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

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Date:	Wed, 26 May 2010 19:00:28 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	James Bottomley <James.Bottomley@...e.de>
Cc:	Pekka Enberg <penberg@...helsinki.fi>,
	Arve Hjønnevåg <arve@...roid.com>,
	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
Subject: Re: [PATCH 1/8] PM: Opportunistic suspend support.

On Wed, 2010-05-26 at 11:54 -0500, James Bottomley wrote:
> Given that I'm in the latter category, I think suspend blockers is a
> reasonable solution to an existing problem.  I like Alan's idea of
> restricting the API into a single user space program so we contain the
> API contamination ... but realistically that's mostly the current
> suspend blockers anyway. 

There's a _large_ difference between resource limits and these wonky
suspend blockers.

The main and most important one being that suspend is a global property
and can/will hurt sensible tasks. It puts the whole task model upside
down.

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