[lttng-dev] LTTng system call tracing on ARM

[Jan Glauber]

On Wed, Apr 10, 2013 at 08:37:18AM -0400, PLSTC wrote:
> Hey Jan,
> 
> I cannot speak on behalf of everyone here, but during our attempt to port
> LTTng to Android, we also noticed that the kernels we were using (3.0.x)
> were nowhere near the requirements for syscall tracepoints support. I
> believe such support was added on x86/64 way earlier (early 3.x) than on
> ARM, which is why it was included in LTTng's modules a while ago. Simply
> put, the ARM kernel is late.

OK, so for ARM kernel version 3.6 is the minimum unless the syscall tracepoint
support is backported.
 
> There are a few actuals ways to 'enable' syscall tracepoints support on
> early ARM kernels, but they all including a bit of kernel hacking/patching.
> I could send you some links if you're interested in that.

Yes, sure!

--Jan

> -PL
> On Apr 10, 2013 4:40 AM, "Jan Glauber" <jan.glauber at gmail.com> wrote:
> 
> > Hi,
> >
> > I want to use LTTng for system call tracing on ARM. Now lttng-modules seems
> > to support system call tracing on ARM already since
> > "8f4f80e LTTng Modules ARM syscall instrumentation".
> >
> > But I wonder how that worked since lttng-syscalls.c is only build under
> > CONFIG_HAVE_SYSCALL_TRACEPOINTS and that was added to ARM only with kernel
> > 3.6
> > (much after than the lttng-modules commit).
> >
> > Am I missing something? Is system call tracing working on ARM with the
> > upstream
> > LTTng version?
> >
> > thanks,
> > Jan
> >
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> >