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/*
* Copyright (C) 2025 Jakub Kruszona-Zawadzki, Saglabs SA
*
* This file is part of MooseFS.
*
* MooseFS is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 2 (only).
*
* MooseFS is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with MooseFS; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02111-1301, USA
* or visit http://www.gnu.org/licenses/gpl-2.0.html
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#if defined(GPERFTOOLS) && defined(HAVE_SETITIMER)
#undef HAVE_SETITIMER
#endif
#if defined(HAVE_SETITIMER)
# include <sys/time.h>
# ifndef ITIMER_REAL
# define ITIMER_REAL 0
# endif
# ifndef ITIMER_VIRTUAL
# define ITIMER_VIRTUAL 1
# endif
# ifndef ITIMER_PROF
# define ITIMER_PROF 2
# endif
# define MAXITIMER 999
#endif
#if defined(HAVE_GETRUSAGE)
# include <sys/types.h>
# ifdef HAVE_SYS_RESOURCE_H
# include <sys/resource.h>
# endif
# ifdef HAVE_SYS_RUSAGE_H
# include <sys/rusage.h>
# endif
# ifndef RUSAGE_SELF
# define RUSAGE_SELF 0
# endif
#endif
#if defined(HAVE_GETTIMEOFDAY)
# include <sys/time.h>
#else
# include <time.h>
#endif
#include <stdlib.h>
#include <inttypes.h>
#if defined(HAVE_SETITIMER)
static struct itimerval it_set;
static uint32_t addsec,addusec;
#endif
#if defined(HAVE_GETRUSAGE)
static uint64_t lastautime;
static uint64_t lastastime;
#endif
static uint64_t lastget;
void cpu_init (void) {
#if defined(HAVE_SETITIMER)
struct itimerval rc,uc,pc;
#endif
#if defined(HAVE_GETRUSAGE)
struct rusage rus;
#endif
#if defined(HAVE_GETTIMEOFDAY)
struct timeval tod;
#endif
#if defined(HAVE_GETTIMEOFDAY)
gettimeofday(&tod,NULL);
lastget = tod.tv_sec;
lastget *= UINT64_C(1000000);
lastget += tod.tv_usec;
#else
lastget = time(NULL);
lastget *= UINT64_C(1000000);
#endif
#if defined(HAVE_SETITIMER)
addsec = 0;
addusec = 0;
it_set.it_interval.tv_sec = 0;
it_set.it_interval.tv_usec = 0;
it_set.it_value.tv_sec = MAXITIMER;
it_set.it_value.tv_usec = 999999;
setitimer(ITIMER_REAL,&it_set,&rc); // real time
setitimer(ITIMER_VIRTUAL,&it_set,&uc); // user time
setitimer(ITIMER_PROF,&it_set,&pc); // user time + system time
#endif
#if defined(HAVE_GETRUSAGE)
getrusage(RUSAGE_SELF,&rus);
lastautime = (uint64_t)rus.ru_utime.tv_sec;
lastautime *= UINT64_C(1000000);
lastautime += (uint64_t)rus.ru_utime.tv_usec;
lastastime = (uint64_t)rus.ru_stime.tv_sec;
lastastime *= UINT64_C(1000000);
lastastime += (uint64_t)rus.ru_stime.tv_usec;
#endif
}
void cpu_used (uint64_t *scpu,uint64_t *ucpu) {
#if defined(HAVE_SETITIMER)
struct itimerval rc,uc,pc;
uint64_t ucusec,pcusec;
#endif
#if defined(HAVE_GETRUSAGE)
struct rusage rus;
uint64_t autime,astime;
#endif
uint64_t rdiff,now;
#if defined(HAVE_GETTIMEOFDAY)
struct timeval tod;
#endif
uint64_t systime,usertime;
#if defined(HAVE_GETTIMEOFDAY)
gettimeofday(&tod,NULL);
now = tod.tv_sec;
now *= UINT64_C(1000000);
now += tod.tv_usec;
#else
now = time(NULL);
now *= UINT64_C(1000000);
#endif
if (now>lastget) {
rdiff = now-lastget;
lastget = now;
} else {
rdiff = 0;
}
#if !(defined(HAVE_SETITIMER) || defined(HAVE_GETRUSAGE))
systime = 0;
usertime = 0;
#endif
// mfs_log(MFSLOG_SYSLOG,MFSLOG_DEBUG,"rdiff1: %"PRIu64,rdiff);
#if defined(HAVE_SETITIMER)
/* method 1 - use itimers - usually worse */
setitimer(ITIMER_REAL,&it_set,&rc); // real time
setitimer(ITIMER_VIRTUAL,&it_set,&uc); // user time
setitimer(ITIMER_PROF,&it_set,&pc); // user time + system time
rc.it_value.tv_sec = MAXITIMER-rc.it_value.tv_sec;
rc.it_value.tv_usec = 999999-rc.it_value.tv_usec;
uc.it_value.tv_sec = MAXITIMER-uc.it_value.tv_sec;
uc.it_value.tv_usec = 999999-uc.it_value.tv_usec;
pc.it_value.tv_sec = MAXITIMER-pc.it_value.tv_sec;
pc.it_value.tv_usec = 999999-pc.it_value.tv_usec;
addsec += rc.it_value.tv_sec;
addusec += rc.it_value.tv_usec;
while (addusec>1000000) {
addusec-=1000000;
addsec++;
}
if (rc.it_value.tv_sec>=0 && rc.it_value.tv_usec>=0) {
rdiff = (uint64_t)rc.it_value.tv_sec;
rdiff *= UINT64_C(1000000);
rdiff += (uint64_t)rc.it_value.tv_usec;
}
if (uc.it_value.tv_sec>=0 && pc.it_value.tv_sec>=0 && uc.it_value.tv_usec>=0 && pc.it_value.tv_usec>=0) {
ucusec = (uint64_t)uc.it_value.tv_sec;
ucusec *= UINT64_C(1000000);
ucusec += (uint64_t)uc.it_value.tv_usec;
pcusec = (uint64_t)pc.it_value.tv_sec;
pcusec *= UINT64_C(1000000);
pcusec += (uint64_t)pc.it_value.tv_usec;
} else {
ucusec = 0;
pcusec = 0;
}
if (pcusec>ucusec) {
pcusec-=ucusec;
} else {
pcusec=0;
}
usertime = ucusec;
systime = pcusec;
#endif
// mfs_log(MFSLOG_SYSLOG,MFSLOG_DEBUG,"rdiff2: %"PRIu64,rdiff);
// mfs_log(MFSLOG_SYSLOG,MFSLOG_DEBUG,"usertime1: %"PRIu64",systime1: %"PRIu64,usertime,systime);
#if defined(HAVE_GETRUSAGE)
/* method 2 - use getrusage - usually better (if both are available, overwrites data set by itimer method) */
getrusage(RUSAGE_SELF,&rus);
autime = (uint64_t)rus.ru_utime.tv_sec;
autime *= UINT64_C(1000000);
autime += (uint64_t)rus.ru_utime.tv_usec;
astime = (uint64_t)rus.ru_stime.tv_sec;
astime *= UINT64_C(1000000);
astime += (uint64_t)rus.ru_stime.tv_usec;
if (autime>lastautime) {
usertime = autime - lastautime;
lastautime = autime;
}
if (astime>lastastime) {
systime = astime - lastastime;
lastastime = astime;
}
#endif
// mfs_log(MFSLOG_SYSLOG,MFSLOG_DEBUG,"usertime2: %"PRIu64",systime2: %"PRIu64,usertime,systime);
if (rdiff>0) {
*scpu = (systime*UINT64_C(1000000000)) / rdiff;
*ucpu = (usertime*UINT64_C(1000000000)) / rdiff;
} else {
*scpu = 0;
*ucpu = 0;
}
// mfs_log(MFSLOG_SYSLOG,MFSLOG_DEBUG,"scpu: %"PRIu32",ucpu: %"PRIu32,*scpu,*ucpu);
}
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