From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robert =?ISO-8859-1?Q?Sch=F6ne?= Subject: Re: [PATCH 1/2] cpufreq: serialize calls to __cpufreq_governor() Date: Fri, 10 Oct 2014 12:41:29 +0200 Message-ID: <1412937689.13463.21.camel@x200t> References: <54353223.7080704@redhat.com> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha-1"; protocol="application/x-pkcs7-signature"; boundary="=-LhCeLcasI0Ro0PQCfr6L" Return-path: Received: from mailout2.zih.tu-dresden.de ([141.30.67.73]:36161 "EHLO mailout2.zih.tu-dresden.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750950AbaJJKlo (ORCPT ); Fri, 10 Oct 2014 06:41:44 -0400 In-Reply-To: Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: Viresh Kumar Cc: Prarit Bhargava , "Rafael J. Wysocki" , Lists linaro-kernel , "linux-pm@vger.kernel.org" , Saravana Kannan --=-LhCeLcasI0Ro0PQCfr6L Content-Type: text/plain; charset="UTF-7" Content-Transfer-Encoding: quoted-printable +AD4 Robert/Prarit, +AD4=20 +AD4 I thought you guys would test this very quickly as it had been hanging= since +AD4 long time. What happened ? +AD4=20 +AD4 +AD4 Hey Viresh, this is on my plate for today. It does look like the= panic I sent +AD4 +AD4 you yesterday in email does occur when your patches are put into = the latest +AD4 +AD4 upstream kernel :(. +AD4=20 +AD4 I have tested my patches over mainline only, i.e. v3.17 . +AD4=20 +AD4 Even the branch I mentioned above is based on that. Hi, This patch makes it worse. Even when changing the governors sequentially for all CPUs, it fails. Here is what happens: 1. I boot the system. (performance) 2. An Ubuntu service enables ondemand sequentially for all cpus (ondemand) 3. I enable performance sequentially (performance) 4. I enable ondemand sequentially (broken) In the last step, ondemand can only be enabled at a single CPU. All others = return -EBUSY. More about step 3/4: +ACQ cat /sys/devices/system/cpu/cpu+ACo-/cpufreq/scaling+AF8-governor performance performance performance performance performance performance performance performance +ACQ echo ondemand +AHw sudo tee /sys/devices/system/cpu/cpu0/cpufreq/scali= ng+AF8-governor ondemand +ACQ echo ondemand +AHw sudo tee /sys/devices/system/cpu/cpu1/cpufreq/scali= ng+AF8-governor ondemand tee: /sys/devices/system/cpu/cpu1/cpufreq/scaling+AF8-governor: Device or r= esource busy Robert --=-LhCeLcasI0Ro0PQCfr6L Content-Type: application/x-pkcs7-signature; name="smime.p7s" Content-Disposition: attachment; filename="smime.p7s" Content-Transfer-Encoding: base64 MIAGCSqGSIb3DQEHAqCAMIACAQExCzAJBgUrDgMCGgUAMIAGCSqGSIb3DQEHAQAAoIIVkjCCBNUw ggO9oAMCAQICCFBOxvU9EbRkMA0GCSqGSIb3DQEBCwUAMHExCzAJBgNVBAYTAkRFMRwwGgYDVQQK ExNEZXV0c2NoZSBUZWxla29tIEFHMR8wHQYDVQQLExZULVRlbGVTZWMgVHJ1c3QgQ2VudGVyMSMw IQYDVQQDExpEZXV0c2NoZSBUZWxla29tIFJvb3QgQ0EgMjAeFw0xNDA3MjIxMjA4MjZaFw0xOTA3 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