On Thursday 10 August 2006 16:40, Daniel Jacobowitz wrote:
> On Thu, Aug 10, 2006 at 04:33:07PM -0400, Mike Frysinger wrote:
> > i'm playing with kgdb and in the process have been learning/writing up
> > little code snippets to make debugging easier ... for example, a small
> > function that will dump the dmesg buffer in kgdb ... now, the issue at
> > hand isnt kgdb :)
>
> Could you build a GDB which includes profiling data (I think it's
> --enable-profile, check gdb/configure.ac) and then use
> maint set profile to generate a profile data file for this?
> It'll tell you where the problem is - probably something is doing
> unnecessary symbol lookup.

attached the output of `gprof` on both runs

fast:
(gdb) maintanence set profile
(gdb) speed-test
(gdb) quit

slow:
(gdb) maintanence set profile
(gdb) file vmlinux
(gdb) speed-test
(gdb) quit
-mike