migration/migration-stats.c

   1 /*
   2  * Migration stats
   3  *
   4  * Copyright (c) 2012-2023 Red Hat Inc
   5  *
   6  * Authors:
   7  *  Juan Quintela <quintela@redhat.com>
   8  *
   9  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  10  * See the COPYING file in the top-level directory.
  11  */
  12
  13 #include "qemu/osdep.h"
  14 #include "qemu/stats64.h"
  15 #include "qemu-file.h"
  16 #include "trace.h"
  17 #include "migration-stats.h"
  18
  19 MigrationAtomicStats mig_stats;
  20
  21 bool migration_rate_exceeded(QEMUFile *f)
  22 {
  23     if (qemu_file_get_error(f)) {
  24         return true;
  25     }
  26
  27     uint64_t rate_limit_start = stat64_get(&mig_stats.rate_limit_start);
  28     uint64_t rate_limit_current = migration_transferred_bytes(f);
  29     uint64_t rate_limit_used = rate_limit_current - rate_limit_start;
  30     uint64_t rate_limit_max = stat64_get(&mig_stats.rate_limit_max);
  31
  32     if (rate_limit_max == RATE_LIMIT_DISABLED) {
  33         return false;
  34     }
  35     if (rate_limit_max > 0 && rate_limit_used > rate_limit_max) {
  36         return true;
  37     }
  38     return false;
  39 }
  40
  41 uint64_t migration_rate_get(void)
  42 {
  43     return stat64_get(&mig_stats.rate_limit_max);
  44 }
  45
  46 #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
  47
  48 void migration_rate_set(uint64_t limit)
  49 {
  50     /*
  51      * 'limit' is per second.  But we check it each BUFFER_DELAY milliseconds.
  52      */
  53     stat64_set(&mig_stats.rate_limit_max, limit / XFER_LIMIT_RATIO);
  54 }
  55
  56 void migration_rate_reset(QEMUFile *f)
  57 {
  58     stat64_set(&mig_stats.rate_limit_start, migration_transferred_bytes(f));
  59 }
  60
  61 uint64_t migration_transferred_bytes(QEMUFile *f)
  62 {
  63     uint64_t multifd = stat64_get(&mig_stats.multifd_bytes);
  64     uint64_t qemu_file = qemu_file_transferred(f);
  65
  66     trace_migration_transferred_bytes(qemu_file, multifd);
  67     return qemu_file + multifd;
  68 }