Re: LTTng and SystemTAP (Everyone who is scared to read this huge thread, skip to here)

[Ingo Molnar <mingo@elte.hu>]

* Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> wrote:

> > Some of the extensive hooking you do in LTT could be aleviated to a 
> > great degree if you used dynamic probes. For example the syscall 
> > entry hackery in LTT looks truly scary.
> 
> Yes, agreed. The last time I checked, I thought about moving this 
> tracing code to the syscall_trace_entry/exit (used for security hooks 
> and ptrace if I remember well). I just didn't have the time to do it 
> yet.

correct, that's where all such things (auditing, seccomp, ptrace, 
sigstop, freezing, etc.) hook into. Much (all?) of the current entry.S 
hacks can go away in favor of a much easier .c patch to 
do_syscall_trace() and this would reduce a significantion portion of the 
present intrusiveness of LTTng.

	Ingo
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