linux-kernel - Re: [RFC][PATCH 0/3] PM: Asynchronous suspend and resume

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Message-Id: <200908132310.26539.rjw@sisk.pl>
Date:	Thu, 13 Aug 2009 23:10:26 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	"linux-pm" <linux-pm@...ts.linux-foundation.org>,
	"linux-acpi" <linux-acpi@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Zhang Rui <rui.zhang@...el.com>, Len Brown <lenb@...nel.org>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [RFC][PATCH 0/3] PM: Asynchronous suspend and resume

On Thursday 13 August 2009, Alan Stern wrote:
> On Thu, 13 Aug 2009, Rafael J. Wysocki wrote:
> 
> > > If the set of pm_connection objects is reasonably small then the
> > > master_hook and slave_hook aren't needed; you can just read through the
> > > entire list.  Leaving out parent-child connections, which we already
> > > know, would help shrink the set.
> > 
> > Do you mean a global list for the entire system?  I'm not sure if that wouldn't
> > hurt performance (please note that it also affects runtime PM).
> 
> It doesn't have to affect runtime PM.  That is, for runtime PM we can 
> make the bus subsystems responsible for enforcing the dependencies.

Since the runtime PM framework takes the parent-child relationships into
accout, I think it should also follow the "master"-"slave" dependencies if they
are represented at the core level.

Still, at this point the question really is how many off-tree dependencies
there are, because the best way to represent them will follow from that.

Thanks,
Rafael
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