Than McIntosh | 07f00fd | 2015-04-17 15:10:43 -0400 | [diff] [blame] | 1 | /* |
| 2 | ** |
| 3 | ** Copyright 2015, The Android Open Source Project |
| 4 | ** |
| 5 | ** Licensed under the Apache License, Version 2.0 (the "License"); |
| 6 | ** you may not use this file except in compliance with the License. |
| 7 | ** You may obtain a copy of the License at |
| 8 | ** |
| 9 | ** http://www.apache.org/licenses/LICENSE-2.0 |
| 10 | ** |
| 11 | ** Unless required by applicable law or agreed to in writing, software |
| 12 | ** distributed under the License is distributed on an "AS IS" BASIS, |
| 13 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 14 | ** See the License for the specific language governing permissions and |
| 15 | ** limitations under the License. |
| 16 | */ |
| 17 | |
| 18 | // |
| 19 | // Helper class to perform cpu setup (if needed) prior to a profile collection. |
| 20 | // |
| 21 | class HardwireCpuHelper { |
| 22 | public: |
| 23 | |
| 24 | // The constructor for this class checks to see if the 'mpdecision' |
| 25 | // service is running; if so (and if 'perform' is TRUE), then it |
| 26 | // disables the service and on-lines all of the available cores/cpus |
| 27 | // (anything listed in /sys/devices/system/cpu/possible). The |
| 28 | // destructor will re-enable the mpdecision service if it was |
| 29 | // previously disabled. |
| 30 | HardwireCpuHelper(bool perform); |
| 31 | virtual ~HardwireCpuHelper(); |
| 32 | |
| 33 | private: |
| 34 | bool mpdecision_stopped_; |
| 35 | |
| 36 | // Collect the number of available cpus/cores from /sys/devices/system/cpu/possible |
| 37 | int GetNumCores(); |
| 38 | |
| 39 | // Returns TRUE if the system service 'mpdecision' is running |
| 40 | bool GetMpdecisionRunning(); |
| 41 | |
| 42 | // Online/offline the specified cpu |
| 43 | void OnlineCore(int whichCore, int onoff); |
| 44 | |
| 45 | // Enable/disable the mpdecision service via the equivalent of |
| 46 | // setprop ctl.start mpdecision |
| 47 | // setprop ctl.stop mpdecision |
| 48 | void StopMpdecision(); |
| 49 | void RestartMpdecision(); |
| 50 | }; |