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[23.128.96.18]) by mx.google.com with ESMTP id n21si1170938eja.402.2020.05.19.23.50.52; Tue, 19 May 2020 23:51:15 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=nosamNqg; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726632AbgETGsX (ORCPT + 99 others); Wed, 20 May 2020 02:48:23 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40464 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726475AbgETGsW (ORCPT ); Wed, 20 May 2020 02:48:22 -0400 Received: from mail-pf1-x42e.google.com (mail-pf1-x42e.google.com [IPv6:2607:f8b0:4864:20::42e]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 937E9C061A0E for ; Tue, 19 May 2020 23:48:22 -0700 (PDT) Received: by mail-pf1-x42e.google.com with SMTP id x13so1083355pfn.11 for ; Tue, 19 May 2020 23:48:22 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=n1H7Tg2fQowOdnYnpiSDR4cBo8OXspCb45EM5CNo114=; b=nosamNqgvZ5i9YmM1K5t9D6CYJREYtDBGOFtJoC65I/5FWfbhGIyvqn2875FpkcAb1 gBchnkXDaIC2XsY0dJ3G385VUh0NxjUlHVTfV8ETseo9SdPicrKvBUaoPxdVHAh3nsZH xn0ZyZ4mGVOiRafnAmYDvbZ+UuFREbHTwmy4K1D5WYtkwZCuVPJQrrJljKgKh55lnbZY dtkh+fe+ISVbw9gNI7fm/4fC9z8cIO/81MbI+7KmnxqAODiFbtnSCiB5zD95wPnZ3Z7k x0YOpYGjL2tZ+brHUWjBe3+byW/4l99dyxTa16eWE1rdwthsJ6XOY/ebqNW5Nmel3dp0 hdBw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=n1H7Tg2fQowOdnYnpiSDR4cBo8OXspCb45EM5CNo114=; b=O9V7Klu2TrnlUj11Rpoiph00NRTPYfV6vphs6fTpS2BdvSCUTQURiwk+CMpiPWzFI9 eyHSOH7l0JWdWYZh0zgLbXIJZxO4F7tKiEAe3ZAbx1hx06+mwAoSOcYjgg3WEsDRAOi4 mVQUnCTl/Gc76JLLjj2RbXZ25QZvxLeG4pqTzj2ef3UlJF7YkFmAkEAv4I/PvEYXaKZD vGvITQj1R+ICG402x+bNvZ+KHn0t0yL3/GMnYdtIhfNQ1QU2o71acdRtQ0+pJ4rqGisj 7bCaA1Q2DipejAL3+XFbvWxADs1OnHQeE5dJ20NRexU8xLuo3JaTyCN4pBaFbIMBrpTb 9I7A== X-Gm-Message-State: AOAM531nim6CJVAx0Mnc58BQUSLI/vheGUfFgYYXpQCRzLBMwJUe+AaM tTYw3E6GeFMwaJWCkhZQWV2CPipIV+i8D0G5e4ZSTlP8fxvN1A== X-Received: by 2002:a63:5506:: with SMTP id j6mr2777011pgb.121.1589957301215; Tue, 19 May 2020 23:48:21 -0700 (PDT) MIME-Version: 1.0 From: Feng Li Date: Wed, 20 May 2020 14:47:54 +0800 Message-ID: Subject: [ISSUE] acpi_cpufreq is added and removed frequently To: linux-kernel Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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.