jimmy bahuleyan wrote: > Al Boldi wrote: > > This should be the responsibility of the kexec'd hibernating kernel. > > Note though in (6), the normal kernel takes care of preparing devices, > > then the hibernating kernel dumps the image and either calls S4 or S3. > > On resume from S3 it can immediately switch over to the normal kernel, > > and from S4 the known bootup would occur. > > > >> (8) Hibernation and restore should not be too slow > >> > >> In my opinion, if more than one minute is needed to hibernate the > >> system with the help of certain hibernation framework, then this > >> framework is not very useful in practice. It might be useful to > >> perform some special tasks (eg. moving a server to another place > >> without taking it down), but it is not very useful, for example, to > >> notebook users. > > > > The latest hibernating kexec patches boot a kexec'd modular kernel with > > initramfs into crashkernel=16M@16M in less than one second. Switch-back > > is almost instant. Add to this the time required to either store or > > restore the image, and it may be obvious that this approach isn't > > slower, but maybe even faster than the current swsusp. > > What about (9)? Would it be that a user choosing to build a kernel with > hibernate support gets a additional modular kernel built (which he > should then use for resumption) or he should configure & build the > modular kernel independent of main kernel? > > Or will the Linux boot procedure change so that it always goes thru a > modular part followed by kexec (just to be uniform)? > > Although the kexec approach seems interesting, the final user-scenario > seems a bit complex (or confusing). Well, it may sound confusing because it is so unexpectedly simple. I didn't answer to (9) because from a user pov nothing should change, and everything should be scriptable such that the user wouldn't even notice the kernel using a new hibernation approach. Thanks! -- Al _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
