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util: Helper functions to get process info
Move qemuGetProcessInfo and qemuGetSchedInfo methods to util and share them with ch driver. Signed-off-by: Praveen K Paladugu <prapal@linux.microsoft.com> Signed-off-by: Michal Privoznik <mprivozn@redhat.com> Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
This commit is contained in:
Praveen K Paladugu
Michal Privoznik
parent
dc33c82817
commit
d73852c499
@ -3085,8 +3085,10 @@ virProcessGetAffinity;
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virProcessGetMaxMemLock;
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virProcessGetNamespaces;
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virProcessGetPids;
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virProcessGetSchedInfo;
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virProcessGetStartTime;
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virProcessGetStat;
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virProcessGetStatInfo;
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virProcessGroupGet;
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virProcessGroupKill;
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virProcessKill;
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@ -1317,113 +1317,6 @@ qemuGetSchedstatDelay(unsigned long long *cpudelay,
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return 0;
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}
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static int
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qemuGetSchedInfo(unsigned long long *cpuWait,
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pid_t pid, pid_t tid)
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{
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g_autofree char *proc = NULL;
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g_autofree char *data = NULL;
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g_auto(GStrv) lines = NULL;
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size_t i;
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double val;
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*cpuWait = 0;
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/* In general, we cannot assume pid_t fits in int; but /proc parsing
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* is specific to Linux where int works fine. */
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if (tid)
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proc = g_strdup_printf("/proc/%d/task/%d/sched", (int)pid, (int)tid);
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else
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proc = g_strdup_printf("/proc/%d/sched", (int)pid);
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if (!proc)
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return -1;
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/* The file is not guaranteed to exist (needs CONFIG_SCHED_DEBUG) */
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if (access(proc, R_OK) < 0) {
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return 0;
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}
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if (virFileReadAll(proc, (1<<16), &data) < 0)
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return -1;
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lines = g_strsplit(data, "\n", 0);
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if (!lines)
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return -1;
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for (i = 0; lines[i] != NULL; i++) {
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const char *line = lines[i];
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/* Needs CONFIG_SCHEDSTATS. The second check
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* is the old name the kernel used in past */
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if (STRPREFIX(line, "se.statistics.wait_sum") ||
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STRPREFIX(line, "se.wait_sum")) {
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line = strchr(line, ':');
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if (!line) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Missing separator in sched info '%s'"),
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lines[i]);
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return -1;
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}
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line++;
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while (*line == ' ')
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line++;
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if (virStrToDouble(line, NULL, &val) < 0) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Unable to parse sched info value '%s'"),
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line);
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return -1;
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}
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*cpuWait = (unsigned long long)(val * 1000000);
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break;
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}
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}
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return 0;
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}
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static int
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qemuGetProcessInfo(unsigned long long *cpuTime, int *lastCpu, long *vm_rss,
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pid_t pid, pid_t tid)
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{
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g_auto(GStrv) proc_stat = virProcessGetStat(pid, tid);
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unsigned long long usertime = 0, systime = 0;
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long rss = 0;
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int cpu = 0;
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if (!proc_stat ||
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virStrToLong_ullp(proc_stat[VIR_PROCESS_STAT_UTIME], NULL, 10, &usertime) < 0 ||
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virStrToLong_ullp(proc_stat[VIR_PROCESS_STAT_STIME], NULL, 10, &systime) < 0 ||
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virStrToLong_l(proc_stat[VIR_PROCESS_STAT_RSS], NULL, 10, &rss) < 0 ||
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virStrToLong_i(proc_stat[VIR_PROCESS_STAT_PROCESSOR], NULL, 10, &cpu) < 0) {
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VIR_WARN("cannot parse process status data");
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}
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/* We got jiffies
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* We want nanoseconds
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* _SC_CLK_TCK is jiffies per second
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* So calculate thus....
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*/
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if (cpuTime)
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*cpuTime = 1000ull * 1000ull * 1000ull * (usertime + systime)
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/ (unsigned long long)sysconf(_SC_CLK_TCK);
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if (lastCpu)
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*lastCpu = cpu;
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if (vm_rss)
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*vm_rss = rss * virGetSystemPageSizeKB();
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VIR_DEBUG("Got status for %d/%d user=%llu sys=%llu cpu=%d rss=%ld",
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(int)pid, tid, usertime, systime, cpu, rss);
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return 0;
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}
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static int
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qemuDomainHelperGetVcpus(virDomainObj *vm,
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virVcpuInfoPtr info,
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@ -1463,9 +1356,9 @@ qemuDomainHelperGetVcpus(virDomainObj *vm,
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vcpuinfo->number = i;
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vcpuinfo->state = VIR_VCPU_RUNNING;
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if (qemuGetProcessInfo(&vcpuinfo->cpuTime,
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&vcpuinfo->cpu, NULL,
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vm->pid, vcpupid) < 0) {
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if (virProcessGetStatInfo(&vcpuinfo->cpuTime,
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&vcpuinfo->cpu, NULL,
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vm->pid, vcpupid) < 0) {
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virReportSystemError(errno, "%s",
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_("cannot get vCPU placement & pCPU time"));
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return -1;
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@ -1483,7 +1376,7 @@ qemuDomainHelperGetVcpus(virDomainObj *vm,
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}
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if (cpuwait) {
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if (qemuGetSchedInfo(&(cpuwait[ncpuinfo]), vm->pid, vcpupid) < 0)
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if (virProcessGetSchedInfo(&(cpuwait[ncpuinfo]), vm->pid, vcpupid) < 0)
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return -1;
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}
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@ -2626,7 +2519,8 @@ qemuDomainGetInfo(virDomainPtr dom,
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}
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if (virDomainObjIsActive(vm)) {
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if (qemuGetProcessInfo(&(info->cpuTime), NULL, NULL, vm->pid, 0) < 0) {
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if (virProcessGetStatInfo(&(info->cpuTime), NULL, NULL,
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vm->pid, 0) < 0) {
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virReportError(VIR_ERR_OPERATION_FAILED, "%s",
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_("cannot read cputime for domain"));
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goto cleanup;
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@ -10635,7 +10529,7 @@ qemuDomainMemoryStatsInternal(virQEMUDriver *driver,
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ret = 0;
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}
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if (qemuGetProcessInfo(NULL, NULL, &rss, vm->pid, 0) < 0) {
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if (virProcessGetStatInfo(NULL, NULL, &rss, vm->pid, 0) < 0) {
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virReportError(VIR_ERR_OPERATION_FAILED, "%s",
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_("cannot get RSS for domain"));
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} else {
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@ -1764,3 +1764,112 @@ virProcessGetStat(pid_t pid,
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return ret;
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}
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int
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virProcessGetStatInfo(unsigned long long *cpuTime,
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int *lastCpu,
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long *vm_rss,
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pid_t pid,
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pid_t tid)
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{
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g_auto(GStrv) proc_stat = virProcessGetStat(pid, tid);
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unsigned long long usertime = 0, systime = 0;
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long rss = 0;
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int cpu = 0;
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if (!proc_stat ||
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virStrToLong_ullp(proc_stat[VIR_PROCESS_STAT_UTIME], NULL, 10, &usertime) < 0 ||
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virStrToLong_ullp(proc_stat[VIR_PROCESS_STAT_STIME], NULL, 10, &systime) < 0 ||
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virStrToLong_l(proc_stat[VIR_PROCESS_STAT_RSS], NULL, 10, &rss) < 0 ||
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virStrToLong_i(proc_stat[VIR_PROCESS_STAT_PROCESSOR], NULL, 10, &cpu) < 0) {
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VIR_WARN("cannot parse process status data");
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}
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/* We got jiffies
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* We want nanoseconds
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* _SC_CLK_TCK is jiffies per second
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* So calculate thus....
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*/
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if (cpuTime)
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*cpuTime = 1000ull * 1000ull * 1000ull * (usertime + systime)
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/ (unsigned long long) sysconf(_SC_CLK_TCK);
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if (lastCpu)
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*lastCpu = cpu;
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if (vm_rss)
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*vm_rss = rss * virGetSystemPageSizeKB();
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VIR_DEBUG("Got status for %d/%d user=%llu sys=%llu cpu=%d rss=%ld",
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(int) pid, tid, usertime, systime, cpu, rss);
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return 0;
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}
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int
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virProcessGetSchedInfo(unsigned long long *cpuWait,
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pid_t pid,
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pid_t tid)
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{
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g_autofree char *proc = NULL;
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g_autofree char *data = NULL;
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g_auto(GStrv) lines = NULL;
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size_t i;
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double val;
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*cpuWait = 0;
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/* In general, we cannot assume pid_t fits in int; but /proc parsing
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* is specific to Linux where int works fine. */
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if (tid)
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proc = g_strdup_printf("/proc/%d/task/%d/sched", (int) pid, (int) tid);
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else
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proc = g_strdup_printf("/proc/%d/sched", (int) pid);
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if (!proc)
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return -1;
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/* The file is not guaranteed to exist (needs CONFIG_SCHED_DEBUG) */
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if (access(proc, R_OK) < 0) {
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return 0;
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}
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if (virFileReadAll(proc, (1 << 16), &data) < 0)
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return -1;
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lines = g_strsplit(data, "\n", 0);
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if (!lines)
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return -1;
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for (i = 0; lines[i] != NULL; i++) {
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const char *line = lines[i];
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/* Needs CONFIG_SCHEDSTATS. The second check
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* is the old name the kernel used in past */
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if (STRPREFIX(line, "se.statistics.wait_sum") ||
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STRPREFIX(line, "se.wait_sum")) {
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line = strchr(line, ':');
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if (!line) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Missing separator in sched info '%s'"),
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lines[i]);
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return -1;
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}
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line++;
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while (*line == ' ')
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line++;
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if (virStrToDouble(line, NULL, &val) < 0) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Unable to parse sched info value '%s'"),
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line);
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return -1;
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}
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*cpuWait = (unsigned long long) (val * 1000000);
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break;
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}
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}
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return 0;
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}
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@ -193,3 +193,12 @@ typedef enum {
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} virProcessNamespaceFlags;
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int virProcessNamespaceAvailable(unsigned int ns);
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int virProcessGetStatInfo(unsigned long long *cpuTime,
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int *lastCpu,
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long *vm_rss,
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pid_t pid,
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pid_t tid);
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int virProcessGetSchedInfo(unsigned long long *cpuWait,
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pid_t pid,
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pid_t tid);
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