Garrett D'Amore wrote: > Nicolas Williams wrote: >> Will it be possible to configure a system to do a fast reboot after a >> panic? (Also, it might be possible to save less than a full crash dump >> and let the system handle the rest of the crash dump after the fast >> reboot.) >> >> Nico >> > The last I checked, the copy of the crash dump is already done in > parallel to normal multi-user boot.
Indeed; 'savecore'. > I think the dump of physical ram to core has to be done before the > reboot (fast or otherwise) in order to prevent loss of data. (The > contents of RAM are not guaranteed to be the same after the reboot > cycle, even for a fast reboot.) Actually, yes they are; that's the whole trick of fast reboot, is that you write the kernel into memory and then jump to it without going thru anything that would potentially clear the memory. That's exactly the whole leverage of the fast reboot mechanism. Saving pieces of the old kernel for later dumping would be trickier, but certainly possible; however I'm pretty sure it's not part of the current implementation.
