From mboxrd@z Thu Jan 1 00:00:00 1970 From: Shilpasri G Bhat Subject: [PATCH v3 0/2] cpufreq: powernv: Redesign the presentation of throttle notification Date: Mon, 4 Jan 2016 14:55:25 +0530 Message-ID: <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> Return-path: In-Reply-To: <1451686914-3761-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> Sender: linux-kernel-owner@vger.kernel.org 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, Shilpasri G Bhat List-Id: linux-pm@vger.kernel.org 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 patchset will add a perf trace point "power:powernv_throttle" and sysfs throttle counter stats in /sys/devices/system/cpu/cpufreq/chipN. 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 (2): cpufreq: powernv/tracing: Add powernv_throttle tracepoint cpufreq: powernv: Redesign the presentation of throttle notification drivers/cpufreq/powernv-cpufreq.c | 256 +++++++++++++++++++++++++++++++------- include/trace/events/power.h | 22 ++++ kernel/trace/power-traces.c | 1 + 3 files changed, 236 insertions(+), 43 deletions(-) -- 1.9.3