linux-kernel - Re: [PATCH 1/8] PM: Opportunistic suspend support.

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Message-ID: <AANLkTil-pPLUZBOpXp0naOyM8IFzQAEN7bUnZz21EFW5@mail.gmail.com>
Date:	Wed, 26 May 2010 22:51:45 +0200
From:	Linus Walleij <linus.ml.walleij@...il.com>
To:	Arve Hjønnevåg <arve@...roid.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Florian Mickler <florian@...kler.org>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Len Brown <len.brown@...el.com>, Pavel Machek <pavel@....cz>,
	Randy Dunlap <rdunlap@...otime.net>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Cornelia Huck <cornelia.huck@...ibm.com>,
	Tejun Heo <tj@...nel.org>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Nigel Cunningham <nigel@...onice.net>,
	Ming Lei <tom.leiming@...il.com>,
	Wu Fengguang <fengguang.wu@...el.com>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	linux-doc@...r.kernel.org, Matthew Garrett <mjg59@...f.ucam.org>,
	Greg KH <gregkh@...e.de>, tytso@....edu,
	James Bottomley <James.Bottomley@...e.de>
Subject: Re: [PATCH 1/8] PM: Opportunistic suspend support.

2010/5/26 Peter Zijlstra <peterz@...radead.org>:
> On Wed, 2010-05-26 at 03:17 -0700, Arve Hjønnevåg wrote:
>> > With a single suspend manager process that manages the suspend state you
>> > can achieve the same goal.
>> >
>>
>> Yes we don't need the /dev interface, but it is useful. Without it any
>> program that needs to block suspend has to make a blocking ipc call
>> into the suspend manager process. Android already does this for java
>> code, but system processes written in C block suspend directly with
>> the kernel since they cannot use the java APIs.
>
> So provide a C interface to it as well?
>
> Surely you can have the java thing have a unix socket or something a C
> app can talk to. That shouldn't be hard at all.
>
> Or make the suspend manager a C proglet and provide a JNI interface, or
> whatever.

Android already has D-Bus:
http://android.git.kernel.org/?p=platform/external/dbus.git;a=summary

Which has Java bindings:
http://dbus.freedesktop.org/doc/dbus-java/

D-Bus can be from C to send messages to the Java daemon.
So why not use that if this seems to be a problem. It even brings
serialized typing and all that funny stuff.

Yours,
Linus Walleij
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