F: softmmu/vl.c
F: softmmu/main.c
F: softmmu/cpus.c
+F: softmmu/cpu-throttle.c
F: qapi/run-state.json
Human Monitor (HMP)
*/
CPUState *cpu_by_arch_id(int64_t id);
-/**
- * cpu_throttle_set:
- * @new_throttle_pct: Percent of sleep time. Valid range is 1 to 99.
- *
- * Throttles all vcpus by forcing them to sleep for the given percentage of
- * time. A throttle_percentage of 25 corresponds to a 75% duty cycle roughly.
- * (example: 10ms sleep for every 30ms awake).
- *
- * cpu_throttle_set can be called as needed to adjust new_throttle_pct.
- * Once the throttling starts, it will remain in effect until cpu_throttle_stop
- * is called.
- */
-void cpu_throttle_set(int new_throttle_pct);
-
-/**
- * cpu_throttle_stop:
- *
- * Stops the vcpu throttling started by cpu_throttle_set.
- */
-void cpu_throttle_stop(void);
-
-/**
- * cpu_throttle_active:
- *
- * Returns: %true if the vcpus are currently being throttled, %false otherwise.
- */
-bool cpu_throttle_active(void);
-
-/**
- * cpu_throttle_get_percentage:
- *
- * Returns the vcpu throttle percentage. See cpu_throttle_set for details.
- *
- * Returns: The throttle percentage in range 1 to 99.
- */
-int cpu_throttle_get_percentage(void);
-
#ifndef CONFIG_USER_ONLY
typedef void (*CPUInterruptHandler)(CPUState *, int);
*/
void qemu_cond_wait_iothread(QemuCond *cond);
+/*
+ * qemu_cond_timedwait_iothread: like the previous, but with timeout
+ */
+void qemu_cond_timedwait_iothread(QemuCond *cond, int ms);
+
/* internal interfaces */
void qemu_fd_register(int fd);
--- /dev/null
+/*
+ * Copyright (c) 2012 SUSE LINUX Products GmbH
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, see
+ * <http://www.gnu.org/licenses/gpl-2.0.html>
+ */
+
+#ifndef SYSEMU_CPU_THROTTLE_H
+#define SYSEMU_CPU_THROTTLE_H
+
+#include "qemu/timer.h"
+
+/**
+ * cpu_throttle_init:
+ *
+ * Initialize the CPU throttling API.
+ */
+void cpu_throttle_init(void);
+
+/**
+ * cpu_throttle_set:
+ * @new_throttle_pct: Percent of sleep time. Valid range is 1 to 99.
+ *
+ * Throttles all vcpus by forcing them to sleep for the given percentage of
+ * time. A throttle_percentage of 25 corresponds to a 75% duty cycle roughly.
+ * (example: 10ms sleep for every 30ms awake).
+ *
+ * cpu_throttle_set can be called as needed to adjust new_throttle_pct.
+ * Once the throttling starts, it will remain in effect until cpu_throttle_stop
+ * is called.
+ */
+void cpu_throttle_set(int new_throttle_pct);
+
+/**
+ * cpu_throttle_stop:
+ *
+ * Stops the vcpu throttling started by cpu_throttle_set.
+ */
+void cpu_throttle_stop(void);
+
+/**
+ * cpu_throttle_active:
+ *
+ * Returns: %true if the vcpus are currently being throttled, %false otherwise.
+ */
+bool cpu_throttle_active(void);
+
+/**
+ * cpu_throttle_get_percentage:
+ *
+ * Returns the vcpu throttle percentage. See cpu_throttle_set for details.
+ *
+ * Returns: The throttle percentage in range 1 to 99.
+ */
+int cpu_throttle_get_percentage(void);
+
+#endif /* SYSEMU_CPU_THROTTLE_H */
#include "socket.h"
#include "sysemu/runstate.h"
#include "sysemu/sysemu.h"
+#include "sysemu/cpu-throttle.h"
#include "rdma.h"
#include "ram.h"
#include "migration/global_state.h"
#include "migration/colo.h"
#include "block.h"
#include "sysemu/sysemu.h"
+#include "sysemu/cpu-throttle.h"
#include "savevm.h"
#include "qemu/iov.h"
#include "multifd.h"
obj-y += arch_init.o
obj-y += cpus.o
+obj-y += cpu-throttle.o
obj-y += balloon.o
obj-y += ioport.o
obj-y += memory.o
--- /dev/null
+/*
+ * QEMU System Emulator
+ *
+ * Copyright (c) 2003-2008 Fabrice Bellard
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
+
+#include "qemu/osdep.h"
+#include "qemu-common.h"
+#include "qemu/thread.h"
+#include "hw/core/cpu.h"
+#include "qemu/main-loop.h"
+#include "sysemu/cpus.h"
+#include "sysemu/cpu-throttle.h"
+
+/* 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
+
+static void cpu_throttle_thread(CPUState *cpu, run_on_cpu_data opaque)
+{
+ double pct;
+ double throttle_ratio;
+ int64_t sleeptime_ns, endtime_ns;
+
+ if (!cpu_throttle_get_percentage()) {
+ return;
+ }
+
+ pct = (double)cpu_throttle_get_percentage() / 100;
+ throttle_ratio = pct / (1 - pct);
+ /* Add 1ns to fix double's rounding error (like 0.9999999...) */
+ sleeptime_ns = (int64_t)(throttle_ratio * CPU_THROTTLE_TIMESLICE_NS + 1);
+ endtime_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + sleeptime_ns;
+ while (sleeptime_ns > 0 && !cpu->stop) {
+ if (sleeptime_ns > SCALE_MS) {
+ qemu_cond_timedwait_iothread(cpu->halt_cond,
+ sleeptime_ns / SCALE_MS);
+ } else {
+ qemu_mutex_unlock_iothread();
+ g_usleep(sleeptime_ns / SCALE_US);
+ qemu_mutex_lock_iothread();
+ }
+ sleeptime_ns = endtime_ns - qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
+ }
+ atomic_set(&cpu->throttle_thread_scheduled, 0);
+}
+
+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,
+ RUN_ON_CPU_NULL);
+ }
+ }
+
+ 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_throttle_init(void)
+{
+ throttle_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT,
+ cpu_throttle_timer_tick, NULL);
+}
#include "hw/boards.h"
#include "hw/hw.h"
+#include "sysemu/cpu-throttle.h"
+
#ifdef CONFIG_LINUX
#include <sys/prctl.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();
}
};
-static void cpu_throttle_thread(CPUState *cpu, run_on_cpu_data opaque)
-{
- double pct;
- double throttle_ratio;
- int64_t sleeptime_ns, endtime_ns;
-
- if (!cpu_throttle_get_percentage()) {
- return;
- }
-
- pct = (double)cpu_throttle_get_percentage()/100;
- throttle_ratio = pct / (1 - pct);
- /* Add 1ns to fix double's rounding error (like 0.9999999...) */
- sleeptime_ns = (int64_t)(throttle_ratio * CPU_THROTTLE_TIMESLICE_NS + 1);
- endtime_ns = qemu_clock_get_ns(QEMU_CLOCK_REALTIME) + sleeptime_ns;
- while (sleeptime_ns > 0 && !cpu->stop) {
- if (sleeptime_ns > SCALE_MS) {
- qemu_cond_timedwait(cpu->halt_cond, &qemu_global_mutex,
- sleeptime_ns / SCALE_MS);
- } else {
- qemu_mutex_unlock_iothread();
- g_usleep(sleeptime_ns / SCALE_US);
- qemu_mutex_lock_iothread();
- }
- sleeptime_ns = endtime_ns - qemu_clock_get_ns(QEMU_CLOCK_REALTIME);
- }
- atomic_set(&cpu->throttle_thread_scheduled, 0);
-}
-
-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,
- RUN_ON_CPU_NULL);
- }
- }
-
- 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);
qemu_spin_init(&timers_state.vm_clock_lock);
vmstate_register(NULL, 0, &vmstate_timers, &timers_state);
- throttle_timer = timer_new_ns(QEMU_CLOCK_VIRTUAL_RT,
- cpu_throttle_timer_tick, NULL);
+ cpu_throttle_init();
}
void configure_icount(QemuOpts *opts, Error **errp)
qemu_cond_wait(cond, &qemu_global_mutex);
}
+void qemu_cond_timedwait_iothread(QemuCond *cond, int ms)
+{
+ qemu_cond_timedwait(cond, &qemu_global_mutex, ms);
+}
+
static bool all_vcpus_paused(void)
{
CPUState *cpu;
#include "ui/input.h"
#include "sysemu/sysemu.h"
#include "sysemu/runstate.h"
+#include "sysemu/cpu-throttle.h"
#include "qapi/error.h"
#include "qapi/qapi-commands-block.h"
#include "qapi/qapi-commands-misc.h"
projects / qemu-xen.git / commitdiff