diff options
| author | Christoph Hellwig <hch@lst.de> | 2011-08-25 08:26:10 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2011-08-26 18:18:38 +0200 |
| commit | c488c7f649106d09df76f697adccbe6e72520b26 (patch) | |
| tree | 7933f6f000b5ea1e5cc4bf528106f85575885723 /block.c | |
| parent | a597e79ce14ea62266924acc7b8a7030a42ed29b (diff) | |
block: latency accounting
Account the total latency for read/write/flush requests. This allows
management tools to average it based on a snapshot of the nr ops
counters and allow checking for SLAs or provide statistics.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'block.c')
| -rw-r--r-- | block.c | 20 |
1 files changed, 17 insertions, 3 deletions
@@ -1916,12 +1916,18 @@ static void bdrv_stats_iter(QObject *data, void *opaque) " rd_operations=%" PRId64 " wr_operations=%" PRId64 " flush_operations=%" PRId64 + " wr_total_time_ns=%" PRId64 + " rd_total_time_ns=%" PRId64 + " flush_total_time_ns=%" PRId64 "\n", qdict_get_int(qdict, "rd_bytes"), qdict_get_int(qdict, "wr_bytes"), qdict_get_int(qdict, "rd_operations"), qdict_get_int(qdict, "wr_operations"), - qdict_get_int(qdict, "flush_operations")); + qdict_get_int(qdict, "flush_operations"), + qdict_get_int(qdict, "wr_total_time_ns"), + qdict_get_int(qdict, "rd_total_time_ns"), + qdict_get_int(qdict, "flush_total_time_ns")); } void bdrv_stats_print(Monitor *mon, const QObject *data) @@ -1940,7 +1946,10 @@ static QObject* bdrv_info_stats_bs(BlockDriverState *bs) "'rd_operations': %" PRId64 "," "'wr_operations': %" PRId64 "," "'wr_highest_offset': %" PRId64 "," - "'flush_operations': %" PRId64 + "'flush_operations': %" PRId64 "," + "'wr_total_time_ns': %" PRId64 "," + "'rd_total_time_ns': %" PRId64 "," + "'flush_total_time_ns': %" PRId64 "} }", bs->nr_bytes[BDRV_ACCT_READ], bs->nr_bytes[BDRV_ACCT_WRITE], @@ -1948,7 +1957,10 @@ static QObject* bdrv_info_stats_bs(BlockDriverState *bs) bs->nr_ops[BDRV_ACCT_WRITE], bs->wr_highest_sector * (uint64_t)BDRV_SECTOR_SIZE, - bs->nr_ops[BDRV_ACCT_FLUSH]); + bs->nr_ops[BDRV_ACCT_FLUSH], + bs->total_time_ns[BDRV_ACCT_WRITE], + bs->total_time_ns[BDRV_ACCT_READ], + bs->total_time_ns[BDRV_ACCT_FLUSH]); dict = qobject_to_qdict(res); if (*bs->device_name) { @@ -3160,6 +3172,7 @@ bdrv_acct_start(BlockDriverState *bs, BlockAcctCookie *cookie, int64_t bytes, assert(type < BDRV_MAX_IOTYPE); cookie->bytes = bytes; + cookie->start_time_ns = get_clock(); cookie->type = type; } @@ -3170,6 +3183,7 @@ bdrv_acct_done(BlockDriverState *bs, BlockAcctCookie *cookie) bs->nr_bytes[cookie->type] += cookie->bytes; bs->nr_ops[cookie->type]++; + bs->total_time_ns[cookie->type] += get_clock() - cookie->start_time_ns; } int bdrv_img_create(const char *filename, const char *fmt, |