From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stewart Smith Subject: Re: [PATCH v3 0/2] cpufreq: powernv: Redesign the presentation of throttle notification Date: Wed, 06 Jan 2016 17:51:57 +1100 Message-ID: <877fjnjj3m.fsf@linux.vnet.ibm.com> References: <1451686914-3761-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> <1451899527-14359-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: Received: from e32.co.us.ibm.com ([32.97.110.150]:52131 "EHLO e32.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750845AbcAFGwX (ORCPT ); Wed, 6 Jan 2016 01:52:23 -0500 Received: from localhost by e32.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 5 Jan 2016 23:52:22 -0700 In-Reply-To: <1451899527-14359-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org Cc: viresh.kumar@linaro.org, rjw@rjwysocki.net, pc@us.ibm.com, Shilpasri G Bhat , linux-pm@vger.kernel.org Shilpasri G Bhat writes: > In POWER8, OCC(On-Chip-Controller) can throttle the frequency of the > CPU when the chip crosses its thermal and power limits. Currently, > powernv-cpufreq driver detects and reports this event as a console > message. Some boxes may not sustain the max turbo frequency in all > conditions and can be throttled frequently. This can lead to the > flooding of console with throttle messages. So this patchset aims to > redesign the presentation of this event via sysfs counters and > tracepoints. This likely should CC stable@ as we have seen this on some machines, at least in the lab. -- Stewart Smith OPAL Architect, IBM. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 604BB1A1176 for ; Wed, 6 Jan 2016 17:52:16 +1100 (AEDT) Received: from e38.co.us.ibm.com (e38.co.us.ibm.com [32.97.110.159]) (using TLSv1 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id A02271402C4 for ; Wed, 6 Jan 2016 17:52:15 +1100 (AEDT) Received: from localhost by e38.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 5 Jan 2016 23:52:13 -0700 Received: from b03cxnp08027.gho.boulder.ibm.com (b03cxnp08027.gho.boulder.ibm.com [9.17.130.19]) by d03dlp03.boulder.ibm.com (Postfix) with ESMTP id E6CCB19D803E for ; Tue, 5 Jan 2016 23:40:12 -0700 (MST) Received: from d03av02.boulder.ibm.com (d03av02.boulder.ibm.com [9.17.195.168]) by b03cxnp08027.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u066qANr28639344 for ; Tue, 5 Jan 2016 23:52:10 -0700 Received: from d03av02.boulder.ibm.com (localhost [127.0.0.1]) by d03av02.boulder.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u066qAxp020409 for ; Tue, 5 Jan 2016 23:52:10 -0700 From: Stewart Smith To: Shilpasri G Bhat , linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org Cc: viresh.kumar@linaro.org, rjw@rjwysocki.net, pc@us.ibm.com, Shilpasri G Bhat , linux-pm@vger.kernel.org Subject: Re: [PATCH v3 0/2] cpufreq: powernv: Redesign the presentation of throttle notification In-Reply-To: <1451899527-14359-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> References: <1451686914-3761-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> <1451899527-14359-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> Date: Wed, 06 Jan 2016 17:51:57 +1100 Message-ID: <877fjnjj3m.fsf@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Shilpasri G Bhat writes: > In POWER8, OCC(On-Chip-Controller) can throttle the frequency of the > CPU when the chip crosses its thermal and power limits. Currently, > powernv-cpufreq driver detects and reports this event as a console > message. Some boxes may not sustain the max turbo frequency in all > conditions and can be throttled frequently. This can lead to the > flooding of console with throttle messages. So this patchset aims to > redesign the presentation of this event via sysfs counters and > tracepoints. This likely should CC stable@ as we have seen this on some machines, at least in the lab. -- Stewart Smith OPAL Architect, IBM.