From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.4 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 629E6C4338F for ; Thu, 29 Jul 2021 14:38:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 41A3E6103B for ; Thu, 29 Jul 2021 14:38:30 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237475AbhG2Oic (ORCPT ); Thu, 29 Jul 2021 10:38:32 -0400 Received: from foss.arm.com ([217.140.110.172]:49488 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237458AbhG2OiS (ORCPT ); Thu, 29 Jul 2021 10:38:18 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 7A0396D; Thu, 29 Jul 2021 07:38:12 -0700 (PDT) Received: from [192.168.178.6] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 7A8EE3F70D; Thu, 29 Jul 2021 07:38:11 -0700 (PDT) Subject: Re: WARNING: CPU: 112 PID: 2041 at kernel/sched/sched.h:1453 To: Bruno Goncalves Cc: CKI Project , linux-kernel@vger.kernel.org, nathan@kernel.org, Memory Management , linux-arm-kernel@lists.infradead.org References: From: Dietmar Eggemann Message-ID: Date: Thu, 29 Jul 2021 16:38:10 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 29/07/2021 14:36, Bruno Goncalves wrote: > On Wed, Jul 28, 2021 at 5:55 PM Dietmar Eggemann > wrote: >> >> On 28/07/2021 15:11, Bruno Goncalves wrote: [...] >> Can't reproduce it on my Juno (arm64) (slow-switching (scpi-cpufreq >> driver)). > > We seem to be able to reproduce this only on Ampere Altra machines, > specifically on mtjade and mtsnow cpus. > > # cpupower frequency-info > analyzing CPU 0: > driver: cppc_cpufreq > CPUs which run at the same hardware frequency: 0 > CPUs which need to have their frequency coordinated by software: 0 > maximum transition latency: Cannot determine or is not supported. > hardware limits: 1000 MHz - 2.80 GHz > available cpufreq governors: conservative ondemand userspace > powersave performance schedutil > current policy: frequency should be within 2.00 GHz and 2.80 GHz. > The governor "schedutil" may decide which speed to use > within this range. > current CPU frequency: 1.55 GHz (asserted by call to hardware) > > # ps -eTo comm,pid,pri,class | grep sugov > sugov:0 1082 140 DLN > sugov:1 1085 140 DLN > ... > sugov:78 1319 140 DLN > sugov:79 1320 140 DLN Thanks! In the meantime I got access to an Ampere Altra so I can try 5.14.0-rc1 later today. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B622FC4338F for ; Thu, 29 Jul 2021 14:40:57 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 8547A601FC for ; Thu, 29 Jul 2021 14:40:57 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.4.1 mail.kernel.org 8547A601FC Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:Date: Message-ID:From:References:Cc:To:Subject:Reply-To:Content-ID: Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc :Resent-Message-ID:List-Owner; bh=Yx7/KxPk012iFgWH5SyA+WkcwksLL+y0kXk5+JbuTtE=; b=IgELMsu0y4QZVBM5KkyvgBVqXl sGpfJxJSpAlR7g2O3i53uun4I0hcCMPKtym3jZxLSTyfStpSUfXcIE2X5Ki58hP5rSS6knjUkXEdf y3GGVd7nnR4amdc7Ad92hL1pCKmsAUstb6j+p1+HQbL3r/GyIVwxOixKEQp+YYp65lzpG7qByu6EF ErTer63avQNwTg5AEKNMSlVJusIqkMrUyegHXuzvYowLP9AEGJSbNl65mVIekoVQjehPtGQuLCkzX CKPnMAu6hJ3h1eToDzla3n9/1M8NUwLJV+1QHSBP6gMYr6RFS/Gglh8TiVnbaKI6SvWKJecgl6mel lSX/bseA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m97Az-004YXA-5z; Thu, 29 Jul 2021 14:38:21 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1m97Av-004YWi-5Y for linux-arm-kernel@lists.infradead.org; Thu, 29 Jul 2021 14:38:18 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 7A0396D; Thu, 29 Jul 2021 07:38:12 -0700 (PDT) Received: from [192.168.178.6] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 7A8EE3F70D; Thu, 29 Jul 2021 07:38:11 -0700 (PDT) Subject: Re: WARNING: CPU: 112 PID: 2041 at kernel/sched/sched.h:1453 To: Bruno Goncalves Cc: CKI Project , linux-kernel@vger.kernel.org, nathan@kernel.org, Memory Management , linux-arm-kernel@lists.infradead.org References: From: Dietmar Eggemann Message-ID: Date: Thu, 29 Jul 2021 16:38:10 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.11.0 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210729_073817_310490_C6A021EF X-CRM114-Status: GOOD ( 13.32 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 29/07/2021 14:36, Bruno Goncalves wrote: > On Wed, Jul 28, 2021 at 5:55 PM Dietmar Eggemann > wrote: >> >> On 28/07/2021 15:11, Bruno Goncalves wrote: [...] >> Can't reproduce it on my Juno (arm64) (slow-switching (scpi-cpufreq >> driver)). > > We seem to be able to reproduce this only on Ampere Altra machines, > specifically on mtjade and mtsnow cpus. > > # cpupower frequency-info > analyzing CPU 0: > driver: cppc_cpufreq > CPUs which run at the same hardware frequency: 0 > CPUs which need to have their frequency coordinated by software: 0 > maximum transition latency: Cannot determine or is not supported. > hardware limits: 1000 MHz - 2.80 GHz > available cpufreq governors: conservative ondemand userspace > powersave performance schedutil > current policy: frequency should be within 2.00 GHz and 2.80 GHz. > The governor "schedutil" may decide which speed to use > within this range. > current CPU frequency: 1.55 GHz (asserted by call to hardware) > > # ps -eTo comm,pid,pri,class | grep sugov > sugov:0 1082 140 DLN > sugov:1 1085 140 DLN > ... > sugov:78 1319 140 DLN > sugov:79 1320 140 DLN Thanks! In the meantime I got access to an Ampere Altra so I can try 5.14.0-rc1 later today. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel