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: NAlberto Garcia <berto@igalia.com> Message-id: c7382dc89622c64f918d09f32815827772628f8e.1446044837.git.berto@igalia.com Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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