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block: Add idle_time_ns to BlockDeviceStats

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This patch adds the new field 'idle_time_ns' to the BlockDeviceStats
structure, indicating the time that has passed since the previous I/O
operation.

It also adds the block_acct_idle_time_ns() call, to ensure that all
references to the clock type used for accounting are in the same
place. This will later allow us to use a different clock for iotests.

Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-id: 7d8cfcf931453e1a2443e6626e8c1edc347c7c8a.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 17:33:02 +02:00 • committed by Kevin Wolf
parent bd797fc15b
commit cb38fffbc9
6 changed files with 33 additions and 6 deletions
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10
qmp-commands.hx
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@ -2583,6 +2583,10 @@ Each json-object contain the following:
another request (json-int)
- "wr_merged": number of write requests that have been merged into
another request (json-int)
- "idle_time_ns": time since the last I/O operation, in
nanoseconds. If the field is absent it means
that there haven't been any operations yet
(json-int, optional)
- "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
@ -2607,7 +2611,8 @@ Example:
"flush_total_times_ns":49653
"flush_operations":61,
"rd_merged":0,
"wr_merged":0
"wr_merged":0,
"idle_time_ns":2953431879
}
},
"stats":{
@ -2621,7 +2626,8 @@ Example:
"rd_total_times_ns":3465673657
"flush_total_times_ns":49653,
"rd_merged":0,
"wr_merged":0
"wr_merged":0,
"idle_time_ns":2953431879
}
},
{