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

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Message-Id: <201005062126.22909.rjw@sisk.pl>
Date:	Thu, 6 May 2010 21:26:22 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Brian Swetland <swetland@...gle.com>,
	Kevin Hilman <khilman@...prootsystems.com>,
	Matthew Garrett <mjg@...hat.com>,
	Mark Brown <broonie@...nsource.wolfsonmicro.com>,
	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 Thursday 06 May 2010, Alan Stern wrote:
> 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.

Agreed.

Rafael
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