| /* |
| ** |
| ** Copyright 2015, 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. |
| */ |
| |
| // |
| // Helper class to perform cpu setup (if needed) prior to a profile collection. |
| // |
| class HardwireCpuHelper { |
| public: |
| |
| // The constructor for this class checks to see if the 'mpdecision' |
| // service is running; if so (and if 'perform' is TRUE), then it |
| // disables the service and on-lines all of the available cores/cpus |
| // (anything listed in /sys/devices/system/cpu/possible). The |
| // destructor will re-enable the mpdecision service if it was |
| // previously disabled. |
| explicit HardwireCpuHelper(bool perform); |
| virtual ~HardwireCpuHelper(); |
| |
| private: |
| bool mpdecision_stopped_; |
| |
| // Collect the number of available cpus/cores from /sys/devices/system/cpu/possible |
| int GetNumCores(); |
| |
| // Returns TRUE if the system service 'mpdecision' is running |
| bool GetMpdecisionRunning(); |
| |
| // Online/offline the specified cpu |
| void OnlineCore(int whichCore, int onoff); |
| |
| // Enable/disable the mpdecision service via the equivalent of |
| // setprop ctl.start mpdecision |
| // setprop ctl.stop mpdecision |
| void StopMpdecision(); |
| void RestartMpdecision(); |
| }; |