A vCPU thread always reaches 100% utilization when:
- guest uses idle=poll
- disable HLT vm-exit
- enable MWAIT
Add new guest agent command 'guest-get-cpustats' to get guest CPU
statistics, we can know the guest workload and how busy the CPU is.
Signed-off-by: zhenwei pi <pizhenwei@bytedance.com>
---
qga/commands-posix.c | 89 ++++++++++++++++++++++++++++++++++++++++++++
qga/commands-win32.c | 6 +++
qga/qapi-schema.json | 81 ++++++++++++++++++++++++++++++++++++++++
3 files changed, 176 insertions(+)
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index 0469dc409d..e51f4c8f03 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -2893,6 +2893,90 @@ GuestDiskStatsInfoList *qmp_guest_get_diskstats(Error **errp)
return guest_get_diskstats(errp);
}
+GuestCpuStatsList *qmp_guest_get_cpustats(Error **errp)
+{
+ GuestCpuStatsList *head = NULL, **tail = &head;
+ const char *cpustats = "/proc/stat";
+ int clk_tck = sysconf(_SC_CLK_TCK);
+ FILE *fp;
+ size_t n;
+ char *line = NULL;
+
+ fp = fopen(cpustats, "r");
+ if (fp == NULL) {
+ error_setg_errno(errp, errno, "open(\"%s\")", cpustats);
+ return NULL;
+ }
+
+ while (getline(&line, &n, fp) != -1) {
+ GuestCpuStats *cpustat = NULL;
+ GuestLinuxCpuStats *linuxcpustat;
+ int i;
+ unsigned long user, system, idle, iowait, irq, softirq, steal, guest;
+ unsigned long nice, guest_nice;
+ char name[64];
+
+ i = sscanf(line, "%s %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu",
+ name, &user, &nice, &system, &idle, &iowait, &irq, &softirq,
+ &steal, &guest, &guest_nice);
+
+ /* drop "cpu 1 2 3 ...", get "cpuX 1 2 3 ..." only */
+ if ((i == EOF) || strncmp(name, "cpu", 3) || (name[3] == '\0')) {
+ continue;
+ }
+
+ if (i < 5) {
+ slog("Parsing cpu stat from %s failed, see \"man proc\"", cpustats);
+ break;
+ }
+
+ cpustat = g_new0(GuestCpuStats, 1);
+ cpustat->type = GUEST_OS_TYPE_LINUXOS;
+
+ linuxcpustat = &cpustat->u.linuxos;
+ linuxcpustat->cpu = atoi(&name[3]);
+ linuxcpustat->user = user * 1000 / clk_tck;
+ linuxcpustat->nice = nice * 1000 / clk_tck;
+ linuxcpustat->system = system * 1000 / clk_tck;
+ linuxcpustat->idle = idle * 1000 / clk_tck;
+
+ if (i > 5) {
+ linuxcpustat->has_iowait = true;
+ linuxcpustat->iowait = iowait * 1000 / clk_tck;
+ }
+
+ if (i > 6) {
+ linuxcpustat->has_irq = true;
+ linuxcpustat->irq = irq * 1000 / clk_tck;
+ linuxcpustat->has_softirq = true;
+ linuxcpustat->softirq = softirq * 1000 / clk_tck;
+ }
+
+ if (i > 8) {
+ linuxcpustat->has_steal = true;
+ linuxcpustat->steal = steal * 1000 / clk_tck;
+ }
+
+ if (i > 9) {
+ linuxcpustat->has_guest = true;
+ linuxcpustat->guest = guest * 1000 / clk_tck;
+ }
+
+ if (i > 10) {
+ linuxcpustat->has_guest = true;
+ linuxcpustat->guest = guest * 1000 / clk_tck;
+ linuxcpustat->has_guestnice = true;
+ linuxcpustat->guestnice = guest_nice * 1000 / clk_tck;
+ }
+
+ QAPI_LIST_APPEND(tail, cpustat);
+ }
+
+ free(line);
+ fclose(fp);
+ return head;
+}
+
#else /* defined(__linux__) */
void qmp_guest_suspend_disk(Error **errp)
@@ -3247,6 +3331,11 @@ GuestDiskStatsInfoList *qmp_guest_get_diskstats(Error **errp)
return NULL;
}
+GuestCpuStatsList *qmp_guest_get_cpustats(Error **errp)
+{
+ error_setg(errp, QERR_UNSUPPORTED);
+ return NULL;
+}
#endif /* CONFIG_FSFREEZE */
diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index 36f94c0f9c..7ed7664715 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -2543,3 +2543,9 @@ GuestDiskStatsInfoList *qmp_guest_get_diskstats(Error **errp)
error_setg(errp, QERR_UNSUPPORTED);
return NULL;
}
+
+GuestCpuStatsList *qmp_guest_get_cpustats(Error **errp)
+{
+ error_setg(errp, QERR_UNSUPPORTED);
+ return NULL;
+}
diff --git a/qga/qapi-schema.json b/qga/qapi-schema.json
index 9fa20e791b..3b795222e9 100644
--- a/qga/qapi-schema.json
+++ b/qga/qapi-schema.json
@@ -1576,3 +1576,84 @@
{ 'command': 'guest-get-diskstats',
'returns': ['GuestDiskStatsInfo']
}
+
+##
+# @GuestOsType:
+#
+# An enumeration of OS type
+#
+# Since: 7.1
+##
+{ 'enum': 'GuestOsType',
+ 'data': [ 'linuxos', 'windowsos' ] }
I would rather keep this enum specific to GuestCpuStats, "GuestLinuxCpuStatsType"?