linux-kernel - Re: suspend blockers & Android integration

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Message-ID: <AANLkTilpubFRXeNgrzShBnL_EvHu9cKW8lAETIiTgMtr@mail.gmail.com>
Date:	Mon, 7 Jun 2010 17:45:01 -0700
From:	Arve Hjønnevåg <arve@...roid.com>
To:	Matt Helsley <matthltc@...ibm.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...e.hu>, tytso@....edu,
	Brian Swetland <swetland@...gle.com>,
	Neil Brown <neilb@...e.de>,
	Alan Stern <stern@...land.harvard.edu>,
	Felipe Balbi <felipe.balbi@...ia.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Florian Mickler <florian@...kler.org>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	Linux PM <linux-pm@...ts.linux-foundation.org>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	James Bottomley <James.Bottomley@...e.de>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Kevin Hilman <khilman@...prootsystems.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	Arjan van de Ven <arjan@...radead.org>
Subject: Re: suspend blockers & Android integration

On Sun, Jun 6, 2010 at 7:43 AM, Matt Helsley <matthltc@...ibm.com> wrote:
> On Sun, Jun 06, 2010 at 12:36:21PM +0200, Thomas Gleixner wrote:
>> On Sat, 5 Jun 2010, Arve Hjønnevåg wrote:
>
> <snip>
>
>> > events like input event go though a single thread in our system
>> > process, while other events like network packets (which are also
>> > wakeup events) goes directly to the app.
>
> If you want to wake up cgroup-frozen tasks for these fds perhaps your
> framework can fcnt(fd, F_SETOWN, <p[g]id>) to send SIGIO to a

How does the framework get all the fds that are used by the apps for
wakeup events?

> userspace-suspend-blocker thread/process/process group. When IO comes in, the
> suspend blocker is signalled which then unfreezes the cgroup of the frozen
> untrusted task. SIGIO works on pipes, fifos, sockets, ttys, and ptys --
> many of which are precisely the kinds of things that would connect [trusted
> and untrusted] apps. Notably absent (last I checked): inotify fds, signalfd,
> timerfd, eventfd, filesystem fds and likely more.
>
> Incidentally, this is just to show that it's not impossible to implement
> "wakeups" for cgroup-frozen tasks in userspace.
>
> Cheers,
>        -Matt Helsley
>



-- 
Arve Hjønnevåg
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