In order to debug with callgrind, you need to add a couple of code
fragments around the section of code you are profiling.  This is
easiest if you can find the function that invokes the routine(s) you
want to profile, add the following code around the function call of
interest.

Add the following to the start of the file:

	#include <valgrind/callgrind.h>

Add the following to the start of the calling function:

	static GTimeVal start, end;

Add the following just before the function of interest:

	g_print("Start timing.\n");
	g_get_current_time(&start);
	CALLGRIND_START_INSTRUMENTATION();
	CALLGRIND_TOGGLE_COLLECT();

Add the following just after the function of interest:

	CALLGRIND_TOGGLE_COLLECT();
	CALLGRIND_STOP_INSTRUMENTATION();
	g_get_current_time(&end);
	if (start.tv_usec > end.tv_usec) {
	  end.tv_usec += 1000000;
	  end.tv_sec  -= 1;
	}
	g_print("Callgrind enabled for %d.%6d seconds.\n",
		 (int)(end.tv_sec - start.tv_sec),
		 (int)(end.tv_usec - start.tv_usec));

You will need to recompile, and then run the 'gnucash-valgrind'
wrapper script instead of the normal 'gnucash' script.

NOTE: Version 3.2 of valgrind has changed the above macros to no
longer take an argument. In order to compile with this version of
valgrind you will need to remove the trailing parentheses and
semicolon.