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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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52
qapi/block-core.json
View file

@ -414,6 +414,52 @@
##
{ 'command': 'query-block', 'returns': ['BlockInfo'] }
##
# @BlockDeviceTimedStats:
#
# Statistics of a block device during a given interval of time.
#
# @interval_length: Interval used for calculating the statistics,
# in seconds.
#
# @min_rd_latency_ns: Minimum latency of read operations in the
# defined interval, in nanoseconds.
#
# @min_wr_latency_ns: Minimum latency of write operations in the
# defined interval, in nanoseconds.
#
# @min_flush_latency_ns: Minimum latency of flush operations in the
# defined interval, in nanoseconds.
#
# @max_rd_latency_ns: Maximum latency of read operations in the
# defined interval, in nanoseconds.
#
# @max_wr_latency_ns: Maximum latency of write operations in the
# defined interval, in nanoseconds.
#
# @max_flush_latency_ns: Maximum latency of flush operations in the
# defined interval, in nanoseconds.
#
# @avg_rd_latency_ns: Average latency of read operations in the
# defined interval, in nanoseconds.
#
# @avg_wr_latency_ns: Average latency of write operations in the
# defined interval, in nanoseconds.
#
# @avg_flush_latency_ns: Average latency of flush operations in the
# defined interval, in nanoseconds.
#
# Since: 2.5
##
{ 'struct': 'BlockDeviceTimedStats',
'data': { 'interval_length': 'int', 'min_rd_latency_ns': 'int',
'max_rd_latency_ns': 'int', 'avg_rd_latency_ns': 'int',
'min_wr_latency_ns': 'int', 'max_wr_latency_ns': 'int',
'avg_wr_latency_ns': 'int', 'min_flush_latency_ns': 'int',
'max_flush_latency_ns': 'int', 'avg_flush_latency_ns': 'int' } }
##
# @BlockDeviceStats:
#
@ -476,6 +522,9 @@
# @account_failed: Whether failed operations are included in the
# latency and last access statistics (Since 2.5)
#
# @timed_stats: Statistics specific to the set of previously defined
# intervals of time (Since 2.5)
#
# Since: 0.14.0
##
{ 'struct': 'BlockDeviceStats',
@ -487,7 +536,8 @@
'failed_rd_operations': 'int', 'failed_wr_operations': 'int',
'failed_flush_operations': 'int', 'invalid_rd_operations': 'int',
'invalid_wr_operations': 'int', 'invalid_flush_operations': 'int',
'account_invalid': 'bool', 'account_failed': 'bool' } }
'account_invalid': 'bool', 'account_failed': 'bool',
'timed_stats': ['BlockDeviceTimedStats'] } }
##
# @BlockStats: