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

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Date:	Fri, 28 May 2010 20:16:20 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Zygo Blaxell <vger-linux-omap-esightcorp@...ltoo.hungrycats.org>
Cc:	Brian Swetland <swetland@...gle.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Matthew Garrett <mjg59@...f.ucam.org>,
	Igor Stoppa <igor.stoppa@...ia.com>, tytso@....edu,
	LKML <linux-kernel@...r.kernel.org>,
	Florian Mickler <florian@...kler.org>,
	Linux PM <linux-pm@...ts.linux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Linux OMAP Mailing List <linux-omap@...r.kernel.org>,
	"Balbi Felipe (Nokia-D/Helsinki)" <felipe.balbi@...ia.com>
Subject: Re: [linux-pm] [PATCH 0/8] Suspend block api (version 8)

On Fri, 2010-05-28 at 13:27 -0400, Zygo Blaxell wrote:
> From my reading of this thread, there's a lot of overlap between
> suspendblockers and constraints.  Many use cases are served equally
> well with one or the other, 

If using suspend-blockers, 

Please explain to me how:

- I will avoid the cpu going into some idle state for which the wakeup
latency is larger than my RT app fancies?

- to avoid some tasks from being serviced by the filesystems whilst
others are? (ionice on steroids).

- does my sporadic task (with strict bandwidth budget) not suffer
bandwidth inversion?


suspend blockers do a bit of each of that, but none of it in a usable
fashion.

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