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/*
* Dirty page rate limit implementation code
*
* Copyright (c) 2022 CHINA TELECOM CO.,LTD.
*
* Authors:
* Hyman Huang(黄勇) <huangy81@chinatelecom.cn>
*
* 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 "qapi/error.h"
#include "qemu/main-loop.h"
#include "qapi/qapi-commands-migration.h"
#include "sysemu/dirtyrate.h"
#include "sysemu/dirtylimit.h"
#include "exec/memory.h"
#include "hw/boards.h"
struct {
VcpuStat stat;
bool running;
QemuThread thread;
} *vcpu_dirty_rate_stat;
static void vcpu_dirty_rate_stat_collect(void)
{
VcpuStat stat;
int i = 0;
/* calculate vcpu dirtyrate */
vcpu_calculate_dirtyrate(DIRTYLIMIT_CALC_TIME_MS,
&stat,
GLOBAL_DIRTY_LIMIT,
false);
for (i = 0; i < stat.nvcpu; i++) {
vcpu_dirty_rate_stat->stat.rates[i].id = i;
vcpu_dirty_rate_stat->stat.rates[i].dirty_rate =
stat.rates[i].dirty_rate;
}
free(stat.rates);
}
static void *vcpu_dirty_rate_stat_thread(void *opaque)
{
rcu_register_thread();
/* start log sync */
global_dirty_log_change(GLOBAL_DIRTY_LIMIT, true);
while (qatomic_read(&vcpu_dirty_rate_stat->running)) {
vcpu_dirty_rate_stat_collect();
}
/* stop log sync */
global_dirty_log_change(GLOBAL_DIRTY_LIMIT, false);
rcu_unregister_thread();
return NULL;
}
int64_t vcpu_dirty_rate_get(int cpu_index)
{
DirtyRateVcpu *rates = vcpu_dirty_rate_stat->stat.rates;
return qatomic_read_i64(&rates[cpu_index].dirty_rate);
}
void vcpu_dirty_rate_stat_start(void)
{
if (qatomic_read(&vcpu_dirty_rate_stat->running)) {
return;
}
qatomic_set(&vcpu_dirty_rate_stat->running, 1);
qemu_thread_create(&vcpu_dirty_rate_stat->thread,
"dirtyrate-stat",
vcpu_dirty_rate_stat_thread,
NULL,
QEMU_THREAD_JOINABLE);
}
void vcpu_dirty_rate_stat_stop(void)
{
qatomic_set(&vcpu_dirty_rate_stat->running, 0);
qemu_mutex_unlock_iothread();
qemu_thread_join(&vcpu_dirty_rate_stat->thread);
qemu_mutex_lock_iothread();
}
void vcpu_dirty_rate_stat_initialize(void)
{
MachineState *ms = MACHINE(qdev_get_machine());
int max_cpus = ms->smp.max_cpus;
vcpu_dirty_rate_stat =
g_malloc0(sizeof(*vcpu_dirty_rate_stat));
vcpu_dirty_rate_stat->stat.nvcpu = max_cpus;
vcpu_dirty_rate_stat->stat.rates =
g_malloc0(sizeof(DirtyRateVcpu) * max_cpus);
vcpu_dirty_rate_stat->running = false;
}
void vcpu_dirty_rate_stat_finalize(void)
{
free(vcpu_dirty_rate_stat->stat.rates);
vcpu_dirty_rate_stat->stat.rates = NULL;
free(vcpu_dirty_rate_stat);
vcpu_dirty_rate_stat = NULL;
}
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