linux-kernel - Re: [PATCH 3/8] PM: suspend_block: Abort task freezing if a suspend

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Message-ID: <20100502065731.GB1790@ucw.cz>
Date:	Sun, 2 May 2010 08:57:31 +0200
From:	Pavel Machek <pavel@....cz>
To:	Arve Hj??nnev??g <arve@...roid.com>
Cc:	linux-pm@...ts.linux-foundation.org, linux-kernel@...r.kernel.org,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Alan Stern <stern@...land.harvard.edu>,
	Tejun Heo <tj@...nel.org>, Oleg Nesterov <oleg@...hat.com>,
	Len Brown <len.brown@...el.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Rientjes <rientjes@...gle.com>,
	Matt Helsley <matthltc@...ibm.com>
Subject: Re: [PATCH 3/8] PM: suspend_block: Abort task freezing if a
 suspend_blocker is active.

Hi!

> If a suspend_blocker is active, suspend will fail anyway. Since
> try_to_freeze_tasks can take up to 20 seconds to complete or fail, aborting
> as soon as someone blocks suspend (e.g. from an interrupt handler) improves
> the worst case wakeup latency.
> 
> On an older kernel where task freezing could fail for processes attached
> to a debugger, this fixed a problem where the device sometimes hung for
> 20 seconds before the screen turned on.
> 
> Signed-off-by: Arve Hj??nnev??g <arve@...roid.com>

I acked this one before, please preserve such tags.
								Pavel

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