Expose threshold information by collecting the information from
QMP commands. qemu has a way to get threshold information on all
elements of a block chain, but only if libvirt provides node names
for each node, and then correlates 'query-named-block-nodes' back
to the names on each chain element. So for now, we only worry
about the threshold of the active layer of a chain.
* src/qemu/qemu_monitor.h (_qemuBlockStats): Add member.
* src/qemu/qemu_monitor_json.c
(qemuMonitorJSONBlockStatsUpdateCapacity): Populate it.
* src/qemu/qemu_driver.c (qemuDomainGetStatsOneBlock): Expose it.
* tests/qemumonitortest.c (testBlockInfoData): Deal with new
member.
Signed-off-by: Eric Blake <eblake@xxxxxxxxxx>
---
src/qemu/qemu_driver.c | 6 ++++++
src/qemu/qemu_monitor.h | 1 +
src/qemu/qemu_monitor_json.c | 16 ++++++++++++++++
tests/qemumonitortest.c | 13 +++++++------
4 files changed, 30 insertions(+), 6 deletions(-)
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 6bb8549..74a6680 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -19370,6 +19370,12 @@ qemuDomainGetStatsOneBlock(virQEMUDriverPtr driver,
QEMU_ADD_BLOCK_PARAM_LL(record, maxparams, block_idx,
"fl.times", entry->flush_total_times);
+ /* TODO: Until we can set thresholds on backing elements, we only
+ * report the threshold on the active layer. */
+ if (!backing_idx)
+ QEMU_ADD_BLOCK_PARAM_ULL(record, maxparams, block_idx,
+ "write-threshold", entry->write_threshold);
+
QEMU_ADD_BLOCK_PARAM_ULL(record, maxparams, block_idx,
"allocation", entry->wr_highest_offset);
diff --git a/src/qemu/qemu_monitor.h b/src/qemu/qemu_monitor.h
index 381c0a6..45afba4 100644
--- a/src/qemu/qemu_monitor.h
+++ b/src/qemu/qemu_monitor.h
@@ -384,6 +384,7 @@ struct _qemuBlockStats {
unsigned long long capacity;
unsigned long long physical;
unsigned long long wr_highest_offset;
+ unsigned long long write_threshold;
};
int qemuMonitorGetAllBlockStatsInfo(qemuMonitorPtr mon,
diff --git a/src/qemu/qemu_monitor_json.c b/src/qemu/qemu_monitor_json.c
index 8dd1279..2cb3c4b 100644
--- a/src/qemu/qemu_monitor_json.c
+++ b/src/qemu/qemu_monitor_json.c
@@ -1942,6 +1942,7 @@ qemuMonitorJSONBlockStatsUpdateCapacity(qemuMonitorPtr mon,
virJSONValuePtr dev = virJSONValueArrayGet(devices, i);
virJSONValuePtr inserted;
virJSONValuePtr image;
+ virJSONValuePtr threshold;
const char *dev_name;
if (!dev || dev->type != VIR_JSON_TYPE_OBJECT) {
@@ -1967,6 +1968,21 @@ qemuMonitorJSONBlockStatsUpdateCapacity(qemuMonitorPtr mon,
stats,
backingChain) < 0)
goto cleanup;
+
+ /* For the top layer only, additionally populate the
+ * write_threshold stat. TODO: populating it for other layers
+ * requires naming all nodes, and correlating
+ * query-named-block-nodes back to the data learned here. */
+ if ((threshold = virJSONValueObjectGet(inserted, "write_threshold"))) {
+ char *entry_name = qemuDomainStorageAlias(dev_name, 0);
+ qemuBlockStatsPtr bstats = virHashLookup(stats, entry_name);
+ VIR_FREE(entry_name);
+
+ if (bstats &&
+ virJSONValueGetNumberUlong(threshold,
+ &bstats->write_threshold) < 0)
+ goto cleanup;
+ }
}
ret = 0;
diff --git a/tests/qemumonitortest.c b/tests/qemumonitortest.c
index 0125962..6dfb7ad 100644
--- a/tests/qemumonitortest.c
+++ b/tests/qemumonitortest.c
@@ -93,12 +93,13 @@ struct blockInfoData {
static const struct blockInfoData testBlockInfoData[] =
{
-/* NAME, rd_req, rd_bytes, wr_req, wr_bytes, rd_total_time, wr_total_time, flush_req, flush_total_time */
- {"vda", {11, 12, 13, 14, 15, 16, 17, 18, 0, 0, 0}},
- {"vdb", {21, 22, 23, 24, 25, 26, 27, 28, 0, 0, 0}},
- {"vdc", {31, 32, 33, -1, 35, 36, 37, 38, 0, 0, 0}},
- {"vdd", {-1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0}},
- {"vde", {41, 42, 43, 44, 45, 46, 47, 48, 0, 0, 0}}
+ /* NAME, rd_req, rd_bytes, wr_req, wr_bytes, rd_total_time, wr_total_time,
+ flush_req, flush_total_time, write_threshold */
+ {"vda", {11, 12, 13, 14, 15, 16, 17, 18, 0, 0, 0, 0}},
+ {"vdb", {21, 22, 23, 24, 25, 26, 27, 28, 0, 0, 0, 0}},
+ {"vdc", {31, 32, 33, -1, 35, 36, 37, 38, 0, 0, 0, 0}},
+ {"vdd", {-1, -1, -1, -1, -1, -1, -1, -1, 0, 0, 0, 0}},
+ {"vde", {41, 42, 43, 44, 45, 46, 47, 48, 0, 0, 0, 0}}
};
static const char testBlockInfoReply[] =
--
2.4.2
--
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