Messages in this thread | | | Subject | Re: [Fastboot] [RFC][PATCH] Add missing notifier before crashing | From | (Eric W. Biederman) | Date | Fri, 02 Jun 2006 09:20:52 -0600 |
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Preben Traerup <Preben.Trarup@ericsson.com> writes:
> Something like out of memory and oops-es are enough to deeme the system must > panic > because it is simply not supposed to happen in a Telco server at any time.
That is clearly enough to deem that the system must take some sever action and stop running. You don't necessarily have to handle it through a kernel panic.
> kdump helps debugging these cases, but more importantly another server > must take over the work, and this has and always will have highest priority. > > I'm happy about what crash_kexec does today, but the timing issue makes it > unusable for > notifications to external systems, if I need to wait until properly running in > next kernel.
Nothing says you have to wait until properly running in the next kernel. You can also write a dedicated piece of code that just pushes one packet out the NIC. Then you can start up a kernel for analysis purposes.
Although I have a hard time believing you can't tune a kernel to start up quickly enough if you leave out just about everything.
And for purposes analysis assume that the oops happened somewhere in the network stack.
> That leaves me the choice of doing notification before executing crash_kexec ?
Only because you have assumed that you have to start another kernel and starting that other kernel must be an expensive operation.
> Since I'm apperantly not the only one left with this choice I rather prefer a > solution > made in public, that is known to be "bad" in some (well known) situations than > each and everybody implements their own solution to the same problem.
It is certainly worth discussing.
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