diff options
| author | Alberto Garcia <berto@igalia.com> | 2015-10-28 17:33:05 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2015-11-12 16:22:45 +0100 |
| commit | 979e9b03fc8c85d3b78a14410c64cbb16d348095 (patch) | |
| tree | acadf4f7a6bf98a4ce5363ea40a5658542949640 /include | |
| parent | 362e9299b34b3101aaa20f20363441c9f055fa5e (diff) | |
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: 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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/block/accounting.h | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/include/block/accounting.h b/include/block/accounting.h index 0d9b076955..1dd582a99a 100644 --- a/include/block/accounting.h +++ b/include/block/accounting.h @@ -28,6 +28,9 @@ #include <stdbool.h> #include "qemu/typedefs.h" +#include "qemu/timed-average.h" + +typedef struct BlockAcctTimedStats BlockAcctTimedStats; enum BlockAcctType { BLOCK_ACCT_READ, @@ -36,6 +39,12 @@ enum BlockAcctType { BLOCK_MAX_IOTYPE, }; +struct BlockAcctTimedStats { + TimedAverage latency[BLOCK_MAX_IOTYPE]; + unsigned interval_length; /* in seconds */ + QSLIST_ENTRY(BlockAcctTimedStats) entries; +}; + typedef struct BlockAcctStats { uint64_t nr_bytes[BLOCK_MAX_IOTYPE]; uint64_t nr_ops[BLOCK_MAX_IOTYPE]; @@ -44,6 +53,7 @@ typedef struct BlockAcctStats { uint64_t total_time_ns[BLOCK_MAX_IOTYPE]; uint64_t merged[BLOCK_MAX_IOTYPE]; int64_t last_access_time_ns; + QSLIST_HEAD(, BlockAcctTimedStats) intervals; bool account_invalid; bool account_failed; } BlockAcctStats; @@ -56,6 +66,10 @@ typedef struct BlockAcctCookie { void block_acct_init(BlockAcctStats *stats, bool account_invalid, bool account_failed); +void block_acct_cleanup(BlockAcctStats *stats); +void block_acct_add_interval(BlockAcctStats *stats, unsigned interval_length); +BlockAcctTimedStats *block_acct_interval_next(BlockAcctStats *stats, + BlockAcctTimedStats *s); void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie, int64_t bytes, enum BlockAcctType type); void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie); |