mirror of
https://github.com/qemu/qemu.git
synced 2024-12-05 09:43:44 +08:00
b741ae7417
Introduce latency histogram statics for block devices. For each accounted operation type, the latency region [0, +inf) is divided into subregions by several points. Then, calculate hits for each subregion. Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> Message-Id: <20180309165212.97144-2-vsementsov@virtuozzo.com> Reviewed-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Eric Blake <eblake@redhat.com>
122 lines
4.4 KiB
C
122 lines
4.4 KiB
C
/*
|
|
* QEMU System Emulator block accounting
|
|
*
|
|
* Copyright (c) 2011 Christoph Hellwig
|
|
* Copyright (c) 2015 Igalia, S.L.
|
|
*
|
|
* Permission is hereby granted, free of charge, to any person obtaining a copy
|
|
* of this software and associated documentation files (the "Software"), to deal
|
|
* in the Software without restriction, including without limitation the rights
|
|
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
|
|
* copies of the Software, and to permit persons to whom the Software is
|
|
* furnished to do so, subject to the following conditions:
|
|
*
|
|
* The above copyright notice and this permission notice shall be included in
|
|
* all copies or substantial portions of the Software.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
|
|
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
|
|
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
|
|
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
|
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
|
|
* THE SOFTWARE.
|
|
*/
|
|
#ifndef BLOCK_ACCOUNTING_H
|
|
#define BLOCK_ACCOUNTING_H
|
|
|
|
#include "qemu/timed-average.h"
|
|
#include "qemu/thread.h"
|
|
#include "qapi/qapi-builtin-types.h"
|
|
|
|
typedef struct BlockAcctTimedStats BlockAcctTimedStats;
|
|
typedef struct BlockAcctStats BlockAcctStats;
|
|
|
|
enum BlockAcctType {
|
|
BLOCK_ACCT_READ,
|
|
BLOCK_ACCT_WRITE,
|
|
BLOCK_ACCT_FLUSH,
|
|
BLOCK_MAX_IOTYPE,
|
|
};
|
|
|
|
struct BlockAcctTimedStats {
|
|
BlockAcctStats *stats;
|
|
TimedAverage latency[BLOCK_MAX_IOTYPE];
|
|
unsigned interval_length; /* in seconds */
|
|
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];
|
|
uint64_t nr_ops[BLOCK_MAX_IOTYPE];
|
|
uint64_t invalid_ops[BLOCK_MAX_IOTYPE];
|
|
uint64_t failed_ops[BLOCK_MAX_IOTYPE];
|
|
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;
|
|
BlockLatencyHistogram latency_histogram[BLOCK_MAX_IOTYPE];
|
|
};
|
|
|
|
typedef struct BlockAcctCookie {
|
|
int64_t bytes;
|
|
int64_t start_time_ns;
|
|
enum BlockAcctType type;
|
|
} BlockAcctCookie;
|
|
|
|
void block_acct_init(BlockAcctStats *stats);
|
|
void block_acct_setup(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);
|
|
void block_acct_failed(BlockAcctStats *stats, BlockAcctCookie *cookie);
|
|
void block_acct_invalid(BlockAcctStats *stats, enum BlockAcctType type);
|
|
void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type,
|
|
int num_requests);
|
|
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
|