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authorAlberto Garcia <berto@igalia.com>2015-10-28 17:33:05 +0200
committerKevin Wolf <kwolf@redhat.com>2015-11-12 16:22:45 +0100
commit979e9b03fc8c85d3b78a14410c64cbb16d348095 (patch)
treeacadf4f7a6bf98a4ce5363ea40a5658542949640 /include/block
parent362e9299b34b3101aaa20f20363441c9f055fa5e (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/block')
-rw-r--r--include/block/accounting.h14
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);