linux-kernel - Re: [PATCH v3 0/4] Add binder state and statistics to binderfs

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Date:   Fri, 27 Sep 2019 11:11:15 -0700
From:   Hridya Valsaraju <hridya@...gle.com>
To:     Christian Brauner <christian.brauner@...ntu.com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Arve Hjønnevåg <arve@...roid.com>,
        Todd Kjos <tkjos@...roid.com>,
        Martijn Coenen <maco@...roid.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        "open list:ANDROID DRIVERS" <devel@...verdev.osuosl.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Android Kernel Team <kernel-team@...roid.com>
Subject: Re: [PATCH v3 0/4] Add binder state and statistics to binderfs

On Fri, Sep 27, 2019 at 6:19 AM Christian Brauner
<christian.brauner@...ntu.com> wrote:
>
> On Tue, Sep 03, 2019 at 09:16:51AM -0700, Hridya Valsaraju wrote:
> > Currently, the only way to access binder state and
> > statistics is through debugfs. We need a way to
> > access the same even when debugfs is not mounted.
> > These patches add a mount option to make this
> > information available in binderfs without affecting
> > its presence in debugfs. The following debugfs nodes
> > will be made available in a binderfs instance when
> > mounted with the mount option 'stats=global' or 'stats=local'.
> >
> >  /sys/kernel/debug/binder/failed_transaction_log
> >  /sys/kernel/debug/binder/proc
> >  /sys/kernel/debug/binder/state
> >  /sys/kernel/debug/binder/stats
> >  /sys/kernel/debug/binder/transaction_log
> >  /sys/kernel/debug/binder/transactions
>
> I'm sitting in a talk from Jonathan about kernel documentation and what
> I realized is that we forgot to update the documentation I wrote for
> binderfs in Documentation/admin-guide/binderfs.rst to reflect the new
> stats=global mount option. Would be great if we could add that after rc1
> is out. Would you have time to do that, Hridya?

Thanks for catching that Christian, sorry about the miss! I will send
out a patch ASAP to add the documentation.

Regards,
Hridya

>
> Should just be a new entry under:
>
> Options
> -------
> max
>   binderfs instances can be mounted with a limit on the number of binder
>   devices that can be allocated. The ``max=<count>`` mount option serves as
>   a per-instance limit. If ``max=<count>`` is set then only ``<count>`` number
>   of binder devices can be allocated in this binderfs instance.
> stats
>   <description>
>
> Thanks!
> Christian