| 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/atomic.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_max = migration_rate_get(); |
| 28 | if (rate_limit_max == RATE_LIMIT_DISABLED) { |
| 29 | return false; |
| 30 | } |
| 31 | |
| 32 | uint64_t rate_limit_start = qatomic_read(&mig_stats.rate_limit_start); |
| 33 | uint64_t rate_limit_current = migration_transferred_bytes(); |
| 34 | uint64_t rate_limit_used = rate_limit_current - rate_limit_start; |
| 35 | |
| 36 | if (rate_limit_max > 0 && rate_limit_used > rate_limit_max) { |
| 37 | return true; |
| 38 | } |
| 39 | return false; |
| 40 | } |
| 41 | |
| 42 | uint64_t migration_rate_get(void) |
| 43 | { |
| 44 | return qatomic_read(&mig_stats.rate_limit_max); |
| 45 | } |
| 46 | |
| 47 | #define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY) |
| 48 | |
| 49 | void migration_rate_set(uint64_t limit) |
| 50 | { |
| 51 | /* |
| 52 | * 'limit' is per second. But we check it each BUFFER_DELAY milliseconds. |
| 53 | */ |
| 54 | qatomic_set(&mig_stats.rate_limit_max, limit / XFER_LIMIT_RATIO); |
| 55 | } |
| 56 | |
| 57 | void migration_rate_reset(void) |
| 58 | { |
| 59 | qatomic_set(&mig_stats.rate_limit_start, migration_transferred_bytes()); |
| 60 | } |
| 61 | |
| 62 | uint64_t migration_transferred_bytes(void) |
| 63 | { |
| 64 | uint64_t multifd = qatomic_read(&mig_stats.multifd_bytes); |
| 65 | uint64_t rdma = qatomic_read(&mig_stats.rdma_bytes); |
| 66 | uint64_t qemu_file = qatomic_read(&mig_stats.qemu_file_transferred); |
| 67 | |
| 68 | trace_migration_transferred_bytes(qemu_file, multifd, rdma); |
| 69 | return qemu_file + multifd + rdma; |
| 70 | } |