On Sat, Jul 12, 2008 at 3:21 AM, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > On Tue, 8 Jul 2008 10:50:51 -0400 Vivek Goyal <vgoyal@xxxxxxxxxx> wrote: > >> On Mon, Jul 07, 2008 at 11:25:22AM +0800, Huang Ying wrote: >> > This patch provides an enhancement to kexec/kdump. It implements >> > the following features: >> > >> > - Backup/restore memory used by the original kernel before/after >> > kexec. >> > >> > - Save/restore CPU state before/after kexec. >> > >> >> Hi Huang, >> >> In general this patch set looks good enough to live in -mm and >> get some testing going. >> >> To me, adding capability to return back to original kernel looks >> like a logical extension to kexec functionality. > > Exciting ;) It's much less code than I expected. > > I don't think I understand the feature any more. Once upon a time we > thought that this might become a new and better (or at least > better-code-sharing) way of doing suspend-to-disk. How far are we from > that? At least there are still issues as follow: - We need a mechanism to pass some information (such as backup pages map) from hibernated kernel to hibernating kernel. Maybe in C calling convention. - To load hibernation image via /sbin/kexec, the segment number constraint of sys_kexec_load needs to be extended (maybe via multi-stage loading). - Make kexec based hibernation compatible with ACPI S4. - Extend makedumpfile utility for kexec based hibernation. > What are the prospects of supporting other architectures? I will work on x86_64 supporting. > Who maintains kexec-tools, and are they OK with merging up the > corresponding changes? I will work with kexec-tools mailing list for corresponding kexec-tools patches. Best Regards, Huang Ying _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
