linux-kernel - Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

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Message-ID: <20100527223418.281a687f@lxorguk.ukuu.org.uk>
Date:	Thu, 27 May 2010 22:34:18 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Felipe Balbi <felipe.balbi@...ia.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Arve Hjønnevåg <arve@...roid.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>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

On Thu, 27 May 2010 13:29:18 -0400 (EDT)
Alan Stern <stern@...land.harvard.edu> wrote:

> On Thu, 27 May 2010, Peter Zijlstra wrote:
> 
> > On Thu, 2010-05-27 at 13:04 -0400, Alan Stern wrote:
> > > 
> > > Does this mean you believe "echo mem >/sys/power/state" is bad and
> > > should be removed?  Or "echo disk >/sys/power/state"?  They pay no
> > > attention to latencies or other requirements. 
> > 
> > Those are a whole different beast, those are basically a quick-off
> > button like thing. Forced suspend is conceptually a very different beast
> > from power-saving a running system.
> 
> They may be different conceptually.  Nevertheless, Android uses forced 
> suspend as a form of power saving.  Until better mechanisms are in 
> place, it makes sense.

For them, not for Linux.

Several vendors have exciting kernel drivers that do things like binary
patch other modules. Until better mechanisms are in place it does *NOT*
make sense to merge such stuff.

I don't care what they do in their own tree (consenting adults in their
own home and all that) but what they do in the public tree is another
matter.

Alan
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