From: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
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, <stable@vger.kernel.org>,
Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com>
Subject: [PATCH v4 0/4] cpufreq: powernv: Redesign the presentation of throttle notification
Date: Mon, 11 Jan 2016 14:54:36 -0600 [thread overview]
Message-ID: <1452545680-11976-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com> (raw)
In-Reply-To: <1451899527-14359-1-git-send-email-shilpa.bhat@linux.vnet.ibm.com>
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.
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
next prev parent reply other threads:[~2016-01-11 20:56 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-01 22:21 [PATCH v2 0/2] cpufreq: powernv: Redesign the presentation of throttle notification Shilpasri G Bhat
2016-01-01 22:21 ` [PATCH v2 1/2] cpufreq: powernv/tracing: Add powernv_throttle tracepoint Shilpasri G Bhat
2016-01-01 22:21 ` [PATCH v2 2/2] cpufreq: powernv: Redesign the presentation of throttle notification Shilpasri G Bhat
2016-01-01 23:01 ` kbuild test robot
2016-01-02 2:08 ` kbuild test robot
2016-01-04 9:25 ` [PATCH v3 0/2] " Shilpasri G Bhat
2016-01-04 9:25 ` [PATCH v3 1/2] cpufreq: powernv/tracing: Add powernv_throttle tracepoint Shilpasri G Bhat
2016-01-04 9:25 ` [PATCH v3 2/2] cpufreq: powernv: Redesign the presentation of throttle notification Shilpasri G Bhat
2016-01-06 6:51 ` [PATCH v3 0/2] " Stewart Smith
2016-01-11 20:54 ` Shilpasri G Bhat [this message]
2016-01-11 20:54 ` [PATCH v4 1/4] cpufreq: powernv: Remove cpu_to_chip_id() from hot-path Shilpasri G Bhat
2016-01-11 20:54 ` [PATCH v4 2/4] cpufreq: powernv/tracing: Add powernv_throttle tracepoint Shilpasri G Bhat
2016-01-11 20:54 ` [PATCH v4 3/4] cpufreq: powernv: Add a trace print for the throttle event Shilpasri G Bhat
2016-01-11 20:54 ` [PATCH v4 4/4] cpufreq: powernv: Add sysfs attributes to show throttle stats Shilpasri G Bhat
2016-01-11 22:23 ` [PATCH v4 0/4] cpufreq: powernv: Redesign the presentation of throttle notification Greg KH
2016-01-12 2:32 ` Viresh Kumar
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