Re: [PATCH] Linux Kernel Markers

[Richard J Moore <richardj_moore@uk.ibm.com>]

Martin Bligh <mbligh@google.com> wrote on 19/09/2006 17:04:43:

> Frank Ch. Eigler wrote:
> > Hi -
> >
> > On Tue, Sep 19, 2006 at 08:11:40AM -0700, Martin J. Bligh wrote:
> >
> >
> >>[...]  Why don't we just copy the whole damned function somewhere
> >>else, and make an instrumented copy (as a kernel module)? Then
> >>reroute all the function calls through it [...]
> >
> >
> > Interesting idea.  Are you imagining this instrumented copy being
> > built at kernel compile time (something like building a "-g -O0"
> > parallel)?  Or compiled anew from original sources after deployment?
> > Or on-the-fly binary-level rewriting a la SPIN?
>
> "compiled anew from original sources after deployment" seems the most
> practical to do to me. From second hand info on using systemtap, you
> seem to need the same compiler and source tree to work from anyway, so
> this doesn't seem much of a burden.
>

If I'm not mistaken, this has been done before under the guise of dynamic
patch. Doesn't Solaris have the capability? I'm certain that some UNIXes do
as well as non-UNIX O/Ss.

Richard

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