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/*
* 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);
/**
* cpu_throttle_dirty_sync_timer_tick:
*
* Dirty sync timer hook.
*/
void cpu_throttle_dirty_sync_timer_tick(void *opaque);
/**
* cpu_throttle_dirty_sync_timer:
*
* Start or stop the dirty sync timer.
*/
void cpu_throttle_dirty_sync_timer(bool enable);
#endif /* SYSEMU_CPU_THROTTLE_H */
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