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Jeremy Maitin-Shepard wrote: > Al Boldi <a1426z@gawab.com> writes: > > >>Pavel Machek wrote: >> >>>We are stuck with refrigerator for now, and at least for hibernation, >>>I don't see any feasible alternative. > > >>Feasible alternative? > > > I posted such an alternative to the list a short time ago: hibenrating > from a *new* kernel space/user space that is created by loading a new > kernel in a manner similar to what is done for kexec crashdumps. Unlike > kexec crashdumps, however, it would not require reserving any memory at > boot, because the necessary memory (maybe 16MB or 64MB) can be freed > just before hibernating, and device drivers can be properly stopped so > that DMAs don't stomp over certain memory. This is the Morton method, isn't it? :) I remember it sounding like a very good idea when he brought it up, but I can't remember the details of why it was rejected or what the problems were. > This approach eliminates the need for the freezer, as it would make > hibernate look a lot a bit like suspend to ram from the perspective of > the "old" kernel (the kernel being hibernated), as the hibernate > operation itself would be completely atomic from the perspective of the > "old" kernel. That is not to say, of course, that any code paths would > actually be shared, or that the drivers would do the same things > (because they probably would not). Well it basically is suspend to RAM with the additional step that a new kernel gets booted and writes out the data from RAM to disk then shuts down. I suspect that freeing memory on the fly for the new kernel would be non-trivial (but possible), however simply having a reserve RAM region for the new kernel would be fine for a first step. -- SUSE Labs, Novell Inc. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||
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