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/*
* Copyright (C) 2018 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#ifndef __ANDROID_PSI_H__
#define __ANDROID_PSI_H__
#include <sys/cdefs.h>
#include <sys/types.h>
__BEGIN_DECLS
enum psi_stall_type {
PSI_SOME,
PSI_FULL,
PSI_TYPE_COUNT
};
/*
* Initializes psi monitor.
* stall_type, threshold_us and window_us are monitor parameters
* When successful, the function returns file descriptor that can
* be used with poll/epoll syscalls to wait for EPOLLPRI events.
* When unsuccessful, the function returns -1 and errno is set
* appropriately.
*/
int init_psi_monitor(enum psi_stall_type stall_type,
int threshold_us, int window_us);
/*
* Registers psi monitor file descriptor fd on the epoll instance
* referred to by the file descriptor epollfd.
* data parameter will be associated with event's epoll_data.ptr
* member.
*/
int register_psi_monitor(int epollfd, int fd, void* data);
/*
* Unregisters psi monitor file descriptor fd from the epoll instance
* referred to by the file descriptor epollfd.
*/
int unregister_psi_monitor(int epollfd, int fd);
/*
* Destroys psi monitor.
* fd is the file descriptor returned by psi monitor initialization
* routine.
* Note that if user process exits without calling this routine
* kernel will destroy the monitor as its lifetime is linked to
* the file descriptor.
*/
void destroy_psi_monitor(int fd);
__END_DECLS
#endif // __ANDROID_PSI_H__
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