From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1757337Ab0EZKVP (ORCPT <rfc822;w@1wt.eu>);
	Wed, 26 May 2010 06:21:15 -0400
Received: from bombadil.infradead.org ([18.85.46.34]:60379 "EHLO
	bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1757159Ab0EZKVN convert rfc822-to-8bit (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Wed, 26 May 2010 06:21:13 -0400
Subject: Re: [PATCH 1/8] PM: Opportunistic suspend support.
From: Peter Zijlstra <peterz@infradead.org>
To: Arve =?ISO-8859-1?Q?Hj=F8nnev=E5g?= <arve@android.com>
Cc: Florian Mickler <florian@mickler.org>, "Rafael J. Wysocki" <rjw@sisk.pl>,
       Alan Stern <stern@rowland.harvard.edu>,
       Dmitry Torokhov <dmitry.torokhov@gmail.com>,
       Linux-pm mailing list <linux-pm@lists.linux-foundation.org>,
       Kernel development list <linux-kernel@vger.kernel.org>,
       Len Brown <len.brown@intel.com>, Pavel Machek <pavel@ucw.cz>,
       Randy Dunlap <rdunlap@xenotime.net>,
       Andrew Morton <akpm@linux-foundation.org>,
       Andi Kleen <ak@linux.intel.com>,
       Cornelia Huck <cornelia.huck@de.ibm.com>, Tejun Heo <tj@kernel.org>,
       Jesse Barnes <jbarnes@virtuousgeek.org>,
       Nigel Cunningham <nigel@tuxonice.net>, Ming Lei <tom.leiming@gmail.com>,
       Wu Fengguang <fengguang.wu@intel.com>,
       Maxim Levitsky <maximlevitsky@gmail.com>, linux-doc@vger.kernel.org,
       Matthew Garrett <mjg59@srcf.ucam.org>, Greg KH <gregkh@suse.de>,
       tytso@mit.edu, James Bottomley <James.Bottomley@suse.de>
In-Reply-To: <AANLkTimHGpRAZklIwXu6wEbA3coKXJvCVLxj2twerkCw@mail.gmail.com>
References: <Pine.LNX.4.44L0.1005251647530.1634-100000@iolanthe.rowland.org>
	 <201005252344.37639.rjw@sisk.pl>
	 <AANLkTimL5rU5lALezEZVCwdcZL85tVahhsTibdpq9s-Y@mail.gmail.com>
	 <1274863342.5882.4850.camel@twins>
	 <20100526112303.3fef15a4@schatten.dmk.lab>
	 <1274866402.5882.5051.camel@twins>
	 <AANLkTil9ZtMFxTfE6ITiFNOl4S1k3Lvdp5BPgGX7LJhw@mail.gmail.com>
	 <1274868384.5882.5169.camel@twins>
	 <AANLkTimHGpRAZklIwXu6wEbA3coKXJvCVLxj2twerkCw@mail.gmail.com>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 8BIT
Date: Wed, 26 May 2010 12:21:02 +0200
Message-ID: <1274869262.5882.5222.camel@twins>
Mime-Version: 1.0
X-Mailer: Evolution 2.28.3 
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.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.