* Ingo Molnar ([email protected]) wrote:
>
> * Mathieu Desnoyers <[email protected]> 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.
>
Hi Ingo,
The only problem with do_syscall_trace is that it is only called at the
beginning of the system call. LTT also needs a marker at the end of the system
call to know when the control went back to user space.
Any idea of a nice location (in C code preferably) for such a marker ?
Mathieu
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