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/*
* self.c - example of a simple self monitoring task
*
* Copyright (c) 2009 Google, Inc
* Contributed by Stephane Eranian <eranian@gmail.com>
*
* Based on:
* Copyright (c) 2002-2007 Hewlett-Packard Development Company, L.P.
* Contributed by Stephane Eranian <eranian@hpl.hp.com>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
* of the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
* INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
* PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
* CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE
* OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*
* This file is part of libpfm, a performance monitoring support library for
* applications on Linux.
*/
#include <sys/types.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <errno.h>
#include <unistd.h>
#include <string.h>
#include <signal.h>
#include <locale.h>
#include <sys/prctl.h>
#include <err.h>
#include <perfmon/pfmlib_perf_event.h>
#include "perf_util.h"
static const char *gen_events[]={
"cycles:u",
"instructions:u",
NULL
};
static volatile int quit;
void sig_handler(int n)
{
quit = 1;
}
void
noploop(void)
{
for(;quit == 0;);
}
static void
print_counts(perf_event_desc_t *fds, int num_fds, const char *msg)
{
uint64_t val;
uint64_t values[3];
double ratio;
int i;
ssize_t ret;
/*
* now read the results. We use pfp_event_count because
* libpfm guarantees that counters for the events always
* come first.
*/
memset(values, 0, sizeof(values));
for (i = 0; i < num_fds; i++) {
ret = read(fds[i].fd, values, sizeof(values));
if (ret < (ssize_t)sizeof(values)) {
if (ret == -1)
err(1, "cannot read results: %s", strerror(errno));
else
warnx("could not read event%d", i);
}
/*
* scaling is systematic because we may be sharing the PMU and
* thus may be multiplexed
*/
val = perf_scale(values);
ratio = perf_scale_ratio(values);
printf("%s %'20"PRIu64" %s (%.2f%% scaling, raw=%'"PRIu64", ena=%'"PRIu64", run=%'"PRIu64")\n",
msg,
val,
fds[i].name,
(1.0-ratio)*100.0,
values[0],
values[1],
values[2]);
}
}
int
main(int argc, char **argv)
{
perf_event_desc_t *fds = NULL;
int i, ret, num_fds = 0;
setlocale(LC_ALL, "");
/*
* Initialize pfm library (required before we can use it)
*/
ret = pfm_initialize();
if (ret != PFM_SUCCESS)
errx(1, "Cannot initialize library: %s", pfm_strerror(ret));
ret = perf_setup_argv_events(argc > 1 ? (const char **)argv+1 : gen_events, &fds, &num_fds);
if (ret || !num_fds)
errx(1, "cannot setup events");
fds[0].fd = -1;
for(i=0; i < num_fds; i++) {
/* request timing information necessary for scaling */
fds[i].hw.read_format = PERF_FORMAT_SCALE;
fds[i].hw.disabled = 1; /* do not start now */
/* each event is in an independent group (multiplexing likely) */
fds[i].fd = perf_event_open(&fds[i].hw, 0, -1, -1, 0);
if (fds[i].fd == -1)
err(1, "cannot open event %d", i);
}
signal(SIGALRM, sig_handler);
/*
* enable all counters attached to this thread and created by it
*/
ret = prctl(PR_TASK_PERF_EVENTS_ENABLE);
if (ret)
err(1, "prctl(enable) failed");
print_counts(fds, num_fds, "INITIAL: ");
alarm(10);
noploop();
/*
* disable all counters attached to this thread
*/
ret = prctl(PR_TASK_PERF_EVENTS_DISABLE);
if (ret)
err(1, "prctl(disable) failed");
printf("Final counts:\n");
print_counts(fds, num_fds, "FINAL: ");
for (i = 0; i < num_fds; i++)
close(fds[i].fd);
perf_free_fds(fds, num_fds);
/* free libpfm resources cleanly */
pfm_terminate();
return 0;
}
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