Revert "libprocessgroup: Remove cgroup.rc file"
Revert submission 3212512
Reason for revert: Droidmonitor created revert due to b/372273614. Will be verifying through ABTD before submission.
Reverted changes: /q/submissionid:3212512
Change-Id: I37568516e973cb940f1229d52f94b8dc801da2ab
diff --git a/libprocessgroup/util/util.cpp b/libprocessgroup/util/util.cpp
index bff4c6f..9b88a22 100644
--- a/libprocessgroup/util/util.cpp
+++ b/libprocessgroup/util/util.cpp
@@ -18,33 +18,9 @@
#include <algorithm>
#include <iterator>
-#include <optional>
-#include <string_view>
-
-#include <mntent.h>
-
-#include <android-base/file.h>
-#include <android-base/logging.h>
-#include <android-base/properties.h>
-#include <android-base/stringprintf.h>
-#include <json/reader.h>
-#include <json/value.h>
-
-#include "../build_flags.h"
-#include "../internal.h"
-
-using android::base::GetUintProperty;
namespace {
-constexpr const char* CGROUPS_DESC_FILE = "/etc/cgroups.json";
-constexpr const char* CGROUPS_DESC_VENDOR_FILE = "/vendor/etc/cgroups.json";
-constexpr const char* TEMPLATE_CGROUPS_DESC_API_FILE = "/etc/task_profiles/cgroups_%u.json";
-
-// This should match the publicly declared value in processgroup.h,
-// but we don't want this library to depend on libprocessgroup.
-constexpr std::string CGROUPV2_HIERARCHY_NAME_INTERNAL = "cgroup2";
-
const char SEP = '/';
std::string DeduplicateAndTrimSeparators(const std::string& path) {
@@ -66,135 +42,9 @@
return ret;
}
-void MergeCgroupToDescriptors(CgroupDescriptorMap* descriptors, const Json::Value& cgroup,
- const std::string& name, const std::string& root_path,
- int cgroups_version) {
- const std::string cgroup_path = cgroup["Path"].asString();
- std::string path;
-
- if (!root_path.empty()) {
- path = root_path;
- if (cgroup_path != ".") {
- path += "/";
- path += cgroup_path;
- }
- } else {
- path = cgroup_path;
- }
-
- uint32_t controller_flags = 0;
-
- if (cgroup["NeedsActivation"].isBool() && cgroup["NeedsActivation"].asBool()) {
- controller_flags |= CGROUPRC_CONTROLLER_FLAG_NEEDS_ACTIVATION;
- }
-
- if (cgroup["Optional"].isBool() && cgroup["Optional"].asBool()) {
- controller_flags |= CGROUPRC_CONTROLLER_FLAG_OPTIONAL;
- }
-
- uint32_t max_activation_depth = UINT32_MAX;
- if (cgroup.isMember("MaxActivationDepth")) {
- max_activation_depth = cgroup["MaxActivationDepth"].asUInt();
- }
-
- CgroupDescriptor descriptor(
- cgroups_version, name, path, std::strtoul(cgroup["Mode"].asString().c_str(), 0, 8),
- cgroup["UID"].asString(), cgroup["GID"].asString(), controller_flags,
- max_activation_depth);
-
- auto iter = descriptors->find(name);
- if (iter == descriptors->end()) {
- descriptors->emplace(name, descriptor);
- } else {
- iter->second = descriptor;
- }
-}
-
-bool ReadDescriptorsFromFile(const std::string& file_name, CgroupDescriptorMap* descriptors) {
- static constexpr bool force_memcg_v2 = android::libprocessgroup_flags::force_memcg_v2();
- std::vector<CgroupDescriptor> result;
- std::string json_doc;
-
- if (!android::base::ReadFileToString(file_name, &json_doc)) {
- PLOG(ERROR) << "Failed to read task profiles from " << file_name;
- return false;
- }
-
- Json::CharReaderBuilder builder;
- std::unique_ptr<Json::CharReader> reader(builder.newCharReader());
- Json::Value root;
- std::string errorMessage;
- if (!reader->parse(&*json_doc.begin(), &*json_doc.end(), &root, &errorMessage)) {
- LOG(ERROR) << "Failed to parse cgroups description: " << errorMessage;
- return false;
- }
-
- if (root.isMember("Cgroups")) {
- const Json::Value& cgroups = root["Cgroups"];
- for (Json::Value::ArrayIndex i = 0; i < cgroups.size(); ++i) {
- std::string name = cgroups[i]["Controller"].asString();
-
- if (force_memcg_v2 && name == "memory") continue;
-
- MergeCgroupToDescriptors(descriptors, cgroups[i], name, "", 1);
- }
- }
-
- bool memcgv2_present = false;
- std::string root_path;
- if (root.isMember("Cgroups2")) {
- const Json::Value& cgroups2 = root["Cgroups2"];
- root_path = cgroups2["Path"].asString();
- MergeCgroupToDescriptors(descriptors, cgroups2, CGROUPV2_HIERARCHY_NAME_INTERNAL, "", 2);
-
- const Json::Value& childGroups = cgroups2["Controllers"];
- for (Json::Value::ArrayIndex i = 0; i < childGroups.size(); ++i) {
- std::string name = childGroups[i]["Controller"].asString();
-
- if (force_memcg_v2 && name == "memory") memcgv2_present = true;
-
- MergeCgroupToDescriptors(descriptors, childGroups[i], name, root_path, 2);
- }
- }
-
- if (force_memcg_v2 && !memcgv2_present) {
- LOG(INFO) << "Forcing memcg to v2 hierarchy";
- Json::Value memcgv2;
- memcgv2["Controller"] = "memory";
- memcgv2["NeedsActivation"] = true;
- memcgv2["Path"] = ".";
- memcgv2["Optional"] = true; // In case of cgroup_disabled=memory, so we can still boot
- MergeCgroupToDescriptors(descriptors, memcgv2, "memory",
- root_path.empty() ? CGROUP_V2_ROOT_DEFAULT : root_path, 2);
- }
-
- return true;
-}
-
-using MountDir = std::string;
-using MountOpts = std::string;
-static std::optional<std::map<MountDir, MountOpts>> ReadCgroupV1Mounts() {
- FILE* fp = setmntent("/proc/mounts", "r");
- if (fp == nullptr) {
- PLOG(ERROR) << "Failed to read mounts";
- return std::nullopt;
- }
-
- std::map<MountDir, MountOpts> mounts;
- const std::string_view CGROUP_V1_TYPE = "cgroup";
- for (mntent* mentry = getmntent(fp); mentry != nullptr; mentry = getmntent(fp)) {
- if (mentry->mnt_type && CGROUP_V1_TYPE == mentry->mnt_type &&
- mentry->mnt_dir && mentry->mnt_opts) {
- mounts[mentry->mnt_dir] = mentry->mnt_opts;
- }
- }
- endmntent(fp);
-
- return mounts;
-}
-
} // anonymous namespace
+namespace util {
unsigned int GetCgroupDepth(const std::string& controller_root, const std::string& cgroup_path) {
const std::string deduped_root = DeduplicateAndTrimSeparators(controller_root);
@@ -206,47 +56,4 @@
return std::count(deduped_path.begin() + deduped_root.size(), deduped_path.end(), SEP);
}
-bool ReadDescriptors(CgroupDescriptorMap* descriptors) {
- // load system cgroup descriptors
- if (!ReadDescriptorsFromFile(CGROUPS_DESC_FILE, descriptors)) {
- return false;
- }
-
- // load API-level specific system cgroups descriptors if available
- unsigned int api_level = GetUintProperty<unsigned int>("ro.product.first_api_level", 0);
- if (api_level > 0) {
- std::string api_cgroups_path =
- android::base::StringPrintf(TEMPLATE_CGROUPS_DESC_API_FILE, api_level);
- if (!access(api_cgroups_path.c_str(), F_OK) || errno != ENOENT) {
- if (!ReadDescriptorsFromFile(api_cgroups_path, descriptors)) {
- return false;
- }
- }
- }
-
- // load vendor cgroup descriptors if the file exists
- if (!access(CGROUPS_DESC_VENDOR_FILE, F_OK) &&
- !ReadDescriptorsFromFile(CGROUPS_DESC_VENDOR_FILE, descriptors)) {
- return false;
- }
-
- // check for v1 mount/usability status
- std::optional<std::map<MountDir, MountOpts>> v1Mounts;
- for (auto& [name, descriptor] : *descriptors) {
- const CgroupController* const controller = descriptor.controller();
-
- if (controller->version() != 1) continue;
-
- // Read only once, and only if we have at least one v1 controller
- if (!v1Mounts) {
- v1Mounts = ReadCgroupV1Mounts();
- if (!v1Mounts) return false;
- }
-
- if (const auto it = v1Mounts->find(controller->path()); it != v1Mounts->end()) {
- if (it->second.contains(controller->name())) descriptor.set_mounted(true);
- }
- }
-
- return true;
-}
+} // namespace util