Merge "Don't use mem cgroups for pid accounting." into nyc-dev

#include <processgroup/processgroup.h>

// Uncomment line below use memory cgroups for keeping track of (forked) PIDs

// #define USE_MEMCG 1

#define MEM_CGROUP_PATH "/dev/memcg/apps"

#define MEM_CGROUP_TASKS "/dev/memcg/apps/tasks"

#define ACCT_CGROUP_PATH "/acct"

};

static const char* getCgroupRootPath() {

#ifdef USE_MEMCG

    static const char* cgroup_root_path = NULL;

    std::call_once(init_path_flag, [&]() {

            // Check if mem cgroup is mounted, only then check for write-access to avoid

                    ACCT_CGROUP_PATH : MEM_CGROUP_PATH;

            });

    return cgroup_root_path;

#else

    return ACCT_CGROUP_PATH;

#endif

}

static int convertUidToPath(char *path, size_t size, uid_t uid)