linux-kernel - Re: [PATCH v4 0/5] Simplify hotplug/suspend handling

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Message-ID: <1667655.2j1xLy7HXa@vostro.rjw.lan>
Date:	Wed, 30 Jul 2014 02:29:11 +0200
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Saravana Kannan <skannan@...eaurora.org>
Cc:	Viresh Kumar <viresh.kumar@...aro.org>,
	Todd Poynor <toddpoynor@...gle.com>,
	"Srivatsa S . Bhat" <srivatsa@....edu>, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	Stephen Boyd <sboyd@...eaurora.org>
Subject: Re: [PATCH v4 0/5] Simplify hotplug/suspend handling

On Thursday, July 24, 2014 06:07:23 PM Saravana Kannan wrote:
> Series of patchs to simplify policy/sysfs/kobj/locking handling across
> suspend/resume

I need someone to review this series for me.  Viresh or Srivatsa, preferably
both.

Thanks!

> The following have been tested so far on a 2x2 cluster environment:
> - Boot with 2 cpus and no cpufreq driver.
> - mod probe driver and see cpufreq sysfs files show up only for the 1st cluster.
> - Online the rest of the 2 CPUs and have files show up correctly.
> - rmmod the driver and see the files go away.
> - modprobe again (or back and forth multiples times) and see it work.
> - suspend/resume works as expected.
> - When a cluster is offline, all read/writes to its sysfs files return an error
> 
> v4
> - Split it up into smaller patches
> - Will handle physical CPU removal correctly
> - Fixed earlier mistake of deleting code under !recover_policy
> - Dropped some code refactor that reuses a lot of code between add/remove
> - Dropped fix for exiting hotplug race with cpufreq driver probe/rmmod
> - Dropped changes will come later once this series is acked.
> 
> 
> Saravana Kannan (5):
>   cpufreq: Don't wait for CPU to going offline to restart governor
>   cpufreq: Keep track of which CPU owns the kobj/sysfs nodes separately
>   cpufreq: Don't destroy/realloc policy/sysfs on hotplug/suspend
>   cpufreq: Properly handle physical CPU hot-add/hot-remove
>   cpufreq: Delete dead code related to policy save/restore
> 
>  drivers/cpufreq/cpufreq.c | 238 ++++++++++++++++++----------------------------
>  include/linux/cpufreq.h   |   1 +
>  2 files changed, 93 insertions(+), 146 deletions(-)
> 
> 

-- 
I speak only for myself.
Rafael J. Wysocki, Intel Open Source Technology Center.
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