From 96e4dedaff9922f87e4ec351d51d3f093198382a Mon Sep 17 00:00:00 2001 From: Alberto Garcia Date: Wed, 28 Oct 2015 17:33:06 +0200 Subject: 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 Message-id: fd31fef53e2714f2f30d59ed58ca2f67ec9ab926.1446044837.git.berto@igalia.com Signed-off-by: Stefan Hajnoczi Signed-off-by: Kevin Wolf --- block/accounting.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) (limited to 'block/accounting.c') 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; +} -- cgit v1.2.3