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util: Extend virProcessGetStatInfo() for sysTime and userTime

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The virProcessGetStatInfo() helper parses /proc stat file for
given PID and/or TID and reports cumulative cpuTime which is just
a sum of user and sys times. But in near future, we'll need those
times separately, so make the function return them too (if caller
desires).

Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
This commit is contained in:
Michal Privoznik 2022-08-09 16:15:55 +02:00
parent b59285e089
commit cdc22d9a21
4 changed files with 28 additions and 12 deletions
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1
src/ch/ch_driver.c
View File

@ -1075,6 +1075,7 @@ chDomainHelperGetVcpus(virDomainObj *vm,
vcpuinfo->number = i;
vcpuinfo->state = VIR_VCPU_RUNNING;
if (virProcessGetStatInfo(&vcpuinfo->cpuTime,
NULL, NULL,
&vcpuinfo->cpu, NULL,
vm->pid, vcpupid) < 0) {
virReportSystemError(errno, "%s",

4
src/qemu/qemu_driver.c
View File

@ -1360,6 +1360,7 @@ qemuDomainHelperGetVcpus(virDomainObj *vm,
vcpuinfo->state = VIR_VCPU_RUNNING;
if (virProcessGetStatInfo(&vcpuinfo->cpuTime,
NULL, NULL,
&vcpuinfo->cpu, NULL,
vm->pid, vcpupid) < 0) {
virReportSystemError(errno, "%s",
@ -2516,6 +2517,7 @@ qemuDomainGetInfo(virDomainPtr dom,
if (virDomainObjIsActive(vm)) {
if (virProcessGetStatInfo(&(info->cpuTime), NULL, NULL,
NULL, NULL,
vm->pid, 0) < 0) {
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("cannot read cputime for domain"));
@ -10676,7 +10678,7 @@ qemuDomainMemoryStatsInternal(virDomainObj *vm,
ret = 0;
}
if (virProcessGetStatInfo(NULL, NULL, &rss, vm->pid, 0) < 0) {
if (virProcessGetStatInfo(NULL, NULL, NULL, NULL, &rss, vm->pid, 0) < 0) {
virReportError(VIR_ERR_OPERATION_FAILED, "%s",
_("cannot get RSS for domain"));
} else {

33
src/util/virprocess.c
View File

@ -1737,32 +1737,37 @@ virProcessGetStat(pid_t pid,
#ifdef __linux__
int
virProcessGetStatInfo(unsigned long long *cpuTime,
unsigned long long *userTime,
unsigned long long *sysTime,
int *lastCpu,
long *vm_rss,
pid_t pid,
pid_t tid)
{
g_auto(GStrv) proc_stat = virProcessGetStat(pid, tid);
unsigned long long usertime = 0, systime = 0;
unsigned long long utime = 0;
unsigned long long stime = 0;
const unsigned long long jiff2nsec = 1000ull * 1000ull * 1000ull /
(unsigned long long) sysconf(_SC_CLK_TCK);
long rss = 0;
int cpu = 0;
if (!proc_stat ||
virStrToLong_ullp(proc_stat[VIR_PROCESS_STAT_UTIME], NULL, 10, &usertime) < 0 ||
virStrToLong_ullp(proc_stat[VIR_PROCESS_STAT_STIME], NULL, 10, &systime) < 0 ||
virStrToLong_ullp(proc_stat[VIR_PROCESS_STAT_UTIME], NULL, 10, &utime) < 0 ||
virStrToLong_ullp(proc_stat[VIR_PROCESS_STAT_STIME], NULL, 10, &stime) < 0 ||
virStrToLong_l(proc_stat[VIR_PROCESS_STAT_RSS], NULL, 10, &rss) < 0 ||
virStrToLong_i(proc_stat[VIR_PROCESS_STAT_PROCESSOR], NULL, 10, &cpu) < 0) {
VIR_WARN("cannot parse process status data");
}
/* We got jiffies
* We want nanoseconds
* _SC_CLK_TCK is jiffies per second
* So calculate thus....
*/
utime *= jiff2nsec;
stime *= jiff2nsec;
if (cpuTime)
*cpuTime = 1000ull * 1000ull * 1000ull * (usertime + systime)
/ (unsigned long long) sysconf(_SC_CLK_TCK);
*cpuTime = utime + stime;
if (userTime)
*userTime = utime;
if (sysTime)
*sysTime = stime;
if (lastCpu)
*lastCpu = cpu;
@ -1771,7 +1776,7 @@ virProcessGetStatInfo(unsigned long long *cpuTime,
VIR_DEBUG("Got status for %d/%d user=%llu sys=%llu cpu=%d rss=%ld",
(int) pid, tid, usertime, systime, cpu, rss);
(int) pid, tid, utime, stime, cpu, rss);
return 0;
}
@ -1844,6 +1849,8 @@ virProcessGetSchedInfo(unsigned long long *cpuWait,
#else
int
virProcessGetStatInfo(unsigned long long *cpuTime,
unsigned long long *userTime,
unsigned long long *sysTime,
int *lastCpu,
long *vm_rss,
pid_t pid G_GNUC_UNUSED,
@ -1853,6 +1860,10 @@ virProcessGetStatInfo(unsigned long long *cpuTime,
* platforms, so just report neutral values */
if (cpuTime)
*cpuTime = 0;
if (userTime)
*userTime = 0;
if (sysTime)
*sysTime = 0;
if (lastCpu)
*lastCpu = 0;
if (vm_rss)

2
src/util/virprocess.h
View File

@ -195,6 +195,8 @@ typedef enum {
int virProcessNamespaceAvailable(unsigned int ns);
int virProcessGetStatInfo(unsigned long long *cpuTime,
unsigned long long *userTime,
unsigned long long *sysTime,
int *lastCpu,
long *vm_rss,
pid_t pid,