libdb/util/systemtap/apitimes.stp

#!/usr/bin/stap
/*
 * Copyright (c) 2011, 2012 Oracle and/or its affiliates.  All rights reserved.
 *
 * apitimes - Graph the time spent in DB API calls grouped by thread or processid
 *
 * The path to the DB library is required to be the first argument.
 *
 * To limit tracing to a particular process use one of the stap options:
 *	-x <pid> or
 *	-c "<program> [<program arguments>..]"
 *
 */

global functioncount, maxcount, starts, times;

probe begin
{
	functioncount = 0;
	maxcount = -1;
	%( $# >= 2 %? maxcount = $2 %)
	printf("DB API times of ");
	if (target() == 0)
		printf("processes using \"%s\"", @1)
	else
		printf("process %d", target());
	printf(" grouped by function; interrupt to display summary\n");
}

probe process(@1).function("db*_create").call,
      process(@1).function("__*_pp").call
{
	starts[tid(), probefunc()] = gettimeofday_ns();
}

      
probe process(@1).function("db*_create").return,
      process(@1).function("__*_pp").return
{
	if ((start = starts[tid(), probefunc()]) != 0) {
		times[tid(), probefunc()] <<< gettimeofday_ns() - start;
		if (++functioncount == maxcount)
			exit();
	}
}

probe end
{
	foreach ([tid, func] in times) {
		printf("Times that thread %x spent in %s in nanoseconds\n",
		    tid, func);
		print(@hist_log(times[tid, func]));
	}
}