linux-kernel - Re: [ISSUE] acpi_cpufreq is added and removed frequently

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Date:   Wed, 20 May 2020 16:49:43 +0800
From:   Feng Li <lifeng1519@...il.com>
To:     linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [ISSUE] acpi_cpufreq is added and removed frequently

Oh, the trouble maker has been found.
A background program call 'udevadm retrigger' periodically.
Closed.

Feng Li <lifeng1519@...il.com> 于2020年5月20日周三 下午2:47写道：
>
> Hi expert,
>
> I could see my CentOS7,  `udevadm monitor` reports this log very fast:
>
> UDEV  [14258.464055] change
> /devices/LNXSYSTM:00/device:00/ACPI0004:01/LNXCPU:4d (acpi)
> KERNEL[14258.464065] add      /module/acpi_cpufreq (module)
> KERNEL[14258.471130] remove   /module/acpi_cpufreq (module)
> UDEV  [14258.473672] change
> /devices/LNXSYSTM:00/device:00/ACPI0004:01/LNXCPU:4a (acpi)
> KERNEL[14258.473684] add      /module/acpi_cpufreq (module)
> KERNEL[14258.482001] remove   /module/acpi_cpufreq (module)
> UDEV  [14258.485059] change
> /devices/LNXSYSTM:00/device:00/ACPI0004:01/LNXCPU:4f (acpi)
> KERNEL[14258.485070] add      /module/acpi_cpufreq (module)
> KERNEL[14258.495195] remove   /module/acpi_cpufreq (module)
>
>
> What's wrong with the system?
>
> OS: CentOS 7.6
> Kernel: 3.10.0-1062.1.2.el7 / kernel-4.18.0-147
>
> [root@...95 14:46:21 ~]$lscpu
> Architecture:          x86_64
> CPU op-mode(s):        32-bit, 64-bit
> Byte Order:            Little Endian
> CPU(s):                16
> On-line CPU(s) list:   0-15
> Thread(s) per core:    2
> Core(s) per socket:    4
> Socket(s):             2
> NUMA node(s):          2
> Vendor ID:             GenuineIntel
> CPU family:            6
> Model:                 85
> Model name:            Intel(R) Xeon(R) Gold 5122 CPU @ 3.60GHz
> Stepping:              4
> CPU MHz:               3677.124
> CPU max MHz:           3700.0000
> CPU min MHz:           1200.0000
> BogoMIPS:              7200.00
> Virtualization:        VT-x
> L1d cache:             32K
> L1i cache:             32K
> L2 cache:              1024K
> L3 cache:              16896K
> NUMA node0 CPU(s):     0,2,4,6,8,10,12,14
> NUMA node1 CPU(s):     1,3,5,7,9,11,13,15
> Flags:                 fpu vme de pse tsc msr pae mce cx8 apic sep
> mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht
> tm pbe syscall nx pdpe1gb rdtscp lm constant_tsc art arch_perfmon pebs
> bts rep_good nopl xtopology nonstop_tsc aperfmperf eagerfpu pni
> pclmulqdq dtes64 monitor ds_cpl vmx smx est tm2 ssse3 sdbg fma cx16
> xtpr pdcm pcid dca sse4_1 sse4_2 x2apic movbe popcnt
> tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm 3dnowprefetch
> epb cat_l3 cdp_l3 invpcid_single intel_ppin intel_pt ssbd mba ibrs
> ibpb stibp tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust
> bmi1 hle avx2 smep bmi2 erms invpcid rtm cqm mpx rdt_a avx512f
> avx512dq rdseed adx smap clflushopt clwb avx512cd avx512bw avx512vl
> xsaveopt xsavec xgetbv1 cqm_llc cqm_occup_llc cqm_mbm_total
> cqm_mbm_local dtherm ida arat pln pts pku ospke spec_ctrl intel_stibp
> flush_l1d
>
> Any tips?
> Thanks in advance.