From: Juri Lelli <juri.lelli@arm.com>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Rafael Wysocki <rjw@rjwysocki.net>,
linaro-kernel@lists.linaro.org, linux-pm@vger.kernel.org,
skannan@codeaurora.org, peterz@infradead.org,
mturquette@baylibre.com, steve.muckle@linaro.org,
vincent.guittot@linaro.org, morten.rasmussen@arm.com,
dietmar.eggemann@arm.com, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 0/5] cpufreq: governors: Solve the ABBA lockups
Date: Tue, 2 Feb 2016 11:25:11 +0000 [thread overview]
Message-ID: <20160202112511.GB3947@e106622-lin> (raw)
In-Reply-To: <cover.1454410226.git.viresh.kumar@linaro.org>
Hi Viresh,
On 02/02/16 16:27, Viresh Kumar wrote:
> Hi Rafael,
>
> Sorry for doing this, I know you were also looking to fix this in a
> possibly different way. But I thought, it would be better if we fix
> that. We can scrap this version and take yours if that looks better.
>
> The root cause of all the issues we were facing, was that we were taking
> policy->rwsem while accessing governor sysfs attributes. And that
> happened because we were sharing the show/store calls present in
> cpufreq.c.
>
> I thought, perhaps the best way to fix it is to give separate sysfs-ops
> to governors. And that's what I did.
>
> @Juri: I need your help in testing these. My platform doesn't give me
> those lockups (even without these patches) and Juno/Tc2 would fit
> better.
>
> Can you please run some tests on these?
>
Sure! Will do in the next few days.
Best,
- Juri
> They are pushed here for easy access (and auto test by build-bot):
> git://git.kernel.org/pub/scm/linux/kernel/git/vireshk/pm.git cpufreq/governor-kobject
>
> --
> viresh
>
> Viresh Kumar (5):
> cpufreq: governor: Kill declare_show_sampling_rate_min()
> cpufreq: governor: Create separate sysfs-ops
> cpufreq: governor: Remove unused sysfs attribute macros
> cpufreq: Don't drop rwsem before calling CPUFREQ_GOV_POLICY_EXIT
> cpufreq: Get rid of ->governor_enabled and its lock
>
> drivers/cpufreq/cpufreq.c | 29 ----------
> drivers/cpufreq/cpufreq_conservative.c | 77 ++++++++++---------------
> drivers/cpufreq/cpufreq_governor.c | 86 ++++++++++++++++++++--------
> drivers/cpufreq/cpufreq_governor.h | 101 +++++++--------------------------
> drivers/cpufreq/cpufreq_ondemand.c | 77 ++++++++++---------------
> include/linux/cpufreq.h | 5 --
> 6 files changed, 143 insertions(+), 232 deletions(-)
>
> --
> 2.7.0.79.gdc08a19
>
next prev parent reply other threads:[~2016-02-02 11:24 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-02 10:57 [PATCH 0/5] cpufreq: governors: Solve the ABBA lockups Viresh Kumar
2016-02-02 10:57 ` [PATCH 1/5] cpufreq: governor: Kill declare_show_sampling_rate_min() Viresh Kumar
2016-02-02 20:23 ` Rafael J. Wysocki
2016-02-03 2:29 ` Viresh Kumar
2016-02-02 10:57 ` [PATCH 2/5] cpufreq: governor: Create separate sysfs-ops Viresh Kumar
2016-02-02 15:47 ` Juri Lelli
2016-02-02 16:35 ` Rafael J. Wysocki
2016-02-02 17:01 ` Juri Lelli
2016-02-02 19:40 ` Rafael J. Wysocki
2016-02-02 22:21 ` Saravana Kannan
2016-02-02 23:42 ` Rafael J. Wysocki
2016-02-03 1:07 ` Rafael J. Wysocki
2016-02-03 1:32 ` Saravana Kannan
2016-02-03 1:52 ` Rafael J. Wysocki
2016-02-03 4:03 ` Saravana Kannan
2016-02-03 6:57 ` Viresh Kumar
2016-02-03 20:07 ` Saravana Kannan
2016-02-03 6:54 ` Viresh Kumar
2016-02-03 10:51 ` Juri Lelli
2016-02-03 10:55 ` Viresh Kumar
2016-02-03 20:14 ` Saravana Kannan
2016-02-03 6:51 ` Viresh Kumar
2016-02-03 6:33 ` Viresh Kumar
2016-02-02 21:23 ` Rafael J. Wysocki
2016-02-03 6:58 ` Viresh Kumar
2016-02-03 12:42 ` Rafael J. Wysocki
2016-02-03 13:21 ` Viresh Kumar
2016-02-03 13:38 ` Rafael J. Wysocki
2016-02-02 10:57 ` [PATCH 3/5] cpufreq: governor: Remove unused sysfs attribute macros Viresh Kumar
2016-02-02 21:34 ` Rafael J. Wysocki
2016-02-02 10:57 ` [PATCH 4/5] cpufreq: Don't drop rwsem before calling CPUFREQ_GOV_POLICY_EXIT Viresh Kumar
2016-02-02 21:53 ` Rafael J. Wysocki
2016-02-03 5:51 ` Viresh Kumar
2016-02-03 12:24 ` Rafael J. Wysocki
2016-02-03 13:09 ` Viresh Kumar
2016-02-02 10:57 ` [PATCH 5/5] cpufreq: Get rid of ->governor_enabled and its lock Viresh Kumar
2016-02-02 16:49 ` Juri Lelli
2016-02-03 6:05 ` Viresh Kumar
2016-02-03 11:05 ` Juri Lelli
2016-02-03 11:08 ` Viresh Kumar
2016-02-02 21:57 ` Rafael J. Wysocki
2016-02-02 11:25 ` Juri Lelli [this message]
2016-02-02 20:04 ` [PATCH 0/5] cpufreq: governors: Solve the ABBA lockups Rafael J. Wysocki
2016-02-03 2:22 ` Viresh Kumar
2016-02-03 11:37 ` Viresh Kumar
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