linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Saravana Kannan <skannan@codeaurora.org>
To: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Viresh Kumar <viresh.kumar@linaro.org>,
	Todd Poynor <toddpoynor@google.com>,
	"Srivatsa S . Bhat" <srivatsa@mit.edu>,
	linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-arm-msm@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	Stephen Boyd <sboyd@codeaurora.org>
Subject: Re: [PATCH v4 3/5] cpufreq: Don't destroy/realloc policy/sysfs on hotplug/suspend
Date: Thu, 31 Jul 2014 16:48:00 -0700	[thread overview]
Message-ID: <53DAD5B0.3070500@codeaurora.org> (raw)
In-Reply-To: <3141717.0s1tLjazMZ@vostro.rjw.lan>

On 07/31/2014 02:56 PM, Rafael J. Wysocki wrote:
> On Thursday, July 24, 2014 06:07:26 PM Saravana Kannan wrote:
>> This patch simplifies a lot of the hotplug/suspend code by not
>> adding/removing/moving the policy/sysfs/kobj during hotplug and just leaves
>> the cpufreq directory and policy in place irrespective of whether the CPUs
>> are ONLINE/OFFLINE.
>
> I'm still quite unsure how this is going to work with the real CPU hot-remove
> that makes the entire sysfs cpu directories go away.  Can you please explain
> that?

Sure. Not a problem. I just wanted to make sure you had a chance to look 
at the code first.

Physical hot-remove triggers a "remove" for all the  registered 
subsys_interfaces for that CPU (after going through a couple of 
functions). So, when that happens, the cpufreq subsys_interface remove 
for that CPU gets called. At that point, I clean up that CPU's SW states 
as if it was never plugged in from the start. If that CPU was the owner 
of the sysfs directory, I move it over to a different CPU.

-Saravana

-- 
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
hosted by The Linux Foundation

  parent reply	other threads:[~2014-07-31 23:48 UTC|newest]

Thread overview: 76+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-07-10  2:37 [PATCH] cpufreq: Don't destroy/realloc policy/sysfs on hotplug/suspend Saravana Kannan
2014-07-11  4:18 ` [PATCH v2] " Saravana Kannan
2014-07-11  6:19   ` Viresh Kumar
2014-07-11  9:59     ` skannan
2014-07-11 10:07       ` skannan
2014-07-11 10:52       ` Viresh Kumar
2014-07-12  2:44         ` Saravana Kannan
2014-07-14  6:09           ` Viresh Kumar
2014-07-14 19:08             ` Saravana Kannan
2014-07-15  4:35               ` Viresh Kumar
2014-07-15  5:36                 ` Saravana Kannan
2014-07-15  5:52                   ` Viresh Kumar
2014-07-15  6:58                   ` Srivatsa S. Bhat
2014-07-15 17:35                     ` skannan
2014-07-16  7:44                       ` Srivatsa S. Bhat
2014-07-16  5:44                     ` Viresh Kumar
2014-07-16  7:49                       ` Srivatsa S. Bhat
2014-07-12  3:06     ` Saravana Kannan
2014-07-14  6:13       ` Viresh Kumar
2014-07-14 19:10         ` Saravana Kannan
2014-07-11  7:43   ` Srivatsa S. Bhat
2014-07-11 10:02     ` skannan
2014-07-15 22:47   ` [PATCH v3 0/2] Simplify hotplug/suspend handling Saravana Kannan
2014-07-15 22:47     ` [PATCH v3 1/2] cpufreq: Don't destroy/realloc policy/sysfs on hotplug/suspend Saravana Kannan
2014-07-16  0:28       ` Saravana Kannan
2014-07-16  8:30         ` Viresh Kumar
2014-07-16 19:19           ` Saravana Kannan
2014-07-16  8:24       ` Viresh Kumar
2014-07-16 11:16         ` Srivatsa S. Bhat
2014-07-16 13:13           ` Viresh Kumar
2014-07-16 18:04             ` Srivatsa S. Bhat
2014-07-16 19:56             ` Saravana Kannan
2014-07-17  5:51               ` Viresh Kumar
2014-07-16 19:56           ` Saravana Kannan
2014-07-17  5:35             ` Viresh Kumar
2014-07-18  3:25               ` Saravana Kannan
2014-07-18  4:19                 ` Viresh Kumar
2014-07-16 20:25         ` Saravana Kannan
2014-07-16 21:45           ` Saravana Kannan
2014-07-17  6:24           ` Viresh Kumar
2014-07-16 14:29       ` Dirk Brandewie
2014-07-16 15:28         ` Viresh Kumar
2014-07-16 19:42           ` Saravana Kannan
2014-07-15 22:47     ` [PATCH v3 2/2] cpufreq: Simplify and fix mutual exclusion with hotplug Saravana Kannan
2014-07-16  8:48       ` Viresh Kumar
2014-07-16 19:34         ` Saravana Kannan
2014-07-25  1:07     ` [PATCH v4 0/5] Simplify hotplug/suspend handling Saravana Kannan
2014-07-25  1:07       ` [PATCH v4 1/5] cpufreq: Don't wait for CPU to going offline to restart governor Saravana Kannan
2014-07-31 20:47         ` Saravana Kannan
2014-07-25  1:07       ` [PATCH v4 2/5] cpufreq: Keep track of which CPU owns the kobj/sysfs nodes separately Saravana Kannan
2014-08-07  9:02         ` Viresh Kumar
2014-07-25  1:07       ` [PATCH v4 3/5] cpufreq: Don't destroy/realloc policy/sysfs on hotplug/suspend Saravana Kannan
2014-07-31 21:56         ` Rafael J. Wysocki
2014-07-31 22:15           ` Saravana Kannan
2014-07-31 23:48           ` Saravana Kannan [this message]
2014-08-07 10:51           ` Viresh Kumar
2014-08-12  9:17             ` Viresh Kumar
2014-08-07 10:48         ` Viresh Kumar
2014-08-11 22:13           ` Saravana Kannan
2014-08-12  8:51             ` Viresh Kumar
2014-07-25  1:07       ` [PATCH v4 4/5] cpufreq: Properly handle physical CPU hot-add/hot-remove Saravana Kannan
2014-08-07 11:02         ` Viresh Kumar
2014-08-11 22:15           ` Saravana Kannan
2014-07-25  1:07       ` [PATCH v4 5/5] cpufreq: Delete dead code related to policy save/restore Saravana Kannan
2014-08-07 11:06         ` Viresh Kumar
2014-07-29  5:52       ` [PATCH v4 0/5] Simplify hotplug/suspend handling skannan
2014-07-30  0:29       ` Rafael J. Wysocki
2014-07-31 20:25         ` Saravana Kannan
2014-08-07  6:04         ` skannan
2014-10-16  8:53       ` Viresh Kumar
2014-10-23 21:41         ` Saravana Kannan
2014-07-16 22:02 ` [PATCH] cpufreq: Don't destroy/realloc policy/sysfs on hotplug/suspend Rafael J. Wysocki
2014-07-16 22:35   ` Saravana Kannan
2014-07-24  3:02   ` Saravana Kannan
2014-07-24  5:04     ` Viresh Kumar
2014-07-24  9:12       ` skannan

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=53DAD5B0.3070500@codeaurora.org \
    --to=skannan@codeaurora.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pm@vger.kernel.org \
    --cc=rjw@rjwysocki.net \
    --cc=sboyd@codeaurora.org \
    --cc=srivatsa@mit.edu \
    --cc=toddpoynor@google.com \
    --cc=viresh.kumar@linaro.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).