linux-kernel - Re: [PATCH 0/8] Suspend block api (version 6)

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Message-ID: <Pine.LNX.4.44L0.1005061007050.1708-100000@iolanthe.rowland.org>
Date:	Thu, 6 May 2010 10:08:14 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Brian Swetland <swetland@...gle.com>
cc:	Kevin Hilman <khilman@...prootsystems.com>,
	Matthew Garrett <mjg@...hat.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Arve Hjønnevåg <arve@...roid.com>,
	<linux-pm@...ts.linux-foundation.org>,
	<linux-kernel@...r.kernel.org>, Tejun Heo <tj@...nel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Paul Walmsley <paul@...an.com>, <magnus.damm@...il.com>,
	mark gross <mgross@...ux.intel.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Geoff Smith <geoffx.smith@...el.com>
Subject: Re: [PATCH 0/8] Suspend block api (version 6)

On Wed, 5 May 2010, Brian Swetland wrote:

> > Probably generalizing these into the LDM is the direction to go so
> > userspace can set constraints on a per-device (or per-class?) basis:
> >
> > /sys/devices/.../power/constraint/throughput
> > /sys/devices/.../power/constraint/wakeup_latency
> > /sys/devices/.../power/constraint/... ?
> 
> The constraint stuff is definitely something I'd love to talk about in
> detail.  It's a problem that I think is common to every SoC I've
> worked with.  Having a general solution for this problem (of
> specifying and observing various constraints for clock, power, qos,
> etc) kernel-wide would seem like a big win.
> 
> Might be worth kicking some design ideas around and getting a bunch of
> the interested parties together at some of the upcoming linux
> conference things this fall on the east coast?

The Linux Power-Management Summit is scheduled for August 9, at the 
start of the LinuxCon meeting in Boston.  This would make an excellent 
topic for discussion.

Alan Stern

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