linux-kernel - Re: [PATCH v4] PM / wakeup: show wakeup sources stats in sysfs

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Message-ID: <CAJZ5v0hxKeK-eDEs1rGP0ZYbbCHa0q5=ZPMVCemYVHGL48Q=pg@mail.gmail.com>
Date:   Tue, 16 Jul 2019 10:30:48 +0200
From:   "Rafael J. Wysocki" <rafael@...nel.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     "Rafael J. Wysocki" <rafael@...nel.org>,
        Tri Vo <trong@...roid.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Viresh Kumar <viresh.kumar@...aro.org>,
        Hridya Valsaraju <hridya@...gle.com>, sspatil@...gle.com,
        kaleshsingh@...gle.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux PM <linux-pm@...r.kernel.org>,
        "Cc: Android Kernel" <kernel-team@...roid.com>
Subject: Re: [PATCH v4] PM / wakeup: show wakeup sources stats in sysfs

On Tue, Jul 16, 2019 at 4:13 AM Greg Kroah-Hartman
<gregkh@...uxfoundation.org> wrote:
>
> On Mon, Jul 15, 2019 at 11:48:27PM +0200, Rafael J. Wysocki wrote:
> > On Mon, Jul 15, 2019 at 11:44 PM Tri Vo <trong@...roid.com> wrote:
> > >
> > > Userspace can use wakeup_sources debugfs node to plot history of suspend
> > > blocking wakeup sources over device's boot cycle. This information can
> > > then be used (1) for power-specific bug reporting and (2) towards
> > > attributing battery consumption to specific processes over a period of
> > > time.
> > >
> > > However, debugfs doesn't have stable ABI. For this reason, create a
> > > 'struct device' to expose wakeup sources statistics in sysfs under
> > > /sys/class/wakeup/<name>/.
> > >
> > > Introduce CONFIG_PM_SLEEP_STATS that enables/disables showing wakeup
> > > source statistics in sysfs.
> >
> > I'm not sure if this is really needed, but I'll let Greg decide.
>
> You are right.  Having zillions of config options is a pain, who is
> going to turn this off?
>
> But we can always remove the option before 5.4-rc1, so I'll take this
> as-is for now :)
>
> > Apart from this
> >
> > Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
>
> thanks for the review!  I'll wait for 5.3-rc1 to come out before adding
> this to my tree.

So it occurred to me that maybe it's better if I apply it?  After all,
this is PM material. :-)

It is fine by me either way, but then I'm not sure if you want to get
future bug reports related to this if any ...