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/*
* Migration stats
*
* Copyright (c) 2012-2023 Red Hat Inc
*
* Authors:
* Juan Quintela <quintela@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qemu/stats64.h"
#include "qemu-file.h"
#include "trace.h"
#include "migration-stats.h"
MigrationAtomicStats mig_stats;
bool migration_rate_exceeded(QEMUFile *f)
{
if (qemu_file_get_error(f)) {
return true;
}
uint64_t rate_limit_start = stat64_get(&mig_stats.rate_limit_start);
uint64_t rate_limit_current = migration_transferred_bytes(f);
uint64_t rate_limit_used = rate_limit_current - rate_limit_start;
uint64_t rate_limit_max = stat64_get(&mig_stats.rate_limit_max);
if (rate_limit_max == RATE_LIMIT_DISABLED) {
return false;
}
if (rate_limit_max > 0 && rate_limit_used > rate_limit_max) {
return true;
}
return false;
}
uint64_t migration_rate_get(void)
{
return stat64_get(&mig_stats.rate_limit_max);
}
#define XFER_LIMIT_RATIO (1000 / BUFFER_DELAY)
void migration_rate_set(uint64_t limit)
{
/*
* 'limit' is per second. But we check it each BUFFER_DELAY milliseconds.
*/
stat64_set(&mig_stats.rate_limit_max, limit / XFER_LIMIT_RATIO);
}
void migration_rate_reset(QEMUFile *f)
{
stat64_set(&mig_stats.rate_limit_start, migration_transferred_bytes(f));
}
uint64_t migration_transferred_bytes(QEMUFile *f)
{
uint64_t multifd = stat64_get(&mig_stats.multifd_bytes);
uint64_t qemu_file = qemu_file_transferred(f);
trace_migration_transferred_bytes(qemu_file, multifd);
return qemu_file + multifd;
}
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