[libvirt] [PATCH 6/6] virNodeGetMemoryStats: Implement linux support
Minoru Usui
usui at mxm.nes.nec.co.jp
Wed May 25 09:03:57 UTC 2011
virNodeGetMemoryStats: Implement linux support
Signed-off-by: Minoru Usui <usui at mxm.nes.nec.co.jp>
---
src/libvirt_private.syms | 1 +
src/lxc/lxc_driver.c | 1 +
src/nodeinfo.c | 97 ++++++++++++++++++++++++++++++++++++++++++++++
src/nodeinfo.h | 4 ++
src/qemu/qemu_driver.c | 1 +
src/uml/uml_driver.c | 1 +
6 files changed, 105 insertions(+), 0 deletions(-)
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index 4cb8dda..5e55cf1 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -689,6 +689,7 @@ virNodeDeviceObjUnlock;
# nodeinfo.h
nodeCapsInitNUMA;
+nodeGetMemoryStats;
nodeGetCellsFreeMemory;
nodeGetFreeMemory;
nodeGetInfo;
diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c
index 9e09c95..41b6260 100644
--- a/src/lxc/lxc_driver.c
+++ b/src/lxc/lxc_driver.c
@@ -2754,6 +2754,7 @@ static virDriver lxcDriver = {
.domainGetSchedulerParameters = lxcGetSchedulerParameters, /* 0.5.0 */
.domainSetSchedulerParameters = lxcSetSchedulerParameters, /* 0.5.0 */
.domainInterfaceStats = lxcDomainInterfaceStats, /* 0.7.3 */
+ .nodeGetMemoryStats = nodeGetMemoryStats, /* 0.9.2 */
.nodeGetCellsFreeMemory = nodeGetCellsFreeMemory, /* 0.6.5 */
.nodeGetFreeMemory = nodeGetFreeMemory, /* 0.6.5 */
.domainEventRegister = lxcDomainEventRegister, /* 0.7.0 */
diff --git a/src/nodeinfo.c b/src/nodeinfo.c
index f55c83e..63d7822 100644
--- a/src/nodeinfo.c
+++ b/src/nodeinfo.c
@@ -57,11 +57,17 @@
#ifdef __linux__
# define CPUINFO_PATH "/proc/cpuinfo"
# define CPU_SYS_PATH "/sys/devices/system/cpu"
+# define MEMINFO_PATH "/proc/meminfo"
+
+# define LINUX_NB_MEMORY_STATS 4
/* NB, this is not static as we need to call it from the testsuite */
int linuxNodeInfoCPUPopulate(FILE *cpuinfo,
virNodeInfoPtr nodeinfo,
bool need_hyperthreads);
+int linuxNodeGetMemoryStats(FILE *meminfo,
+ virMemoryStatsPtr params,
+ int *nparams);
/* Return the positive decimal contents of the given
* CPU_SYS_PATH/cpu%u/FILE, or -1 on error. If MISSING_OK and the
@@ -378,6 +384,71 @@ int linuxNodeInfoCPUPopulate(FILE *cpuinfo,
return 0;
}
+int linuxNodeGetMemoryStats(FILE *meminfo,
+ virMemoryStatsPtr params,
+ int *nparams)
+{
+ int ret = -1;
+ int i = 0, j = 0;
+ char line[1024];
+ char meminfo_hdr[VIR_MEMORY_STATS_FIELD_LENGTH];
+ unsigned long val;
+ struct field_conv {
+ const char *meminfo_hdr; // meminfo header
+ const char *field; // MemoryStats field name
+ } field_conv[] = {
+ {"MemTotal:", VIR_MEMORY_STATS_TOTAL},
+ {"MemFree:", VIR_MEMORY_STATS_FREE},
+ {"Buffers:", VIR_MEMORY_STATS_BUFFERS},
+ {"Cached:", VIR_MEMORY_STATS_CACHED},
+ {NULL, NULL}
+ };
+
+ if ((*nparams) == 0) {
+ /* Current number of memory stats supported by linux */
+ *nparams = LINUX_NB_MEMORY_STATS;
+ ret = 0;
+ goto cleanup;
+ }
+
+ if ((*nparams) != LINUX_NB_MEMORY_STATS) {
+ nodeReportError(VIR_ERR_INVALID_ARG,
+ "%s", _("Invalid stats count"));
+ goto cleanup;
+ }
+
+ while (fgets(line, sizeof(line), meminfo) != NULL) {
+ char *buf = line;
+
+ if (sscanf(buf, "%s %lu kB", meminfo_hdr, &val) < 2) {
+ continue;
+ }
+
+ for (j = 0; field_conv[j].meminfo_hdr != NULL; j++) {
+ struct field_conv *convp = &field_conv[j];
+
+ if (STREQ(meminfo_hdr, convp->meminfo_hdr)) {
+ virMemoryStatsPtr param = ¶ms[i++];
+
+ if (virStrcpyStatic(param->field, convp->field) == NULL) {
+ nodeReportError(VIR_ERR_INTERNAL_ERROR,
+ "%s", _("Field kernel memory too long for destination"));
+ goto cleanup;
+ }
+ param->value = val;
+ break;
+ }
+ }
+ }
+
+ ret = 0;
+ goto cleanup;
+
+ nodeReportError(VIR_ERR_INTERNAL_ERROR, "%s", _("no \'cpu \' line found"));
+
+cleanup:
+ return ret;
+}
#endif
int nodeGetInfo(virConnectPtr conn ATTRIBUTE_UNUSED, virNodeInfoPtr nodeinfo) {
@@ -416,6 +487,32 @@ int nodeGetInfo(virConnectPtr conn ATTRIBUTE_UNUSED, virNodeInfoPtr nodeinfo) {
#endif
}
+int nodeGetMemoryStats(virConnectPtr conn ATTRIBUTE_UNUSED,
+ virMemoryStatsPtr params,
+ int *nparams,
+ unsigned int flags ATTRIBUTE_UNUSED)
+{
+#ifdef __linux__
+ {
+ int ret;
+ FILE *meminfo = fopen(MEMINFO_PATH, "r");
+ if (!meminfo) {
+ virReportSystemError(errno,
+ _("cannot open %s"), MEMINFO_PATH);
+ return -1;
+ }
+ ret = linuxNodeGetMemoryStats(meminfo, params, nparams);
+ VIR_FORCE_FCLOSE(meminfo);
+
+ return ret;
+ }
+#else
+ nodeReportError(VIR_ERR_NO_SUPPORT, "%s",
+ _("node memory stats not implemented on this platform"));
+ return -1;
+#endif
+}
+
#if HAVE_NUMACTL
# if LIBNUMA_API_VERSION <= 1
# define NUMA_MAX_N_CPUS 4096
diff --git a/src/nodeinfo.h b/src/nodeinfo.h
index 88bac6c..6e69f76 100644
--- a/src/nodeinfo.h
+++ b/src/nodeinfo.h
@@ -28,6 +28,10 @@
# include "capabilities.h"
int nodeGetInfo(virConnectPtr conn, virNodeInfoPtr nodeinfo);
+int nodeGetMemoryStats(virConnectPtr conn ATTRIBUTE_UNUSED,
+ virMemoryStatsPtr params,
+ int *nparams,
+ unsigned int flags ATTRIBUTE_UNUSED);
int nodeCapsInitNUMA(virCapsPtr caps);
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 576393e..cc930c8 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -7734,6 +7734,7 @@ static virDriver qemuDriver = {
.domainBlockPeek = qemudDomainBlockPeek, /* 0.4.4 */
.domainMemoryPeek = qemudDomainMemoryPeek, /* 0.4.4 */
.domainGetBlockInfo = qemuDomainGetBlockInfo, /* 0.8.1 */
+ .nodeGetMemoryStats = nodeGetMemoryStats, /* 0.9.2 */
.nodeGetCellsFreeMemory = nodeGetCellsFreeMemory, /* 0.4.4 */
.nodeGetFreeMemory = nodeGetFreeMemory, /* 0.4.4 */
.domainEventRegister = qemuDomainEventRegister, /* 0.5.0 */
diff --git a/src/uml/uml_driver.c b/src/uml/uml_driver.c
index 536cd8c..6987d05 100644
--- a/src/uml/uml_driver.c
+++ b/src/uml/uml_driver.c
@@ -2218,6 +2218,7 @@ static virDriver umlDriver = {
.domainGetAutostart = umlDomainGetAutostart, /* 0.5.0 */
.domainSetAutostart = umlDomainSetAutostart, /* 0.5.0 */
.domainBlockPeek = umlDomainBlockPeek, /* 0.5.0 */
+ .nodeGetMemoryStats = nodeGetMemoryStats, /* 0.9.2 */
.nodeGetCellsFreeMemory = nodeGetCellsFreeMemory, /* 0.5.0 */
.nodeGetFreeMemory = nodeGetFreeMemory, /* 0.5.0 */
.isEncrypted = umlIsEncrypted, /* 0.7.3 */
--
1.7.1
More information about the libvir-list
mailing list