From: Saravana Kannan <skannan@codeaurora.org>
To: Prarit Bhargava <prarit@redhat.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
linux-kernel@vger.kernel.org,
Viresh Kumar <viresh.kumar@linaro.org>,
Lenny Szubowicz <lszubowi@redhat.com>,
linux-pm@vger.kernel.org
Subject: Re: [PATCH] cpufreq, store_scaling_governor requires policy->rwsem to be held for duration of changing governors [v2]
Date: Thu, 31 Jul 2014 13:38:51 -0700 [thread overview]
Message-ID: <53DAA95B.2040505@codeaurora.org> (raw)
In-Reply-To: <53DAA749.5080506@redhat.com>
On 07/31/2014 01:30 PM, Prarit Bhargava wrote:
>
>
> On 07/31/2014 04:24 PM, Saravana Kannan wrote:
>>
>> Prarit,
>>
>> I'm not an expert on sysfs locking, but I would think the specific sysfs lock
>> would depend on the file/attribute group. So, can you please try to hotplug a
>> core in/out (to trigger the POLICY_EXIT) and then read a sysfs file exported by
>> the governor? scaling_governor doesn't cut it since that file is not removed on
>> policy exit event to governor. If it's ondemand, try reading/write it's sampling
>> rate file.
>
> Thanks Saravana -- will do. I will get back to you shortly on this.
>
Thanks. Btw, in case you weren't already aware of it. You'll have to
hoplug out all the CPUs in a cluster to trigger a POLICY_EXIT for that
cluster/policy.
-Saravana
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation
next prev parent reply other threads:[~2014-07-31 20:38 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-07-29 11:46 [PATCH] cpufreq, store_scaling_governor requires policy->rwsem to be held for duration of changing governors [v2] Prarit Bhargava
2014-07-30 0:03 ` Rafael J. Wysocki
2014-07-30 14:18 ` Prarit Bhargava
2014-07-30 21:40 ` Rafael J. Wysocki
2014-07-31 1:36 ` Saravana Kannan
2014-07-31 2:16 ` Rafael J. Wysocki
2014-07-31 2:07 ` Saravana Kannan
2014-07-31 10:16 ` Prarit Bhargava
2014-07-31 10:21 ` Prarit Bhargava
2014-07-31 10:23 ` Prarit Bhargava
2014-07-31 16:36 ` Rafael J. Wysocki
2014-07-31 17:57 ` Prarit Bhargava
2014-07-31 18:38 ` Rafael J. Wysocki
2014-07-31 18:26 ` Prarit Bhargava
2014-07-31 20:24 ` Saravana Kannan
2014-07-31 20:30 ` Prarit Bhargava
2014-07-31 20:38 ` Saravana Kannan [this message]
2014-07-31 21:08 ` Prarit Bhargava
2014-07-31 22:13 ` Saravana Kannan
2014-07-31 22:58 ` Prarit Bhargava
2014-08-01 0:55 ` Saravana Kannan
2014-08-01 10:24 ` Prarit Bhargava
2014-08-01 10:27 ` Prarit Bhargava
2014-08-01 17:18 ` Stephen Boyd
2014-08-01 19:15 ` Prarit Bhargava
2014-08-01 19:36 ` Stephen Boyd
2014-08-01 19:43 ` Prarit Bhargava
2014-08-01 19:54 ` Stephen Boyd
2014-08-01 21:25 ` Saravana Kannan
2014-08-04 10:11 ` Prarit Bhargava
2014-08-05 7:46 ` Viresh Kumar
2014-08-05 10:47 ` Prarit Bhargava
2014-08-05 10:53 ` Viresh Kumar
2014-08-05 22:06 ` Saravana Kannan
2014-08-05 22:20 ` Prarit Bhargava
2014-08-05 22:40 ` Saravana Kannan
2014-08-05 22:42 ` Prarit Bhargava
2014-08-05 22:51 ` Saravana Kannan
2014-08-13 19:57 ` Prarit Bhargava
2014-08-13 19:57 ` Prarit Bhargava
2014-08-14 18:16 ` Saravana Kannan
2014-08-14 18:16 ` Saravana Kannan
2014-08-06 8:10 ` Viresh Kumar
2014-08-06 10:09 ` Prarit Bhargava
2014-08-06 10:09 ` Prarit Bhargava
2014-08-06 15:08 ` Stephen Boyd
2014-08-07 6:36 ` Viresh Kumar
2014-08-07 10:12 ` Prarit Bhargava
2014-08-07 10:15 ` Viresh Kumar
2014-08-12 9:03 ` Viresh Kumar
2014-08-12 11:33 ` Prarit Bhargava
2014-08-13 7:39 ` Viresh Kumar
2014-08-13 9:58 ` Prarit Bhargava
2014-08-13 9:58 ` Prarit Bhargava
2014-08-14 4:19 ` Viresh Kumar
2014-08-04 10:36 ` Viresh Kumar
2014-08-04 12:25 ` Prarit Bhargava
2014-08-04 13:38 ` Viresh Kumar
2014-08-04 14:00 ` Prarit Bhargava
2014-08-04 15:04 ` Prarit Bhargava
2014-08-04 20:16 ` Saravana Kannan
2014-08-05 6:14 ` Viresh Kumar
2014-08-05 6:29 ` skannan
2014-08-05 6:43 ` Viresh Kumar
2014-10-13 10:43 ` Viresh Kumar
2014-10-13 11:52 ` Prarit Bhargava
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