From: Prarit Bhargava <prarit@redhat.com>
To: Viresh Kumar <viresh.kumar@linaro.org>
Cc: Stephen Boyd <sboyd@codeaurora.org>,
Saravana Kannan <skannan@codeaurora.org>,
"Rafael J. Wysocki" <rjw@rjwysocki.net>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Lenny Szubowicz <lszubowi@redhat.com>,
"linux-pm@vger.kernel.org" <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: Mon, 13 Oct 2014 07:52:10 -0400 [thread overview]
Message-ID: <543BBCEA.4080202@redhat.com> (raw)
In-Reply-To: <CAKohpomk0GNJcGKxLX3HuaMBgPiSNzFp5BniyNgRbtoLqPm6bQ@mail.gmail.com>
On 10/13/2014 06:43 AM, Viresh Kumar wrote:
> On 1 August 2014 22:48, Stephen Boyd <sboyd@codeaurora.org> wrote:
>> On 08/01/14 03:27, Prarit Bhargava wrote:
>>>
>>> Can you send me the test and the trace of the deadlock? I'm not creating it with:
>>>
>>
>> This was with conservative as the default, and switching to ondemand
>>
>> # cd /sys/devices/system/cpu/cpu2/cpufreq
>> # ls
>> affected_cpus scaling_available_governors
>> conservative scaling_cur_freq
>> cpuinfo_cur_freq scaling_driver
>> cpuinfo_max_freq scaling_governor
>> cpuinfo_min_freq scaling_max_freq
>> cpuinfo_transition_latency scaling_min_freq
>> related_cpus scaling_setspeed
>> scaling_available_frequencies stats
>> # cat conservative/down_threshold
>> 20
>> # echo ondemand > scaling_governor
>>
>> ======================================================
>> [ INFO: possible circular locking dependency detected ]
>> 3.16.0-rc3-00039-ge1e38f124d87 #47 Not tainted
>> -------------------------------------------------------
>> sh/75 is trying to acquire lock:
>> (s_active#9){++++..}, at: [<c0358a94>] kernfs_remove_by_name_ns+0x3c/0x84
>
> Can you please retry this on mainline? I wasn't able to reproduce it
> now over 3.17.
> I am trying this on Exynos b.L implementation..
I have 100% reproducibility on latest mainline.
Viresh, please see my next post on the locking issues in cpufreq.
P.
>
prev parent reply other threads:[~2014-10-13 11:52 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
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 [this message]
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