From: "Srivatsa S. Bhat" <srivatsa@MIT.EDU> To: Viresh Kumar <viresh.kumar@linaro.org> Cc: Saravana Kannan <skannan@codeaurora.org>, "Rafael J . Wysocki" <rjw@rjwysocki.net>, Todd Poynor <toddpoynor@google.com>, "linux-pm@vger.kernel.org" <linux-pm@vger.kernel.org>, Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, "linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>, "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org>, Stephen Boyd <sboyd@codeaurora.org> Subject: Re: [PATCH v2] cpufreq: Don't destroy/realloc policy/sysfs on hotplug/suspend Date: Wed, 16 Jul 2014 13:19:39 +0530 [thread overview] Message-ID: <53C62E93.8010307@mit.edu> (raw) In-Reply-To: <CAKohpon8zDP3hVFMQV4CO2zOkb-AwnDws8xW=H8Hm4=gW=8FGQ@mail.gmail.com> On 07/16/2014 11:14 AM, Viresh Kumar wrote: > On 15 July 2014 12:28, Srivatsa S. Bhat <srivatsa@mit.edu> wrote: >> Wait, allowing an offline CPU to be the policy->cpu (i.e., the CPU which is >> considered as the master of the policy/group) is just absurd. > > Yeah, that was as Absurd as I am :) > I have had my own share of silly ideas over the years; so don't worry, we are all in the same boat ;-) >> The goal of this patchset should be to just de-couple the sysfs files/ownership >> from the policy->cpu to an extent where it doesn't matter who owns those >> files, and probably make it easier to do CPU hotplug without having to >> destroy and recreate the files on every hotplug operation. > > I went to that Absurd idea because we thought we can skip playing with > the sysfs nodes on suspend/hotplug. > > And if policy->cpu keeps changing with hotplug, we *may* have to keep > sysfs stuff moving as well. One way to avoid that is by using something > like: policy->sysfs_cpu, but wasn't sure if that's the right path to follow. > Hmm, I understand.. Even I don't have any suggestions as of now, since I haven't spent enough time thinking of alternatives yet. > Lets see what Saravana's new patchset has for us :) > Yep :-) Regards, Srivatsa S. Bhat
WARNING: multiple messages have this Message-ID (diff)
From: srivatsa@MIT.EDU (Srivatsa S. Bhat) To: linux-arm-kernel@lists.infradead.org Subject: [PATCH v2] cpufreq: Don't destroy/realloc policy/sysfs on hotplug/suspend Date: Wed, 16 Jul 2014 13:19:39 +0530 [thread overview] Message-ID: <53C62E93.8010307@mit.edu> (raw) In-Reply-To: <CAKohpon8zDP3hVFMQV4CO2zOkb-AwnDws8xW=H8Hm4=gW=8FGQ@mail.gmail.com> On 07/16/2014 11:14 AM, Viresh Kumar wrote: > On 15 July 2014 12:28, Srivatsa S. Bhat <srivatsa@mit.edu> wrote: >> Wait, allowing an offline CPU to be the policy->cpu (i.e., the CPU which is >> considered as the master of the policy/group) is just absurd. > > Yeah, that was as Absurd as I am :) > I have had my own share of silly ideas over the years; so don't worry, we are all in the same boat ;-) >> The goal of this patchset should be to just de-couple the sysfs files/ownership >> from the policy->cpu to an extent where it doesn't matter who owns those >> files, and probably make it easier to do CPU hotplug without having to >> destroy and recreate the files on every hotplug operation. > > I went to that Absurd idea because we thought we can skip playing with > the sysfs nodes on suspend/hotplug. > > And if policy->cpu keeps changing with hotplug, we *may* have to keep > sysfs stuff moving as well. One way to avoid that is by using something > like: policy->sysfs_cpu, but wasn't sure if that's the right path to follow. > Hmm, I understand.. Even I don't have any suggestions as of now, since I haven't spent enough time thinking of alternatives yet. > Lets see what Saravana's new patchset has for us :) > Yep :-) Regards, Srivatsa S. Bhat
next prev parent reply other threads:[~2014-07-16 7:49 UTC|newest] Thread overview: 205+ 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 2014-07-10 2:37 ` Saravana Kannan 2014-07-11 4:18 ` [PATCH v2] " Saravana Kannan 2014-07-11 4:18 ` Saravana Kannan 2014-07-11 6:19 ` Viresh Kumar 2014-07-11 6:19 ` Viresh Kumar 2014-07-11 6:19 ` Viresh Kumar 2014-07-11 9:59 ` skannan 2014-07-11 9:59 ` skannan at codeaurora.org 2014-07-11 9:59 ` skannan 2014-07-11 10:07 ` skannan 2014-07-11 10:07 ` skannan at codeaurora.org 2014-07-11 10:07 ` skannan 2014-07-11 10:52 ` Viresh Kumar 2014-07-11 10:52 ` Viresh Kumar 2014-07-11 10:52 ` Viresh Kumar 2014-07-12 2:44 ` Saravana Kannan 2014-07-12 2:44 ` Saravana Kannan 2014-07-12 2:44 ` Saravana Kannan 2014-07-14 6:09 ` Viresh Kumar 2014-07-14 6:09 ` Viresh Kumar 2014-07-14 6:09 ` Viresh Kumar 2014-07-14 19:08 ` Saravana Kannan 2014-07-14 19:08 ` Saravana Kannan 2014-07-14 19:08 ` Saravana Kannan 2014-07-15 4:35 ` Viresh Kumar 2014-07-15 4:35 ` Viresh Kumar 2014-07-15 4:35 ` Viresh Kumar 2014-07-15 5:36 ` Saravana Kannan 2014-07-15 5:36 ` Saravana Kannan 2014-07-15 5:36 ` Saravana Kannan 2014-07-15 5:52 ` Viresh Kumar 2014-07-15 5:52 ` Viresh Kumar 2014-07-15 5:52 ` Viresh Kumar 2014-07-15 6:58 ` Srivatsa S. Bhat 2014-07-15 6:58 ` Srivatsa S. Bhat 2014-07-15 6:58 ` Srivatsa S. Bhat 2014-07-15 17:35 ` skannan 2014-07-15 17:35 ` skannan at codeaurora.org 2014-07-15 17:35 ` skannan 2014-07-16 7:44 ` Srivatsa S. Bhat 2014-07-16 7:44 ` Srivatsa S. Bhat 2014-07-16 7:44 ` Srivatsa S. Bhat 2014-07-16 5:44 ` Viresh Kumar 2014-07-16 5:44 ` Viresh Kumar 2014-07-16 5:44 ` Viresh Kumar 2014-07-16 7:49 ` Srivatsa S. Bhat [this message] 2014-07-16 7:49 ` Srivatsa S. Bhat 2014-07-16 7:49 ` Srivatsa S. Bhat 2014-07-12 3:06 ` Saravana Kannan 2014-07-12 3:06 ` Saravana Kannan 2014-07-12 3:06 ` Saravana Kannan 2014-07-14 6:13 ` Viresh Kumar 2014-07-14 6:13 ` Viresh Kumar 2014-07-14 6:13 ` Viresh Kumar 2014-07-14 19:10 ` Saravana Kannan 2014-07-14 19:10 ` Saravana Kannan 2014-07-14 19:10 ` Saravana Kannan 2014-07-11 7:43 ` Srivatsa S. Bhat 2014-07-11 7:43 ` Srivatsa S. Bhat 2014-07-11 10:02 ` skannan 2014-07-11 10:02 ` skannan at codeaurora.org 2014-07-15 22:47 ` [PATCH v3 0/2] Simplify hotplug/suspend handling Saravana Kannan 2014-07-15 22:47 ` Saravana Kannan 2014-07-15 22:47 ` [PATCH v3 1/2] cpufreq: Don't destroy/realloc policy/sysfs on hotplug/suspend Saravana Kannan 2014-07-15 22:47 ` Saravana Kannan 2014-07-16 0:28 ` Saravana Kannan 2014-07-16 0:28 ` Saravana Kannan 2014-07-16 8:30 ` Viresh Kumar 2014-07-16 8:30 ` Viresh Kumar 2014-07-16 8:30 ` Viresh Kumar 2014-07-16 19:19 ` Saravana Kannan 2014-07-16 19:19 ` Saravana Kannan 2014-07-16 19:19 ` Saravana Kannan 2014-07-16 8:24 ` Viresh Kumar 2014-07-16 8:24 ` Viresh Kumar 2014-07-16 8:24 ` Viresh Kumar 2014-07-16 11:16 ` Srivatsa S. Bhat 2014-07-16 11:16 ` Srivatsa S. Bhat 2014-07-16 11:16 ` Srivatsa S. Bhat 2014-07-16 13:13 ` Viresh Kumar 2014-07-16 13:13 ` Viresh Kumar 2014-07-16 13:13 ` Viresh Kumar 2014-07-16 18:04 ` Srivatsa S. Bhat 2014-07-16 18:04 ` Srivatsa S. Bhat 2014-07-16 18:04 ` Srivatsa S. Bhat 2014-07-16 19:56 ` Saravana Kannan 2014-07-16 19:56 ` Saravana Kannan 2014-07-16 19:56 ` Saravana Kannan 2014-07-17 5:51 ` Viresh Kumar 2014-07-17 5:51 ` Viresh Kumar 2014-07-17 5:51 ` Viresh Kumar 2014-07-16 19:56 ` Saravana Kannan 2014-07-16 19:56 ` Saravana Kannan 2014-07-16 19:56 ` Saravana Kannan 2014-07-17 5:35 ` Viresh Kumar 2014-07-17 5:35 ` Viresh Kumar 2014-07-17 5:35 ` Viresh Kumar 2014-07-18 3:25 ` Saravana Kannan 2014-07-18 3:25 ` Saravana Kannan 2014-07-18 3:25 ` Saravana Kannan 2014-07-18 4:19 ` Viresh Kumar 2014-07-18 4:19 ` Viresh Kumar 2014-07-18 4:19 ` Viresh Kumar 2014-07-16 20:25 ` Saravana Kannan 2014-07-16 20:25 ` Saravana Kannan 2014-07-16 20:25 ` Saravana Kannan 2014-07-16 21:45 ` Saravana Kannan 2014-07-16 21:45 ` Saravana Kannan 2014-07-16 21:45 ` Saravana Kannan 2014-07-17 6:24 ` Viresh Kumar 2014-07-17 6:24 ` Viresh Kumar 2014-07-17 6:24 ` Viresh Kumar 2014-07-16 14:29 ` Dirk Brandewie 2014-07-16 14:29 ` Dirk Brandewie 2014-07-16 15:28 ` Viresh Kumar 2014-07-16 15:28 ` Viresh Kumar 2014-07-16 15:28 ` Viresh Kumar 2014-07-16 19:42 ` Saravana Kannan 2014-07-16 19:42 ` Saravana Kannan 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 2014-07-15 22:47 ` Saravana Kannan 2014-07-16 8:48 ` Viresh Kumar 2014-07-16 8:48 ` Viresh Kumar 2014-07-16 8:48 ` Viresh Kumar 2014-07-16 19:34 ` Saravana Kannan 2014-07-16 19:34 ` Saravana Kannan 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 ` 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 2014-07-25 1:07 ` Saravana Kannan 2014-07-31 20:47 ` 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 2014-07-25 1:07 ` Saravana Kannan 2014-08-07 9:02 ` Viresh Kumar 2014-08-07 9:02 ` Viresh Kumar 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 2014-07-25 1:07 ` Saravana Kannan 2014-07-31 21:56 ` Rafael J. Wysocki 2014-07-31 21:56 ` Rafael J. Wysocki 2014-07-31 22:15 ` Saravana Kannan 2014-07-31 22:15 ` Saravana Kannan 2014-07-31 23:48 ` Saravana Kannan 2014-07-31 23:48 ` Saravana Kannan 2014-07-31 23:48 ` Saravana Kannan 2014-08-07 10:51 ` Viresh Kumar 2014-08-07 10:51 ` Viresh Kumar 2014-08-07 10:51 ` Viresh Kumar 2014-08-12 9:17 ` Viresh Kumar 2014-08-12 9:17 ` Viresh Kumar 2014-08-12 9:17 ` Viresh Kumar 2014-08-07 10:48 ` Viresh Kumar 2014-08-07 10:48 ` Viresh Kumar 2014-08-07 10:48 ` Viresh Kumar 2014-08-11 22:13 ` Saravana Kannan 2014-08-11 22:13 ` Saravana Kannan 2014-08-11 22:13 ` Saravana Kannan 2014-08-12 8:51 ` Viresh Kumar 2014-08-12 8:51 ` Viresh Kumar 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 2014-07-25 1:07 ` Saravana Kannan 2014-07-25 1:07 ` Saravana Kannan 2014-08-07 11:02 ` Viresh Kumar 2014-08-07 11:02 ` Viresh Kumar 2014-08-07 11:02 ` Viresh Kumar 2014-08-11 22:15 ` Saravana Kannan 2014-08-11 22:15 ` Saravana Kannan 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 2014-07-25 1:07 ` Saravana Kannan 2014-08-07 11:06 ` Viresh Kumar 2014-08-07 11:06 ` Viresh Kumar 2014-08-07 11:06 ` Viresh Kumar 2014-07-29 5:52 ` [PATCH v4 0/5] Simplify hotplug/suspend handling skannan 2014-07-29 5:52 ` skannan at codeaurora.org 2014-07-29 5:52 ` skannan 2014-07-30 0:29 ` Rafael J. Wysocki 2014-07-30 0:29 ` Rafael J. Wysocki 2014-07-31 20:25 ` Saravana Kannan 2014-07-31 20:25 ` Saravana Kannan 2014-08-07 6:04 ` skannan 2014-08-07 6:04 ` skannan at codeaurora.org 2014-10-16 8:53 ` Viresh Kumar 2014-10-16 8:53 ` Viresh Kumar 2014-10-16 8:53 ` Viresh Kumar 2014-10-23 21:41 ` Saravana Kannan 2014-10-23 21:41 ` Saravana Kannan 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 22:02 ` Rafael J. Wysocki 2014-07-16 22:35 ` Saravana Kannan 2014-07-16 22:35 ` Saravana Kannan 2014-07-24 3:02 ` Saravana Kannan 2014-07-24 3:02 ` Saravana Kannan 2014-07-24 5:04 ` Viresh Kumar 2014-07-24 5:04 ` Viresh Kumar 2014-07-24 5:04 ` Viresh Kumar 2014-07-24 9:12 ` skannan 2014-07-24 9:12 ` skannan at codeaurora.org 2014-07-24 9:12 ` skannan
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