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Message-ID: <ZrGSGIxpsEoBG2iu@xsang-OptiPlex-9020>
Date: Tue, 6 Aug 2024 11:01:44 +0800
From: Oliver Sang <oliver.sang@...el.com>
To: Yu Zhao <yuzhao@...gle.com>
CC: Muchun Song <muchun.song@...ux.dev>, Janosch Frank
<frankja@...ux.ibm.com>, <oe-lkp@...ts.linux.dev>, <lkp@...el.com>, "Linux
Memory Management List" <linux-mm@...ck.org>, Andrew Morton
<akpm@...ux-foundation.org>, David Hildenbrand <david@...hat.com>, "Frank van
der Linden" <fvdl@...gle.com>, Matthew Wilcox <willy@...radead.org>, Peter Xu
<peterx@...hat.com>, Yang Shi <yang@...amperecomputing.com>,
<linux-kernel@...r.kernel.org>, <ying.huang@...el.com>,
<feng.tang@...el.com>, <fengwei.yin@...el.com>, Christian Borntraeger
<borntraeger@...ux.ibm.com>, Claudio Imbrenda <imbrenda@...ux.ibm.com>, "Marc
Hartmayer" <mhartmay@...ux.ibm.com>, Heiko Carstens <hca@...ux.ibm.com>,
Yosry Ahmed <yosryahmed@...gle.com>, <oliver.sang@...el.com>
Subject: Re: [linux-next:master] [mm/hugetlb_vmemmap] 875fa64577:
vm-scalability.throughput -34.3% regression
hi, Yu Zhao,
On Sat, Aug 03, 2024 at 04:07:55PM -0600, Yu Zhao wrote:
> Hi Oliver,
>
> On Fri, Jul 19, 2024 at 10:06 AM Yu Zhao <yuzhao@...gle.com> wrote:
> >
> > On Fri, Jul 19, 2024 at 2:44 AM Oliver Sang <oliver.sang@...el.com> wrote:
> > >
> > > hi, Yu Zhao,
> > >
> > > On Wed, Jul 17, 2024 at 09:44:33AM -0600, Yu Zhao wrote:
> > > > On Wed, Jul 17, 2024 at 2:36 AM Yu Zhao <yuzhao@...gle.com> wrote:
> > > > >
> > > > > Hi Janosch and Oliver,
> > > > >
> > > > > On Wed, Jul 17, 2024 at 1:57 AM Janosch Frank <frankja@...ux.ibm.com> wrote:
> > > > > >
> > > > > > On 7/9/24 07:11, kernel test robot wrote:
> > > > > > > Hello,
> > > > > > >
> > > > > > > kernel test robot noticed a -34.3% regression of vm-scalability.throughput on:
> > > > > > >
> > > > > > >
> > > > > > > commit: 875fa64577da9bc8e9963ee14fef8433f20653e7 ("mm/hugetlb_vmemmap: fix race with speculative PFN walkers")
> > > > > > > https://git.kernel.org/cgit/linux/kernel/git/next/linux-next.git master
> > > > > > >
> > > > > > > [still regression on linux-next/master 0b58e108042b0ed28a71cd7edf5175999955b233]
> > > > > > >
> > > > > > This has hit s390 huge page backed KVM guests as well.
> > > > > > Our simple start/stop test case went from ~5 to over 50 seconds of runtime.
> > > > >
> > > > > Could you try the attached patch please? Thank you.
> > > >
> > > > Thanks, Yosry, for spotting the following typo:
> > > > flags &= VMEMMAP_SYNCHRONIZE_RCU;
> > > > It's supposed to be:
> > > > flags &= ~VMEMMAP_SYNCHRONIZE_RCU;
> > > >
> > > > Reattaching v2 with the above typo fixed. Please let me know, Janosch & Oliver.
> > >
> > > since the commit is in mainline now, I directly apply your v2 patch upon
> > > bd225530a4c71 ("mm/hugetlb_vmemmap: fix race with speculative PFN walkers")
> > >
> > > in our tests, your v2 patch not only recovers the performance regression,
> >
> > Thanks for verifying the fix!
> >
> > > it even has +13.7% performance improvement than 5a4d8944d6b1e (parent of
> > > bd225530a4c71)
> >
> > Glad to hear!
> >
> > (The original patch improved and regressed the performance at the same
> > time, but the regression is bigger. The fix removed the regression and
> > surfaced the improvement.)
>
> Can you please run the benchmark again with the attached patch on top
> of the last fix?
last time, I applied your last fix (1) directly upon mainline commit (2)
9a5b87b521401 fix for 875fa64577 (then bd225530a4 in main) <--- (1)
bd225530a4c71 mm/hugetlb_vmemmap: fix race with speculative PFN walkers <--- (2)
but I failed to apply your patch this time upon (1)
then I found I can apply above (1) upon mainline commit (3), as below (4).
your patch this time can be applied upon (4) successfully, as below (5)
e2b8dff50992a new hugetlb-20240805.patch <--- (5)
b5af188232e56 v2 fix for bd225530a4 but apply on mainline tip 17712b7ea0756 <--- (4)
17712b7ea0756 Merge tag 'io_uring-6.11-20240802' of git://git.kernel.dk/linux <--- (3)
I tested (3)(4)(5) and compared them with bd225530a4c71 and its parent. detail
as below [1]
you may notice the data for bd225530a4c71 and its parent are different with
previous data. this is due to we found some problem for gcc-13, we convert
to use gcc-12 now, our config is also changed.
we have below observations.
* bd225530a4c71 still has a similar -36.6% regression compare to its parent
* 17712b7ea0756 has similar data as bd225530a4c71 (a little worse, so -39.2%
comparing to 5a4d8944d6b1e who is parent of bd225530a4c71)
* your last fix still do the work to recover the regression, but is not better
than 5a4d8944d6b1e
* your patch this time seems not impact performance data a lot
[1]
=========================================================================================
compiler/cpufreq_governor/kconfig/rootfs/runtime/size/tbox_group/test/testcase:
gcc-12/performance/x86_64-rhel-8.3/debian-12-x86_64-20240206.cgz/300s/512G/lkp-icl-2sp2/anon-cow-rand-hugetlb/vm-scalability
commit:
5a4d8944d6b1e ("cachestat: do not flush stats in recency check")
bd225530a4c71 ("mm/hugetlb_vmemmap: fix race with speculative PFN walkers")
17712b7ea0756 ("Merge tag 'io_uring-6.11-20240802' of git://git.kernel.dk/linux")
b5af188232e56 <--- apply your last fix upon 17712b7ea0756
e2b8dff50992a <--- then apply your patch this time upon b5af188232e56
5a4d8944d6b1e1aa bd225530a4c717714722c373144 17712b7ea0756799635ba159cc7 b5af188232e564d17fc3c1784f7 e2b8dff50992a56c67308f905bd
---------------- --------------------------- --------------------------- --------------------------- ---------------------------
%stddev %change %stddev %change %stddev %change %stddev %change %stddev
\ | \ | \ | \ | \
3.312e+09 ± 34% +472.2% 1.895e+10 ± 3% +487.2% 1.945e+10 ± 7% -4.4% 3.167e+09 ± 29% -15.6% 2.795e+09 ± 29% cpuidle..time
684985 ± 5% +1112.3% 8304355 ± 2% +1099.5% 8216278 -2.4% 668573 ± 5% -5.2% 649406 ± 2% cpuidle..usage
231.53 ± 3% +40.7% 325.70 ± 2% +45.1% 335.98 ± 5% +1.4% 234.78 ± 4% +0.2% 231.94 ± 3% uptime.boot
10015 ± 10% +156.8% 25723 ± 4% +156.8% 25724 ± 7% +4.3% 10447 ± 12% -0.7% 9945 ± 13% uptime.idle
577860 ± 7% +18.1% 682388 ± 8% +12.1% 647808 ± 6% +9.9% 635341 ± 6% -0.3% 576189 ± 5% numa-numastat.node0.local_node
624764 ± 5% +16.1% 725128 ± 4% +18.0% 736975 ± 2% +10.2% 688399 ± 2% +3.0% 643587 ± 5% numa-numastat.node0.numa_hit
647823 ± 5% +11.3% 721266 ± 9% +15.7% 749411 ± 6% -10.0% 583278 ± 5% -1.0% 641117 ± 3% numa-numastat.node1.local_node
733550 ± 4% +10.6% 811157 ± 4% +8.4% 795091 ± 3% -9.0% 667814 ± 3% -3.4% 708807 ± 3% numa-numastat.node1.numa_hit
6.17 ±108% +1521.6% 100.00 ± 38% +26137.8% 1618 ±172% -74.1% 1.60 ± 84% +27.0% 7.83 ±114% perf-c2c.DRAM.local
46.17 ± 43% +2759.6% 1320 ± 26% +12099.6% 5632 ±112% +18.3% 54.60 ± 56% +48.7% 68.67 ± 42% perf-c2c.DRAM.remote
36.50 ± 52% +1526.5% 593.67 ± 26% +1305.5% 513.00 ± 53% +2.5% 37.40 ± 46% +62.6% 59.33 ± 66% perf-c2c.HITM.local
15.33 ± 74% +2658.7% 423.00 ± 36% +2275.0% 364.17 ± 67% +48.7% 22.80 ± 75% +122.8% 34.17 ± 58% perf-c2c.HITM.remote
15.34 ± 27% +265.8% 56.12 +256.0% 54.63 -2.5% 14.96 ± 23% -12.7% 13.39 ± 23% vmstat.cpu.id
73.93 ± 5% -41.4% 43.30 ± 2% -39.3% 44.85 ± 2% +0.5% 74.27 ± 4% +2.4% 75.72 ± 3% vmstat.cpu.us
110.76 ± 4% -47.2% 58.47 ± 2% -45.7% 60.14 ± 2% +0.1% 110.90 ± 4% +1.9% 112.84 ± 3% vmstat.procs.r
2729 ± 3% +167.3% 7294 ± 2% +155.7% 6979 ± 4% +0.2% 2734 -1.3% 2692 ± 5% vmstat.system.cs
150274 ± 5% -23.2% 115398 ± 6% -27.2% 109377 ± 13% +0.6% 151130 ± 4% +0.9% 151666 ± 3% vmstat.system.in
14.31 ± 29% +41.4 55.74 +40.0 54.31 -0.5 13.85 ± 25% -1.9 12.42 ± 24% mpstat.cpu.all.idle%
0.34 ± 5% -0.1 0.21 ± 2% -0.1 0.21 ± 2% -0.0 0.34 ± 4% +0.0 0.35 ± 4% mpstat.cpu.all.irq%
0.02 ± 4% +0.0 0.03 +0.0 0.03 ± 4% -0.0 0.02 ± 2% -0.0 0.02 ± 2% mpstat.cpu.all.soft%
10.63 ± 4% -10.2 0.43 ± 4% -10.3 0.35 ± 29% +0.1 10.71 ± 2% +0.2 10.79 ± 4% mpstat.cpu.all.sys%
74.69 ± 5% -31.1 43.59 ± 2% -29.6 45.10 ± 2% +0.4 75.08 ± 4% +1.7 76.42 ± 3% mpstat.cpu.all.usr%
6.83 ± 15% +380.5% 32.83 ± 45% +217.1% 21.67 ± 5% +40.5% 9.60 ± 41% -7.3% 6.33 ± 7% mpstat.max_utilization.seconds
0.71 ± 55% +0.4 1.14 ± 3% +0.2 0.96 ± 44% +0.4 1.09 ± 4% +0.2 0.91 ± 30% perf-profile.calltrace.cycles-pp.lrand48_r
65.57 ± 10% +3.5 69.09 -7.3 58.23 ± 45% +2.4 67.94 +7.2 72.76 perf-profile.calltrace.cycles-pp.do_rw_once
0.06 ± 7% -0.0 0.05 ± 46% +0.0 0.11 ± 48% +0.0 0.07 ± 16% +0.0 0.08 ± 16% perf-profile.children.cycles-pp.get_jiffies_update
0.28 ± 10% +0.0 0.29 ± 8% +0.3 0.58 ± 74% +0.0 0.30 ± 13% +0.0 0.32 ± 12% perf-profile.children.cycles-pp.__hrtimer_run_queues
0.24 ± 10% +0.0 0.25 ± 10% +0.2 0.46 ± 66% +0.0 0.26 ± 13% +0.0 0.28 ± 12% perf-profile.children.cycles-pp.update_process_times
0.06 ± 7% -0.0 0.05 ± 46% +0.0 0.11 ± 48% +0.0 0.07 ± 16% +0.0 0.08 ± 16% perf-profile.self.cycles-pp.get_jiffies_update
0.50 ± 7% +0.1 0.56 ± 3% -0.0 0.46 ± 44% +0.0 0.53 ± 3% +0.0 0.52 ± 6% perf-profile.self.cycles-pp.lrand48_r@plt
26722 ± 4% -33.8% 17690 ± 15% -40.0% 16038 ± 29% +6.9% 28560 ± 3% +9.0% 29116 ± 3% numa-meminfo.node0.HugePages_Surp
26722 ± 4% -33.8% 17690 ± 15% -40.0% 16038 ± 29% +6.9% 28560 ± 3% +9.0% 29116 ± 3% numa-meminfo.node0.HugePages_Total
74013758 ± 3% +24.7% 92302659 ± 5% +30.0% 96190384 ± 9% -5.6% 69852204 ± 2% -6.0% 69592735 ± 3% numa-meminfo.node0.MemFree
57671194 ± 4% -31.7% 39382292 ± 12% -38.5% 35494567 ± 26% +7.2% 61832747 ± 3% +7.7% 62092216 ± 3% numa-meminfo.node0.MemUsed
84822 ± 19% +57.1% 133225 ± 17% +13.5% 96280 ± 39% -4.4% 81114 ± 9% -6.0% 79743 ± 11% numa-meminfo.node1.Active
84781 ± 19% +57.1% 133211 ± 17% +13.5% 96254 ± 39% -4.4% 81091 ± 9% -6.0% 79729 ± 11% numa-meminfo.node1.Active(anon)
78416592 ± 7% +13.3% 88860070 ± 5% +6.7% 83660976 ± 11% +4.5% 81951764 ± 4% +2.4% 80309519 ± 3% numa-meminfo.node1.MemFree
53641607 ± 11% -19.5% 43198129 ± 11% -9.8% 48397199 ± 19% -6.6% 50106411 ± 7% -3.5% 51748656 ± 4% numa-meminfo.node1.MemUsed
18516537 ± 3% +24.7% 23084190 ± 5% +29.9% 24053750 ± 9% -5.6% 17484374 ± 3% -6.1% 17387753 ± 2% numa-vmstat.node0.nr_free_pages
624065 ± 5% +16.0% 724171 ± 4% +18.0% 736399 ± 2% +10.1% 687335 ± 2% +3.0% 642802 ± 5% numa-vmstat.node0.numa_hit
577161 ± 8% +18.1% 681431 ± 8% +12.1% 647232 ± 6% +9.9% 634277 ± 6% -0.3% 575404 ± 5% numa-vmstat.node0.numa_local
21141 ± 19% +57.4% 33269 ± 17% +13.7% 24027 ± 39% -4.2% 20242 ± 9% -5.6% 19967 ± 11% numa-vmstat.node1.nr_active_anon
19586357 ± 7% +13.5% 22224344 ± 5% +6.8% 20914089 ± 11% +4.6% 20487157 ± 4% +2.6% 20087311 ± 3% numa-vmstat.node1.nr_free_pages
21141 ± 19% +57.4% 33269 ± 17% +13.7% 24027 ± 39% -4.2% 20242 ± 9% -5.6% 19967 ± 11% numa-vmstat.node1.nr_zone_active_anon
732629 ± 4% +10.5% 809596 ± 4% +8.4% 793911 ± 3% -9.0% 666417 ± 3% -3.5% 707191 ± 3% numa-vmstat.node1.numa_hit
646902 ± 5% +11.3% 719705 ± 9% +15.7% 748231 ± 6% -10.1% 581882 ± 5% -1.1% 639501 ± 3% numa-vmstat.node1.numa_local
167.87 ± 2% +56.6% 262.93 +65.3% 277.49 ± 3% -1.9% 164.74 -1.8% 164.84 time.elapsed_time
167.87 ± 2% +56.6% 262.93 +65.3% 277.49 ± 3% -1.9% 164.74 -1.8% 164.84 time.elapsed_time.max
140035 ± 6% -50.5% 69271 ± 5% -50.8% 68889 ± 4% -5.9% 131759 ± 3% -1.2% 138362 ± 8% time.involuntary_context_switches
163.67 ± 10% +63.7% 268.00 ± 5% +76.5% 288.83 ± 5% +13.0% 185.00 ± 8% +22.4% 200.33 ± 4% time.major_page_faults
11308 ± 2% -48.4% 5830 -47.0% 5995 +1.8% 11514 +2.5% 11591 time.percent_of_cpu_this_job_got
2347 -94.0% 139.98 ± 3% -95.0% 117.34 ± 21% +0.3% 2354 -0.0% 2347 time.system_time
16627 -8.6% 15191 -0.6% 16529 ± 5% -0.1% 16616 +0.8% 16759 ± 2% time.user_time
12158 ± 2% +5329.5% 660155 +5325.1% 659615 -1.0% 12037 ± 3% -1.4% 11985 ± 3% time.voluntary_context_switches
59662 -37.0% 37607 -40.5% 35489 ± 4% +0.5% 59969 -0.1% 59610 vm-scalability.median
2.19 ± 20% +1.7 3.91 ± 30% +3.3 5.51 ± 30% +0.6 2.82 ± 23% +1.5 3.72 ± 25% vm-scalability.median_stddev%
2.92 ± 22% +0.6 3.49 ± 32% +1.5 4.45 ± 19% +0.4 3.35 ± 17% +1.5 4.39 ± 16% vm-scalability.stddev%
7821791 -36.6% 4961402 -39.2% 4758850 ± 2% -0.2% 7809010 -0.7% 7769662 vm-scalability.throughput
167.87 ± 2% +56.6% 262.93 +65.3% 277.49 ± 3% -1.9% 164.74 -1.8% 164.84 vm-scalability.time.elapsed_time
167.87 ± 2% +56.6% 262.93 +65.3% 277.49 ± 3% -1.9% 164.74 -1.8% 164.84 vm-scalability.time.elapsed_time.max
140035 ± 6% -50.5% 69271 ± 5% -50.8% 68889 ± 4% -5.9% 131759 ± 3% -1.2% 138362 ± 8% vm-scalability.time.involuntary_context_switches
11308 ± 2% -48.4% 5830 -47.0% 5995 +1.8% 11514 +2.5% 11591 vm-scalability.time.percent_of_cpu_this_job_got
2347 -94.0% 139.98 ± 3% -95.0% 117.34 ± 21% +0.3% 2354 -0.0% 2347 vm-scalability.time.system_time
16627 -8.6% 15191 -0.6% 16529 ± 5% -0.1% 16616 +0.8% 16759 ± 2% vm-scalability.time.user_time
12158 ± 2% +5329.5% 660155 +5325.1% 659615 -1.0% 12037 ± 3% -1.4% 11985 ± 3% vm-scalability.time.voluntary_context_switches
88841 ± 18% +56.6% 139142 ± 16% +18.6% 105352 ± 34% -3.1% 86098 ± 9% -6.8% 82770 ± 11% meminfo.Active
88726 ± 18% +56.7% 139024 ± 16% +18.6% 105233 ± 34% -3.1% 85984 ± 9% -6.8% 82654 ± 11% meminfo.Active(anon)
79226777 ± 3% +18.1% 93562456 +17.2% 92853282 -0.3% 78961619 ± 2% -1.5% 78023229 ± 2% meminfo.CommitLimit
51410 ± 5% -27.2% 37411 ± 2% -25.9% 38103 ± 2% +0.5% 51669 ± 4% +2.3% 52586 ± 3% meminfo.HugePages_Surp
51410 ± 5% -27.2% 37411 ± 2% -25.9% 38103 ± 2% +0.5% 51669 ± 4% +2.3% 52586 ± 3% meminfo.HugePages_Total
1.053e+08 ± 5% -27.2% 76618243 ± 2% -25.9% 78036556 ± 2% +0.5% 1.058e+08 ± 4% +2.3% 1.077e+08 ± 3% meminfo.Hugetlb
59378 ± 9% -27.2% 43256 ± 9% -29.4% 41897 ± 15% -3.0% 57584 ± 9% -1.5% 58465 ± 8% meminfo.Mapped
1.513e+08 ± 3% +19.0% 1.801e+08 +18.1% 1.787e+08 -0.3% 1.508e+08 ± 3% -1.6% 1.489e+08 ± 2% meminfo.MemAvailable
1.523e+08 ± 3% +18.9% 1.811e+08 +18.0% 1.798e+08 -0.3% 1.518e+08 ± 3% -1.6% 1.499e+08 ± 2% meminfo.MemFree
1.114e+08 ± 4% -25.8% 82607720 ± 2% -24.6% 83956777 ± 2% +0.5% 1.119e+08 ± 4% +2.2% 1.138e+08 ± 3% meminfo.Memused
10914 ± 2% -9.3% 9894 -9.0% 9935 +0.8% 10999 ± 2% +1.3% 11059 meminfo.PageTables
235415 ± 4% +17.2% 275883 ± 9% +2.4% 241001 ± 17% -1.9% 230929 ± 2% -2.2% 230261 ± 4% meminfo.Shmem
22170 ± 18% +57.0% 34801 ± 17% +18.9% 26361 ± 34% -2.6% 21594 ± 9% -6.6% 20698 ± 11% proc-vmstat.nr_active_anon
3774988 ± 3% +19.0% 4493004 +18.2% 4461258 -0.3% 3762775 ± 2% -1.7% 3712537 ± 2% proc-vmstat.nr_dirty_background_threshold
7559208 ± 3% +19.0% 8996995 +18.2% 8933426 -0.3% 7534750 ± 2% -1.7% 7434153 ± 2% proc-vmstat.nr_dirty_threshold
824427 +1.2% 834568 +0.3% 826777 -0.0% 824269 -0.0% 824023 proc-vmstat.nr_file_pages
38091344 ± 3% +18.9% 45280310 +18.0% 44962412 -0.3% 37969040 ± 2% -1.6% 37466065 ± 2% proc-vmstat.nr_free_pages
25681 -1.7% 25241 -1.6% 25268 +0.9% 25908 -0.1% 25665 proc-vmstat.nr_kernel_stack
15161 ± 9% -28.5% 10841 ± 9% -30.3% 10565 ± 14% -3.4% 14641 ± 9% -2.1% 14849 ± 7% proc-vmstat.nr_mapped
2729 ± 2% -9.4% 2473 -9.1% 2480 +0.7% 2748 ± 2% +1.2% 2762 proc-vmstat.nr_page_table_pages
58775 ± 4% +17.3% 68926 ± 9% +2.5% 60274 ± 18% -1.8% 57736 ± 2% -2.1% 57526 ± 4% proc-vmstat.nr_shmem
22170 ± 18% +57.0% 34801 ± 17% +18.9% 26361 ± 34% -2.6% 21594 ± 9% -6.6% 20698 ± 11% proc-vmstat.nr_zone_active_anon
1360860 +13.0% 1537181 +12.7% 1533834 -0.2% 1357949 -0.5% 1354233 proc-vmstat.numa_hit
1228230 +14.4% 1404550 +13.9% 1398987 -0.6% 1220355 -0.7% 1219146 proc-vmstat.numa_local
132626 +0.0% 132681 +1.7% 134822 +3.7% 137582 ± 4% +1.9% 135086 proc-vmstat.numa_other
1186558 +18.1% 1400807 +19.5% 1417837 -0.3% 1182763 -0.5% 1180560 proc-vmstat.pgfault
31861 ± 3% +28.2% 40847 +31.7% 41945 ± 5% -3.1% 30881 ± 3% -1.7% 31316 ± 4% proc-vmstat.pgreuse
17.18 ± 3% +337.2% 75.11 ± 2% +318.3% 71.87 ± 5% -1.3% 16.96 ± 4% -0.0% 17.18 ± 3% perf-stat.i.MPKI
1.727e+10 ± 5% -37.8% 1.073e+10 ± 2% -41.2% 1.015e+10 ± 6% +0.7% 1.738e+10 ± 3% +1.7% 1.757e+10 ± 4% perf-stat.i.branch-instructions
0.12 ± 36% +0.6 0.73 ± 5% +0.7 0.79 ± 6% +0.0 0.12 ± 27% -0.0 0.11 ± 32% perf-stat.i.branch-miss-rate%
10351997 ± 16% -28.0% 7451909 ± 13% -29.7% 7276965 ± 16% -10.0% 9315546 ± 22% -7.3% 9592438 ± 25% perf-stat.i.branch-misses
94.27 ± 3% -20.3 73.99 ± 2% -19.2 75.03 -0.8 93.49 ± 3% +0.3 94.60 ± 3% perf-stat.i.cache-miss-rate%
9.7e+08 ± 5% -39.6% 5.859e+08 ± 2% -42.8% 5.552e+08 ± 5% +0.6% 9.759e+08 ± 3% +1.6% 9.854e+08 ± 4% perf-stat.i.cache-misses
9.936e+08 ± 5% -35.3% 6.431e+08 ± 2% -38.8% 6.084e+08 ± 5% +0.5% 9.99e+08 ± 3% +1.5% 1.008e+09 ± 4% perf-stat.i.cache-references
2640 ± 3% +180.7% 7410 ± 2% +168.8% 7097 ± 4% -0.0% 2640 -1.5% 2601 ± 5% perf-stat.i.context-switches
4.60 ± 2% +22.2% 5.62 +18.1% 5.44 ± 5% -1.0% 4.56 ± 2% +0.5% 4.62 perf-stat.i.cpi
2.888e+11 ± 5% -47.9% 1.503e+11 ± 2% -46.8% 1.538e+11 ± 2% +0.6% 2.907e+11 ± 4% +2.4% 2.956e+11 ± 3% perf-stat.i.cpu-cycles
214.97 ± 3% +48.6% 319.40 ± 2% +50.3% 323.15 +0.3% 215.56 +0.9% 216.91 perf-stat.i.cpu-migrations
7.4e+10 ± 5% -37.6% 4.618e+10 ± 2% -41.0% 4.369e+10 ± 6% +0.7% 7.449e+10 ± 3% +1.7% 7.529e+10 ± 4% perf-stat.i.instructions
0.28 ± 7% +33.6% 0.38 ± 3% +31.5% 0.37 ± 2% +0.0% 0.28 ± 6% -2.7% 0.27 ± 5% perf-stat.i.ipc
6413 ± 4% -21.5% 5037 -24.5% 4839 ± 5% -0.2% 6397 ± 4% +0.8% 6464 ± 2% perf-stat.i.minor-faults
6414 ± 4% -21.5% 5038 -24.5% 4840 ± 5% -0.3% 6398 ± 4% +0.8% 6465 ± 2% perf-stat.i.page-faults
13.16 -4.0% 12.64 -3.9% 12.64 +0.0% 13.17 +0.1% 13.17 perf-stat.overall.MPKI
97.57 -6.3 91.24 -6.1 91.44 +0.1 97.64 +0.1 97.67 perf-stat.overall.cache-miss-rate%
3.91 -16.9% 3.25 -9.8% 3.53 ± 5% -0.0% 3.91 +0.7% 3.94 perf-stat.overall.cpi
296.89 -13.4% 257.07 -6.1% 278.90 ± 5% -0.1% 296.69 +0.7% 298.84 perf-stat.overall.cycles-between-cache-misses
0.26 +20.3% 0.31 +11.1% 0.28 ± 5% +0.0% 0.26 -0.7% 0.25 perf-stat.overall.ipc
10770 -2.2% 10537 -2.3% 10523 +0.2% 10788 +0.1% 10784 perf-stat.overall.path-length
1.7e+10 ± 4% -36.8% 1.074e+10 ± 2% -39.8% 1.023e+10 ± 5% +0.6% 1.711e+10 ± 3% +1.6% 1.727e+10 ± 4% perf-stat.ps.branch-instructions
10207074 ± 15% -27.2% 7428222 ± 13% -29.6% 7182646 ± 16% -9.7% 9221719 ± 22% -6.6% 9530095 ± 25% perf-stat.ps.branch-misses
9.588e+08 ± 4% -39.1% 5.838e+08 -42.0% 5.566e+08 ± 5% +0.7% 9.651e+08 ± 3% +1.6% 9.744e+08 ± 4% perf-stat.ps.cache-misses
9.826e+08 ± 4% -34.9% 6.398e+08 -38.1% 6.087e+08 ± 5% +0.6% 9.884e+08 ± 3% +1.5% 9.975e+08 ± 4% perf-stat.ps.cache-references
2628 ± 3% +176.7% 7271 ± 2% +164.7% 6956 ± 4% +0.3% 2635 -1.0% 2600 ± 5% perf-stat.ps.context-switches
2.847e+11 ± 4% -47.3% 1.501e+11 ± 2% -45.6% 1.548e+11 ± 2% +0.6% 2.864e+11 ± 4% +2.3% 2.911e+11 ± 3% perf-stat.ps.cpu-cycles
213.42 ± 3% +47.5% 314.87 ± 2% +49.2% 318.34 +0.5% 214.42 +1.3% 216.10 perf-stat.ps.cpu-migrations
7.284e+10 ± 4% -36.6% 4.62e+10 ± 2% -39.6% 4.402e+10 ± 5% +0.6% 7.33e+10 ± 3% +1.6% 7.398e+10 ± 4% perf-stat.ps.instructions
6416 ± 3% -22.4% 4976 -25.6% 4772 ± 5% +0.2% 6426 ± 3% +1.6% 6516 ± 2% perf-stat.ps.minor-faults
6417 ± 3% -22.4% 4977 -25.6% 4774 ± 5% +0.2% 6428 ± 3% +1.6% 6517 ± 2% perf-stat.ps.page-faults
1.268e+13 -2.2% 1.241e+13 -2.3% 1.239e+13 +0.2% 1.27e+13 +0.1% 1.27e+13 perf-stat.total.instructions
7783325 ± 13% -22.8% 6008522 ± 10% -20.8% 6163644 ± 20% -13.8% 6708575 ± 22% -4.5% 7429947 ± 26% sched_debug.cfs_rq:/.avg_vruntime.avg
8109328 ± 13% -18.8% 6584206 ± 10% -15.3% 6872509 ± 19% -14.2% 6957983 ± 22% -5.4% 7673718 ± 26% sched_debug.cfs_rq:/.avg_vruntime.max
244161 ± 30% +28.2% 313090 ± 22% +76.6% 431126 ± 21% -23.5% 186903 ± 26% -28.7% 173977 ± 29% sched_debug.cfs_rq:/.avg_vruntime.stddev
0.66 ± 11% -22.0% 0.52 ± 21% -41.3% 0.39 ± 29% -0.1% 0.66 ± 8% -3.5% 0.64 ± 16% sched_debug.cfs_rq:/.h_nr_running.avg
495.88 ± 33% -44.7% 274.12 ± 3% -11.5% 438.85 ± 32% -11.2% 440.30 ± 18% -12.2% 435.24 ± 27% sched_debug.cfs_rq:/.load_avg.max
81.79 ± 28% -33.2% 54.62 ± 16% -15.5% 69.10 ± 26% +7.2% 87.66 ± 23% -8.4% 74.91 ± 38% sched_debug.cfs_rq:/.load_avg.stddev
7783325 ± 13% -22.8% 6008522 ± 10% -20.8% 6163644 ± 20% -13.8% 6708575 ± 22% -4.5% 7429947 ± 26% sched_debug.cfs_rq:/.min_vruntime.avg
8109328 ± 13% -18.8% 6584206 ± 10% -15.3% 6872509 ± 19% -14.2% 6957983 ± 22% -5.4% 7673718 ± 26% sched_debug.cfs_rq:/.min_vruntime.max
244161 ± 30% +28.2% 313090 ± 22% +76.6% 431126 ± 21% -23.5% 186902 ± 26% -28.7% 173977 ± 29% sched_debug.cfs_rq:/.min_vruntime.stddev
0.66 ± 11% -22.3% 0.51 ± 21% -41.5% 0.38 ± 29% -0.4% 0.66 ± 8% -3.8% 0.63 ± 16% sched_debug.cfs_rq:/.nr_running.avg
382.00 ± 36% -44.2% 213.33 ± 8% -23.3% 292.98 ± 42% -2.3% 373.40 ± 18% +4.0% 397.33 ± 20% sched_debug.cfs_rq:/.removed.load_avg.max
194.86 ± 36% -44.3% 108.59 ± 8% -24.0% 148.18 ± 40% -2.4% 190.23 ± 18% +3.7% 202.10 ± 20% sched_debug.cfs_rq:/.removed.runnable_avg.max
194.86 ± 36% -44.3% 108.59 ± 8% -24.0% 148.18 ± 40% -2.4% 190.23 ± 18% +3.7% 202.10 ± 20% sched_debug.cfs_rq:/.removed.util_avg.max
713.50 ± 11% -22.6% 552.00 ± 20% -39.7% 430.54 ± 26% -0.2% 712.27 ± 7% -3.0% 691.86 ± 14% sched_debug.cfs_rq:/.runnable_avg.avg
1348 ± 10% -15.9% 1133 ± 15% -20.9% 1067 ± 12% +2.4% 1380 ± 8% +5.1% 1417 ± 18% sched_debug.cfs_rq:/.runnable_avg.max
708.60 ± 11% -22.6% 548.41 ± 20% -39.6% 427.82 ± 26% -0.1% 707.59 ± 7% -3.1% 686.34 ± 14% sched_debug.cfs_rq:/.util_avg.avg
1119 ± 5% -16.3% 937.08 ± 11% -18.6% 910.83 ± 11% +2.0% 1141 ± 6% -0.1% 1117 ± 8% sched_debug.cfs_rq:/.util_avg.max
633.71 ± 11% -95.7% 27.38 ± 17% -96.7% 21.00 ± 19% -0.6% 630.15 ± 10% -3.6% 610.78 ± 17% sched_debug.cfs_rq:/.util_est.avg
1102 ± 18% -63.9% 397.88 ± 15% -67.5% 358.19 ± 8% +6.1% 1169 ± 14% +6.6% 1174 ± 24% sched_debug.cfs_rq:/.util_est.max
119.77 ± 55% -64.5% 42.46 ± 12% -67.8% 38.59 ± 12% -3.2% 115.93 ± 51% -12.3% 105.01 ± 70% sched_debug.cfs_rq:/.util_est.stddev
145182 ± 12% -37.6% 90551 ± 11% -29.5% 102317 ± 18% -7.3% 134528 ± 10% -17.2% 120251 ± 18% sched_debug.cpu.avg_idle.stddev
122256 ± 8% +41.4% 172906 ± 7% +38.2% 168929 ± 14% -5.4% 115642 ± 6% -1.3% 120639 ± 14% sched_debug.cpu.clock.avg
122268 ± 8% +41.4% 172920 ± 7% +38.2% 168942 ± 14% -5.4% 115657 ± 6% -1.3% 120655 ± 14% sched_debug.cpu.clock.max
122242 ± 8% +41.4% 172892 ± 7% +38.2% 168914 ± 14% -5.4% 115627 ± 6% -1.3% 120621 ± 14% sched_debug.cpu.clock.min
121865 ± 8% +41.5% 172490 ± 7% +38.3% 168517 ± 14% -5.4% 115298 ± 6% -1.3% 120268 ± 14% sched_debug.cpu.clock_task.avg
122030 ± 8% +41.5% 172681 ± 7% +38.3% 168714 ± 14% -5.4% 115451 ± 6% -1.3% 120421 ± 14% sched_debug.cpu.clock_task.max
112808 ± 8% +44.2% 162675 ± 7% +41.0% 159006 ± 15% -5.5% 106630 ± 7% -1.1% 111604 ± 15% sched_debug.cpu.clock_task.min
5671 ± 6% +24.6% 7069 ± 4% +24.0% 7034 ± 8% -7.2% 5261 ± 7% -3.5% 5471 ± 10% sched_debug.cpu.curr->pid.max
0.00 ± 12% +22.5% 0.00 ± 50% +17.7% 0.00 ± 42% +71.0% 0.00 ± 35% +59.0% 0.00 ± 43% sched_debug.cpu.next_balance.stddev
0.66 ± 11% -22.0% 0.51 ± 21% -41.4% 0.39 ± 29% -0.3% 0.66 ± 8% -3.6% 0.64 ± 16% sched_debug.cpu.nr_running.avg
2659 ± 12% +208.6% 8204 ± 7% +192.0% 7763 ± 14% -10.1% 2391 ± 11% -6.2% 2493 ± 15% sched_debug.cpu.nr_switches.avg
679.31 ± 10% +516.8% 4189 ± 14% +401.6% 3407 ± 24% -14.7% 579.50 ± 19% -6.8% 633.18 ± 25% sched_debug.cpu.nr_switches.min
0.00 ± 9% +12202.6% 0.31 ± 42% +12627.8% 0.32 ± 37% +67.0% 0.00 ± 50% -34.8% 0.00 ± 72% sched_debug.cpu.nr_uninterruptible.avg
122243 ± 8% +41.4% 172893 ± 7% +38.2% 168916 ± 14% -5.4% 115628 ± 6% -1.3% 120623 ± 14% sched_debug.cpu_clk
120996 ± 8% +41.9% 171660 ± 7% +38.6% 167751 ± 15% -5.4% 114462 ± 6% -1.3% 119457 ± 14% sched_debug.ktime
123137 ± 8% +41.1% 173805 ± 7% +37.9% 169767 ± 14% -5.4% 116479 ± 6% -1.4% 121452 ± 13% sched_debug.sched_clk
>
> I spotted something else worth optimizing last time, and with the
> patch attached, I was able to measure some significant improvements in
> 1GB hugeTLB allocation and free time, e.g., when allocating and free
> 700 1GB hugeTLB pages:
>
> Before:
> # time echo 700 >/sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages
> real 0m13.500s
> user 0m0.000s
> sys 0m13.311s
>
> # time echo 0 >/sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages
> real 0m11.269s
> user 0m0.000s
> sys 0m11.187s
>
>
> After:
> # time echo 700 >/sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages
> real 0m10.643s
> user 0m0.001s
> sys 0m10.487s
>
> # time echo 0 >/sys/kernel/mm/hugepages/hugepages-1048576kB/nr_hugepages
> real 0m1.541s
> user 0m0.000s
> sys 0m1.528s
>
> Thanks!
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