Re: Is notify_die being overloaded?

On Sat, Apr 15, 2006 at 04:19:55PM +1000, Keith Owens wrote:
Robin Holt (on Thu, 13 Apr 2006 14:46:44 -0500) wrote:
notify_die seems to be called to indicate the machine is going down as
well as there are trapped events for the process.
...
The only real problem is the page fault handler event. All the other
...

kprobes should be using its own notify chain to trap page faults, and
the handler for that chain should be optimized away when
CONFIG_KPROBES=n or there are no active probes.

I realize the page fault handler is the only performance critical event,
but don't all the debugging events _REALLY_ deserve a seperate call chain?
They are _completely_ seperate and isolated events. One is a minor event
which a small number of other userland processes are concerned with.
The other is indicating the machine is about stop running and is only
relevant to critical system infrastructure.

When I get back from vacation on Tuesday, I will try to work up a patch
which introduces a notify_debug() call and its call chain. Maybe that
will initiate more discussion.

Thanks,
Robin
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