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Groups > linux.kernel > #1308740
| From | Pavel Machek <pavel@ucw.cz> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH 2/2] PM / Runtime: use deferrable timer for autosuspend |
| Date | 2016-01-13 20:10 +0100 |
| Message-ID | <qQyXU-41l-11@gated-at.bofh.it> (permalink) |
| References | <qQaLV-3Xe-25@gated-at.bofh.it> <qQaLV-3Xe-23@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Tue 2016-01-12 18:17:20, Lucas Stach wrote: > The timeouts used in PM autosuspend are relatively coarse (the shortest > I could find in a quick search through the kernel is 50ms). As they are > already handled relaxed by saving the overhead of always rearming the > timer by opportunistically suspending a device a bit early, it should > not matter if the the timeout is missed slightly. > > By using a deferrable timer the CPU will not be woken just to handle > the autosuspend timeout, but handling will be batched with other > wakeups in the system. > > Signed-off-by: Lucas Stach <l.stach@pengutronix.de> Acked-by: Pavel Machek <pavel@ucw.cz> -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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[PATCH 2/2] PM / Runtime: use deferrable timer for autosuspend Lucas Stach <l.stach@pengutronix.de> - 2016-01-12 18:20 +0100 Re: [PATCH 2/2] PM / Runtime: use deferrable timer for autosuspend Pavel Machek <pavel@ucw.cz> - 2016-01-13 20:10 +0100
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