On Wed, Jan 18, 2023 at 10:58:19AM +0100, Michal Privoznik wrote:
We have virDomainGetCPUStats() API which offers querying statistics on host CPU usage by given guest. And it works in two modes: getting overall stats (@start_cpu == -1, @ncpus == 1) or getting per host CPU usage. For the QEMU driver it is implemented by looking into values stored in corresponding cpuacct CGroup controller. Well, this works for system instances, where libvirt has permissions to create CGroups and place QEMU process into them. But it does not fly for session connection, where no CGroups are set up. Fortunately, we can do something similar to v8.8.0-rc1~95 and use virProcessGetStatInfo() to fill the overall stats. Unfortunately, I haven't found any source of per host CPU usage, so we just continue throwing an error in that case. Signed-off-by: Michal Privoznik <mprivozn@xxxxxxxxxx> --- src/qemu/qemu_driver.c | 52 ++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 50 insertions(+), 2 deletions(-) diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index 25c681bfd2..cc10dd87e2 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -16006,6 +16006,50 @@ qemuDomainGetMetadata(virDomainPtr dom, return ret; } +#define QEMU_CPU_STATS_PROC_TOTAL 3 + +static int +qemuDomainGetCPUStatsProc(virDomainObj *vm, + virTypedParameterPtr params, + unsigned int nparams)
The only thing I do not like about this patch is that we would now have both: static int qemuDomainGetCPUStatsProc(virDomainObj *vm, virTypedParameterPtr params, unsigned int nparams) and: static int qemuDomainGetStatsCpuProc(virDomainObj *vm, virTypedParamList *params) doing almost, but not completely, the same thing. And there is no nice way to avoid it. I just haven't noticed in v1, sorry. Or is there a way to converge at least some of these?
+{ + unsigned long long cpuTime = 0; + unsigned long long userTime = 0; + unsigned long long sysTime = 0; + + if (nparams == 0) { + /* return supported number of params */ + return QEMU_CPU_STATS_PROC_TOTAL; + } + + if (virProcessGetStatInfo(&cpuTime, &userTime, &sysTime, + NULL, NULL, vm->pid, 0) < 0) { + virReportError(VIR_ERR_OPERATION_FAILED, "%s", + _("cannot read cputime for domain")); + return -1; + } + + if (virTypedParameterAssign(¶ms[0], VIR_DOMAIN_CPU_STATS_CPUTIME, + VIR_TYPED_PARAM_ULLONG, cpuTime) < 0) + return -1; + + if (nparams > 1 && + virTypedParameterAssign(¶ms[1], VIR_DOMAIN_CPU_STATS_USERTIME, + VIR_TYPED_PARAM_ULLONG, userTime) < 0) + return -1; + + if (nparams > 2 && + virTypedParameterAssign(¶ms[2], VIR_DOMAIN_CPU_STATS_SYSTEMTIME, + VIR_TYPED_PARAM_ULLONG, sysTime) < 0) + return -1; + + if (nparams > 3) + nparams = 3; + + return nparams; +} + +#undef QEMU_CPU_STATS_PROC_TOTAL static int qemuDomainGetCPUStats(virDomainPtr domain, @@ -16034,8 +16078,12 @@ qemuDomainGetCPUStats(virDomainPtr domain, goto cleanup; if (!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPUACCT)) { - virReportError(VIR_ERR_OPERATION_INVALID, - "%s", _("cgroup CPUACCT controller is not mounted")); + if (start_cpu == -1) { + ret = qemuDomainGetCPUStatsProc(vm, params, nparams); + } else { + virReportError(VIR_ERR_OPERATION_INVALID, "%s", + _("cgroup CPUACCT controller is not mounted")); + } goto cleanup; } -- 2.38.2
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