From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752055AbcAFGw0 (ORCPT ); Wed, 6 Jan 2016 01:52:26 -0500 Received: from e32.co.us.ibm.com ([32.97.110.150]:52130 "EHLO e32.co.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751106AbcAFGwX (ORCPT ); Wed, 6 Jan 2016 01:52:23 -0500 X-IBM-Helo: d03dlp03.boulder.ibm.com X-IBM-MailFrom: stewart@linux.vnet.ibm.com X-IBM-RcptTo: linux-kernel@vger.kernel.org;linux-pm@vger.kernel.org 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> User-Agent: Notmuch/0.21+24~gbceb651 (http://notmuchmail.org) Emacs/24.5.1 (x86_64-redhat-linux-gnu) 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 X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 16010606-0005-0000-0000-00001B2BE30D Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@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.