diff options
| author | Alberto Garcia <berto@igalia.com> | 2015-10-28 17:33:05 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2015-11-12 16:22:45 +0100 |
| commit | 979e9b03fc8c85d3b78a14410c64cbb16d348095 (patch) | |
| tree | acadf4f7a6bf98a4ce5363ea40a5658542949640 /qmp-commands.hx | |
| parent | 362e9299b34b3101aaa20f20363441c9f055fa5e (diff) | |
block: Compute minimum, maximum and average I/O latencies
This patch keeps track of the minimum, maximum and average latencies
of I/O operations during a certain interval of time.
The values are exposed in the BlockDeviceTimedStats structure.
An option to define the intervals to collect these statistics will be
added in a separate patch.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-id: c7382dc89622c64f918d09f32815827772628f8e.1446044837.git.berto@igalia.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'qmp-commands.hx')
| -rw-r--r-- | qmp-commands.hx | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/qmp-commands.hx b/qmp-commands.hx index b0710a2d04..3e50f7fbb1 100644 --- a/qmp-commands.hx +++ b/qmp-commands.hx @@ -2604,6 +2604,37 @@ Each json-object contain the following: - "account_failed": whether failed operations are included in the latency and last access statistics (json-bool) + - "timed_stats": A json-array containing statistics collected in + specific intervals, with the following members: + - "interval_length": interval used for calculating the + statistics, in seconds (json-int) + - "min_rd_latency_ns": minimum latency of read operations in + the defined interval, in nanoseconds + (json-int) + - "min_wr_latency_ns": minimum latency of write operations in + the defined interval, in nanoseconds + (json-int) + - "min_flush_latency_ns": minimum latency of flush operations + in the defined interval, in + nanoseconds (json-int) + - "max_rd_latency_ns": maximum latency of read operations in + the defined interval, in nanoseconds + (json-int) + - "max_wr_latency_ns": maximum latency of write operations in + the defined interval, in nanoseconds + (json-int) + - "max_flush_latency_ns": maximum latency of flush operations + in the defined interval, in + nanoseconds (json-int) + - "avg_rd_latency_ns": average latency of read operations in + the defined interval, in nanoseconds + (json-int) + - "avg_wr_latency_ns": average latency of write operations in + the defined interval, in nanoseconds + (json-int) + - "avg_flush_latency_ns": average latency of flush operations + in the defined interval, in + nanoseconds (json-int) - "parent": Contains recursively the statistics of the underlying protocol (e.g. the host file for a qcow2 image). If there is no underlying protocol, this field is omitted |