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