eecd7ddfcf
New library to create, register and destroy PSI monitors in a consistent way with lmkd. Test: used within lmkd Bug: 111308141 Change-Id: If243a97f178e90fe41e2de90c7b858ba82440279 Signed-off-by: Suren Baghdasaryan <surenb@google.com>
99 lines
2.5 KiB
C
99 lines
2.5 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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#define LOG_TAG "libpsi"
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#include <errno.h>
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#include <string.h>
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#include <sys/epoll.h>
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#include <log/log.h>
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#include "psi/psi.h"
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#define PSI_MON_FILE_MEMORY "/proc/pressure/memory"
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static const char* stall_type_name[] = {
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"some",
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"full",
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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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int fd;
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int res;
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char buf[256];
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fd = TEMP_FAILURE_RETRY(open(PSI_MON_FILE_MEMORY, O_WRONLY | O_CLOEXEC));
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if (fd < 0) {
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ALOGE("No kernel psi monitor support (errno=%d)", errno);
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return -1;
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}
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switch (stall_type) {
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case (PSI_SOME):
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case (PSI_FULL):
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res = snprintf(buf, sizeof(buf), "%s %d %d",
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stall_type_name[stall_type], threshold_us, window_us);
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break;
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default:
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ALOGE("Invalid psi stall type: %d", stall_type);
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errno = EINVAL;
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goto err;
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}
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if (res >= (ssize_t)sizeof(buf)) {
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ALOGE("%s line overflow for psi stall type '%s'",
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PSI_MON_FILE_MEMORY, stall_type_name[stall_type]);
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errno = EINVAL;
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goto err;
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}
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res = TEMP_FAILURE_RETRY(write(fd, buf, strlen(buf) + 1));
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if (res < 0) {
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ALOGE("%s write failed for psi stall type '%s'; errno=%d",
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PSI_MON_FILE_MEMORY, stall_type_name[stall_type], errno);
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goto err;
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}
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return fd;
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err:
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close(fd);
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return -1;
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}
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int register_psi_monitor(int epollfd, int fd, void* data) {
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int res;
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struct epoll_event epev;
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epev.events = EPOLLPRI;
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epev.data.ptr = data;
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res = epoll_ctl(epollfd, EPOLL_CTL_ADD, fd, &epev);
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if (res < 0) {
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ALOGE("epoll_ctl for psi monitor failed; errno=%d", errno);
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}
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return res;
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}
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int unregister_psi_monitor(int epollfd, int fd) {
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return epoll_ctl(epollfd, EPOLL_CTL_DEL, fd, NULL);
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}
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void destroy_psi_monitor(int fd) {
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if (fd >= 0) {
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close(fd);
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}
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}
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