diff options
Diffstat (limited to 'include/block/accounting.h')
| -rw-r--r-- | include/block/accounting.h | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/include/block/accounting.h b/include/block/accounting.h index b833d26..d1f67b1 100644 --- a/include/block/accounting.h +++ b/include/block/accounting.h @@ -27,6 +27,7 @@ #include "qemu/timed-average.h" #include "qemu/thread.h" +#include "qapi/qapi-builtin-types.h" typedef struct BlockAcctTimedStats BlockAcctTimedStats; typedef struct BlockAcctStats BlockAcctStats; @@ -45,6 +46,36 @@ struct BlockAcctTimedStats { QSLIST_ENTRY(BlockAcctTimedStats) entries; }; +typedef struct BlockLatencyHistogram { + /* The following histogram is represented like this: + * + * 5| * + * 4| * + * 3| * * + * 2| * * * + * 1| * * * * + * +------------------ + * 10 50 100 + * + * BlockLatencyHistogram histogram = { + * .nbins = 4, + * .boundaries = {10, 50, 100}, + * .bins = {3, 1, 5, 2}, + * }; + * + * @boundaries array define histogram intervals as follows: + * [0, boundaries[0]), [boundaries[0], boundaries[1]), ... + * [boundaries[nbins-2], +inf) + * + * So, for example above, histogram intervals are: + * [0, 10), [10, 50), [50, 100), [100, +inf) + */ + int nbins; + uint64_t *boundaries; /* @nbins-1 numbers here + (all boundaries, except 0 and +inf) */ + uint64_t *bins; +} BlockLatencyHistogram; + struct BlockAcctStats { QemuMutex lock; uint64_t nr_bytes[BLOCK_MAX_IOTYPE]; @@ -57,6 +88,7 @@ struct BlockAcctStats { QSLIST_HEAD(, BlockAcctTimedStats) intervals; bool account_invalid; bool account_failed; + BlockLatencyHistogram latency_histogram[BLOCK_MAX_IOTYPE]; }; typedef struct BlockAcctCookie { @@ -82,5 +114,8 @@ void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type, int64_t block_acct_idle_time_ns(BlockAcctStats *stats); double block_acct_queue_depth(BlockAcctTimedStats *stats, enum BlockAcctType type); +int block_latency_histogram_set(BlockAcctStats *stats, enum BlockAcctType type, + uint64List *boundaries); +void block_latency_histograms_clear(BlockAcctStats *stats); #endif |