On Wed 2008-07-09 21:37:18, Rafael J. Wysocki wrote: > On Tuesday, 8 of July 2008, Pavel Machek wrote: > > Hi! > > > > > According to the ACPI spec, ACPI NVS memory region is required to > > > be saved/restored by OS during hibernation. > > > > > > Section 15.3.2 ACPI Spec 3.0b, > > > "OSPM will call the _PTS control method some time before entering > > > a sleeping state, to allow the platform???s AML code to update > > > this memory image before entering the sleeping state. > > > After the system awakes from an S4 state, OSPM will restore this > > > memory area and call the _WAK control method to enable the BIOS > > > to reclaim its memory image." > > > > > > This patch set add the mechanism to save/restore ACPI NVS memory > > > during hibernation. > > > > > > Patch 01: call platform_begin before swsusp_shrink_memory. > > > So that we can allocate enough pages for ACPI NVS memory > > > before shrink the memory. > > > > Why is it neccessary to allocate memory for a copy? We should be able > > to save ACPI NVS area same way we are saving kernel pages, no? > > Because we want to restore it from the hibernated kernel (when it gets control > back again). Why is that important? So we can run some ACPI methods from hibernated kernel before restoring it? -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
