[libvirt] [PATCH RFC 2/7] libxl: implement virDomainMemorystats
Introduce support for domainMemoryStats API call, which
consequently enables the use of `virsh dommemstat` command to
query for memory statistics of a domain. We support
the following statistics: balloon info, available and currently
in use. swap-in, swap-out, major-faults, minor-faults require
cooperation of the guest and thus currently not supported.
We build on the data returned from libxl_domain_info and deliver
it in the virDomainMemoryStat format.
Signed-off-by: Joao Martins <joao.m.martins(a)oracle.com>
---
src/libxl/libxl_driver.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 68 insertions(+)
diff --git a/src/libxl/libxl_driver.c b/src/libxl/libxl_driver.c
index 101e4c7..43e9e47 100644
--- a/src/libxl/libxl_driver.c
+++ b/src/libxl/libxl_driver.c
@@ -4747,6 +4747,73 @@ libxlDomainGetCPUStats(virDomainPtr dom,
return ret;
}
+#define LIBXL_SET_MEMSTAT(TAG, VAL) \
+ if (i < nr_stats) { \
+ stats[i].tag = TAG; \
+ stats[i].val = VAL; \
+ i++; \
+ }
+
+static int
+libxlDomainMemoryStats(virDomainPtr dom,
+ virDomainMemoryStatPtr stats,
+ unsigned int nr_stats,
+ unsigned int flags)
+{
+ libxlDriverPrivatePtr driver = dom->conn->privateData;
+ libxlDriverConfigPtr cfg = libxlDriverConfigGet(driver);
+ virDomainObjPtr vm;
+ libxl_dominfo d_info;
+ unsigned mem, maxmem;
+ size_t i = 0;
+ int ret = -1;
+
+ virCheckFlags(0, -1);
+
+ if (!(vm = libxlDomObjFromDomain(dom)))
+ goto cleanup;
+
+ if (virDomainMemoryStatsEnsureACL(dom->conn, vm->def) < 0)
+ goto cleanup;
+
+ if (libxlDomainObjBeginJob(driver, vm, LIBXL_JOB_QUERY) < 0)
+ goto cleanup;
+
+ if (!virDomainObjIsActive(vm)) {
+ virReportError(VIR_ERR_OPERATION_INVALID,
+ "%s", _("domain is not running"));
+ goto endjob;
+ }
+
+ if (libxl_domain_info(cfg->ctx, &d_info, vm->def->id) != 0) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("libxl_domain_info failed for domain '%d'"),
+ vm->def->id);
+ return -1;
+ }
+ mem = d_info.current_memkb;
+ maxmem = d_info.max_memkb;
+
+ LIBXL_SET_MEMSTAT(VIR_DOMAIN_MEMORY_STAT_ACTUAL_BALLOON, maxmem - mem);
+ LIBXL_SET_MEMSTAT(VIR_DOMAIN_MEMORY_STAT_AVAILABLE, maxmem);
+ LIBXL_SET_MEMSTAT(VIR_DOMAIN_MEMORY_STAT_RSS, mem);
+
+ ret = i;
+
+ endjob:
+ if (!libxlDomainObjEndJob(driver, vm)) {
+ virObjectUnlock(vm);
+ vm = NULL;
+ }
+
+ cleanup:
+ if (vm)
+ virObjectUnlock(vm);
+ return ret;
+}
+
+#undef LIBXL_SET_MEMSTAT
+
static int
libxlConnectDomainEventRegisterAny(virConnectPtr conn, virDomainPtr dom, int eventID,
virConnectDomainEventGenericCallback callback,
@@ -5340,6 +5407,7 @@ static virHypervisorDriver libxlHypervisorDriver = {
#endif
.nodeGetFreeMemory = libxlNodeGetFreeMemory, /* 0.9.0 */
.nodeGetCellsFreeMemory = libxlNodeGetCellsFreeMemory, /* 1.1.1 */
+ .domainMemoryStats = libxlDomainMemoryStats, /* 1.2.20 */
.domainGetCPUStats = libxlDomainGetCPUStats, /* 1.2.20 */
.connectDomainEventRegister = libxlConnectDomainEventRegister, /* 0.9.0 */
.connectDomainEventDeregister = libxlConnectDomainEventDeregister, /* 0.9.0 */
--
2.1.4