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 } 69