[lkml]   [2007]   [Jul]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [linux-pm] Re: Hibernation considerations
On Fri, 20 Jul 2007, Milton Miller wrote:

> > We can't do this unless we have frozen tasks (this way, or another)
> > before
> > carrying out the entire operation.
> What can't we do? We've already worked with the drivers to quesce the
> hardware and put any information to resume the device in ram. Now we
> ask them to put their device in low power mode so we can go to sleep.
> Even if we schedule, the only thing userspace could touch is memory.

Userspace can submit I/O requests. Someone will have to audit every
driver to make sure that such I/O requests don't cause a quiesced
device to become active. If the device is active, it will make the
memory snapshot inconsistent with the on-device data.

Alan Stern

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2007-07-20 18:53    [W:0.330 / U:0.060 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site