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Message-ID: <20201207131037.GA3826@xsang-OptiPlex-9020>
Date: Mon, 7 Dec 2020 21:10:37 +0800
From: Oliver Sang <oliver.sang@...el.com>
To: David Howells <dhowells@...hat.com>
Cc: lkp@...ts.01.org, lkp@...el.com, ying.huang@...el.com,
feng.tang@...el.com, zhengjun.xing@...el.com,
Pavel Begunkov <asml.silence@...il.com>,
Matthew Wilcox <willy@...radead.org>,
Jens Axboe <axboe@...nel.dk>,
Alexander Viro <viro@...iv.linux.org.uk>,
Linus Torvalds <torvalds@...ux-foundation.org>,
linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: Re: [iov_iter] 9bd0e337c6: will-it-scale.per_process_ops -4.8%
regression
Hi David,
On Fri, Dec 04, 2020 at 11:51:48AM +0000, David Howells wrote:
> kernel test robot <oliver.sang@...el.com> wrote:
>
> > FYI, we noticed a -4.8% regression of will-it-scale.per_process_ops due to commit:
> >
> >
> > commit: 9bd0e337c633aed3e8ec3c7397b7ae0b8436f163 ("[PATCH 01/29] iov_iter: Switch to using a table of operations")
>
> Out of interest, would it be possible for you to run this on the tail of the
> series on the same hardware?
sorry for late. below is the result adding the tail of the series:
* ded69a6991fe0 (linux-review/David-Howells/RFC-iov_iter-Switch-to-using-an-ops-table/20201121-222344) iov_iter: Remove iterate_all_kinds() and iterate_and_advance()
=========================================================================================
compiler/cpufreq_governor/kconfig/mode/nr_task/rootfs/tbox_group/test/testcase/ucode:
gcc-9/performance/x86_64-rhel-8.3/process/50%/debian-10.4-x86_64-20200603.cgz/lkp-ivb-2ep1/pwrite1/will-it-scale/0x42e
commit:
27bba9c532a8d21050b94224ffd310ad0058c353
9bd0e337c633aed3e8ec3c7397b7ae0b8436f163
ded69a6991fe0094f36d96bf1ace2a9636428676
27bba9c532a8d210 9bd0e337c633aed3e8ec3c7397b ded69a6991fe0094f36d96bf1ac
---------------- --------------------------- ---------------------------
%stddev %change %stddev %change %stddev
\ | \ | \
28443113 -4.8% 27064036 -4.8% 27084904 will-it-scale.24.processes
1185129 -4.8% 1127667 -4.8% 1128537 will-it-scale.per_process_ops
28443113 -4.8% 27064036 -4.8% 27084904 will-it-scale.workload
13.84 +1.0% 13.98 +0.3% 13.89 boot-time.dhcp
1251 ± 9% -17.2% 1035 ± 10% -9.1% 1137 ± 5% slabinfo.dmaengine-unmap-16.active_objs
1251 ± 9% -17.2% 1035 ± 10% -9.1% 1137 ± 5% slabinfo.dmaengine-unmap-16.num_objs
1052 ± 6% -1.1% 1041 ± 5% -13.4% 911.75 ± 10% slabinfo.task_group.active_objs
1052 ± 6% -1.1% 1041 ± 5% -13.4% 911.75 ± 10% slabinfo.task_group.num_objs
31902 ± 5% -5.6% 30124 ± 7% -8.3% 29265 ± 4% slabinfo.vm_area_struct.active_objs
32163 ± 5% -5.4% 30441 ± 6% -8.0% 29602 ± 4% slabinfo.vm_area_struct.num_objs
73.46 ± 48% -59.7% 29.59 ±100% -100.0% 0.00 sched_debug.cfs_rq:/.MIN_vruntime.avg
2386 ± 23% -40.5% 1420 ±100% -100.0% 0.00 sched_debug.cfs_rq:/.MIN_vruntime.max
393.92 ± 33% -48.5% 202.85 ±100% -100.0% 0.00 sched_debug.cfs_rq:/.MIN_vruntime.stddev
73.46 ± 48% -59.7% 29.60 ±100% -100.0% 0.00 sched_debug.cfs_rq:/.max_vruntime.avg
2386 ± 23% -40.5% 1420 ±100% -100.0% 0.00 sched_debug.cfs_rq:/.max_vruntime.max
393.92 ± 33% -48.5% 202.94 ±100% -100.0% 0.00 sched_debug.cfs_rq:/.max_vruntime.stddev
0.00 ± 9% -13.5% 0.00 ± 3% -2.9% 0.00 ± 13% sched_debug.cpu.next_balance.stddev
-18.50 +33.5% -24.70 -41.9% -10.75 sched_debug.cpu.nr_uninterruptible.min
411.75 ± 58% +76.8% 728.00 ± 32% +59.2% 655.50 ± 50% numa-vmstat.node0.nr_active_anon
34304 ± 2% -35.6% 22103 ± 48% +8.6% 37243 ± 26% numa-vmstat.node0.nr_anon_pages
36087 ± 2% -31.0% 24915 ± 43% +7.0% 38606 ± 27% numa-vmstat.node0.nr_inactive_anon
2233 ± 51% +60.4% 3582 ± 7% -7.7% 2062 ± 51% numa-vmstat.node0.nr_shmem
411.75 ± 58% +76.8% 728.00 ± 32% +59.2% 655.50 ± 50% numa-vmstat.node0.nr_zone_active_anon
36087 ± 2% -31.0% 24915 ± 43% +7.0% 38606 ± 27% numa-vmstat.node0.nr_zone_inactive_anon
24265 ± 3% +51.3% 36707 ± 29% -12.2% 21315 ± 47% numa-vmstat.node1.nr_anon_pages
25441 ± 2% +44.9% 36858 ± 29% -9.9% 22912 ± 47% numa-vmstat.node1.nr_inactive_anon
537.25 ± 20% +22.8% 659.50 ± 10% +14.5% 615.00 ± 21% numa-vmstat.node1.nr_page_table_pages
25441 ± 2% +44.9% 36858 ± 29% -9.9% 22912 ± 47% numa-vmstat.node1.nr_zone_inactive_anon
1649 ± 58% +76.7% 2913 ± 32% +59.0% 2621 ± 50% numa-meminfo.node0.Active
1649 ± 58% +76.7% 2913 ± 32% +59.0% 2621 ± 50% numa-meminfo.node0.Active(anon)
137223 ± 2% -35.6% 88410 ± 48% +8.6% 148973 ± 26% numa-meminfo.node0.AnonPages
164997 ± 9% -28.4% 118095 ± 42% +6.9% 176340 ± 23% numa-meminfo.node0.AnonPages.max
144353 ± 2% -31.0% 99656 ± 43% +7.0% 154424 ± 27% numa-meminfo.node0.Inactive
144353 ± 2% -31.0% 99656 ± 43% +7.0% 154424 ± 27% numa-meminfo.node0.Inactive(anon)
8937 ± 51% +60.3% 14328 ± 7% -7.7% 8251 ± 51% numa-meminfo.node0.Shmem
97072 ± 3% +51.3% 146858 ± 29% -12.2% 85274 ± 47% numa-meminfo.node1.AnonPages
127410 ± 5% +43.2% 182468 ± 16% -1.9% 124986 ± 42% numa-meminfo.node1.AnonPages.max
101822 ± 2% +44.9% 147521 ± 29% -9.9% 91738 ± 47% numa-meminfo.node1.Inactive
101822 ± 2% +44.9% 147521 ± 29% -9.9% 91738 ± 47% numa-meminfo.node1.Inactive(anon)
2148 ± 20% +22.9% 2639 ± 10% +14.5% 2460 ± 21% numa-meminfo.node1.PageTables
24623 ± 5% -18.0% 20184 ± 15% -6.9% 22929 ± 15% softirqs.CPU0.RCU
15977 ± 9% +34.4% 21477 ± 22% +54.7% 24711 ± 15% softirqs.CPU13.RCU
30680 ± 40% -56.2% 13431 ± 60% -70.8% 8966 ± 44% softirqs.CPU13.SCHED
28877 ± 10% -30.6% 20051 ± 15% -24.2% 21887 ± 13% softirqs.CPU19.RCU
5693 ± 31% +402.3% 28595 ± 22% +154.6% 14496 ± 46% softirqs.CPU19.SCHED
5753 ± 14% +141.4% 13886 ± 87% +172.2% 15657 ± 51% softirqs.CPU2.SCHED
7252 ± 79% +239.9% 24653 ± 48% +189.1% 20968 ± 44% softirqs.CPU23.SCHED
42479 -24.7% 31999 ± 39% -25.9% 31488 ± 27% softirqs.CPU26.SCHED
21142 ± 15% -26.5% 15533 ± 11% +5.6% 22317 ± 17% softirqs.CPU27.RCU
20776 ± 38% -50.5% 10290 ± 58% +4.7% 21748 ± 35% softirqs.CPU3.SCHED
26618 ± 11% -35.3% 17214 ± 6% -33.5% 17689 ± 5% softirqs.CPU37.RCU
10894 ± 48% +175.5% 30012 ± 34% +237.2% 36734 ± 10% softirqs.CPU37.SCHED
17015 ± 4% +39.2% 23681 ± 7% +9.9% 18707 ± 21% softirqs.CPU43.RCU
29682 ± 10% -17.6% 24446 ± 23% -18.9% 24062 ± 9% softirqs.CPU6.RCU
21953 ± 20% +9.7% 24079 ± 24% -18.3% 17943 ± 23% softirqs.CPU7.RCU
3431 ± 89% -85.1% 512.25 ±109% -93.6% 220.75 ± 32% interrupts.38:PCI-MSI.2621444-edge.eth0-TxRx-3
348.50 ± 62% +152.7% 880.75 ± 27% -30.1% 243.50 ± 44% interrupts.40:PCI-MSI.2621446-edge.eth0-TxRx-5
50948 -0.6% 50655 +7.1% 54590 ± 6% interrupts.CAL:Function_call_interrupts
2579 ± 26% +32.3% 3412 ± 43% +58.3% 4082 ± 27% interrupts.CPU0.NMI:Non-maskable_interrupts
2579 ± 26% +32.3% 3412 ± 43% +58.3% 4082 ± 27% interrupts.CPU0.PMI:Performance_monitoring_interrupts
296.75 -3.4% 286.75 ± 7% -38.2% 183.50 ± 40% interrupts.CPU1.RES:Rescheduling_interrupts
737.25 +8.7% 801.75 ± 13% +92.5% 1419 ± 73% interrupts.CPU11.CAL:Function_call_interrupts
1697 ± 63% -53.1% 796.75 ± 13% -55.7% 751.50 interrupts.CPU13.CAL:Function_call_interrupts
89.75 ± 36% +220.3% 287.50 ± 20% +195.3% 265.00 ± 10% interrupts.CPU13.RES:Rescheduling_interrupts
745.75 ± 3% +104.6% 1526 ± 69% +52.7% 1138 ± 61% interrupts.CPU19.CAL:Function_call_interrupts
293.00 ± 5% -60.0% 117.25 ± 47% -24.1% 222.25 ± 22% interrupts.CPU19.RES:Rescheduling_interrupts
778.50 ± 9% +123.7% 1741 ± 64% +3.3% 804.50 ± 10% interrupts.CPU22.CAL:Function_call_interrupts
670.00 ± 22% +40.2% 939.50 ± 49% +84.6% 1236 ± 63% interrupts.CPU23.CAL:Function_call_interrupts
283.50 ± 7% -47.7% 148.25 ± 64% -38.9% 173.25 ± 38% interrupts.CPU23.RES:Rescheduling_interrupts
6450 ± 29% -38.0% 4000 ± 4% +8.2% 6977 ± 29% interrupts.CPU24.NMI:Non-maskable_interrupts
6450 ± 29% -38.0% 4000 ± 4% +8.2% 6977 ± 29% interrupts.CPU24.PMI:Performance_monitoring_interrupts
2505 ± 24% +100.2% 5015 ± 45% +166.6% 6679 ± 26% interrupts.CPU25.NMI:Non-maskable_interrupts
2505 ± 24% +100.2% 5015 ± 45% +166.6% 6679 ± 26% interrupts.CPU25.PMI:Performance_monitoring_interrupts
2012 ± 56% -57.6% 852.75 ± 6% -48.0% 1047 ± 35% interrupts.CPU26.CAL:Function_call_interrupts
71.50 ± 12% +73.4% 124.00 ± 72% +106.3% 147.50 ± 49% interrupts.CPU26.RES:Rescheduling_interrupts
4198 ± 54% +5.7% 4438 ± 51% +41.8% 5952 ± 40% interrupts.CPU27.NMI:Non-maskable_interrupts
4198 ± 54% +5.7% 4438 ± 51% +41.8% 5952 ± 40% interrupts.CPU27.PMI:Performance_monitoring_interrupts
184.25 ± 37% -47.9% 96.00 ± 49% -6.5% 172.25 ± 27% interrupts.CPU27.RES:Rescheduling_interrupts
0.50 ±100% +64250.0% 321.75 ±170% +500.0% 3.00 ±115% interrupts.CPU28.TLB:TLB_shootdowns
3431 ± 89% -85.1% 512.25 ±109% -93.6% 220.75 ± 32% interrupts.CPU29.38:PCI-MSI.2621444-edge.eth0-TxRx-3
5982 ± 40% -21.5% 4695 ± 46% -35.1% 3881 ± 64% interrupts.CPU3.NMI:Non-maskable_interrupts
5982 ± 40% -21.5% 4695 ± 46% -35.1% 3881 ± 64% interrupts.CPU3.PMI:Performance_monitoring_interrupts
348.50 ± 62% +152.7% 880.75 ± 27% -30.1% 243.50 ± 44% interrupts.CPU31.40:PCI-MSI.2621446-edge.eth0-TxRx-5
156.50 ± 51% -51.3% 76.25 ± 59% +9.1% 170.75 ± 48% interrupts.CPU33.RES:Rescheduling_interrupts
883.50 ± 18% -23.8% 673.25 ± 22% -2.2% 863.75 ± 12% interrupts.CPU36.CAL:Function_call_interrupts
7492 ± 13% -45.6% 4073 ± 63% -40.2% 4483 ± 27% interrupts.CPU37.NMI:Non-maskable_interrupts
7492 ± 13% -45.6% 4073 ± 63% -40.2% 4483 ± 27% interrupts.CPU37.PMI:Performance_monitoring_interrupts
250.50 ± 19% -52.5% 119.00 ± 50% -76.0% 60.00 ± 49% interrupts.CPU37.RES:Rescheduling_interrupts
772.50 ± 2% +2.0% 787.75 ± 10% +346.2% 3447 ±127% interrupts.CPU40.CAL:Function_call_interrupts
4688 ± 27% +63.5% 7667 ± 15% +14.0% 5345 ± 38% interrupts.CPU40.NMI:Non-maskable_interrupts
4688 ± 27% +63.5% 7667 ± 15% +14.0% 5345 ± 38% interrupts.CPU40.PMI:Performance_monitoring_interrupts
96.75 ± 92% +135.1% 227.50 ± 22% +29.5% 125.25 ± 46% interrupts.CPU43.RES:Rescheduling_interrupts
2932 ± 36% +73.4% 5084 ± 21% +24.7% 3656 ± 55% interrupts.CPU47.NMI:Non-maskable_interrupts
2932 ± 36% +73.4% 5084 ± 21% +24.7% 3656 ± 55% interrupts.CPU47.PMI:Performance_monitoring_interrupts
57.50 ± 78% +250.4% 201.50 ± 42% +251.7% 202.25 ± 17% interrupts.CPU47.RES:Rescheduling_interrupts
4207 ± 61% +86.0% 7827 ± 11% +48.7% 6258 ± 33% interrupts.CPU8.NMI:Non-maskable_interrupts
4207 ± 61% +86.0% 7827 ± 11% +48.7% 6258 ± 33% interrupts.CPU8.PMI:Performance_monitoring_interrupts
0.18 ± 60% -36.2% 0.11 ± 9% -39.0% 0.11 ± 4% perf-stat.i.MPKI
1.089e+10 -2.3% 1.064e+10 -4.8% 1.036e+10 perf-stat.i.branch-instructions
1.62 +0.7 2.34 +0.8 2.40 perf-stat.i.branch-miss-rate%
1.741e+08 +42.3% 2.476e+08 +42.2% 2.475e+08 perf-stat.i.branch-misses
2.70 -0.1 2.65 ± 6% +0.2 2.95 ± 3% perf-stat.i.cache-miss-rate%
5228328 +4.0% 5436325 ± 8% -4.5% 4992245 ± 2% perf-stat.i.cache-references
1.36 +3.3% 1.41 +5.5% 1.44 perf-stat.i.cpi
52.10 +0.9% 52.55 +1.8% 53.04 perf-stat.i.cpu-migrations
1.233e+08 ± 3% -7.1% 1.146e+08 +1.6% 1.253e+08 ± 11% perf-stat.i.dTLB-load-misses
2.38e+10 -3.3% 2.302e+10 -4.5% 2.273e+10 perf-stat.i.dTLB-loads
57501510 -4.9% 54711717 -4.6% 54852849 perf-stat.i.dTLB-store-misses
1.828e+10 -3.7% 1.761e+10 -4.3% 1.75e+10 perf-stat.i.dTLB-stores
98.97 -2.9 96.02 ± 2% -29.3 69.69 perf-stat.i.iTLB-load-miss-rate%
29795797 ± 4% -5.0% 28320171 -5.2% 28254639 perf-stat.i.iTLB-load-misses
299268 ± 2% +298.1% 1191476 ± 50% +4062.6% 12457396 ± 4% perf-stat.i.iTLB-loads
5.335e+10 -3.7% 5.138e+10 -5.7% 5.029e+10 perf-stat.i.instructions
0.74 -3.7% 0.71 -5.7% 0.70 perf-stat.i.ipc
0.20 ± 8% +12.1% 0.23 +2.7% 0.21 ± 9% perf-stat.i.major-faults
1104 -3.2% 1069 -4.5% 1055 perf-stat.i.metric.M/sec
66981 +4.3% 69845 ± 6% +10.1% 73725 ± 4% perf-stat.i.node-load-misses
84278 ± 2% +7.2% 90313 ± 6% +9.8% 92543 ± 5% perf-stat.i.node-loads
72308 +2.3% 73975 ± 2% +1.5% 73361 perf-stat.i.node-stores
0.10 +7.9% 0.11 ± 8% +1.3% 0.10 ± 3% perf-stat.overall.MPKI
1.60 +0.7 2.33 +0.8 2.39 perf-stat.overall.branch-miss-rate%
3.60 ± 6% -0.1 3.45 ± 7% +0.3 3.88 ± 2% perf-stat.overall.cache-miss-rate%
1.35 +4.1% 1.41 +6.2% 1.44 perf-stat.overall.cpi
99.00 -3.0 95.98 ± 2% -29.6 69.42 perf-stat.overall.iTLB-load-miss-rate%
0.74 -3.9% 0.71 -5.9% 0.70 perf-stat.overall.ipc
567203 +1.0% 572789 -1.2% 560464 perf-stat.overall.path-length
1.085e+10 -2.3% 1.06e+10 -4.8% 1.033e+10 perf-stat.ps.branch-instructions
1.735e+08 +42.3% 2.468e+08 +42.2% 2.467e+08 perf-stat.ps.branch-misses
5216268 +4.0% 5422673 ± 8% -4.5% 4979211 ± 2% perf-stat.ps.cache-references
51.99 +0.8% 52.43 +1.8% 52.92 perf-stat.ps.cpu-migrations
1.229e+08 ± 3% -7.1% 1.142e+08 +1.6% 1.249e+08 ± 12% perf-stat.ps.dTLB-load-misses
2.372e+10 -3.3% 2.294e+10 -4.5% 2.266e+10 perf-stat.ps.dTLB-loads
57306258 -4.9% 54525679 -4.6% 54668669 perf-stat.ps.dTLB-store-misses
1.822e+10 -3.7% 1.755e+10 -4.3% 1.744e+10 perf-stat.ps.dTLB-stores
29695158 ± 4% -5.0% 28224049 -5.2% 28159995 perf-stat.ps.iTLB-load-misses
298257 ± 2% +298.1% 1187498 ± 50% +4061.6% 12412241 ± 4% perf-stat.ps.iTLB-loads
5.317e+10 -3.7% 5.12e+10 -5.7% 5.012e+10 perf-stat.ps.instructions
0.20 ± 7% +12.0% 0.23 ± 2% +3.0% 0.21 ± 8% perf-stat.ps.major-faults
66882 +4.3% 69726 ± 6% +10.1% 73651 ± 4% perf-stat.ps.node-load-misses
84325 ± 2% +7.1% 90306 ± 6% +9.7% 92489 ± 5% perf-stat.ps.node-loads
1.613e+13 -3.9% 1.55e+13 -5.9% 1.518e+13 perf-stat.total.instructions
8.00 ± 14% -8.0 0.00 -8.0 0.00 perf-profile.calltrace.cycles-pp.iov_iter_copy_from_user_atomic.generic_perform_write.__generic_file_write_iter.generic_file_write_iter.new_sync_write
7.38 ± 14% -7.4 0.00 -7.4 0.00 perf-profile.calltrace.cycles-pp.copyin.iov_iter_copy_from_user_atomic.generic_perform_write.__generic_file_write_iter.generic_file_write_iter
7.27 ± 14% -7.3 0.00 -7.3 0.00 perf-profile.calltrace.cycles-pp.copy_user_enhanced_fast_string.copyin.iov_iter_copy_from_user_atomic.generic_perform_write.__generic_file_write_iter
6.71 ± 12% -0.7 5.98 ± 13% -0.7 6.03 ± 10% perf-profile.calltrace.cycles-pp.syscall_return_via_sysret.__libc_pwrite
4.93 ± 12% -0.6 4.29 ± 14% -0.5 4.40 ± 11% perf-profile.calltrace.cycles-pp.shmem_getpage_gfp.shmem_write_begin.generic_perform_write.__generic_file_write_iter.generic_file_write_iter
5.81 ± 13% -0.6 5.22 ± 14% -0.6 5.17 ± 11% perf-profile.calltrace.cycles-pp.shmem_write_begin.generic_perform_write.__generic_file_write_iter.generic_file_write_iter.new_sync_write
3.50 ± 14% -0.5 3.03 ± 13% -0.4 3.13 ± 11% perf-profile.calltrace.cycles-pp.shmem_write_end.generic_perform_write.__generic_file_write_iter.generic_file_write_iter.new_sync_write
0.69 ± 14% -0.4 0.29 ±100% -0.5 0.14 ±173% perf-profile.calltrace.cycles-pp.up_write.generic_file_write_iter.new_sync_write.vfs_write.ksys_pwrite64
3.44 ± 12% -0.4 3.06 ± 14% -0.4 3.05 ± 12% perf-profile.calltrace.cycles-pp.find_lock_entry.shmem_getpage_gfp.shmem_write_begin.generic_perform_write.__generic_file_write_iter
0.62 ± 15% -0.3 0.30 ±101% -0.2 0.43 ± 59% perf-profile.calltrace.cycles-pp.unlock_page.shmem_write_end.generic_perform_write.__generic_file_write_iter.generic_file_write_iter
0.85 ± 8% -0.2 0.66 ± 15% -0.1 0.71 ± 10% perf-profile.calltrace.cycles-pp.__fget_light.ksys_pwrite64.do_syscall_64.entry_SYSCALL_64_after_hwframe.__libc_pwrite
0.84 ± 14% -0.1 0.71 ± 14% -0.1 0.72 ± 8% perf-profile.calltrace.cycles-pp.set_page_dirty.shmem_write_end.generic_perform_write.__generic_file_write_iter.generic_file_write_iter
0.91 ± 11% -0.1 0.79 ± 12% -0.1 0.82 ± 10% perf-profile.calltrace.cycles-pp.file_update_time.__generic_file_write_iter.generic_file_write_iter.new_sync_write.vfs_write
0.68 ± 15% -0.1 0.58 ± 13% -0.1 0.57 ± 9% perf-profile.calltrace.cycles-pp.page_mapping.set_page_dirty.shmem_write_end.generic_perform_write.__generic_file_write_iter
0.00 +0.0 0.00 +1.0 1.02 ± 11% perf-profile.calltrace.cycles-pp.__get_user_nocheck_1.iovec_fault_in_readable.generic_perform_write.__generic_file_write_iter.generic_file_write_iter
0.00 +0.0 0.00 +1.2 1.17 ± 9% perf-profile.calltrace.cycles-pp.iovec_advance.generic_perform_write.__generic_file_write_iter.generic_file_write_iter.new_sync_write
0.00 +0.0 0.00 +2.1 2.13 ± 11% perf-profile.calltrace.cycles-pp.iovec_fault_in_readable.generic_perform_write.__generic_file_write_iter.generic_file_write_iter.new_sync_write
0.00 +0.0 0.00 +6.8 6.85 ± 10% perf-profile.calltrace.cycles-pp.copy_user_enhanced_fast_string.copyin.iovec_copy_from_user_atomic.generic_perform_write.__generic_file_write_iter
0.00 +0.0 0.00 +6.9 6.95 ± 10% perf-profile.calltrace.cycles-pp.copyin.iovec_copy_from_user_atomic.generic_perform_write.__generic_file_write_iter.generic_file_write_iter
0.00 +0.0 0.00 +8.2 8.17 ± 10% perf-profile.calltrace.cycles-pp.iovec_copy_from_user_atomic.generic_perform_write.__generic_file_write_iter.generic_file_write_iter.new_sync_write
0.00 +1.0 1.01 ± 13% +0.0 0.00 perf-profile.calltrace.cycles-pp.__get_user_nocheck_1.xxx_fault_in_readable.generic_perform_write.__generic_file_write_iter.generic_file_write_iter
0.00 +1.4 1.42 ± 12% +0.0 0.00 perf-profile.calltrace.cycles-pp.xxx_advance.generic_perform_write.__generic_file_write_iter.generic_file_write_iter.new_sync_write
0.00 +2.1 2.15 ± 13% +0.0 0.00 perf-profile.calltrace.cycles-pp.xxx_fault_in_readable.generic_perform_write.__generic_file_write_iter.generic_file_write_iter.new_sync_write
0.00 +6.8 6.82 ± 13% +0.0 0.00 perf-profile.calltrace.cycles-pp.copy_user_enhanced_fast_string.copyin.xxx_copy_from_user_atomic.generic_perform_write.__generic_file_write_iter
0.00 +6.9 6.92 ± 13% +0.0 0.00 perf-profile.calltrace.cycles-pp.copyin.xxx_copy_from_user_atomic.generic_perform_write.__generic_file_write_iter.generic_file_write_iter
0.00 +8.1 8.09 ± 14% +0.0 0.00 perf-profile.calltrace.cycles-pp.xxx_copy_from_user_atomic.generic_perform_write.__generic_file_write_iter.generic_file_write_iter.new_sync_write
8.03 ± 14% -8.0 0.00 -8.0 0.00 perf-profile.children.cycles-pp.iov_iter_copy_from_user_atomic
7.55 ± 12% -0.8 6.75 ± 13% -0.8 6.79 ± 10% perf-profile.children.cycles-pp.syscall_return_via_sysret
4.99 ± 12% -0.6 4.34 ± 14% -0.5 4.45 ± 11% perf-profile.children.cycles-pp.shmem_getpage_gfp
5.84 ± 13% -0.6 5.22 ± 14% -0.6 5.20 ± 11% perf-profile.children.cycles-pp.shmem_write_begin
3.53 ± 13% -0.5 3.07 ± 13% -0.4 3.17 ± 11% perf-profile.children.cycles-pp.shmem_write_end
3.48 ± 12% -0.4 3.09 ± 14% -0.4 3.09 ± 12% perf-profile.children.cycles-pp.find_lock_entry
0.85 ± 8% -0.2 0.66 ± 15% -0.1 0.71 ± 10% perf-profile.children.cycles-pp.__fget_light
0.69 ± 14% -0.2 0.52 ± 15% -0.2 0.48 ± 9% perf-profile.children.cycles-pp.up_write
0.62 ± 13% -0.2 0.46 ± 14% -0.2 0.47 ± 12% perf-profile.children.cycles-pp.apparmor_file_permission
0.86 ± 14% -0.1 0.74 ± 14% -0.1 0.74 ± 8% perf-profile.children.cycles-pp.set_page_dirty
0.94 ± 11% -0.1 0.82 ± 13% -0.1 0.85 ± 10% perf-profile.children.cycles-pp.file_update_time
0.51 ± 12% -0.1 0.40 ± 14% +0.0 0.52 ± 11% perf-profile.children.cycles-pp.balance_dirty_pages_ratelimited
0.71 ± 15% -0.1 0.60 ± 13% -0.1 0.60 ± 9% perf-profile.children.cycles-pp.page_mapping
0.55 ± 12% -0.1 0.47 ± 12% -0.0 0.50 ± 9% perf-profile.children.cycles-pp.current_time
0.62 ± 14% -0.1 0.55 ± 13% -0.1 0.56 ± 13% perf-profile.children.cycles-pp.unlock_page
0.24 ± 13% -0.0 0.20 ± 16% -0.0 0.22 ± 12% perf-profile.children.cycles-pp.timestamp_truncate
0.18 ± 11% -0.0 0.14 ± 15% -0.0 0.18 ± 12% perf-profile.children.cycles-pp.file_remove_privs
0.42 ± 13% -0.0 0.39 ± 14% -0.1 0.36 ± 13% perf-profile.children.cycles-pp.testcase
0.00 +0.0 0.00 +1.2 1.18 ± 9% perf-profile.children.cycles-pp.iovec_advance
0.00 +0.0 0.00 +2.2 2.21 ± 11% perf-profile.children.cycles-pp.iovec_fault_in_readable
0.00 +0.0 0.00 +8.2 8.20 ± 10% perf-profile.children.cycles-pp.iovec_copy_from_user_atomic
0.21 ± 17% +0.1 0.28 ± 16% +0.1 0.29 ± 10% perf-profile.children.cycles-pp.__x86_indirect_thunk_rax
0.55 ± 14% +0.3 0.87 ± 15% +0.3 0.89 ± 13% perf-profile.children.cycles-pp.__x86_retpoline_rax
0.00 +1.4 1.42 ± 12% +0.0 0.00 perf-profile.children.cycles-pp.xxx_advance
0.00 +2.2 2.22 ± 13% +0.0 0.00 perf-profile.children.cycles-pp.xxx_fault_in_readable
0.00 +8.1 8.12 ± 14% +0.0 0.00 perf-profile.children.cycles-pp.xxx_copy_from_user_atomic
7.52 ± 12% -0.8 6.72 ± 13% -0.8 6.77 ± 10% perf-profile.self.cycles-pp.syscall_return_via_sysret
1.02 ± 16% -0.2 0.82 ± 12% -0.1 0.92 ± 10% perf-profile.self.cycles-pp.shmem_getpage_gfp
0.82 ± 8% -0.2 0.63 ± 15% -0.1 0.68 ± 10% perf-profile.self.cycles-pp.__fget_light
0.66 ± 14% -0.2 0.49 ± 15% -0.2 0.46 ± 8% perf-profile.self.cycles-pp.up_write
0.54 ± 15% -0.2 0.39 ± 14% -0.1 0.40 ± 12% perf-profile.self.cycles-pp.apparmor_file_permission
0.59 ± 13% -0.1 0.46 ± 13% -0.1 0.45 ± 9% perf-profile.self.cycles-pp.ksys_pwrite64
0.50 ± 12% -0.1 0.40 ± 13% -0.0 0.47 ± 12% perf-profile.self.cycles-pp.balance_dirty_pages_ratelimited
0.67 ± 15% -0.1 0.57 ± 12% -0.1 0.57 ± 9% perf-profile.self.cycles-pp.page_mapping
0.71 ± 17% -0.1 0.63 ± 13% -0.1 0.60 ± 14% perf-profile.self.cycles-pp.security_file_permission
0.24 ± 15% -0.0 0.19 ± 15% -0.0 0.22 ± 12% perf-profile.self.cycles-pp.timestamp_truncate
0.20 ± 13% -0.0 0.17 ± 12% -0.0 0.18 ± 10% perf-profile.self.cycles-pp.current_time
0.00 +0.0 0.00 +1.1 1.05 ± 9% perf-profile.self.cycles-pp.iovec_advance
0.00 +0.0 0.00 +1.2 1.17 ± 12% perf-profile.self.cycles-pp.iovec_fault_in_readable
0.00 +0.0 0.00 +1.2 1.19 ± 10% perf-profile.self.cycles-pp.iovec_copy_from_user_atomic
0.82 ± 15% +0.0 0.83 ± 12% -0.1 0.71 ± 10% perf-profile.self.cycles-pp.shmem_write_begin
0.12 ± 14% +0.1 0.19 ± 14% +0.1 0.20 ± 7% perf-profile.self.cycles-pp.__x86_indirect_thunk_rax
0.43 ± 14% +0.3 0.68 ± 15% +0.3 0.69 ± 15% perf-profile.self.cycles-pp.__x86_retpoline_rax
0.00 +1.1 1.14 ± 15% +0.0 0.00 perf-profile.self.cycles-pp.xxx_copy_from_user_atomic
0.00 +1.2 1.21 ± 12% +0.0 0.00 perf-profile.self.cycles-pp.xxx_fault_in_readable
0.00 +1.3 1.28 ± 12% +0.0 0.00 perf-profile.self.cycles-pp.xxx_advance
>
> Thanks,
> David
>
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