lkml.org 
[lkml]   [2010]   [May]   [3]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 0/8] Suspend block api (version 6)
On Mon, May 03, 2010 at 04:37:22PM -0700, Kevin Hilman wrote:

> Please forgive the ignorance of ACPI (in embedded, we thankfully live
> in magical world without ACPI) but doesn't that already happen with
> CPUidle and C-states? I think of CPUidle as basically runtime PM for
> the CPU. IOW, runtime PM manages the devices, CPUidle manages the CPU
> (via C-states), resulting in dynaimc PM for the entire system. What
> am I missing?

ACPI doesn't provide any functionality for cutting power to most devices
other than shifting into full system suspend. The number of wakeup
events available to us on a given machine is usually small and the
wakeup latency large, so it's not terribly practical to do this
transparently on most hardware.

--
Matthew Garrett | mjg59@srcf.ucam.org


\
 
 \ /
  Last update: 2010-05-04 02:47    [W:0.263 / U:0.936 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site