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 5EF211A060B for ; Fri, 22 Jan 2016 18:20:04 +1100 (AEDT) Received: from e23smtp05.au.ibm.com (e23smtp05.au.ibm.com [202.81.31.147]) (using TLSv1 with cipher CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 36D3E1402DE for ; Fri, 22 Jan 2016 18:20:04 +1100 (AEDT) Received: from localhost by e23smtp05.au.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Fri, 22 Jan 2016 17:20:02 +1000 Received: from d23relay06.au.ibm.com (d23relay06.au.ibm.com [9.185.63.219]) by d23dlp01.au.ibm.com (Postfix) with ESMTP id DA16D2CE802D for ; Fri, 22 Jan 2016 18:19:58 +1100 (EST) Received: from d23av01.au.ibm.com (d23av01.au.ibm.com [9.190.234.96]) by d23relay06.au.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id u0M7Je3J34668702 for ; Fri, 22 Jan 2016 18:19:48 +1100 Received: from d23av01.au.ibm.com (localhost [127.0.0.1]) by d23av01.au.ibm.com (8.14.4/8.14.4/NCO v10.0 AVout) with ESMTP id u0M7JQqu023224 for ; Fri, 22 Jan 2016 18:19:26 +1100 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 v6 0/5] cpufreq: powernv: Redesign the presentation of throttle notification and solve bug-fixes in the driver Date: Fri, 22 Jan 2016 12:49:00 +0530 Message-Id: <1453447145-17722-1-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. And it also fixes couple of bugs reported in the driver. - Patch [1] fixes the cpu hot-plug bug in powernv_cpufreq_work_fn(). - Patch [2] 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. - Patches [3] to [5] will add a perf trace point "power:powernv_throttle" and sysfs throttle counter stats in /sys/devices/system/cpu/cpufreq/chipN. Changes from v5: - Fix kbuild error: drivers/cpufreq/powernv-cpufreq.c:428:2: error: implicit declaration of function 'get_online_cpus' [-Werror=implicit-function-declaration] Changes from v4: - Fix a hot-plug bug in powernv_cpufreq_work_fn() - Changes wrt Gautham's and Shreyas's comments 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 (5): cpufreq: powernv: Hot-plug safe the kworker thread cpufreq: powernv: Remove cpu_to_chip_id() from hot-path cpufreq: powernv/tracing: Add powernv_throttle tracepoint cpufreq: powernv: Replace pr_info with trace print for throttle event cpufreq: powernv: Add sysfs attributes to show throttle stats drivers/cpufreq/powernv-cpufreq.c | 313 +++++++++++++++++++++++++++++++------- include/trace/events/power.h | 22 +++ kernel/trace/power-traces.c | 1 + 3 files changed, 281 insertions(+), 55 deletions(-) -- 1.9.3