qemu

FORK: QEMU emulator
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accounting.h (4623B)

      1 /*
      2  * QEMU System Emulator block accounting
      3  *
      4  * Copyright (c) 2011 Christoph Hellwig
      5  * Copyright (c) 2015 Igalia, S.L.
      6  *
      7  * Permission is hereby granted, free of charge, to any person obtaining a copy
      8  * of this software and associated documentation files (the "Software"), to deal
      9  * in the Software without restriction, including without limitation the rights
     10  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
     11  * copies of the Software, and to permit persons to whom the Software is
     12  * furnished to do so, subject to the following conditions:
     13  *
     14  * The above copyright notice and this permission notice shall be included in
     15  * all copies or substantial portions of the Software.
     16  *
     17  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
     18  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
     19  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
     20  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
     21  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
     22  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
     23  * THE SOFTWARE.
     24  */
     25 #ifndef BLOCK_ACCOUNTING_H
     26 #define BLOCK_ACCOUNTING_H
     27 
     28 #include "qemu/timed-average.h"
     29 #include "qemu/thread.h"
     30 #include "qapi/qapi-types-common.h"
     31 
     32 typedef struct BlockAcctTimedStats BlockAcctTimedStats;
     33 typedef struct BlockAcctStats BlockAcctStats;
     34 
     35 enum BlockAcctType {
     36     BLOCK_ACCT_NONE = 0,
     37     BLOCK_ACCT_READ,
     38     BLOCK_ACCT_WRITE,
     39     BLOCK_ACCT_FLUSH,
     40     BLOCK_ACCT_UNMAP,
     41     BLOCK_MAX_IOTYPE,
     42 };
     43 
     44 struct BlockAcctTimedStats {
     45     BlockAcctStats *stats;
     46     TimedAverage latency[BLOCK_MAX_IOTYPE];
     47     unsigned interval_length; /* in seconds */
     48     QSLIST_ENTRY(BlockAcctTimedStats) entries;
     49 };
     50 
     51 typedef struct BlockLatencyHistogram {
     52     /* The following histogram is represented like this:
     53      *
     54      * 5|           *
     55      * 4|           *
     56      * 3| *         *
     57      * 2| *         *    *
     58      * 1| *    *    *    *
     59      *  +------------------
     60      *      10   50   100
     61      *
     62      * BlockLatencyHistogram histogram = {
     63      *     .nbins = 4,
     64      *     .boundaries = {10, 50, 100},
     65      *     .bins = {3, 1, 5, 2},
     66      * };
     67      *
     68      * @boundaries array define histogram intervals as follows:
     69      * [0, boundaries[0]), [boundaries[0], boundaries[1]), ...
     70      * [boundaries[nbins-2], +inf)
     71      *
     72      * So, for example above, histogram intervals are:
     73      * [0, 10), [10, 50), [50, 100), [100, +inf)
     74      */
     75     int nbins;
     76     uint64_t *boundaries; /* @nbins-1 numbers here
     77                              (all boundaries, except 0 and +inf) */
     78     uint64_t *bins;
     79 } BlockLatencyHistogram;
     80 
     81 struct BlockAcctStats {
     82     QemuMutex lock;
     83     uint64_t nr_bytes[BLOCK_MAX_IOTYPE];
     84     uint64_t nr_ops[BLOCK_MAX_IOTYPE];
     85     uint64_t invalid_ops[BLOCK_MAX_IOTYPE];
     86     uint64_t failed_ops[BLOCK_MAX_IOTYPE];
     87     uint64_t total_time_ns[BLOCK_MAX_IOTYPE];
     88     uint64_t merged[BLOCK_MAX_IOTYPE];
     89     int64_t last_access_time_ns;
     90     QSLIST_HEAD(, BlockAcctTimedStats) intervals;
     91     bool account_invalid;
     92     bool account_failed;
     93     BlockLatencyHistogram latency_histogram[BLOCK_MAX_IOTYPE];
     94 };
     95 
     96 typedef struct BlockAcctCookie {
     97     int64_t bytes;
     98     int64_t start_time_ns;
     99     enum BlockAcctType type;
    100 } BlockAcctCookie;
    101 
    102 void block_acct_init(BlockAcctStats *stats);
    103 void block_acct_setup(BlockAcctStats *stats, enum OnOffAuto account_invalid,
    104                       enum OnOffAuto account_failed);
    105 void block_acct_cleanup(BlockAcctStats *stats);
    106 void block_acct_add_interval(BlockAcctStats *stats, unsigned interval_length);
    107 BlockAcctTimedStats *block_acct_interval_next(BlockAcctStats *stats,
    108                                               BlockAcctTimedStats *s);
    109 void block_acct_start(BlockAcctStats *stats, BlockAcctCookie *cookie,
    110                       int64_t bytes, enum BlockAcctType type);
    111 void block_acct_done(BlockAcctStats *stats, BlockAcctCookie *cookie);
    112 void block_acct_failed(BlockAcctStats *stats, BlockAcctCookie *cookie);
    113 void block_acct_invalid(BlockAcctStats *stats, enum BlockAcctType type);
    114 void block_acct_merge_done(BlockAcctStats *stats, enum BlockAcctType type,
    115                            int num_requests);
    116 int64_t block_acct_idle_time_ns(BlockAcctStats *stats);
    117 double block_acct_queue_depth(BlockAcctTimedStats *stats,
    118                               enum BlockAcctType type);
    119 int block_latency_histogram_set(BlockAcctStats *stats, enum BlockAcctType type,
    120                                 uint64List *boundaries);
    121 void block_latency_histograms_clear(BlockAcctStats *stats);
    122 
    123 #endif