93 lines
2.6 KiB
C
93 lines
2.6 KiB
C
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef __ANDROID_PSI_H__
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#define __ANDROID_PSI_H__
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#include <sys/cdefs.h>
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#include <sys/types.h>
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__BEGIN_DECLS
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#define PSI_PATH_MEMORY "/proc/pressure/memory"
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#define PSI_PATH_IO "/proc/pressure/io"
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#define PSI_PATH_CPU "/proc/pressure/cpu"
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enum psi_stall_type {
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PSI_SOME,
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PSI_FULL,
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PSI_TYPE_COUNT
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};
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struct psi_stats {
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float avg10;
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float avg60;
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float avg300;
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unsigned long total;
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};
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struct psi_data {
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struct psi_stats mem_stats[PSI_TYPE_COUNT];
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struct psi_stats io_stats[PSI_TYPE_COUNT];
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struct psi_stats cpu_stats[PSI_TYPE_COUNT];
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};
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/*
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* Initializes psi monitor.
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* stall_type, threshold_us and window_us are monitor parameters
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* When successful, the function returns file descriptor that can
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* be used with poll/epoll syscalls to wait for EPOLLPRI events.
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* When unsuccessful, the function returns -1 and errno is set
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* appropriately.
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*/
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int init_psi_monitor(enum psi_stall_type stall_type,
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int threshold_us, int window_us);
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/*
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* Registers psi monitor file descriptor fd on the epoll instance
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* referred to by the file descriptor epollfd.
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* data parameter will be associated with event's epoll_data.ptr
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* member.
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*/
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int register_psi_monitor(int epollfd, int fd, void* data);
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/*
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* Unregisters psi monitor file descriptor fd from the epoll instance
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* referred to by the file descriptor epollfd.
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*/
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int unregister_psi_monitor(int epollfd, int fd);
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/*
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* Destroys psi monitor.
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* fd is the file descriptor returned by psi monitor initialization
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* routine.
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* Note that if user process exits without calling this routine
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* kernel will destroy the monitor as its lifetime is linked to
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* the file descriptor.
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*/
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void destroy_psi_monitor(int fd);
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/*
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* Parse psi file line content. Expected file format is:
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* some avg10=0.00 avg60=0.00 avg300=0.00 total=0
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* full avg10=0.00 avg60=0.00 avg300=0.00 total=0
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*/
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int parse_psi_line(char *line, enum psi_stall_type stall_type, struct psi_stats stats[]);
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__END_DECLS
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#endif // __ANDROID_PSI_H__
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