Re: [PATCH tracing/kprobes 0/7] tracing/kprobes: kprobe-basedevent tracer update and perf support

[Christoph Hellwig]

On Fri, Sep 11, 2009 at 03:03:35PM -0400, Frank Ch. Eigler wrote:
> Frederic Weisbecker <fweisbec@xxxxxxxxx> writes:
> 
> > [...]  I'm really looking forward seeing this C expression-like
> > kprobe creation tool.  It seems powerful enough to replace printk +
> > kernel rebuild.  No need anymore to write some printk to debug,
> > worrying, [...]
> 
> To a large extent, systemtap had delivered this already some years
> ago, including the cushy ponies dancing in the sunlight.  While such
> low-level machinery is fine, some of our experience indicates that it
> is dramatically easier to use if high-level, symbolic, debugging data
> is used to compute probe locations and variable names/types/locations.

No, systemtap has been for years failing to delivers this in a way that
it could be usefully integrated into the kernel.  Masami's patches are
exactly the kind of low-level functionality we absolutely need in the
kernel tree so that we can built more useful higherlevel tools ontop
of this. 

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