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/*
* Copyright (C) 2019 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 specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <sys/cdefs.h>
#include <sys/types.h>
#include <map>
#include <mutex>
#include <string>
#include <vector>
#include <android-base/unique_fd.h>
#include <cgroup_map.h>
class ProfileAttribute {
public:
ProfileAttribute(const CgroupController& controller, const std::string& file_name)
: controller_(controller), file_name_(file_name) {}
const CgroupController* controller() const { return &controller_; }
const std::string& file_name() const { return file_name_; }
void Reset(const CgroupController& controller, const std::string& file_name);
bool GetPathForTask(int tid, std::string* path) const;
private:
CgroupController controller_;
std::string file_name_;
};
// Abstract profile element
class ProfileAction {
public:
virtual ~ProfileAction() {}
// Default implementations will fail
virtual bool ExecuteForProcess(uid_t, pid_t) const { return false; };
virtual bool ExecuteForTask(int) const { return false; };
virtual void EnableResourceCaching() {}
virtual void DropResourceCaching() {}
};
// Profile actions
class SetClampsAction : public ProfileAction {
public:
SetClampsAction(int boost, int clamp) noexcept : boost_(boost), clamp_(clamp) {}
virtual bool ExecuteForProcess(uid_t uid, pid_t pid) const;
virtual bool ExecuteForTask(int tid) const;
protected:
int boost_;
int clamp_;
};
// To avoid issues in sdk_mac build
#if defined(__ANDROID__)
class SetTimerSlackAction : public ProfileAction {
public:
SetTimerSlackAction(unsigned long slack) noexcept : slack_(slack) {}
virtual bool ExecuteForTask(int tid) const;
private:
unsigned long slack_;
static bool IsTimerSlackSupported(int tid);
};
#else
class SetTimerSlackAction : public ProfileAction {
public:
SetTimerSlackAction(unsigned long) noexcept {}
virtual bool ExecuteForTask(int) const { return true; }
};
#endif
// Set attribute profile element
class SetAttributeAction : public ProfileAction {
public:
SetAttributeAction(const ProfileAttribute* attribute, const std::string& value)
: attribute_(attribute), value_(value) {}
virtual bool ExecuteForProcess(uid_t uid, pid_t pid) const;
virtual bool ExecuteForTask(int tid) const;
private:
const ProfileAttribute* attribute_;
std::string value_;
};
// Abstract profile element for cached fd
class CachedFdProfileAction : public ProfileAction {
public:
virtual void EnableResourceCaching();
virtual void DropResourceCaching();
protected:
enum FdState {
FDS_INACCESSIBLE = -1,
FDS_APP_DEPENDENT = -2,
FDS_NOT_CACHED = -3,
};
android::base::unique_fd fd_;
mutable std::mutex fd_mutex_;
static bool IsAppDependentPath(const std::string& path);
void InitFd(const std::string& path);
bool IsFdValid() const { return fd_ > FDS_INACCESSIBLE; }
virtual const std::string GetPath() const = 0;
};
// Set cgroup profile element
class SetCgroupAction : public CachedFdProfileAction {
public:
SetCgroupAction(const CgroupController& c, const std::string& p);
virtual bool ExecuteForProcess(uid_t uid, pid_t pid) const;
virtual bool ExecuteForTask(int tid) const;
const CgroupController* controller() const { return &controller_; }
protected:
const std::string GetPath() const override { return controller_.GetTasksFilePath(path_); }
private:
CgroupController controller_;
std::string path_;
static bool AddTidToCgroup(int tid, int fd, const char* controller_name);
};
// Write to file action
class WriteFileAction : public CachedFdProfileAction {
public:
WriteFileAction(const std::string& path, const std::string& value, bool logfailures);
virtual bool ExecuteForProcess(uid_t uid, pid_t pid) const;
virtual bool ExecuteForTask(int tid) const;
protected:
const std::string GetPath() const override { return path_; }
private:
std::string path_, value_;
bool logfailures_;
static bool WriteValueToFile(const std::string& value, const std::string& path,
bool logfailures);
};
class TaskProfile {
public:
TaskProfile() : res_cached_(false) {}
void Add(std::unique_ptr<ProfileAction> e) { elements_.push_back(std::move(e)); }
void MoveTo(TaskProfile* profile);
bool ExecuteForProcess(uid_t uid, pid_t pid) const;
bool ExecuteForTask(int tid) const;
void EnableResourceCaching();
void DropResourceCaching();
private:
bool res_cached_;
std::vector<std::unique_ptr<ProfileAction>> elements_;
};
// Set aggregate profile element
class ApplyProfileAction : public ProfileAction {
public:
ApplyProfileAction(const std::vector<std::shared_ptr<TaskProfile>>& profiles)
: profiles_(profiles) {}
virtual bool ExecuteForProcess(uid_t uid, pid_t pid) const;
virtual bool ExecuteForTask(int tid) const;
virtual void EnableResourceCaching();
virtual void DropResourceCaching();
private:
std::vector<std::shared_ptr<TaskProfile>> profiles_;
};
class TaskProfiles {
public:
// Should be used by all users
static TaskProfiles& GetInstance();
TaskProfile* GetProfile(const std::string& name) const;
const ProfileAttribute* GetAttribute(const std::string& name) const;
void DropResourceCaching() const;
bool SetProcessProfiles(uid_t uid, pid_t pid, const std::vector<std::string>& profiles);
bool SetTaskProfiles(int tid, const std::vector<std::string>& profiles, bool use_fd_cache);
private:
std::map<std::string, std::shared_ptr<TaskProfile>> profiles_;
std::map<std::string, std::unique_ptr<ProfileAttribute>> attributes_;
TaskProfiles();
bool Load(const CgroupMap& cg_map, const std::string& file_name);
};
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