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Commit 9b54f0f7 authored by Riddle Hsu's avatar Riddle Hsu Committed by android-build-merger
Browse files

Merge "Allow to drop existing fd cache of cgroup path" 

am: 1e138919

Change-Id: I65caea7fddf5567f02e31f63562fe47174a3bb4b
parents 5c7c698a 1e138919

libprocessgroup/include/processgroup/processgroup.h

+5 −0
Original line number Diff line number Diff line
@@ -39,6 +39,11 @@ static constexpr const char* CGROUPS_RC_PATH = "/dev/cgroup_info/cgroup.rc"; 


bool UsePerAppMemcg();



// Drop the fd cache of cgroup path. It is used for when resource caching is enabled and a process

// loses the access to the path, the access checking (See SetCgroupAction::EnableResourceCaching)

// should be active again. E.g. Zygote specialization for child process.

void DropTaskProfilesResourceCaching();



// Return 0 and removes the cgroup if there are no longer any processes in it.

// Returns -1 in the case of an error occurring or if there are processes still running

// even after retrying for up to 200ms.

libprocessgroup/processgroup.cpp

+4 −0
Original line number Diff line number Diff line
@@ -111,6 +111,10 @@ static bool isMemoryCgroupSupported() { 
    return memcg_supported;

}



void DropTaskProfilesResourceCaching() {

    TaskProfiles::GetInstance().DropResourceCaching();

}



bool SetProcessProfiles(uid_t uid, pid_t pid, const std::vector<std::string>& profiles,

                        bool use_fd_cache) {

    const TaskProfiles& tp = TaskProfiles::GetInstance();

libprocessgroup/task_profiles.cpp

+27 −0
Original line number Diff line number Diff line
@@ -173,6 +173,15 @@ void SetCgroupAction::EnableResourceCaching() { 
    fd_ = std::move(fd);

}



void SetCgroupAction::DropResourceCaching() {

    std::lock_guard<std::mutex> lock(fd_mutex_);

    if (fd_ == FDS_NOT_CACHED) {

        return;

    }



    fd_.reset(FDS_NOT_CACHED);

}



bool SetCgroupAction::AddTidToCgroup(int tid, int fd) {

    if (tid <= 0) {

        return true;
@@ -292,6 +301,24 @@ void TaskProfile::EnableResourceCaching() { 
    res_cached_ = true;

}



void TaskProfile::DropResourceCaching() {

    if (!res_cached_) {

        return;

    }



    for (auto& element : elements_) {

        element->DropResourceCaching();

    }



    res_cached_ = false;

}



void TaskProfiles::DropResourceCaching() const {

    for (auto& iter : profiles_) {

        iter.second->DropResourceCaching();

    }

}



TaskProfiles& TaskProfiles::GetInstance() {

    // Deliberately leak this object to avoid a race between destruction on

    // process exit and concurrent access from another thread.

libprocessgroup/task_profiles.h

+4 −0
Original line number Diff line number Diff line
@@ -51,6 +51,7 @@ class ProfileAction { 
    virtual bool ExecuteForTask(int) const { return false; };



    virtual void EnableResourceCaching() {}

    virtual void DropResourceCaching() {}

};



// Profile actions
@@ -114,6 +115,7 @@ class SetCgroupAction : public ProfileAction { 
    virtual bool ExecuteForProcess(uid_t uid, pid_t pid) const;

    virtual bool ExecuteForTask(int tid) const;

    virtual void EnableResourceCaching();

    virtual void DropResourceCaching();



    const CgroupController* controller() const { return &controller_; }

    std::string path() const { return path_; }
@@ -145,6 +147,7 @@ class TaskProfile { 
    bool ExecuteForProcess(uid_t uid, pid_t pid) const;

    bool ExecuteForTask(int tid) const;

    void EnableResourceCaching();

    void DropResourceCaching();



  private:

    bool res_cached_;
@@ -158,6 +161,7 @@ class TaskProfiles { 


    TaskProfile* GetProfile(const std::string& name) const;

    const ProfileAttribute* GetAttribute(const std::string& name) const;

    void DropResourceCaching() const;



  private:

    std::map<std::string, std::unique_ptr<TaskProfile>> profiles_;