fa7a05fe5f
Controllers listed in cgroups.json file might fail to mount if kernel is not configured to support them. We need a way to indicate whether a controller was successfully mounted and is usable to avoid logging errors and warnings when a controller that failed to mount is being used. Add flags bitmask to cgrouprc controller descriptor and use a bit to indicate that controller is successfully mounted. Modify cpusets_enabled() and schedboost_enabled() functions to use this bit and report the actual availability of the controller. Bug: 124080437 Test: libcutils_test with cpuset and schedtune controllers disabled Change-Id: I770cc39fe50465146e3205aacf77dc3c56923c5d Signed-off-by: Suren Baghdasaryan <surenb@google.com>
184 lines
5.8 KiB
C++
184 lines
5.8 KiB
C++
/*
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* Copyright (C) 2019 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_NDEBUG 0
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#define LOG_TAG "libprocessgroup"
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#include <errno.h>
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#include <fcntl.h>
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#include <grp.h>
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#include <pwd.h>
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#include <sys/mman.h>
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#include <sys/mount.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <time.h>
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#include <unistd.h>
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#include <regex>
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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/unique_fd.h>
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#include <cgroup_map.h>
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#include <json/reader.h>
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#include <json/value.h>
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#include <processgroup/processgroup.h>
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using android::base::GetBoolProperty;
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using android::base::StringPrintf;
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using android::base::unique_fd;
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static constexpr const char* CGROUP_PROCS_FILE = "/cgroup.procs";
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static constexpr const char* CGROUP_TASKS_FILE = "/tasks";
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static constexpr const char* CGROUP_TASKS_FILE_V2 = "/cgroup.tasks";
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uint32_t CgroupController::version() const {
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CHECK(HasValue());
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return ACgroupController_getVersion(controller_);
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}
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const char* CgroupController::name() const {
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CHECK(HasValue());
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return ACgroupController_getName(controller_);
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}
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const char* CgroupController::path() const {
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CHECK(HasValue());
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return ACgroupController_getPath(controller_);
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}
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bool CgroupController::HasValue() const {
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return controller_ != nullptr;
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}
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bool CgroupController::IsUsable() const {
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if (!HasValue()) return false;
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uint32_t flags = ACgroupController_getFlags(controller_);
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return (flags & CGROUPRC_CONTROLLER_FLAG_MOUNTED) != 0;
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}
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std::string CgroupController::GetTasksFilePath(const std::string& rel_path) const {
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std::string tasks_path = path();
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if (!rel_path.empty()) {
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tasks_path += "/" + rel_path;
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}
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return (version() == 1) ? tasks_path + CGROUP_TASKS_FILE : tasks_path + CGROUP_TASKS_FILE_V2;
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}
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std::string CgroupController::GetProcsFilePath(const std::string& rel_path, uid_t uid,
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pid_t pid) const {
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std::string proc_path(path());
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proc_path.append("/").append(rel_path);
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proc_path = regex_replace(proc_path, std::regex("<uid>"), std::to_string(uid));
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proc_path = regex_replace(proc_path, std::regex("<pid>"), std::to_string(pid));
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return proc_path.append(CGROUP_PROCS_FILE);
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}
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bool CgroupController::GetTaskGroup(int tid, std::string* group) const {
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std::string file_name = StringPrintf("/proc/%d/cgroup", tid);
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std::string content;
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if (!android::base::ReadFileToString(file_name, &content)) {
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PLOG(ERROR) << "Failed to read " << file_name;
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return false;
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}
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// if group is null and tid exists return early because
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// user is not interested in cgroup membership
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if (group == nullptr) {
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return true;
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}
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std::string cg_tag = StringPrintf(":%s:", name());
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size_t start_pos = content.find(cg_tag);
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if (start_pos == std::string::npos) {
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return false;
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}
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start_pos += cg_tag.length() + 1; // skip '/'
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size_t end_pos = content.find('\n', start_pos);
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if (end_pos == std::string::npos) {
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*group = content.substr(start_pos, std::string::npos);
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} else {
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*group = content.substr(start_pos, end_pos - start_pos);
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}
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return true;
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}
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CgroupMap::CgroupMap() {
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if (!LoadRcFile()) {
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LOG(ERROR) << "CgroupMap::LoadRcFile called for [" << getpid() << "] failed";
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}
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}
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CgroupMap& CgroupMap::GetInstance() {
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// Deliberately leak this object to avoid a race between destruction on
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// process exit and concurrent access from another thread.
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static auto* instance = new CgroupMap;
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return *instance;
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}
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bool CgroupMap::LoadRcFile() {
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if (!loaded_) {
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loaded_ = (ACgroupFile_getVersion() != 0);
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}
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return loaded_;
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}
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void CgroupMap::Print() const {
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if (!loaded_) {
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LOG(ERROR) << "CgroupMap::Print called for [" << getpid()
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<< "] failed, RC file was not initialized properly";
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return;
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}
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LOG(INFO) << "File version = " << ACgroupFile_getVersion();
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LOG(INFO) << "File controller count = " << ACgroupFile_getControllerCount();
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LOG(INFO) << "Mounted cgroups:";
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auto controller_count = ACgroupFile_getControllerCount();
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for (uint32_t i = 0; i < controller_count; ++i) {
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const ACgroupController* controller = ACgroupFile_getController(i);
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LOG(INFO) << "\t" << ACgroupController_getName(controller) << " ver "
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<< ACgroupController_getVersion(controller) << " path "
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<< ACgroupController_getFlags(controller) << " flags "
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<< ACgroupController_getPath(controller);
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}
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}
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CgroupController CgroupMap::FindController(const std::string& name) const {
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if (!loaded_) {
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LOG(ERROR) << "CgroupMap::FindController called for [" << getpid()
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<< "] failed, RC file was not initialized properly";
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return CgroupController(nullptr);
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}
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auto controller_count = ACgroupFile_getControllerCount();
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for (uint32_t i = 0; i < controller_count; ++i) {
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const ACgroupController* controller = ACgroupFile_getController(i);
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if (name == ACgroupController_getName(controller)) {
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return CgroupController(controller);
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}
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}
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return CgroupController(nullptr);
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}
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