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/*
* getrusage04 - accuracy of getrusage() with RUSAGE_THREAD
*
* This program is used for testing the following upstream commit:
* 761b1d26df542fd5eb348837351e4d2f3bc7bffe.
*
* getrusage() returns cpu resource usage with accuracy of 10ms
* when RUSAGE_THREAD is specified to the argument who. Meanwhile,
* accuracy is 1ms when RUSAGE_SELF is specified. This bad accuracy
* of getrusage() caused a big impact on some application which is
* critical to accuracy of cpu usage. The upstream fix removed
* casts to clock_t in task_u/stime(), to keep granularity of
* cputime_t over the calculation.
*
* Note that the accuracy on powerpc and s390x systems is always
* 10ms when either RUSAGE_THREAD or RUSAGE_SELF specified, so
* this test won't be executed on those platforms.
*
* Copyright (C) 2011 Red Hat, Inc.
* Copyright (C) 2013 Cyril Hrubis <chrubis@suse.cz>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of version 2 of the GNU General Public
* License as published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it
* is free of the rightful claim of any third person regarding
* infringement or the like. Any license provided herein, whether
* implied or otherwise, applies only to this software file. Patent
* licenses, if any, provided herein do not apply to combinations of
* this program with other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
* 02110-1301, USA.
*/
#define _GNU_SOURCE
#include <sys/types.h>
#include <sys/resource.h>
#include <sys/time.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include "test.h"
#include "safe_macros.h"
#include "lapi/posix_clocks.h"
char *TCID = "getrusage04";
int TST_TOTAL = 1;
#define RECORD_MAX 20
#define FACTOR_MAX 10
#ifndef RUSAGE_THREAD
#define RUSAGE_THREAD 1
#endif
static long BIAS_MAX;
static int opt_factor;
static char *factor_str;
static long factor_nr = 1;
option_t child_options[] = {
{"m:", &opt_factor, &factor_str},
{NULL, NULL, NULL}
};
static void fusage(void);
static void busyloop(long wait);
static void setup(void);
static void cleanup(void);
int main(int argc, char *argv[])
{
struct rusage usage;
unsigned long ulast, udelta, slast, sdelta;
int i, lc;
char msg_string[BUFSIZ];
tst_parse_opts(argc, argv, child_options, fusage);
#if (__powerpc__) || (__powerpc64__) || (__s390__) || (__s390x__)
tst_brkm(TCONF, NULL, "This test is not designed for current system");
#endif
setup();
if (opt_factor)
factor_nr = SAFE_STRTOL(cleanup, factor_str, 0, FACTOR_MAX);
tst_resm(TINFO, "Using %ld as multiply factor for max [us]time "
"increment (1000+%ldus)!", factor_nr, BIAS_MAX * factor_nr);
for (lc = 0; TEST_LOOPING(lc); lc++) {
tst_count = 0;
i = 0;
SAFE_GETRUSAGE(cleanup, RUSAGE_THREAD, &usage);
tst_resm(TINFO, "utime:%12luus; stime:%12luus",
usage.ru_utime.tv_usec, usage.ru_stime.tv_usec);
ulast = usage.ru_utime.tv_usec;
slast = usage.ru_stime.tv_usec;
while (i < RECORD_MAX) {
SAFE_GETRUSAGE(cleanup, RUSAGE_THREAD, &usage);
udelta = usage.ru_utime.tv_usec - ulast;
sdelta = usage.ru_stime.tv_usec - slast;
if (udelta > 0 || sdelta > 0) {
i++;
tst_resm(TINFO, "utime:%12luus; stime:%12luus",
usage.ru_utime.tv_usec,
usage.ru_stime.tv_usec);
if ((long)udelta > 1000 + (BIAS_MAX * factor_nr)) {
sprintf(msg_string,
"utime increased > %ldus:",
1000 + BIAS_MAX * factor_nr);
tst_brkm(TFAIL, cleanup, msg_string,
" delta = %luus", udelta);
}
if ((long)sdelta > 1000 + (BIAS_MAX * factor_nr)) {
sprintf(msg_string,
"stime increased > %ldus:",
1000 + BIAS_MAX * factor_nr);
tst_brkm(TFAIL, cleanup, msg_string,
" delta = %luus", sdelta);
}
}
ulast = usage.ru_utime.tv_usec;
slast = usage.ru_stime.tv_usec;
busyloop(100000);
}
}
tst_resm(TPASS, "Test Passed");
cleanup();
tst_exit();
}
static void fusage(void)
{
printf(" -m n use n as multiply factor for max [us]time "
"increment (1000+(1000*n)us),\n default value is 1\n");
}
static void busyloop(long wait)
{
while (wait--) ;
}
/*
* The resolution of getrusage timers currently depends on CONFIG_HZ settings,
* as they are measured in jiffies.
*
* The problem is that there is no reasonable API to get either getrusage
* timers resolution or duration of jiffie.
*
* Here we use clock_getres() with linux specific CLOCK_REALTIME_COARSE (added
* in 2.6.32) which is also based on jiffies. This timer has the same
* granularity as getrusage but it's not guaranteed and it may change in the
* future.
*
* The default value for resolution was choosen to be 4ms as it corresponds to
* CONFIG_HZ=250 which seems to be default value.
*/
static unsigned long guess_timer_resolution(void)
{
struct timespec res;
if (clock_getres(CLOCK_REALTIME_COARSE, &res)) {
tst_resm(TINFO,
"CLOCK_REALTIME_COARSE not supported, using 4000 us");
return 4000;
}
if (res.tv_nsec < 1000000 || res.tv_nsec > 10000000) {
tst_resm(TINFO, "Unexpected CLOCK_REALTIME_COARSE resolution,"
" using 4000 us");
return 4000;
}
tst_resm(TINFO, "Expected timers granularity is %li us",
res.tv_nsec / 1000);
return res.tv_nsec / 1000;
}
static void setup(void)
{
tst_sig(NOFORK, DEF_HANDLER, cleanup);
if (tst_is_virt(VIRT_XEN) || tst_is_virt(VIRT_KVM) || tst_is_virt(VIRT_HYPERV))
tst_brkm(TCONF, NULL, "This testcase is not supported on this"
" virtual machine.");
BIAS_MAX = guess_timer_resolution();
TEST_PAUSE;
}
static void cleanup(void)
{
}
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