357015 ± 2% perf-stat.ps.node-stores
> > 2731 +2.6% 2803 perf-stat.ps.page-faults
> > 4.11e+13 -1.8% 4.038e+13 perf-stat.total.instructions
> > 33.52 -19.0 14.50 perf-profile.calltrace.cycles-pp.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> > 17.05 -14.1 2.93 perf-profile.calltrace.cycles-pp.mas_store_prealloc.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> Hi, Liam
>
> From the performance data shown above, we can see that there is a
> significant variation in the overhead of mas_store_prealloc() within
> the do_brk_flags() function. I speculate that the maple tree duplicated
> through __mt_dup() has a different structure compared to the maple tree
> duplicated through bulk store. In this test case, the maple tree duplicated
> through __mt_dup() triggers a fast path for maple tree store operations,
> thus avoiding memory allocation. It also avoids the slow path for maple
> tree store operations.
>
Hi Peng,
Thanks for the analysis. I would expect such a difference to be
equalised the first loop - the maple tree would be expanded to make
space and then contracted, but each new loop should cause a node store.
If your speculation is correct, then we were causing a contraction
followed by an expansion; effectively 'jittering' after a fork. I will
add this to the work items to investigate and see if we are not hitting
this in other scenarios.
This speculation looks correct considering we see a reduction of
spanning stores and associated allocations/cleanup. I'm guessing we
filled the nodes too much and the brk VMA was the last entry in a node,
and so we end up rebalancing to relocate that entry and constantly hit
our worst case. It's probably never fixed to avoid causing a larger
rebalance event. Hopefully this only shows up in the old fork method.
There is also a lot of down_write and __split_vma delta, which is odd.
Perhaps the __split_vma could be explained by the jittering during a
split. Maybe the down_write is due to the excessive time in allocations
and thus potentially triggering a timeout that ends up causing a
rescheduling.
Either way, this is a welcomed result. Thanks for having a look at
these numbers, and for the patches that caused them.
Apologies for leaving all the benchmarking data in the reply, but
perhaps there is more to add that I've missed in this data.
Regards,
Liam
> > 11.58 -11.6 0.00 perf-profile.calltrace.cycles-pp.___slab_alloc.__kmem_cache_alloc_bulk.kmem_cache_alloc_bulk.mas_alloc_nodes.mas_preallocate
> > 10.92 -10.9 0.00 perf-profile.calltrace.cycles-pp.kmem_cache_alloc_bulk.mas_alloc_nodes.mas_preallocate.do_brk_flags.__do_sys_brk
> > 10.60 -10.6 0.00 perf-profile.calltrace.cycles-pp.__kmem_cache_alloc_bulk.kmem_cache_alloc_bulk.mas_alloc_nodes.mas_preallocate.do_brk_flags
> > 10.54 -10.5 0.00 perf-profile.calltrace.cycles-pp.mas_wr_bnode.mas_store_prealloc.vma_complete.__split_vma.do_vmi_align_munmap
> > 10.26 -10.3 0.00 perf-profile.calltrace.cycles-pp.mas_wr_spanning_store.mas_store_prealloc.do_brk_flags.__do_sys_brk.do_syscall_64
> > 11.70 -9.9 1.78 perf-profile.calltrace.cycles-pp.mas_alloc_nodes.mas_preallocate.do_brk_flags.__do_sys_brk.do_syscall_64
> > 12.19 -9.2 2.97 perf-profile.calltrace.cycles-pp.mas_preallocate.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> > 69.63 -9.1 60.49 perf-profile.calltrace.cycles-pp.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> > 8.93 -8.9 0.00 perf-profile.calltrace.cycles-pp.mas_split.mas_wr_bnode.mas_store_prealloc.vma_complete.__split_vma
> > 7.42 -7.4 0.00 perf-profile.calltrace.cycles-pp.get_partial_node.___slab_alloc.__kmem_cache_alloc_bulk.kmem_cache_alloc_bulk.mas_alloc_nodes
> > 7.32 -7.3 0.00 perf-profile.calltrace.cycles-pp.mas_spanning_rebalance.mas_wr_spanning_store.mas_store_prealloc.do_brk_flags.__do_sys_brk
> > 12.16 -6.0 6.13 perf-profile.calltrace.cycles-pp.mas_store_prealloc.vma_complete.__split_vma.do_vmi_align_munmap.__do_sys_brk
> > 12.28 -5.9 6.43 perf-profile.calltrace.cycles-pp.vma_complete.__split_vma.do_vmi_align_munmap.__do_sys_brk.do_syscall_64
> > 6.38 -5.6 0.73 ± 2% perf-profile.calltrace.cycles-pp.mas_destroy.mas_store_prealloc.do_brk_flags.__do_sys_brk.do_syscall_64
> > 15.46 -5.0 10.49 ± 4% perf-profile.calltrace.cycles-pp.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm
> > 15.44 -5.0 10.48 ± 4% perf-profile.calltrace.cycles-pp.__do_softirq.run_ksoftirqd.smpboot_thread_fn.kthread.ret_from_fork
> > 15.44 -5.0 10.48 ± 4% perf-profile.calltrace.cycles-pp.run_ksoftirqd.smpboot_thread_fn.kthread.ret_from_fork.ret_from_fork_asm
> > 15.47 -5.0 10.50 ± 4% perf-profile.calltrace.cycles-pp.ret_from_fork_asm
> > 15.47 -5.0 10.50 ± 4% perf-profile.calltrace.cycles-pp.ret_from_fork.ret_from_fork_asm
> > 15.47 -5.0 10.50 ± 4% perf-profile.calltrace.cycles-pp.kthread.ret_from_fork.ret_from_fork_asm
> > 15.44 -5.0 10.48 ± 4% perf-profile.calltrace.cycles-pp.rcu_core.__do_softirq.run_ksoftirqd.smpboot_thread_fn.kthread
> > 15.42 -5.0 10.46 ± 4% perf-profile.calltrace.cycles-pp.rcu_do_batch.rcu_core.__do_softirq.run_ksoftirqd.smpboot_thread_fn
> > 74.20 -4.5 69.66 perf-profile.calltrace.cycles-pp.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> > 20.44 -3.4 17.09 perf-profile.calltrace.cycles-pp.__split_vma.do_vmi_align_munmap.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> > 3.84 -2.5 1.34 ± 4% perf-profile.calltrace.cycles-pp.__slab_free.rcu_do_batch.rcu_core.__do_softirq.run_ksoftirqd
> > 76.40 -2.4 74.03 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_after_hwframe.brk
> > 4.90 ± 2% -2.0 2.86 ± 4% perf-profile.calltrace.cycles-pp.rcu_core.__do_softirq.irq_exit_rcu.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt
> > 4.89 ± 2% -2.0 2.84 ± 4% perf-profile.calltrace.cycles-pp.rcu_do_batch.rcu_core.__do_softirq.irq_exit_rcu.sysvec_apic_timer_interrupt
> > 2.88 -1.9 1.03 perf-profile.calltrace.cycles-pp.mas_alloc_nodes.mas_preallocate.__split_vma.do_vmi_align_munmap.__do_sys_brk
> > 3.53 -1.3 2.22 perf-profile.calltrace.cycles-pp.mas_preallocate.__split_vma.do_vmi_align_munmap.__do_sys_brk.do_syscall_64
> > 0.95 ± 3% -0.2 0.71 ± 4% perf-profile.calltrace.cycles-pp.rcu_cblist_dequeue.rcu_do_batch.rcu_core.__do_softirq.run_ksoftirqd
> > 0.71 -0.1 0.62 ± 2% perf-profile.calltrace.cycles-pp.kmem_cache_free.rcu_do_batch.rcu_core.__do_softirq.run_ksoftirqd
> > 0.74 ± 3% +0.2 0.94 ± 4% perf-profile.calltrace.cycles-pp.__unfreeze_partials.rcu_do_batch.rcu_core.__do_softirq.irq_exit_rcu
> > 0.67 +0.3 0.97 ± 3% perf-profile.calltrace.cycles-pp.vm_area_free_rcu_cb.rcu_do_batch.rcu_core.__do_softirq.run_ksoftirqd
> > 0.56 ± 2% +0.4 0.97 ± 5% perf-profile.calltrace.cycles-pp.irq_exit_rcu.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt.syscall_enter_from_user_mode.do_syscall_64
> > 0.56 ± 2% +0.4 0.97 ± 5% perf-profile.calltrace.cycles-pp.__do_softirq.irq_exit_rcu.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt.syscall_enter_from_user_mode
> > 0.58 ± 2% +0.4 1.01 ± 5% perf-profile.calltrace.cycles-pp.asm_sysvec_apic_timer_interrupt.syscall_enter_from_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> > 0.58 ± 2% +0.4 1.01 ± 5% perf-profile.calltrace.cycles-pp.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt.syscall_enter_from_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe
> > 0.00 +0.5 0.51 perf-profile.calltrace.cycles-pp.mas_pop_node.mas_wr_node_store.mas_wr_store_entry.mas_store_gfp.do_vmi_align_munmap
> > 0.00 +0.5 0.52 ± 2% perf-profile.calltrace.cycles-pp.__pte_offset_map_lock.zap_pte_range.zap_pmd_range.unmap_page_range.unmap_vmas
> > 0.00 +0.5 0.53 ± 2% perf-profile.calltrace.cycles-pp.mas_pop_node.mas_wr_node_store.mas_wr_store_entry.mas_store_prealloc.vma_complete
> > 0.00 +0.5 0.54 perf-profile.calltrace.cycles-pp.mas_update_gap.mas_wr_node_store.mas_wr_store_entry.mas_store_prealloc.vma_complete
> > 0.43 ± 44% +0.5 0.97 perf-profile.calltrace.cycles-pp.zap_pte_range.zap_pmd_range.unmap_page_range.unmap_vmas.unmap_region
> > 0.00 +0.5 0.55 perf-profile.calltrace.cycles-pp.arch_get_unmapped_area_topdown.get_unmapped_area.check_brk_limits.__do_sys_brk.do_syscall_64
> > 0.63 ± 2% +0.6 1.18 perf-profile.calltrace.cycles-pp.get_unmapped_area.check_brk_limits.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> > 0.00 +0.6 0.56 ± 3% perf-profile.calltrace.cycles-pp.kmem_cache_free.mas_destroy.mas_store_prealloc.do_brk_flags.__do_sys_brk
> > 6.03 ± 2% +0.6 6.62 ± 4% perf-profile.calltrace.cycles-pp.__unfreeze_partials.rcu_do_batch.rcu_core.__do_softirq.run_ksoftirqd
> > 0.71 ± 2% +0.6 1.31 ± 4% perf-profile.calltrace.cycles-pp.syscall_enter_from_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> > 0.00 +0.6 0.63 ± 2% perf-profile.calltrace.cycles-pp.mas_update_gap.mas_wr_slot_store.mas_wr_store_entry.mas_store_prealloc.do_brk_flags
> > 0.73 ± 2% +0.6 1.36 perf-profile.calltrace.cycles-pp.check_brk_limits.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> > 0.00 +0.7 0.68 perf-profile.calltrace.cycles-pp.obj_cgroup_charge.kmem_cache_alloc.vm_area_dup.__split_vma.do_vmi_align_munmap
> > 0.00 +0.7 0.69 perf-profile.calltrace.cycles-pp.___slab_alloc.kmem_cache_alloc.mas_alloc_nodes.mas_preallocate.do_brk_flags
> > 0.74 ± 2% +0.7 1.46 perf-profile.calltrace.cycles-pp.zap_pmd_range.unmap_page_range.unmap_vmas.unmap_region.do_vmi_align_munmap
> > 0.00 +0.7 0.72 perf-profile.calltrace.cycles-pp.___slab_alloc.kmem_cache_alloc.mas_alloc_nodes.mas_wr_node_store.mas_wr_store_entry
> > 0.00 +0.7 0.72 perf-profile.calltrace.cycles-pp.kmem_cache_alloc.mas_alloc_nodes.mas_preallocate.__split_vma.do_vmi_align_munmap
> > 0.00 +0.7 0.74 perf-profile.calltrace.cycles-pp.allocate_slab.___slab_alloc.kmem_cache_alloc.vm_area_dup.__split_vma
> > 0.72 +0.7 1.46 perf-profile.calltrace.cycles-pp.memcg_slab_post_alloc_hook.kmem_cache_alloc.vm_area_dup.__split_vma.do_vmi_align_munmap
> > 0.00 +0.8 0.76 perf-profile.calltrace.cycles-pp.userfaultfd_unmap_complete.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> > 0.00 +0.8 0.78 perf-profile.calltrace.cycles-pp.down_write_killable.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> > 0.00 +0.8 0.80 ± 2% perf-profile.calltrace.cycles-pp.free_pgtables.unmap_region.do_vmi_align_munmap.__do_sys_brk.do_syscall_64
> > 1.00 ± 5% +0.9 1.89 ± 4% perf-profile.calltrace.cycles-pp.__do_softirq.irq_exit_rcu.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt.brk
> > 1.00 ± 5% +0.9 1.89 ± 4% perf-profile.calltrace.cycles-pp.irq_exit_rcu.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt.brk
> > 0.00 +0.9 0.89 perf-profile.calltrace.cycles-pp.mas_wr_slot_store.mas_wr_store_entry.mas_store_prealloc.do_brk_flags.__do_sys_brk
> > 1.03 ± 5% +0.9 1.94 ± 4% perf-profile.calltrace.cycles-pp.sysvec_apic_timer_interrupt.asm_sysvec_apic_timer_interrupt.brk
> > 0.56 +0.9 1.48 perf-profile.calltrace.cycles-pp.kmem_cache_alloc.mas_alloc_nodes.mas_preallocate.do_brk_flags.__do_sys_brk
> > 1.04 ± 4% +0.9 1.96 ± 4% perf-profile.calltrace.cycles-pp.asm_sysvec_apic_timer_interrupt.brk
> > 0.00 +1.0 0.98 perf-profile.calltrace.cycles-pp.___slab_alloc.kmem_cache_alloc.vm_area_dup.__split_vma.do_vmi_align_munmap
> > 0.25 ±100% +1.0 1.24 ± 2% perf-profile.calltrace.cycles-pp.mtree_range_walk.mas_walk.mas_find.__do_sys_brk.do_syscall_64
> > 0.75 +1.0 1.74 perf-profile.calltrace.cycles-pp.mas_walk.mas_find.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> > 0.55 +1.0 1.57 ± 2% perf-profile.calltrace.cycles-pp.__call_rcu_common.do_vmi_align_munmap.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> > 1.13 ± 2% +1.1 2.18 perf-profile.calltrace.cycles-pp.perf_event_mmap_output.perf_iterate_sb.perf_event_mmap_event.perf_event_mmap.do_brk_flags
> > 0.95 +1.1 2.03 perf-profile.calltrace.cycles-pp.mas_find.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> > 1.30 ± 2% +1.2 2.49 perf-profile.calltrace.cycles-pp.unmap_page_range.unmap_vmas.unmap_region.do_vmi_align_munmap.__do_sys_brk
> > 0.00 +1.3 1.28 perf-profile.calltrace.cycles-pp.kmem_cache_alloc.mas_alloc_nodes.mas_wr_node_store.mas_wr_store_entry.mas_store_gfp
> > 1.50 +1.4 2.90 perf-profile.calltrace.cycles-pp.__entry_text_start.brk
> > 1.62 +1.5 3.08 perf-profile.calltrace.cycles-pp.perf_iterate_sb.perf_event_mmap_event.perf_event_mmap.do_brk_flags.__do_sys_brk
> > 1.78 +1.5 3.28 perf-profile.calltrace.cycles-pp.unmap_vmas.unmap_region.do_vmi_align_munmap.__do_sys_brk.do_syscall_64
> > 0.00 +1.5 1.52 ± 2% perf-profile.calltrace.cycles-pp.__call_rcu_common.mas_wr_node_store.mas_wr_store_entry.mas_store_gfp.do_vmi_align_munmap
> > 0.00 +1.5 1.52 perf-profile.calltrace.cycles-pp.mas_alloc_nodes.mas_wr_node_store.mas_wr_store_entry.mas_store_gfp.do_vmi_align_munmap
> > 0.00 +1.5 1.53 perf-profile.calltrace.cycles-pp.__call_rcu_common.mas_wr_node_store.mas_wr_store_entry.mas_store_prealloc.vma_complete
> > 0.00 +1.7 1.74 perf-profile.calltrace.cycles-pp.mas_wr_store_entry.mas_store_prealloc.do_brk_flags.__do_sys_brk.do_syscall_64
> > 0.00 +1.9 1.90 perf-profile.calltrace.cycles-pp.entry_SYSCALL_64_safe_stack.brk
> > 2.35 +2.2 4.51 perf-profile.calltrace.cycles-pp.perf_event_mmap_event.perf_event_mmap.do_brk_flags.__do_sys_brk.do_syscall_64
> > 2.30 +2.4 4.65 perf-profile.calltrace.cycles-pp.kmem_cache_alloc.vm_area_dup.__split_vma.do_vmi_align_munmap.__do_sys_brk
> > 2.62 +2.5 5.10 perf-profile.calltrace.cycles-pp.perf_event_mmap.do_brk_flags.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> > 3.12 +2.6 5.70 perf-profile.calltrace.cycles-pp.unmap_region.do_vmi_align_munmap.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> > 2.74 +2.8 5.53 perf-profile.calltrace.cycles-pp.vm_area_dup.__split_vma.do_vmi_align_munmap.__do_sys_brk.do_syscall_64
> > 4.28 ± 3% +2.9 7.16 ± 4% perf-profile.calltrace.cycles-pp._raw_spin_lock_irqsave.free_pcppages_bulk.free_unref_page_commit.free_unref_page.__unfreeze_partials
> > 4.38 ± 3% +2.9 7.31 ± 4% perf-profile.calltrace.cycles-pp.free_pcppages_bulk.free_unref_page_commit.free_unref_page.__unfreeze_partials.rcu_do_batch
> > 4.41 ± 3% +2.9 7.35 ± 4% perf-profile.calltrace.cycles-pp.free_unref_page_commit.free_unref_page.__unfreeze_partials.rcu_do_batch.rcu_core
> > 4.43 ± 3% +3.0 7.38 ± 4% perf-profile.calltrace.cycles-pp.free_unref_page.__unfreeze_partials.rcu_do_batch.rcu_core.__do_softirq
> > 3.44 +3.5 6.99 perf-profile.calltrace.cycles-pp.syscall_exit_to_user_mode.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> > 3.91 +3.8 7.74 perf-profile.calltrace.cycles-pp.syscall_return_via_sysret.brk
> > 4.63 +4.3 8.91 perf-profile.calltrace.cycles-pp.mas_store_gfp.do_vmi_align_munmap.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe
> > 83.68 +4.7 88.36 perf-profile.calltrace.cycles-pp.brk
> > 0.00 +4.8 4.76 perf-profile.calltrace.cycles-pp.mas_wr_node_store.mas_wr_store_entry.mas_store_prealloc.vma_complete.__split_vma
> > 0.00 +5.5 5.54 perf-profile.calltrace.cycles-pp.mas_wr_store_entry.mas_store_prealloc.vma_complete.__split_vma.do_vmi_align_munmap
> > 32.01 +6.3 38.28 perf-profile.calltrace.cycles-pp.do_vmi_align_munmap.__do_sys_brk.do_syscall_64.entry_SYSCALL_64_after_hwframe.brk
> > 0.00 +6.4 6.35 perf-profile.calltrace.cycles-pp.mas_wr_node_store.mas_wr_store_entry.mas_store_gfp.do_vmi_align_munmap.__do_sys_brk
> > 0.82 +6.7 7.53 perf-profile.calltrace.cycles-pp.mas_wr_store_entry.mas_store_gfp.do_vmi_align_munmap.__do_sys_brk.do_syscall_64
> > 29.25 -20.1 9.14 perf-profile.children.cycles-pp.mas_store_prealloc
> > 33.60 -18.9 14.67 perf-profile.children.cycles-pp.do_brk_flags
> > 27.84 -17.3 10.50 ± 2% perf-profile.children.cycles-pp._raw_spin_lock_irqsave
> > 27.53 -17.1 10.38 ± 2% perf-profile.children.cycles-pp.native_queued_spin_lock_slowpath
> > 13.75 -13.7 0.00 perf-profile.children.cycles-pp.mas_wr_bnode
> > 13.22 -13.2 0.00 perf-profile.children.cycles-pp.kmem_cache_alloc_bulk
> > 12.52 -12.5 0.00 perf-profile.children.cycles-pp.__kmem_cache_alloc_bulk
> > 15.06 -10.7 4.36 perf-profile.children.cycles-pp.mas_alloc_nodes
> > 15.78 -10.5 5.29 perf-profile.children.cycles-pp.mas_preallocate
> > 10.28 -10.3 0.00 perf-profile.children.cycles-pp.mas_wr_spanning_store
> > 12.34 -9.9 2.40 perf-profile.children.cycles-pp.___slab_alloc
> > 9.30 -9.2 0.09 ± 4% perf-profile.children.cycles-pp.get_partial_node
> > 69.68 -9.1 60.59 perf-profile.children.cycles-pp.__do_sys_brk
> > 8.99 -9.0 0.00 perf-profile.children.cycles-pp.mas_split
> > 27.56 -8.0 19.53 perf-profile.children.cycles-pp.rcu_do_batch
> > 27.59 -8.0 19.56 perf-profile.children.cycles-pp.__do_softirq
> > 27.58 -8.0 19.55 perf-profile.children.cycles-pp.rcu_core
> > 7.37 -7.4 0.00 perf-profile.children.cycles-pp.mas_spanning_rebalance
> > 7.54 -6.5 1.02 perf-profile.children.cycles-pp.mas_destroy
> > 5.92 -5.9 0.00 perf-profile.children.cycles-pp.mas_topiary_replace
> > 12.39 -5.8 6.61 perf-profile.children.cycles-pp.vma_complete
> > 15.46 -5.0 10.49 ± 4% perf-profile.children.cycles-pp.smpboot_thread_fn
> > 15.44 -5.0 10.48 ± 4% perf-profile.children.cycles-pp.run_ksoftirqd
> > 15.47 -5.0 10.50 ± 4% perf-profile.children.cycles-pp.ret_from_fork_asm
> > 15.47 -5.0 10.50 ± 4% perf-profile.children.cycles-pp.ret_from_fork
> > 15.47 -5.0 10.50 ± 4% perf-profile.children.cycles-pp.kthread
> > 8.32 -4.6 3.78 ± 2% perf-profile.children.cycles-pp.__slab_free
> > 74.27 -4.5 69.76 perf-profile.children.cycles-pp.do_syscall_64
> > 15.32 -4.2 11.08 ± 2% perf-profile.children.cycles-pp.__unfreeze_partials
> > 20.53 -3.3 17.27 perf-profile.children.cycles-pp.__split_vma
> > 12.15 ± 2% -3.1 9.09 ± 3% perf-profile.children.cycles-pp.irq_exit_rcu
> > 12.47 ± 2% -3.0 9.42 ± 3% perf-profile.children.cycles-pp.sysvec_apic_timer_interrupt
> > 12.50 ± 2% -3.0 9.46 ± 3% perf-profile.children.cycles-pp.asm_sysvec_apic_timer_interrupt
> > 76.50 -2.3 74.18 perf-profile.children.cycles-pp.entry_SYSCALL_64_after_hwframe
> > 1.91 ± 4% -1.8 0.16 ± 3% perf-profile.children.cycles-pp.get_any_partial
> > 1.09 -0.9 0.14 ± 2% perf-profile.children.cycles-pp.memcpy_orig
> > 1.72 -0.7 1.05 perf-profile.children.cycles-pp.mas_pop_node
> > 1.14 -0.2 0.98 ± 2% perf-profile.children.cycles-pp.mas_prev_slot
> > 1.71 ± 2% -0.1 1.57 ± 4% perf-profile.children.cycles-pp.rcu_cblist_dequeue
> > 1.10 -0.1 0.98 perf-profile.children.cycles-pp.mas_next_slot
> > 0.32 ± 2% -0.1 0.22 ± 3% perf-profile.children.cycles-pp.inc_slabs_node
> > 0.60 ± 2% -0.1 0.52 perf-profile.children.cycles-pp.rcu_segcblist_enqueue
> > 0.48 ± 2% -0.1 0.40 ± 2% perf-profile.children.cycles-pp.rcu_nocb_try_bypass
> > 0.47 ± 2% -0.1 0.40 perf-profile.children.cycles-pp.alloc_pages_mpol
> > 0.38 ± 3% -0.1 0.31 ± 2% perf-profile.children.cycles-pp.get_page_from_freelist
> > 0.18 ± 2% -0.1 0.11 perf-profile.children.cycles-pp.__list_del_entry_valid_or_report
> > 0.44 ± 3% -0.1 0.37 perf-profile.children.cycles-pp.__alloc_pages
> > 0.27 ± 2% -0.1 0.22 ± 4% perf-profile.children.cycles-pp.mt_free_rcu
> > 0.25 ± 3% -0.1 0.20 ± 3% perf-profile.children.cycles-pp.rmqueue
> > 0.20 ± 6% -0.0 0.16 ± 3% perf-profile.children.cycles-pp.__rmqueue_pcplist
> > 0.15 ± 3% -0.0 0.11 ± 5% perf-profile.children.cycles-pp.discard_slab
> > 0.16 ± 4% -0.0 0.12 ± 3% perf-profile.children.cycles-pp.rmqueue_bulk
> > 0.08 ± 5% -0.0 0.06 perf-profile.children.cycles-pp.__list_add_valid_or_report
> > 0.24 ± 2% -0.0 0.22 ± 2% perf-profile.children.cycles-pp.__free_one_page
> > 0.19 ± 2% +0.0 0.21 ± 3% perf-profile.children.cycles-pp.update_process_times
> > 0.44 ± 2% +0.0 0.46 ± 4% perf-profile.children.cycles-pp.setup_object
> > 1.00 +0.0 1.03 perf-profile.children.cycles-pp.shuffle_freelist
> > 0.20 ± 3% +0.0 0.24 ± 4% perf-profile.children.cycles-pp.should_failslab
> > 0.09 ± 4% +0.0 0.14 ± 3% perf-profile.children.cycles-pp.strlen
> > 0.06 +0.0 0.11 ± 4% perf-profile.children.cycles-pp.__kmalloc_node
> > 0.06 ± 8% +0.0 0.10 ± 4% perf-profile.children.cycles-pp.__init_rwsem
> > 0.05 +0.0 0.10 ± 3% perf-profile.children.cycles-pp.__kmem_cache_alloc_node
> > 0.00 +0.1 0.05 perf-profile.children.cycles-pp.memcg_account_kmem
> > 0.00 +0.1 0.05 perf-profile.children.cycles-pp.testcase
> > 0.06 +0.1 0.11 ± 4% perf-profile.children.cycles-pp.memcg_alloc_slab_cgroups
> > 0.05 ± 7% +0.1 0.10 ± 4% perf-profile.children.cycles-pp.__pte_offset_map
> > 0.00 +0.1 0.05 ± 8% perf-profile.children.cycles-pp.flush_tlb_batched_pending
> > 0.00 +0.1 0.06 ± 8% perf-profile.children.cycles-pp.__free_slab
> > 0.02 ±141% +0.1 0.08 ± 18% perf-profile.children.cycles-pp.machine__process_mmap2_event
> > 0.07 ± 13% +0.1 0.13 ± 5% perf-profile.children.cycles-pp.may_expand_vm
> > 0.05 ± 50% +0.1 0.11 ± 18% perf-profile.children.cycles-pp.perf_session__process_user_event
> > 0.05 ± 50% +0.1 0.11 ± 18% perf-profile.children.cycles-pp.__ordered_events__flush
> > 0.00 +0.1 0.06 ± 6% perf-profile.children.cycles-pp.memset_orig
> > 0.12 ± 3% +0.1 0.18 ± 2% perf-profile.children.cycles-pp.anon_vma_clone
> > 0.08 ± 4% +0.1 0.14 ± 3% perf-profile.children.cycles-pp.vma_dup_policy
> > 0.07 ± 6% +0.1 0.14 ± 2% perf-profile.children.cycles-pp.free_pgd_range
> > 0.03 ±100% +0.1 0.10 ± 20% perf-profile.children.cycles-pp.perf_session__deliver_event
> > 0.00 +0.1 0.06 ± 7% perf-profile.children.cycles-pp.mas_prev
> > 0.11 ± 3% +0.1 0.18 ± 2% perf-profile.children.cycles-pp.mas_node_count_gfp
> > 0.01 ±223% +0.1 0.08 perf-profile.children.cycles-pp.tlb_batch_pages_flush
> > 0.11 ± 6% +0.1 0.18 ± 2% perf-profile.children.cycles-pp.unmap_single_vma
> > 1.17 +0.1 1.24 ± 2% perf-profile.children.cycles-pp.mtree_range_walk
> > 0.09 ± 5% +0.1 0.17 ± 2% perf-profile.children.cycles-pp.up_read
> > 0.02 ±141% +0.1 0.10 ± 6% perf-profile.children.cycles-pp.vma_prepare
> > 0.06 ± 6% +0.1 0.14 ± 3% perf-profile.children.cycles-pp.can_vma_merge_after
> > 0.10 ± 10% +0.1 0.19 ± 6% perf-profile.children.cycles-pp.kfree
> > 0.08 ± 6% +0.1 0.16 ± 3% perf-profile.children.cycles-pp.strnlen
> > 0.10 ± 4% +0.1 0.20 ± 2% perf-profile.children.cycles-pp.lru_add_drain_cpu
> > 0.18 ± 2% +0.1 0.27 perf-profile.children.cycles-pp.tlb_gather_mmu
> > 0.09 +0.1 0.19 ± 2% perf-profile.children.cycles-pp.refill_obj_stock
> > 0.00 +0.1 0.10 ± 4% perf-profile.children.cycles-pp.mlock_drain_local
> > 0.10 ± 5% +0.1 0.20 ± 2% perf-profile.children.cycles-pp.unlink_anon_vmas
> > 0.11 ± 4% +0.1 0.21 ± 3% perf-profile.children.cycles-pp.khugepaged_enter_vma
> > 0.10 ± 5% +0.1 0.20 perf-profile.children.cycles-pp.current_obj_cgroup
> > 0.10 ± 6% +0.1 0.20 ± 2% perf-profile.children.cycles-pp.syscall_exit_to_user_mode_prepare
> > 0.12 ± 5% +0.1 0.23 ± 3% perf-profile.children.cycles-pp._raw_spin_lock
> > 0.14 ± 4% +0.1 0.26 perf-profile.children.cycles-pp.cap_mmap_addr
> > 0.15 ± 6% +0.1 0.27 perf-profile.children.cycles-pp.exit_to_user_mode_prepare
> > 0.10 ± 3% +0.1 0.23 perf-profile.children.cycles-pp.downgrade_write
> > 0.14 ± 3% +0.1 0.28 perf-profile.children.cycles-pp.remove_vma
> > 2.56 +0.1 2.70 perf-profile.children.cycles-pp.kmem_cache_free
> > 0.00 +0.1 0.14 ± 2% perf-profile.children.cycles-pp.mas_is_err
> > 0.14 ± 3% +0.1 0.28 perf-profile.children.cycles-pp.lru_add_drain
> > 0.08 ± 5% +0.1 0.22 ± 2% perf-profile.children.cycles-pp.__vm_enough_memory
> > 0.15 ± 3% +0.1 0.30 ± 2% perf-profile.children.cycles-pp.__x64_sys_brk
> > 0.15 ± 3% +0.1 0.30 ± 2% perf-profile.children.cycles-pp.vma_adjust_trans_huge
> > 0.22 ± 2% +0.2 0.38 ± 3% perf-profile.children.cycles-pp.rcu_all_qs
> > 0.06 +0.2 0.24 ± 2% perf-profile.children.cycles-pp.mas_prev_range
> > 0.16 ± 4% +0.2 0.35 perf-profile.children.cycles-pp.mas_wr_store_setup
> > 0.24 ± 3% +0.2 0.42 perf-profile.children.cycles-pp.tlb_finish_mmu
> > 0.22 ± 3% +0.2 0.41 perf-profile.children.cycles-pp.security_mmap_addr
> > 0.20 ± 3% +0.2 0.39 ± 2% perf-profile.children.cycles-pp.cap_vm_enough_memory
> > 0.17 ± 5% +0.2 0.36 ± 2% perf-profile.children.cycles-pp.percpu_counter_add_batch
> > 0.14 ± 6% +0.2 0.34 ± 2% perf-profile.children.cycles-pp.strscpy
> > 0.01 ±223% +0.2 0.24 perf-profile.children.cycles-pp.mas_wr_append
> > 0.19 ± 4% +0.2 0.43 ± 2% perf-profile.children.cycles-pp.mas_nomem
> > 0.25 +0.2 0.50 ± 2% perf-profile.children.cycles-pp.security_vm_enough_memory_mm
> > 0.26 +0.3 0.51 ± 2% perf-profile.children.cycles-pp.entry_SYSRETQ_unsafe_stack
> > 0.27 ± 2% +0.3 0.53 ± 2% perf-profile.children.cycles-pp.__pte_offset_map_lock
> > 0.27 ± 2% +0.3 0.56 perf-profile.children.cycles-pp.arch_get_unmapped_area_topdown
> > 0.35 ± 2% +0.3 0.68 perf-profile.children.cycles-pp.obj_cgroup_charge
> > 0.36 ± 2% +0.4 0.72 ± 2% perf-profile.children.cycles-pp.mod_objcg_state
> > 0.39 ± 3% +0.4 0.78 perf-profile.children.cycles-pp.up_write
> > 0.44 ± 2% +0.4 0.85 ± 2% perf-profile.children.cycles-pp.free_pgtables
> > 0.35 +0.4 0.77 perf-profile.children.cycles-pp.userfaultfd_unmap_complete
> > 0.38 ± 2% +0.4 0.81 perf-profile.children.cycles-pp.down_write_killable
> > 0.56 +0.4 1.01 ± 2% perf-profile.children.cycles-pp.down_write
> > 0.53 ± 2% +0.5 1.00 perf-profile.children.cycles-pp.zap_pte_range
> > 0.31 ± 2% +0.5 0.82 perf-profile.children.cycles-pp.mas_wr_end_piv
> > 0.56 +0.5 1.10 perf-profile.children.cycles-pp.mas_leaf_max_gap
> > 0.89 +0.6 1.45 perf-profile.children.cycles-pp.__cond_resched
> > 0.64 ± 2% +0.6 1.20 perf-profile.children.cycles-pp.get_unmapped_area
> > 0.72 ± 2% +0.6 1.32 ± 4% perf-profile.children.cycles-pp.syscall_enter_from_user_mode
> > 0.48 ± 2% +0.6 1.08 perf-profile.children.cycles-pp.entry_SYSCALL_64_safe_stack
> > 0.73 ± 2% +0.6 1.37 perf-profile.children.cycles-pp.check_brk_limits
> > 0.77 ± 2% +0.7 1.50 perf-profile.children.cycles-pp.zap_pmd_range
> > 0.94 +0.8 1.77 perf-profile.children.cycles-pp.memcg_slab_post_alloc_hook
> > 0.68 +0.8 1.52 perf-profile.children.cycles-pp.mas_wr_walk
> > 0.00 +0.9 0.90 perf-profile.children.cycles-pp.mas_wr_slot_store
> > 1.22 +0.9 2.17 perf-profile.children.cycles-pp.vm_area_free_rcu_cb
> > 1.14 ± 2% +1.1 2.20 perf-profile.children.cycles-pp.perf_event_mmap_output
> > 0.91 +1.1 2.02 perf-profile.children.cycles-pp.mas_walk
> > 1.32 +1.2 2.54 perf-profile.children.cycles-pp.unmap_page_range
> > 3.44 +1.3 4.69 perf-profile.children.cycles-pp.__call_rcu_common
> > 0.33 ± 4% +1.4 1.74 perf-profile.children.cycles-pp.mas_update_gap
> > 1.63 +1.5 3.10 perf-profile.children.cycles-pp.perf_iterate_sb
> > 1.79 +1.5 3.30 perf-profile.children.cycles-pp.unmap_vmas
> > 1.60 +1.6 3.19 perf-profile.children.cycles-pp.mas_find
> > 1.85 +1.9 3.73 perf-profile.children.cycles-pp.__entry_text_start
> > 2.39 +2.2 4.60 perf-profile.children.cycles-pp.perf_event_mmap_event
> > 2.62 +2.5 5.12 perf-profile.children.cycles-pp.perf_event_mmap
> > 3.15 +2.6 5.79 perf-profile.children.cycles-pp.unmap_region
> > 2.75 +2.8 5.55 perf-profile.children.cycles-pp.vm_area_dup
> > 3.46 +3.6 7.04 perf-profile.children.cycles-pp.syscall_exit_to_user_mode
> > 3.94 +3.9 7.80 perf-profile.children.cycles-pp.syscall_return_via_sysret
> > 4.68 +4.3 9.03 perf-profile.children.cycles-pp.mas_store_gfp
> > 3.74 +4.7 8.40 perf-profile.children.cycles-pp.kmem_cache_alloc
> > 83.90 +4.9 88.80 perf-profile.children.cycles-pp.brk
> > 32.12 +6.4 38.51 perf-profile.children.cycles-pp.do_vmi_align_munmap
> > 0.24 ± 2% +11.0 11.20 perf-profile.children.cycles-pp.mas_wr_node_store
> > 1.38 +13.6 14.95 perf-profile.children.cycles-pp.mas_wr_store_entry
> > 27.53 -17.1 10.38 ± 2% perf-profile.self.cycles-pp.native_queued_spin_lock_slowpath
> > 4.60 -0.8 3.76 ± 2% perf-profile.self.cycles-pp.__slab_free
> > 0.94 -0.8 0.12 ± 4% perf-profile.self.cycles-pp.memcpy_orig
> > 1.52 -0.6 0.94 perf-profile.self.cycles-pp.mas_pop_node
> > 0.79 -0.5 0.30 perf-profile.self.cycles-pp.___slab_alloc
> > 0.31 -0.2 0.12 ± 3% perf-profile.self.cycles-pp._raw_spin_lock_irqsave
> > 0.28 ± 3% -0.2 0.09 ± 5% perf-profile.self.cycles-pp.__unfreeze_partials
> > 1.68 ± 2% -0.1 1.55 ± 5% perf-profile.self.cycles-pp.rcu_cblist_dequeue
> > 2.14 -0.1 2.02 perf-profile.self.cycles-pp.kmem_cache_free
> > 0.37 ± 2% -0.1 0.28 perf-profile.self.cycles-pp.rcu_nocb_try_bypass
> > 0.30 ± 2% -0.1 0.22 ± 3% perf-profile.self.cycles-pp.inc_slabs_node
> > 0.52 ± 2% -0.1 0.46 ± 2% perf-profile.self.cycles-pp.rcu_segcblist_enqueue
> > 0.17 ± 2% -0.1 0.10 ± 4% perf-profile.self.cycles-pp.__list_del_entry_valid_or_report
> > 0.26 -0.0 0.21 ± 4% perf-profile.self.cycles-pp.mt_free_rcu
> > 0.15 ± 3% -0.0 0.11 ± 3% perf-profile.self.cycles-pp.discard_slab
> > 0.17 ± 2% -0.0 0.14 ± 2% perf-profile.self.cycles-pp.get_any_partial
> > 0.08 ± 5% -0.0 0.06 perf-profile.self.cycles-pp.__list_add_valid_or_report
> > 0.15 ± 3% -0.0 0.13 ± 3% perf-profile.self.cycles-pp.__free_one_page
> > 0.10 ± 3% +0.0 0.12 ± 4% perf-profile.self.cycles-pp.rcu_segcblist_pend_cbs
> > 0.08 ± 10% +0.0 0.10 ± 4% perf-profile.self.cycles-pp.should_failslab
> > 0.08 +0.0 0.12 ± 3% perf-profile.self.cycles-pp.strlen
> > 0.06 +0.0 0.10 ± 6% perf-profile.self.cycles-pp.vma_dup_policy
> > 0.08 +0.0 0.12 ± 3% perf-profile.self.cycles-pp.anon_vma_clone
> > 0.06 ± 9% +0.0 0.10 ± 6% perf-profile.self.cycles-pp.may_expand_vm
> > 0.00 +0.1 0.05 perf-profile.self.cycles-pp.mas_prev
> > 0.03 ± 70% +0.1 0.08 ± 5% perf-profile.self.cycles-pp.__init_rwsem
> > 0.09 ± 8% +0.1 0.14 ± 4% perf-profile.self.cycles-pp.kfree
> > 0.00 +0.1 0.06 ± 6% perf-profile.self.cycles-pp.__vm_enough_memory
> > 0.07 ± 6% +0.1 0.13 ± 2% perf-profile.self.cycles-pp.mas_node_count_gfp
> > 0.03 ± 70% +0.1 0.09 ± 7% perf-profile.self.cycles-pp.security_vm_enough_memory_mm
> > 0.15 ± 3% +0.1 0.21 ± 11% perf-profile.self.cycles-pp.setup_object
> > 0.00 +0.1 0.06 perf-profile.self.cycles-pp.memset_orig
> > 0.07 ± 5% +0.1 0.13 ± 3% perf-profile.self.cycles-pp.security_mmap_addr
> > 0.00 +0.1 0.06 ± 6% perf-profile.self.cycles-pp.tlb_batch_pages_flush
> > 0.06 ± 7% +0.1 0.13 ± 3% perf-profile.self.cycles-pp.free_pgd_range
> > 0.08 +0.1 0.15 ± 2% perf-profile.self.cycles-pp.check_brk_limits
> > 0.08 ± 6% +0.1 0.14 ± 3% perf-profile.self.cycles-pp.khugepaged_enter_vma
> > 0.09 ± 4% +0.1 0.17 ± 2% perf-profile.self.cycles-pp.unmap_single_vma
> > 0.00 +0.1 0.08 ± 6% perf-profile.self.cycles-pp.vma_prepare
> > 0.07 ± 5% +0.1 0.15 ± 4% perf-profile.self.cycles-pp.up_read
> > 0.06 ± 7% +0.1 0.14 ± 5% perf-profile.self.cycles-pp.strnlen
> > 0.16 ± 2% +0.1 0.24 perf-profile.self.cycles-pp.tlb_gather_mmu
> > 0.07 +0.1 0.15 ± 3% perf-profile.self.cycles-pp.unlink_anon_vmas
> > 0.09 ± 6% +0.1 0.17 perf-profile.self.cycles-pp.lru_add_drain_cpu
> > 0.00 +0.1 0.08 perf-profile.self.cycles-pp.mlock_drain_local
> > 0.04 ± 44% +0.1 0.12 ± 3% perf-profile.self.cycles-pp.can_vma_merge_after
> > 0.14 ± 2% +0.1 0.22 ± 3% perf-profile.self.cycles-pp.get_unmapped_area
> > 0.01 ±223% +0.1 0.09 ± 5% perf-profile.self.cycles-pp.__pte_offset_map
> > 0.06 ± 7% +0.1 0.15 ± 3% perf-profile.self.cycles-pp.remove_vma
> > 0.08 ± 4% +0.1 0.17 ± 3% perf-profile.self.cycles-pp.syscall_exit_to_user_mode_prepare
> > 0.09 +0.1 0.18 ± 3% perf-profile.self.cycles-pp.refill_obj_stock
> > 0.08 ± 4% +0.1 0.17 ± 3% perf-profile.self.cycles-pp.current_obj_cgroup
> > 0.09 ± 4% +0.1 0.18 ± 2% perf-profile.self.cycles-pp.__pte_offset_map_lock
> > 0.00 +0.1 0.10 ± 4% perf-profile.self.cycles-pp.mas_is_err
> > 0.09 ± 6% +0.1 0.19 ± 3% perf-profile.self.cycles-pp.mas_nomem
> > 0.11 ± 4% +0.1 0.21 ± 4% perf-profile.self.cycles-pp._raw_spin_lock
> > 0.24 ± 2% +0.1 0.35 perf-profile.self.cycles-pp.mas_destroy
> > 0.12 ± 3% +0.1 0.23 ± 2% perf-profile.self.cycles-pp.cap_mmap_addr
> > 1.02 +0.1 1.13 perf-profile.self.cycles-pp.mtree_range_walk
> > 0.15 ± 4% +0.1 0.26 ± 4% perf-profile.self.cycles-pp.rcu_all_qs
> > 0.12 ± 6% +0.1 0.22 ± 2% perf-profile.self.cycles-pp.exit_to_user_mode_prepare
> > 0.09 +0.1 0.20 ± 2% perf-profile.self.cycles-pp.downgrade_write
> > 0.13 +0.1 0.25 ± 2% perf-profile.self.cycles-pp.__x64_sys_brk
> > 0.22 ± 2% +0.1 0.34 ± 2% perf-profile.self.cycles-pp.unmap_vmas
> > 0.13 ± 3% +0.1 0.26 ± 2% perf-profile.self.cycles-pp.vma_adjust_trans_huge
> > 0.12 ± 4% +0.1 0.25 ± 2% perf-profile.self.cycles-pp.entry_SYSCALL_64_safe_stack
> > 0.16 ± 3% +0.1 0.30 perf-profile.self.cycles-pp.tlb_finish_mmu
> > 0.12 ± 4% +0.1 0.26 ± 2% perf-profile.self.cycles-pp.mas_wr_store_setup
> > 0.14 ± 4% +0.2 0.29 ± 2% perf-profile.self.cycles-pp.syscall_enter_from_user_mode
> > 0.14 ± 2% +0.2 0.31 perf-profile.self.cycles-pp.free_pgtables
> > 0.12 ± 4% +0.2 0.28 perf-profile.self.cycles-pp.strscpy
> > 0.00 +0.2 0.17 ± 4% perf-profile.self.cycles-pp.mas_prev_range
> > 0.14 ± 4% +0.2 0.31 ± 2% perf-profile.self.cycles-pp.percpu_counter_add_batch
> > 0.18 ± 2% +0.2 0.35 perf-profile.self.cycles-pp.cap_vm_enough_memory
> > 0.18 ± 3% +0.2 0.36 ± 2% perf-profile.self.cycles-pp.zap_pte_range
> > 0.15 ± 3% +0.2 0.33 ± 2% perf-profile.self.cycles-pp.zap_pmd_range
> > 0.27 +0.2 0.47 perf-profile.self.cycles-pp.unmap_region
> > 0.00 +0.2 0.20 ± 2% perf-profile.self.cycles-pp.mas_wr_append
> > 0.00 +0.2 0.20 ± 3% perf-profile.self.cycles-pp.mas_wr_slot_store
> > 0.18 ± 2% +0.2 0.39 perf-profile.self.cycles-pp.vma_complete
> > 0.34 ± 5% +0.2 0.55 ± 3% perf-profile.self.cycles-pp.vm_area_free_rcu_cb
> > 0.22 ± 2% +0.2 0.44 ± 2% perf-profile.self.cycles-pp.entry_SYSRETQ_unsafe_stack
> > 0.45 ± 2% +0.2 0.68 perf-profile.self.cycles-pp.mas_alloc_nodes
> > 0.20 ± 2% +0.2 0.43 ± 2% perf-profile.self.cycles-pp.down_write_killable
> > 0.20 ± 3% +0.2 0.44 perf-profile.self.cycles-pp.perf_event_mmap
> > 0.18 ± 3% +0.2 0.42 ± 2% perf-profile.self.cycles-pp.do_syscall_64
> > 0.24 +0.3 0.49 perf-profile.self.cycles-pp.arch_get_unmapped_area_topdown
> > 0.27 ± 3% +0.3 0.54 perf-profile.self.cycles-pp.obj_cgroup_charge
> > 0.36 ± 2% +0.3 0.66 ± 3% perf-profile.self.cycles-pp.down_write
> > 0.30 ± 2% +0.3 0.62 perf-profile.self.cycles-pp.vm_area_dup
> > 0.32 ± 2% +0.3 0.64 ± 2% perf-profile.self.cycles-pp.mod_objcg_state
> > 0.35 +0.3 0.68 perf-profile.self.cycles-pp.mas_walk
> > 0.34 ± 2% +0.3 0.68 perf-profile.self.cycles-pp.perf_event_mmap_event
> > 0.33 ± 2% +0.4 0.68 perf-profile.self.cycles-pp.up_write
> > 0.44 ± 2% +0.4 0.80 perf-profile.self.cycles-pp.perf_iterate_sb
> > 0.58 +0.4 0.94 ± 2% perf-profile.self.cycles-pp.__cond_resched
> > 0.30 ± 2% +0.4 0.68 perf-profile.self.cycles-pp.userfaultfd_unmap_complete
> > 0.51 +0.4 0.88 perf-profile.self.cycles-pp.mas_next_slot
> > 0.44 ± 2% +0.4 0.82 perf-profile.self.cycles-pp.unmap_page_range
> > 0.58 +0.4 0.96 perf-profile.self.cycles-pp.mas_find
> > 0.26 +0.4 0.68 perf-profile.self.cycles-pp.mas_wr_end_piv
> > 0.48 ± 2% +0.4 0.90 perf-profile.self.cycles-pp.brk
> > 0.45 +0.4 0.88 perf-profile.self.cycles-pp.mas_prev_slot
> > 0.49 +0.4 0.94 perf-profile.self.cycles-pp.mas_leaf_max_gap
> > 0.34 ± 2% +0.4 0.78 perf-profile.self.cycles-pp.mas_store_prealloc
> > 0.20 ± 3% +0.4 0.65 ± 2% perf-profile.self.cycles-pp.mas_update_gap
> > 0.41 ± 2% +0.5 0.92 perf-profile.self.cycles-pp.mas_store_gfp
> > 0.64 +0.6 1.23 perf-profile.self.cycles-pp.memcg_slab_post_alloc_hook
> > 0.59 ± 2% +0.6 1.22 perf-profile.self.cycles-pp.__split_vma
> > 0.44 ± 2% +0.7 1.10 perf-profile.self.cycles-pp.mas_wr_store_entry
> > 0.66 +0.7 1.35 perf-profile.self.cycles-pp.mas_preallocate
> > 0.59 +0.7 1.33 perf-profile.self.cycles-pp.do_brk_flags
> > 0.58 +0.7 1.32 perf-profile.self.cycles-pp.mas_wr_walk
> > 1.03 +0.8 1.81 perf-profile.self.cycles-pp.do_vmi_align_munmap
> > 0.78 +0.8 1.57 perf-profile.self.cycles-pp.__do_sys_brk
> > 1.79 +0.9 2.66 perf-profile.self.cycles-pp.__call_rcu_common
> > 1.02 +1.0 1.98 perf-profile.self.cycles-pp.perf_event_mmap_output
> > 1.33 +1.4 2.74 perf-profile.self.cycles-pp.kmem_cache_alloc
> > 1.64 +1.7 3.30 perf-profile.self.cycles-pp.__entry_text_start
> > 2.26 +2.2 4.50 perf-profile.self.cycles-pp.entry_SYSCALL_64_after_hwframe
> > 3.23 +3.3 6.58 perf-profile.self.cycles-pp.syscall_exit_to_user_mode
> > 0.21 ± 2% +3.6 3.82 perf-profile.self.cycles-pp.mas_wr_node_store
> > 3.93 +3.9 7.78 perf-profile.self.cycles-pp.syscall_return_via_sysret
> >
> >
> >
> >
> > 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.
> >
> >
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