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    SubjectRe: [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@gmail.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@67_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.

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