blob: bc5b5cf94b84fc1fe04cf2b1a512e453640f75b8 [file] [log] [blame]
/*
**
** 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();
};