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block: Compute minimum, maximum and average I/O latencies

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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>
This commit is contained in:
Alberto Garcia 2015-10-28 17:33:05 +02:00 • committed by Kevin Wolf
parent 362e9299b3
commit 979e9b03fc
6 changed files with 168 additions and 1 deletions
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31
qmp-commands.hx
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@ -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