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

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Message-ID: <AANLkTimxXcupV0KX1nQIPbuRzZYXZwCebDVahxR-kWkJ@mail.gmail.com>
Date:	Wed, 26 May 2010 13:16:18 +0200
From:	Vitaly Wool <vitalywool@...il.com>
To:	Arve Hjønnevåg <arve@...roid.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	linux-doc@...r.kernel.org, Jesse Barnes <jbarnes@...tuousgeek.org>,
	Andi Kleen <ak@...ux.intel.com>,
	Florian Mickler <florian@...kler.org>,
	Linux-pm mailing list <linux-pm@...ts.linux-foundation.org>,
	Len Brown <len.brown@...el.com>, tytso@....edu,
	Greg KH <gregkh@...e.de>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Tejun Heo <tj@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [linux-pm] [PATCH 1/8] PM: Opportunistic suspend support.

2010/5/26 Arve Hjønnevåg <arve@...roid.com>:
> 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?
>>
>
> We could, but the result would be that any program that needs to block
> suspend has to be android specific.

Just a suspicion, but... The things you're saying don't make sense to
me other than if you're fighting with GPL in userspace here.

~Vitaly
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