[libvirt] [PATCHv3 6/8] qemu: bulk stats: implement block group
Francesco Romani
fromani at redhat.com
Mon Sep 8 13:05:50 UTC 2014
This patch implements the VIR_DOMAIN_STATS_BLOCK
group of statistics.
To do so, an helper function to get the block stats
of all the disks of a domain is added.
Signed-off-by: Francesco Romani <fromani at redhat.com>
---
include/libvirt/libvirt.h.in | 1 +
src/libvirt.c | 17 ++++++
src/qemu/qemu_driver.c | 93 +++++++++++++++++++++++++++++
src/qemu/qemu_monitor.c | 22 +++++++
src/qemu/qemu_monitor.h | 20 +++++++
src/qemu/qemu_monitor_json.c | 135 ++++++++++++++++++++++++++++++-------------
src/qemu/qemu_monitor_json.h | 4 ++
src/qemu/qemu_monitor_text.c | 13 +++++
src/qemu/qemu_monitor_text.h | 4 ++
9 files changed, 269 insertions(+), 40 deletions(-)
diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
index 93aa1fb..c8e0089 100644
--- a/include/libvirt/libvirt.h.in
+++ b/include/libvirt/libvirt.h.in
@@ -2515,6 +2515,7 @@ typedef enum {
VIR_DOMAIN_STATS_BALLOON = (1 << 2), /* return domain balloon info */
VIR_DOMAIN_STATS_VCPU = (1 << 3), /* return domain virtual CPU info */
VIR_DOMAIN_STATS_INTERFACE = (1 << 4), /* return domain interfaces info */
+ VIR_DOMAIN_STATS_BLOCK = (1 << 5), /* return domain block info */
} virDomainStatsTypes;
typedef enum {
diff --git a/src/libvirt.c b/src/libvirt.c
index 8aa6cb1..e041fa2 100644
--- a/src/libvirt.c
+++ b/src/libvirt.c
@@ -21596,6 +21596,23 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* "net.<num>.tx.errs" - transmission errors as long long.
* "net.<num>.tx.drop" - transmit packets dropped as long long.
*
+ * VIR_DOMAIN_STATS_BLOCK: Return block devices statistics.
+ * The typed parameter keys are in this format:
+ * "block.count" - number of block devices on this domain
+ * as unsigned int.
+ * "block.<num>.name" - name of the block device <num> as string.
+ * matches the name of the block device.
+ * "block.<num>.rd.reqs" - number of read requests as long long.
+ * "block.<num>.rd.bytes" - number of read bytes as long long.
+ * "block.<num>.rd.times" - total time (ns) spent on reads as long long.
+ * "block.<num>.wr.reqs" - number of write requests as long long.
+ * "block.<num>.wr.bytes" - number of written bytes as long long.
+ * "block.<num>.wr.times" - total time (ns) spent on writes as long long.
+ * "block.<num>.fl.reqs" - total flush requests as long long.
+ * "block.<num>.fl.times" - total time (ns) spent on cache flushing
+ * as long long.
+ * "block.<num>.errors" - Xen only: the 'oo_req' value as long long.
+ *
* Using 0 for @stats returns all stats groups supported by the given
* hypervisor.
*
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 989eb3e..93afb7e 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9678,6 +9678,31 @@ qemuDomainBlockStats(virDomainPtr dom,
return ret;
}
+
+/*
+ * Returns at most the first `nstats' stats, then stops.
+ * Returns the number of stats filled.
+ */
+static int
+qemuDomainHelperGetBlockStats(virQEMUDriverPtr driver,
+ virDomainObjPtr vm,
+ qemuBlockStatsPtr stats,
+ int nstats)
+{
+ int ret;
+ qemuDomainObjPrivatePtr priv = vm->privateData;
+
+ qemuDomainObjEnterMonitor(driver, vm);
+
+ ret = qemuMonitorGetAllBlockStatsInfo(priv->mon, NULL,
+ stats, nstats);
+
+ qemuDomainObjExitMonitor(driver, vm);
+
+ return ret;
+}
+
+
static int
qemuDomainBlockStatsFlags(virDomainPtr dom,
const char *path,
@@ -17620,6 +17645,73 @@ qemuDomainGetStatsInterface(virConnectPtr conn ATTRIBUTE_UNUSED,
#undef QEMU_ADD_NET_PARAM
+#define QEMU_ADD_BLOCK_PARAM_LL(record, maxparams, num, name, value) \
+do { \
+ char param_name[VIR_TYPED_PARAM_FIELD_LENGTH]; \
+ snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH, \
+ "block.%lu.%s", num, name); \
+ if (virTypedParamsAddLLong(&(record)->params, \
+ &(record)->nparams, \
+ maxparams, \
+ param_name, \
+ value) < 0) \
+ goto cleanup; \
+} while (0)
+
+static int
+qemuDomainGetStatsBlock(virConnectPtr conn ATTRIBUTE_UNUSED,
+ virDomainObjPtr dom,
+ virDomainStatsRecordPtr record,
+ int *maxparams,
+ unsigned int privflags ATTRIBUTE_UNUSED)
+{
+ size_t i;
+ int ret = -1;
+ int nstats = 0;
+ qemuBlockStatsPtr stats = NULL;
+ virQEMUDriverPtr driver = conn->privateData;
+
+ if (VIR_ALLOC_N(stats, dom->def->ndisks) < 0)
+ return -1;
+
+ nstats = qemuDomainHelperGetBlockStats(driver, dom, stats,
+ dom->def->ndisks);
+ if (nstats < 0)
+ goto cleanup;
+
+ QEMU_ADD_COUNT_PARAM(record, maxparams, "block", dom->def->ndisks);
+
+ for (i = 0; i < nstats; i++) {
+ QEMU_ADD_NAME_PARAM(record, maxparams,
+ "block", i, dom->def->disks[i]->dst);
+
+ QEMU_ADD_BLOCK_PARAM_LL(record, maxparams, i,
+ "rd.reqs", stats[i].rd_req);
+ QEMU_ADD_BLOCK_PARAM_LL(record, maxparams, i,
+ "rd.bytes", stats[i].rd_bytes);
+ QEMU_ADD_BLOCK_PARAM_LL(record, maxparams, i,
+ "rd.times", stats[i].rd_total_times);
+ QEMU_ADD_BLOCK_PARAM_LL(record, maxparams, i,
+ "wr.reqs", stats[i].wr_req);
+ QEMU_ADD_BLOCK_PARAM_LL(record, maxparams, i,
+ "wr.bytes", stats[i].wr_bytes);
+ QEMU_ADD_BLOCK_PARAM_LL(record, maxparams, i,
+ "wr.times", stats[i].wr_total_times);
+ QEMU_ADD_BLOCK_PARAM_LL(record, maxparams, i,
+ "fl.reqs", stats[i].flush_req);
+ QEMU_ADD_BLOCK_PARAM_LL(record, maxparams, i,
+ "fl.times", stats[i].flush_total_times);
+ }
+
+ ret = 0;
+
+ cleanup:
+ VIR_FREE(stats);
+ return ret;
+}
+
+#undef QEMU_ADD_BLOCK_PARAM
+
#undef QEMU_ADD_NAME_PARAM
#undef QEMU_ADD_COUNT_PARAM
@@ -17643,6 +17735,7 @@ static struct qemuDomainGetStatsWorker qemuDomainGetStatsWorkers[] = {
{ qemuDomainGetStatsBalloon, VIR_DOMAIN_STATS_BALLOON, true },
{ qemuDomainGetStatsVcpu, VIR_DOMAIN_STATS_VCPU, false },
{ qemuDomainGetStatsInterface, VIR_DOMAIN_STATS_INTERFACE, false },
+ { qemuDomainGetStatsBlock, VIR_DOMAIN_STATS_BLOCK, true },
{ NULL, 0, false }
};
diff --git a/src/qemu/qemu_monitor.c b/src/qemu/qemu_monitor.c
index 702404a..d8ce875 100644
--- a/src/qemu/qemu_monitor.c
+++ b/src/qemu/qemu_monitor.c
@@ -29,6 +29,8 @@
#include <unistd.h>
#include <fcntl.h>
+#include "internal.h"
+
#include "qemu_monitor.h"
#include "qemu_monitor_text.h"
#include "qemu_monitor_json.h"
@@ -1760,6 +1762,26 @@ int qemuMonitorGetBlockStatsInfo(qemuMonitorPtr mon,
return ret;
}
+int
+qemuMonitorGetAllBlockStatsInfo(qemuMonitorPtr mon,
+ const char *dev_name,
+ qemuBlockStatsPtr stats,
+ int nstats)
+{
+ int ret;
+ VIR_DEBUG("mon=%p dev=%s", mon, dev_name);
+
+ if (mon->json) {
+ ret = qemuMonitorJSONGetAllBlockStatsInfo(mon, dev_name,
+ stats, nstats);
+ } else {
+ ret = qemuMonitorTextGetAllBlockStatsInfo(mon, dev_name,
+ stats, nstats);
+ }
+
+ return ret;
+}
+
/* Return 0 and update @nparams with the number of block stats
* QEMU supports if success. Return -1 if failure.
*/
diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
index ced198e..8e3fb44 100644
--- a/src/qemu/qemu_monitor.h
+++ b/src/qemu/qemu_monitor.h
@@ -346,6 +346,26 @@ int qemuMonitorGetBlockStatsInfo(qemuMonitorPtr mon,
long long *flush_req,
long long *flush_total_times,
long long *errs);
+
+typedef struct _qemuBlockStats qemuBlockStats;
+typedef qemuBlockStats *qemuBlockStatsPtr;
+struct _qemuBlockStats {
+ long long rd_req;
+ long long rd_bytes;
+ long long wr_req;
+ long long wr_bytes;
+ long long rd_total_times;
+ long long wr_total_times;
+ long long flush_req;
+ long long flush_total_times;
+};
+
+int qemuMonitorGetAllBlockStatsInfo(qemuMonitorPtr mon,
+ const char *dev_name,
+ qemuBlockStatsPtr stats,
+ int nstats)
+ ATTRIBUTE_NONNULL(1) ATTRIBUTE_NONNULL(3);
+
int qemuMonitorGetBlockStatsParamsNumber(qemuMonitorPtr mon,
int *nparams);
diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index 4373ba2..aa95e71 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -1734,13 +1734,9 @@ int qemuMonitorJSONGetBlockStatsInfo(qemuMonitorPtr mon,
long long *flush_total_times,
long long *errs)
{
- int ret;
- size_t i;
- bool found = false;
- virJSONValuePtr cmd = qemuMonitorJSONMakeCommand("query-blockstats",
- NULL);
- virJSONValuePtr reply = NULL;
- virJSONValuePtr devices;
+ qemuBlockStats stats;
+ int nstats = 1;
+ int ret = -1;
*rd_req = *rd_bytes = -1;
*wr_req = *wr_bytes = *errs = -1;
@@ -1754,9 +1750,51 @@ int qemuMonitorJSONGetBlockStatsInfo(qemuMonitorPtr mon,
if (flush_total_times)
*flush_total_times = -1;
+ if (qemuMonitorJSONGetAllBlockStatsInfo(mon, dev_name,
+ &stats, nstats) != nstats)
+ goto cleanup;
+
+ *rd_req = stats.rd_req;
+ *rd_bytes = stats.rd_bytes;
+ *wr_req = stats.wr_req;
+ *wr_bytes = stats.wr_bytes;
+ *errs = -1; /* QEMU does not have this */
+
+ if (rd_total_times)
+ *rd_total_times = stats.rd_total_times;
+ if (wr_total_times)
+ *wr_total_times = stats.wr_total_times;
+ if (flush_req)
+ *flush_req = stats.flush_req;
+ if (flush_total_times)
+ *flush_total_times = stats.flush_total_times;
+
+ ret = 0;
+
+ cleanup:
+ return ret;
+}
+
+
+int qemuMonitorJSONGetAllBlockStatsInfo(qemuMonitorPtr mon,
+ const char *dev_name,
+ qemuBlockStatsPtr bstats,
+ int nstats)
+{
+ int ret;
+ size_t i;
+ bool found = false;
+ virJSONValuePtr cmd = qemuMonitorJSONMakeCommand("query-blockstats",
+ NULL);
+ virJSONValuePtr reply = NULL;
+ virJSONValuePtr devices;
+
if (!cmd)
return -1;
+ if (!bstats || nstats <= 0)
+ return -1;
+
ret = qemuMonitorJSONCommand(mon, cmd, &reply);
if (ret == 0)
@@ -1772,108 +1810,125 @@ int qemuMonitorJSONGetBlockStatsInfo(qemuMonitorPtr mon,
goto cleanup;
}
+ ret = 0;
for (i = 0; i < virJSONValueArraySize(devices); i++) {
virJSONValuePtr dev = virJSONValueArrayGet(devices, i);
virJSONValuePtr stats;
- const char *thisdev;
if (!dev || dev->type != VIR_JSON_TYPE_OBJECT) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
- _("blockstats device entry was not in expected format"));
+ _("blockstats device entry was not "
+ "in expected format"));
goto cleanup;
}
- if ((thisdev = virJSONValueObjectGetString(dev, "device")) == NULL) {
- virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
- _("blockstats device entry was not in expected format"));
- goto cleanup;
+ if (ret > nstats) {
+ break;
}
- /* New QEMU has separate names for host & guest side of the disk
- * and libvirt gives the host side a 'drive-' prefix. The passed
- * in dev_name is the guest side though
+ /* If dev_name is specified, we are looking for a specific device,
+ * so we must be stricter.
*/
- if (STRPREFIX(thisdev, QEMU_DRIVE_HOST_PREFIX))
- thisdev += strlen(QEMU_DRIVE_HOST_PREFIX);
+ if (dev_name) {
+ const char *thisdev = virJSONValueObjectGetString(dev, "device");
+ if (!thisdev) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("blockstats device entry was not "
+ "in expected format"));
+ goto cleanup;
+ }
- if (STRNEQ(thisdev, dev_name))
- continue;
+ /* New QEMU has separate names for host & guest side of the disk
+ * and libvirt gives the host side a 'drive-' prefix. The passed
+ * in dev_name is the guest side though
+ */
+ if (STRPREFIX(thisdev, QEMU_DRIVE_HOST_PREFIX))
+ thisdev += strlen(QEMU_DRIVE_HOST_PREFIX);
+
+ if (STRNEQ(thisdev, dev_name))
+ continue;
+
+ found = true;
+ }
- found = true;
if ((stats = virJSONValueObjectGet(dev, "stats")) == NULL ||
stats->type != VIR_JSON_TYPE_OBJECT) {
virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
- _("blockstats stats entry was not in expected format"));
+ _("blockstats stats entry was not "
+ "in expected format"));
goto cleanup;
}
- if (virJSONValueObjectGetNumberLong(stats, "rd_bytes", rd_bytes) < 0) {
+ if (virJSONValueObjectGetNumberLong(stats, "rd_bytes",
+ &bstats->rd_bytes) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot read %s statistic"),
"rd_bytes");
goto cleanup;
}
- if (virJSONValueObjectGetNumberLong(stats, "rd_operations", rd_req) < 0) {
+ if (virJSONValueObjectGetNumberLong(stats, "rd_operations",
+ &bstats->rd_req) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot read %s statistic"),
"rd_operations");
goto cleanup;
}
- if (rd_total_times &&
- virJSONValueObjectHasKey(stats, "rd_total_time_ns") &&
+ if (virJSONValueObjectHasKey(stats, "rd_total_time_ns") &&
(virJSONValueObjectGetNumberLong(stats, "rd_total_time_ns",
- rd_total_times) < 0)) {
+ &bstats->rd_total_times) < 0)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot read %s statistic"),
"rd_total_time_ns");
goto cleanup;
}
- if (virJSONValueObjectGetNumberLong(stats, "wr_bytes", wr_bytes) < 0) {
+ if (virJSONValueObjectGetNumberLong(stats, "wr_bytes",
+ &bstats->wr_bytes) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot read %s statistic"),
"wr_bytes");
goto cleanup;
}
- if (virJSONValueObjectGetNumberLong(stats, "wr_operations", wr_req) < 0) {
+ if (virJSONValueObjectGetNumberLong(stats, "wr_operations",
+ &bstats->wr_req) < 0) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot read %s statistic"),
"wr_operations");
goto cleanup;
}
- if (wr_total_times &&
- virJSONValueObjectHasKey(stats, "wr_total_time_ns") &&
+ if (virJSONValueObjectHasKey(stats, "wr_total_time_ns") &&
(virJSONValueObjectGetNumberLong(stats, "wr_total_time_ns",
- wr_total_times) < 0)) {
+ &bstats->wr_total_times) < 0)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot read %s statistic"),
"wr_total_time_ns");
goto cleanup;
}
- if (flush_req &&
- virJSONValueObjectHasKey(stats, "flush_operations") &&
+ if (virJSONValueObjectHasKey(stats, "flush_operations") &&
(virJSONValueObjectGetNumberLong(stats, "flush_operations",
- flush_req) < 0)) {
+ &bstats->flush_req) < 0)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot read %s statistic"),
"flush_operations");
goto cleanup;
}
- if (flush_total_times &&
- virJSONValueObjectHasKey(stats, "flush_total_time_ns") &&
+ if (virJSONValueObjectHasKey(stats, "flush_total_time_ns") &&
(virJSONValueObjectGetNumberLong(stats, "flush_total_time_ns",
- flush_total_times) < 0)) {
+ &bstats->flush_total_times) < 0)) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot read %s statistic"),
"flush_total_time_ns");
goto cleanup;
}
+
+ ret++;
+ bstats++;
}
- if (!found) {
+ if (dev_name && !found) {
virReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot find statistics for device '%s'"), dev_name);
+ ret = 0;
goto cleanup;
}
- ret = 0;
cleanup:
virJSONValueFree(cmd);
diff --git a/src/qemu/qemu_monitor_json.h b/src/qemu/qemu_monitor_json.h
index a6d05b5..0744241 100644
--- a/src/qemu/qemu_monitor_json.h
+++ b/src/qemu/qemu_monitor_json.h
@@ -79,6 +79,10 @@ int qemuMonitorJSONGetBlockStatsInfo(qemuMonitorPtr mon,
long long *flush_req,
long long *flush_total_times,
long long *errs);
+int qemuMonitorJSONGetAllBlockStatsInfo(qemuMonitorPtr mon,
+ const char *dev_name,
+ qemuBlockStatsPtr stats,
+ int nstats);
int qemuMonitorJSONGetBlockStatsParamsNumber(qemuMonitorPtr mon,
int *nparams);
int qemuMonitorJSONGetBlockExtent(qemuMonitorPtr mon,
diff --git a/src/qemu/qemu_monitor_text.c b/src/qemu/qemu_monitor_text.c
index 2bc8261..5cdbef3 100644
--- a/src/qemu/qemu_monitor_text.c
+++ b/src/qemu/qemu_monitor_text.c
@@ -1048,6 +1048,19 @@ int qemuMonitorTextGetBlockExtent(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
return -1;
}
+
+int
+qemuMonitorTextGetAllBlockStatsInfo(qemuMonitorPtr mon ATTRIBUTE_UNUSED,
+ const char *dev_name ATTRIBUTE_UNUSED,
+ qemuBlockStatsPtr blockstats ATTRIBUTE_UNUSED,
+ int nstats ATTRIBUTE_UNUSED)
+{
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("unable to query all block stats with this QEMU"));
+ return -1;
+}
+
+
/* Return 0 on success, -1 on failure, or -2 if not supported. Size
* is in bytes. */
int qemuMonitorTextBlockResize(qemuMonitorPtr mon,
diff --git a/src/qemu/qemu_monitor_text.h b/src/qemu/qemu_monitor_text.h
index 49d4b88..9ebe8fb 100644
--- a/src/qemu/qemu_monitor_text.h
+++ b/src/qemu/qemu_monitor_text.h
@@ -71,6 +71,10 @@ int qemuMonitorTextGetBlockStatsInfo(qemuMonitorPtr mon,
long long *flush_req,
long long *flush_total_times,
long long *errs);
+int qemuMonitorTextGetAllBlockStatsInfo(qemuMonitorPtr mon,
+ const char *dev_name,
+ qemuBlockStatsPtr blockstats,
+ int nstats);
int qemuMonitorTextGetBlockStatsParamsNumber(qemuMonitorPtr mon,
int *nparams);
int qemuMonitorTextGetBlockExtent(qemuMonitorPtr mon,
--
1.9.3
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