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From: Yu Chen <yu.c.chen@intel.com>
To: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Linux PM <linux-pm@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Viresh Kumar <viresh.kumar@linaro.org>,
	Gabriele Mazzotta <gabriele.mzt@gmail.com>
Subject: Re: [RFT][PATCH 0/2] cpufreq: intel_pstate: Handle _PPC updates on global turbo disable/enable
Date: Sat, 2 Mar 2019 18:30:08 +0800	[thread overview]
Message-ID: <20190302103008.GA7086@chenyu-office.sh.intel.com> (raw)
In-Reply-To: <fa5e3e09eb32f5197bef2a50ced952850bf70748.camel@linux.intel.com>

On Fri, Mar 01, 2019 at 09:39:27AM -0800, Srinivas Pandruvada wrote:
> On Fri, 2019-03-01 at 13:43 +0100, Rafael J. Wysocki wrote:
> > Hi All,
> > 
> > This is how I would fix the issue reported in BZ 200759 (see this
> > patch series
> > from Yu too: https://marc.info/?l=linux-pm&m=155137672924029&w=2).
> > 
> > Patch [1/2] causes intel_pstate to update all policies if it gets a
> > _PPC change
> > notification and sees a global turbo disable/enable change.
> > 
> > Patch [2/2] makes it update cpuinfo.max_freq for all policies in
> > those cases.
> > 
> > The patches here have not been tested yet, so testing would be much
> > appreciated.
> > 
> > Of course, comments are welcome too!
> 
> This is the only platform, someone reported such issue.
> Can we solve this by some udev rules and offline/online cpu 1-3 on
> power source change?
>
Sound reasonable, we can deal with this BIOS problem in user space
too. But if cpu0 could not be offline, how could cpu0's policy
be updated?

Thanks,
Yu

> There are examples of changing governors on power source change.
> https://bbs.archlinux.org/viewtopic.php?id=207186
> 
> Here instead of changing governor just
> echo 0 > /sys/devices/system/cpu/cpu1/online
> echo 1 > /sys/devices/system/cpu/cpu1/online
> echo 0 >
> /sys/devices/system/cpu/cpu2/online
> echo 1 >
> /sys/devices/system/cpu/cpu2/online
> echo 0 >
> /sys/devices/system/cpu/cpu3/online
> echo 1 >
> /sys/devices/system/cpu/cpu3/online
> 
> Thanks,
> Srinivas
> 
> > 
> > Thanks,
> > Rafael
> > 
> 

  reply	other threads:[~2019-03-02 10:21 UTC|newest]

Thread overview: 35+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-03-01 12:43 [RFT][PATCH 0/2] cpufreq: intel_pstate: Handle _PPC updates on global turbo disable/enable Rafael J. Wysocki
2019-03-01 12:45 ` [RFT][PATCH 1/2] cpufreq: intel_pstate: Driver-specific handling of _PPC updates Rafael J. Wysocki
2019-03-01 12:47 ` [RFT][PATCH 2/2] cpufreq: intel_pstate: Update max CPU frequency on global turbo changes Rafael J. Wysocki
2019-03-01 12:57   ` [RFT][Update][PATCH " Rafael J. Wysocki
2019-03-04 14:39     ` Yu Chen
2019-03-05 10:42     ` Quentin Perret
2019-03-05 10:50       ` Rafael J. Wysocki
2019-03-05 10:58         ` Rafael J. Wysocki
2019-03-05 11:44           ` Peter Zijlstra
2019-03-05 11:52             ` Rafael J. Wysocki
2019-03-05 12:00             ` Quentin Perret
2019-03-05 12:24               ` Peter Zijlstra
2019-03-05 17:02               ` Rafael J. Wysocki
2019-03-05 17:37                 ` Quentin Perret
2019-03-06 10:05                   ` Rafael J. Wysocki
2019-03-07 11:02                     ` Quentin Perret
2019-03-07 11:23                       ` Peter Zijlstra
2019-03-07 11:49                         ` Quentin Perret
2019-03-07 11:25                       ` Rafael J. Wysocki
2019-03-07 11:59                         ` Quentin Perret
2019-03-05 11:01         ` Quentin Perret
2019-03-01 17:39 ` [RFT][PATCH 0/2] cpufreq: intel_pstate: Handle _PPC updates on global turbo disable/enable Srinivas Pandruvada
2019-03-02 10:30   ` Yu Chen [this message]
2019-03-02 16:24     ` Srinivas Pandruvada
2019-03-03 17:03   ` Rafael J. Wysocki
2019-03-03 21:20     ` Srinivas Pandruvada
2019-03-03 21:51       ` Rafael J. Wysocki
2019-03-04  4:06         ` Srinivas Pandruvada
2019-03-04  9:41           ` Rafael J. Wysocki
2019-03-04 18:06             ` Srinivas Pandruvada
2019-03-04 21:57               ` Rafael J. Wysocki
2019-03-04 23:04                 ` Srinivas Pandruvada
2019-03-05  8:40                   ` Rafael J. Wysocki
2019-03-03 22:42 ` Gabriele Mazzotta
2019-03-04  9:58   ` Rafael J. Wysocki

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