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 _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
