Problem with profiler

Hi.
I was trying to profile my homebrew(port of SDL application) with psp-gprof. But I encountered a problem. Everything was set ok (added:
CFLAGS = -pg, LIBS = -lpspprof, gprof_cleanup() before sceKernelExitGame() ).
My app generated gmon.out.
But after using psp-gprof I got incomplete profile info.
It only shows functions and how many times were each of functions called.
Important informations about time spent in each functions were missing.

Does anyone know what is wrong?

Thanks in advance.