138 lines
5.2 KiB
C++
138 lines
5.2 KiB
C++
/*
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* Copyright (C) 2017 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 specic language governing permissions and
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* limitations under the License.
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*/
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#define ATRACE_TAG (ATRACE_TAG_POWER | ATRACE_TAG_HAL)
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#define LOG_TAG "libperfmgr"
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#include "perfmgr/FileNode.h"
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#include <android-base/chrono_utils.h>
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#include <android-base/file.h>
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#include <android-base/logging.h>
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#include <android-base/properties.h>
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#include <android-base/stringprintf.h>
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#include <android-base/strings.h>
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#include <utils/Trace.h>
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namespace android {
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namespace perfmgr {
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FileNode::FileNode(std::string name, std::string node_path, std::vector<RequestGroup> req_sorted,
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std::size_t default_val_index, bool reset_on_init, bool truncate, bool hold_fd)
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: Node(std::move(name), std::move(node_path), std::move(req_sorted), default_val_index,
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reset_on_init),
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hold_fd_(hold_fd),
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truncate_(truncate),
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warn_timeout_(android::base::GetBoolProperty("ro.debuggable", false) ? 5ms : 50ms) {}
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std::chrono::milliseconds FileNode::Update(bool log_error) {
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std::size_t value_index = default_val_index_;
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std::chrono::milliseconds expire_time = std::chrono::milliseconds::max();
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// Find the highest outstanding request's expire time
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for (std::size_t i = 0; i < req_sorted_.size(); i++) {
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if (req_sorted_[i].GetExpireTime(&expire_time)) {
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value_index = i;
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break;
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}
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}
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// Update node only if request index changes
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if (value_index != current_val_index_ || reset_on_init_) {
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const std::string& req_value =
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req_sorted_[value_index].GetRequestValue();
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if (ATRACE_ENABLED()) {
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const std::string tag = GetName() + ":" + req_value;
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ATRACE_BEGIN(tag.c_str());
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}
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android::base::Timer t;
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int flags = O_WRONLY | O_CLOEXEC;
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if (GetTruncate()) {
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flags |= O_TRUNC;
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}
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fd_.reset(TEMP_FAILURE_RETRY(open(node_path_.c_str(), flags)));
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if (fd_ == -1 || !android::base::WriteStringToFd(req_value, fd_)) {
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if (log_error) {
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LOG(WARNING) << "Failed to write to node: " << node_path_
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<< " with value: " << req_value << ", fd: " << fd_;
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}
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// Retry in 500ms or sooner
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expire_time = std::min(expire_time, std::chrono::milliseconds(500));
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} else {
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// For regular file system, we need fsync
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fsync(fd_);
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// Some dev node requires file to remain open during the entire hint
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// duration e.g. /dev/cpu_dma_latency, so fd_ is intentionally kept
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// open during any requested value other than default one. If
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// request a default value, node will write the value and then
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// release the fd.
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if ((!hold_fd_) || value_index == default_val_index_) {
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fd_.reset();
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}
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auto duration = t.duration();
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if (duration > warn_timeout_) {
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LOG(WARNING) << "Slow writing to file: '" << node_path_
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<< "' with value: '" << req_value
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<< "' took: " << duration.count() << " ms";
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}
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// Update current index only when succeed
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current_val_index_ = value_index;
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reset_on_init_ = false;
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}
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if (ATRACE_ENABLED()) {
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ATRACE_END();
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}
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}
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return expire_time;
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}
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bool FileNode::GetHoldFd() const {
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return hold_fd_;
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}
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bool FileNode::GetTruncate() const {
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return truncate_;
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}
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void FileNode::DumpToFd(int fd) const {
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std::string node_value;
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if (!android::base::ReadFileToString(node_path_, &node_value)) {
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LOG(ERROR) << "Failed to read node path: " << node_path_;
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}
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node_value = android::base::Trim(node_value);
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std::string buf(
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android::base::StringPrintf("Node Name\t"
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"Node Path\t"
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"Current Index\t"
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"Current Value\t"
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"Hold FD\t"
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"Truncate\n"
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"%s\t%s\t%zu\t%s\t%d\t%d\n",
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name_.c_str(), node_path_.c_str(), current_val_index_,
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node_value.c_str(), hold_fd_, truncate_));
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if (!android::base::WriteStringToFd(buf, fd)) {
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LOG(ERROR) << "Failed to dump fd: " << fd;
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}
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for (std::size_t i = 0; i < req_sorted_.size(); i++) {
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req_sorted_[i].DumpToFd(
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fd, android::base::StringPrintf("\t\tReq%zu:\t", i));
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}
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}
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} // namespace perfmgr
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} // namespace android
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