On Tue, May 19, 2015 at 11:52:47AM +0200, Jiri Kosina wrote:
> On Tue, 19 May 2015, Michael Ellerman wrote:
>
> > > ftrace already handles recursion protection by itself (depending on the
> > > per-ftrace-ops FTRACE_OPS_FL_RECURSION_SAFE flag).
> >
> > OK, so I wonder why that's not working for us?
>
> The situation when traced function recurses to itself is different from
> the situation when tracing core infrastrcuture would recurse to itself
> while performing tracing.
I have used this inspiration to add a catch-all parachute for ftrace_caller,
see my last reply. It reappears here as patch 4/4. Expect noticable performance
impact compared to the selected "notrace" attributation discussed here. This
should
still be done in a second step especially for the hardware assistance functions
I mentioned.
Torsten
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