Merge "Add system_server to system group only if per_app_memcg is true" into pi-dev

#include <unistd.h>

#include "android-base/logging.h"

#include <android-base/properties.h>

#include <android-base/file.h>

#include <android-base/stringprintf.h>

#include <cutils/fs.h>

using android::String8;

using android::base::StringPrintf;

using android::base::WriteStringToFile;

using android::base::GetBoolProperty;

#define CREATE_ERROR(...) StringPrintf("%s:%d: ", __FILE__, __LINE__). \

                              append(StringPrintf(__VA_ARGS__))

          RuntimeAbort(env, __LINE__, "System server process has died. Restarting Zygote!");

      }

      bool low_ram_device = GetBoolProperty("ro.config.low_ram", false);

      bool per_app_memcg = GetBoolProperty("ro.config.per_app_memcg", low_ram_device);

      if (per_app_memcg) {

          // Assign system_server to the correct memory cgroup.

          // Not all devices mount /dev/memcg so check for the file first

          // to avoid unnecessarily printing errors and denials in the logs.

              ALOGE("couldn't write %d to /dev/memcg/system/tasks", pid);

          }

      }

  }

  return pid;

}