diff options
| author | Alberto Garcia <berto@igalia.com> | 2015-10-28 17:33:06 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2015-11-12 16:22:46 +0100 |
| commit | 96e4dedaff9922f87e4ec351d51d3f093198382a (patch) | |
| tree | 4f13bd41dbde11ddedeb6ce30d0ae0ca11e8ea6e /block/accounting.c | |
| parent | 979e9b03fc8c85d3b78a14410c64cbb16d348095 (diff) | |
| download | qemu-96e4dedaff9922f87e4ec351d51d3f093198382a.tar.gz | |
block: Add average I/O queue depth to BlockDeviceTimedStats
This patch adds two new fields to BlockDeviceTimedStats that track the
average number of pending read and write requests for a block device.
The values are calculated for the period of time defined for that
interval.
Signed-off-by: Alberto Garcia <berto@igalia.com>
Message-id: fd31fef53e2714f2f30d59ed58ca2f67ec9ab926.1446044837.git.berto@igalia.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block/accounting.c')
| -rw-r--r-- | block/accounting.c | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/block/accounting.c b/block/accounting.c index 61de8ce9bc..a9419315a3 100644 --- a/block/accounting.c +++ b/block/accounting.c @@ -143,3 +143,15 @@ int64_t block_acct_idle_time_ns(BlockAcctStats *stats) { return qemu_clock_get_ns(clock_type) - stats->last_access_time_ns; } + +double block_acct_queue_depth(BlockAcctTimedStats *stats, + enum BlockAcctType type) +{ + uint64_t sum, elapsed; + + assert(type < BLOCK_MAX_IOTYPE); + + sum = timed_average_sum(&stats->latency[type], &elapsed); + + return (double) sum / elapsed; +} |