linux-kernel - Re: [RFC][PATCH 1/3] PM: Asynchronous resume of devices

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Message-Id: <200908222345.24834.rjw@sisk.pl>
Date:	Sat, 22 Aug 2009 23:45:24 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Pavel Machek <pavel@....cz>
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>,
	Alan Stern <stern@...land.harvard.edu>,
	Arjan van de Ven <arjan@...ux.intel.com>
Subject: Re: [RFC][PATCH 1/3] PM: Asynchronous resume of devices

On Saturday 22 August 2009, Pavel Machek wrote:
> Hi!
> 
> > > Do we really need async for noirq handlers?
> > 
> > Yes, we do.  Specifically, for PCI.
> 
> Do noirq parts of PCI handling really so long that we need to make
> them async?

I think so.  It may get 10 ms to handle a PCI device at this stage usually
and this is all waiting.  If you multiply that by the number of PCI devices ...

> Async in normal paths looks pretty much okay to me, but in noirq
> parts, locking is tricky, etc...

The locking is actually simpler in that case.

Thanks,
Rafael
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