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block: Compute minimum, maximum and average I/O latencies

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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>
This commit is contained in:
Alberto Garcia 2015-10-28 17:33:05 +02:00 • committed by Kevin Wolf
parent 362e9299b3
commit 979e9b03fc
6 changed files with 168 additions and 1 deletions
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14
include/block/accounting.h
View file

@ -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);