Re: trace_printk() support in trace-cmd

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Em Sun, Dec 12, 2010 at 07:42:06PM +0200, Avi Kivity escreveu:
> On 12/12/2010 07:36 PM, Arnaldo Carvalho de Melo wrote:
> >Em Sun, Dec 12, 2010 at 06:35:24PM +0200, Avi Kivity escreveu:
> >>  On 11/23/2010 05:45 PM, Steven Rostedt wrote:
> >>  >Again, the work around is to replace your trace_printks() with
> >>  >__trace_printk(_THIS_IP_, ...) or just modify the trace_printk() macro
> >>  >in include/linux/kernel.h to always use the __trace_printk() version.
> >>
> >>  This works; I'm using it for now (I tried to use 'perf probe', but I
> >>  get unpredictable results, like null pointer derefs).
> >
> >Can you tell us which functions, environment, etc?
> 
> Something around 2.6.27-rc4; example functions are FNAME(fetch) in
> arch/x86/kvm/paging_tmpl.h; compiled modular (which was Steven's
> guess as to why it fails).
> 
> (note, the failure is with trace-cmd, not /sys/kernel/debug/tracing).

I mean the "I tried to use 'perf probe'" part.

- Arnaldo
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