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 40EC11A17EB for ; Tue, 12 Jan 2016 21:26:40 +1100 (AEDT) Received: from e28smtp02.in.ibm.com (e28smtp02.in.ibm.com [125.16.236.2]) (using TLSv1 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 7F6F7140297 for ; Tue, 12 Jan 2016 21:26:39 +1100 (AEDT) Received: from localhost by e28smtp02.in.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 12 Jan 2016 15:56:36 +0530 Received: from d28relay04.in.ibm.com (d28relay04.in.ibm.com [9.184.220.61]) by d28dlp01.in.ibm.com (Postfix) with ESMTP id B1F22E0066 for ; Tue, 12 Jan 2016 15:57:52 +0530 (IST) Received: from d28av04.in.ibm.com (d28av04.in.ibm.com [9.184.220.66]) by d28relay04.in.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u0CAQKwe59375666 for ; Tue, 12 Jan 2016 15:56:21 +0530 Received: from d28av04.in.ibm.com (localhost [127.0.0.1]) by d28av04.in.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u0CAQJIj020867 for ; Tue, 12 Jan 2016 15:56:19 +0530 From: Shilpasri G Bhat To: linuxppc-dev@ozlabs.org, linux-kernel@vger.kernel.org Cc: rjw@rjwysocki.net, viresh.kumar@linaro.org, linux-pm@vger.kernel.org, pc@us.ibm.com, anton@samba.org, ego@linux.vnet.ibm.com, shreyas@linux.vnet.ibm.com, Shilpasri G Bhat Subject: [PATCH RESEND v4 0/4] cpufreq: powernv: Redesign the presentation of throttle notification Date: Tue, 12 Jan 2016 04:24:23 -0600 Message-Id: <1452594267-12844-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , 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 machines 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. Patches [2] to [4] will add a perf trace point "power:powernv_throttle" and sysfs throttle counter stats in /sys/devices/system/cpu/cpufreq/chipN. Patch [1] solves a bug in powernv_cpufreq_throttle_check(), which calls in to cpu_to_chip_id() in hot path which reads DT every time to find the chip id. Resending the patchset as I has cc'ed stable@vger.kernel.org in developemnt cycle and used --in-reply-to to post a new version. Changes from v3: - Add a fix to replace cpu_to_chip_id() with simpler PIR shift to obtain the chip id. - Break patch2 in to two patches separating the tracepoint and sysfs attribute changes. Changes from v2: - Fixed kbuild test warning. drivers/cpufreq/powernv-cpufreq.c:609:2: warning: ignoring return value of 'kstrtoint', declared with attribute warn_unused_result [-Wunused-result] Shilpasri G Bhat (4): cpufreq: powernv: Remove cpu_to_chip_id() from hot-path cpufreq: powernv/tracing: Add powernv_throttle tracepoint cpufreq: powernv: Add a trace print for the throttle event cpufreq: powernv: Add sysfs attributes to show throttle stats drivers/cpufreq/powernv-cpufreq.c | 279 +++++++++++++++++++++++++++++++------- include/trace/events/power.h | 22 +++ kernel/trace/power-traces.c | 1 + 3 files changed, 250 insertions(+), 52 deletions(-) -- 1.9.1