Messages in this thread | | | Subject | Re: [lkcd-devel] Re: What's left over. | From | (Eric W. Biederman) | Date | 09 Nov 2002 20:49:15 -0700 |
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Werner Almesberger <wa@almesberger.net> writes:
> Eric W. Biederman wrote: > > What I was thinking is that the process would for and exec > > something like "/etc/rc 6" or maybe "/etc/rc 7" to be clean. > > And that script would do all of the user space shutdown. > > Yes, but init also does a kill(-1,...) to get rid of all processes, > before the last steps of system shutdown. So you have to somehow > make your "page holding" process survive beyond this point.
True. But it is just as easy to drop the file into something like ramfs. Or a file on the read only file on the root filesystem. Now that we can having shutdown do a pivot_root and totally unmounting the root filesystem is probably a good idea.
> > My feel is that kexec-on-panic is a rather different problem. > > You make it a different problem by assuming that you'd have a > kernel that is specifically built for running at a "safe" > location.
Well at least the part cleans up after the running kernel. That is what I think it takes to make it stable. Perhaps I am wrong, but I think getting other architecture stable is very hard.
> If you assume that you're just using your normal > kernel, the two problems converge again. There are still a > few things that are different, like the checksumming, but > they can safely be added at a later time.
I guess I can be proven wrong.
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