linux-kernel - Re: [PATCH v7 0/6] cpufreq: powernv: Redesign the presentation of throttle notification and solve bug-fixes in the driver

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Message-ID: <CAKTCnzn6o6fxP+f4FzsBr3+F9_cBubtUs6sQZod0A6BWdBZzmA@mail.gmail.com>
Date:	Thu, 28 Jan 2016 22:10:57 +1100
From:	Balbir Singh <bsingharora@...il.com>
To:	Shilpasri G Bhat <shilpa.bhat@...ux.vnet.ibm.com>
Cc:	linuxppc-dev@...abs.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	rjw@...ysocki.net, viresh.kumar@...aro.org,
	linux-pm@...r.kernel.org, pc@...ibm.com,
	Anton Blanchard <anton@...ba.org>,
	Gautham R Shenoy <ego@...ux.vnet.ibm.com>,
	shreyas@...ux.vnet.ibm.com, mpe@...erman.id.au
Subject: Re: [PATCH v7 0/6] cpufreq: powernv: Redesign the presentation of
 throttle notification and solve bug-fixes in the driver

On Thu, Jan 28, 2016 at 6:25 PM, Shilpasri G Bhat
<shilpa.bhat@...ux.vnet.ibm.com> wrote:
> 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 a memory leak bug
> - Patch [2] fixes the cpu hot-plug bug in powernv_cpufreq_work_fn().
> - Patch [3] 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 [4] to [6] will add a perf trace point
>   "power:powernv_throttle" and sysfs throttle counter stats in
>   /sys/devices/system/cpu/cpufreq/chipN.
>

Looks good to me. You've got the reviews and acks you need.

Balbir Singh