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/*
* Copyright (C) 2017 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 specic language governing permissions and
* limitations under the License.
*/
#define LOG_TAG "libperfmgr"
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include "perfmgr/Node.h"
namespace android {
namespace perfmgr {
Node::Node(std::string name, std::string node_path,
std::vector<RequestGroup> req_sorted, std::size_t default_val_index,
bool reset_on_init, bool hold_fd)
: name_(name),
node_path_(node_path),
req_sorted_(std::move(req_sorted)),
default_val_index_(default_val_index),
reset_on_init_(reset_on_init),
hold_fd_(hold_fd) {
if (reset_on_init) {
// Assigning an invalid value so the next Update() will update the
// Node's value to default
current_val_index_ = req_sorted_.size();
Update();
} else {
current_val_index_ = default_val_index;
}
}
bool Node::AddRequest(std::size_t value_index, const std::string& hint_type,
ReqTime end_time) {
if (value_index >= req_sorted_.size()) {
LOG(ERROR) << "Value index out of bound: " << value_index
<< " ,size: " << req_sorted_.size();
return false;
}
// Add/Update request to the new end_time for the specific hint_type
req_sorted_[value_index].AddRequest(hint_type, end_time);
return true;
}
bool Node::RemoveRequest(const std::string& hint_type) {
bool ret = false;
// Remove all requests for the specific hint_type
for (auto& value : req_sorted_) {
ret = value.RemoveRequest(hint_type) || ret;
}
return ret;
}
std::chrono::milliseconds Node::Update() {
std::size_t value_index = default_val_index_;
std::chrono::milliseconds expire_time = std::chrono::milliseconds::max();
// Find the highest outstanding request's expire time
for (std::size_t i = 0; i < req_sorted_.size(); i++) {
if (req_sorted_[i].GetExpireTime(&expire_time)) {
value_index = i;
break;
}
}
// Update node only if request index changes
if (value_index != current_val_index_) {
std::string req_value = req_sorted_[value_index].GetRequestValue();
fd_.reset(TEMP_FAILURE_RETRY(
open(node_path_.c_str(), O_WRONLY | O_CLOEXEC | O_TRUNC)));
if (fd_ == -1 || !android::base::WriteStringToFd(req_value, fd_)) {
LOG(ERROR) << "Failed to write to node: " << node_path_
<< " with value: " << req_value << ", fd: " << fd_;
// Retry in 500ms or sooner
expire_time = std::min(expire_time, std::chrono::milliseconds(500));
} else {
// For regular file system, we need fsync
fsync(fd_);
// Some dev node requires file to remain open during the entire hint
// duration e.g. /dev/cpu_dma_latency, so fd_ is intentionally kept
// open during any requested value other than default one. If
// request a default value, node will write the value and then
// release the fd.
if ((!hold_fd_) || value_index == default_val_index_) {
fd_.reset();
}
// Update current index only when succeed
current_val_index_ = value_index;
}
}
return expire_time;
}
std::string Node::GetName() const {
return name_;
}
std::string Node::GetPath() const {
return node_path_;
}
bool Node::GetValueIndex(const std::string value, std::size_t* index) const {
bool found = false;
for (std::size_t i = 0; i < req_sorted_.size(); i++) {
if (req_sorted_[i].GetRequestValue() == value) {
*index = i;
found = true;
break;
}
}
return found;
}
std::size_t Node::GetDefaultIndex() const {
return default_val_index_;
}
bool Node::GetResetOnInit() const {
return reset_on_init_;
}
bool Node::GetHoldFd() const {
return hold_fd_;
}
std::vector<std::string> Node::GetValues() const {
std::vector<std::string> values;
for (const auto& value : req_sorted_) {
values.emplace_back(value.GetRequestValue());
}
return values;
}
void Node::DumpToFd(int fd) {
std::string node_value;
if (!android::base::ReadFileToString(node_path_, &node_value)) {
LOG(ERROR) << "Failed to read node path: " << node_path_;
}
node_value = android::base::Trim(node_value);
std::string buf(android::base::StringPrintf(
"%s\t%s\t%zu\t%s\n", name_.c_str(), node_path_.c_str(),
current_val_index_, node_value.c_str()));
if (!android::base::WriteStringToFd(buf, fd)) {
LOG(ERROR) << "Failed to dump fd: " << fd;
}
}
} // namespace perfmgr
} // namespace android
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