#include "qemu/seqlock.h"
#include "qapi-event.h"
#include "hw/nmi.h"
+#include "sysemu/replay.h"
#ifndef _WIN32
#include "qemu/compatfd.h"
int64_t max_delay;
int64_t max_advance;
+/* vcpu throttling controls */
+static QEMUTimer *throttle_timer;
+static unsigned int throttle_percentage;
+
+#define CPU_THROTTLE_PCT_MIN 1
+#define CPU_THROTTLE_PCT_MAX 99
+#define CPU_THROTTLE_TIMESLICE_NS 10000000
+
bool cpu_is_stopped(CPUState *cpu)
{
return cpu->stopped || !runstate_is_running();
ticks = timers_state.cpu_ticks_offset;
if (timers_state.cpu_ticks_enabled) {
- ticks += cpu_get_real_ticks();
+ ticks += cpu_get_host_ticks();
}
if (timers_state.cpu_ticks_prev > ticks) {
/* Here, the really thing protected by seqlock is cpu_clock_offset. */
seqlock_write_lock(&timers_state.vm_clock_seqlock);
if (!timers_state.cpu_ticks_enabled) {
- timers_state.cpu_ticks_offset -= cpu_get_real_ticks();
+ timers_state.cpu_ticks_offset -= cpu_get_host_ticks();
timers_state.cpu_clock_offset -= get_clock();
timers_state.cpu_ticks_enabled = 1;
}
/* Here, the really thing protected by seqlock is cpu_clock_offset. */
seqlock_write_lock(&timers_state.vm_clock_seqlock);
if (timers_state.cpu_ticks_enabled) {
- timers_state.cpu_ticks_offset += cpu_get_real_ticks();
+ timers_state.cpu_ticks_offset += cpu_get_host_ticks();
timers_state.cpu_clock_offset = cpu_get_clock_locked();
timers_state.cpu_ticks_enabled = 0;
}
return (count + (1 << icount_time_shift) - 1) >> icount_time_shift;
}
-static void icount_warp_rt(void *opaque)
+static void icount_warp_rt(void)
{
/* The icount_warp_timer is rescheduled soon after vm_clock_warp_start
* changes from -1 to another value, so the race here is okay.
seqlock_write_lock(&timers_state.vm_clock_seqlock);
if (runstate_is_running()) {
- int64_t clock = cpu_get_clock_locked();
+ int64_t clock = REPLAY_CLOCK(REPLAY_CLOCK_VIRTUAL_RT,
+ cpu_get_clock_locked());
int64_t warp_delta;
warp_delta = clock - vm_clock_warp_start;
}
}
+static void icount_dummy_timer(void *opaque)
+{
+ (void)opaque;
+}
+
void qtest_clock_warp(int64_t dest)
{
int64_t clock = qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL);
return;
}
+ /* Nothing to do if the VM is stopped: QEMU_CLOCK_VIRTUAL timers
+ * do not fire, so computing the deadline does not make sense.
+ */
+ if (!runstate_is_running()) {
+ return;
+ }
+
+ /* warp clock deterministically in record/replay mode */
+ if (!replay_checkpoint(CHECKPOINT_CLOCK_WARP)) {
+ return;
+ }
+
if (icount_sleep) {
/*
* If the CPUs have been sleeping, advance QEMU_CLOCK_VIRTUAL timer now.
* the CPU starts running, in case the CPU is woken by an event other
* than the earliest QEMU_CLOCK_VIRTUAL timer.
*/
- icount_warp_rt(NULL);
+ icount_warp_rt();
timer_del(icount_warp_timer);
}
if (!all_cpu_threads_idle()) {
}
};
+static void cpu_throttle_thread(void *opaque)
+{
+ CPUState *cpu = opaque;
+ double pct;
+ double throttle_ratio;
+ long sleeptime_ns;
+
+ if (!cpu_throttle_get_percentage()) {
+ return;
+ }
+
+ pct = (double)cpu_throttle_get_percentage()/100;
+ throttle_ratio = pct / (1 - pct);
+ sleeptime_ns = (long)(throttle_ratio * CPU_THROTTLE_TIMESLICE_NS);
+
+ qemu_mutex_unlock_iothread();
+ atomic_set(&cpu->throttle_thread_scheduled, 0);
+ g_usleep(sleeptime_ns / 1000); /* Convert ns to us for usleep call */
+ qemu_mutex_lock_iothread();
+}
+
+static void cpu_throttle_timer_tick(void *opaque)
+{
+ CPUState *cpu;
+ double pct;
+
+ /* Stop the timer if needed */
+ if (!cpu_throttle_get_percentage()) {
+ return;
+ }
+ CPU_FOREACH(cpu) {
+ if (!atomic_xchg(&cpu->throttle_thread_scheduled, 1)) {
+ async_run_on_cpu(cpu, cpu_throttle_thread, cpu);
+ }
+ }
+
+ pct = (double)cpu_throttle_get_percentage()/100;
+ timer_mod(throttle_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT) +
+ CPU_THROTTLE_TIMESLICE_NS / (1-pct));
+}
+
+void cpu_throttle_set(int new_throttle_pct)
+{
+ /* Ensure throttle percentage is within valid range */
+ new_throttle_pct = MIN(new_throttle_pct, CPU_THROTTLE_PCT_MAX);
+ new_throttle_pct = MAX(new_throttle_pct, CPU_THROTTLE_PCT_MIN);
+
+ atomic_set(&throttle_percentage, new_throttle_pct);
+
+ timer_mod(throttle_timer, qemu_clock_get_ns(QEMU_CLOCK_VIRTUAL_RT) +
+ CPU_THROTTLE_TIMESLICE_NS);
+}
+
+void cpu_throttle_stop(void)
+{
+ atomic_set(&throttle_percentage, 0);
+}
+
+bool cpu_throttle_active(void)
+{
+ return (cpu_throttle_get_percentage() != 0);
+}
+
+int cpu_throttle_get_percentage(void)
+{
+ return atomic_read(&throttle_percentage);
+}
+
void cpu_ticks_init(void)
{
seqlock_init(&timers_state.vm_clock_seqlock, NULL);
vmstate_register(NULL, 0, &vmstate_timers, &timers_state);
+ throttle_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT,
+ cpu_throttle_timer_tick, NULL);
}
void configure_icount(QemuOpts *opts, Error **errp)
icount_sleep = qemu_opt_get_bool(opts, "sleep", true);
if (icount_sleep) {
icount_warp_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT,
- icount_warp_rt, NULL);
+ icount_dummy_timer, NULL);
}
icount_align_option = qemu_opt_get_bool(opts, "align", false);
}
}
-void cpu_clean_all_dirty(void)
-{
- CPUState *cpu;
-
- CPU_FOREACH(cpu) {
- cpu_clean_state(cpu);
- }
-}
-
static int do_vm_stop(RunState state)
{
int ret = 0;
}
}
+static int64_t tcg_get_icount_limit(void)
+{
+ int64_t deadline;
+
+ if (replay_mode != REPLAY_MODE_PLAY) {
+ deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL);
+
+ /* Maintain prior (possibly buggy) behaviour where if no deadline
+ * was set (as there is no QEMU_CLOCK_VIRTUAL timer) or it is more than
+ * INT32_MAX nanoseconds ahead, we still use INT32_MAX
+ * nanoseconds.
+ */
+ if ((deadline < 0) || (deadline > INT32_MAX)) {
+ deadline = INT32_MAX;
+ }
+
+ return qemu_icount_round(deadline);
+ } else {
+ return replay_get_instructions();
+ }
+}
+
static int tcg_cpu_exec(CPUState *cpu)
{
int ret;
#endif
if (use_icount) {
int64_t count;
- int64_t deadline;
int decr;
timers_state.qemu_icount -= (cpu->icount_decr.u16.low
+ cpu->icount_extra);
cpu->icount_decr.u16.low = 0;
cpu->icount_extra = 0;
- deadline = qemu_clock_deadline_ns_all(QEMU_CLOCK_VIRTUAL);
-
- /* Maintain prior (possibly buggy) behaviour where if no deadline
- * was set (as there is no QEMU_CLOCK_VIRTUAL timer) or it is more than
- * INT32_MAX nanoseconds ahead, we still use INT32_MAX
- * nanoseconds.
- */
- if ((deadline < 0) || (deadline > INT32_MAX)) {
- deadline = INT32_MAX;
- }
-
- count = qemu_icount_round(deadline);
+ count = tcg_get_icount_limit();
timers_state.qemu_icount += count;
decr = (count > 0xffff) ? 0xffff : count;
count -= decr;
+ cpu->icount_extra);
cpu->icount_decr.u32 = 0;
cpu->icount_extra = 0;
+ replay_account_executed_instructions();
}
return ret;
}
projects / qemu.git / blobdiff