50 lines
1.7 KiB
C++
50 lines
1.7 KiB
C++
/*
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**
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** Copyright 2015, The Android Open Source Project
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**
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** Licensed under the Apache License, Version 2.0 (the "License");
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** you may not use this file except in compliance with the License.
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** You may obtain a copy of the License at
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**
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** http://www.apache.org/licenses/LICENSE-2.0
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**
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** Unless required by applicable law or agreed to in writing, software
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** distributed under the License is distributed on an "AS IS" BASIS,
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** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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** See the License for the specific language governing permissions and
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** limitations under the License.
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*/
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//
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// Helper class to perform cpu setup (if needed) prior to a profile collection.
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//
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class HardwireCpuHelper {
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public:
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// The constructor for this class checks to see if the 'mpdecision'
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// service is running; if so (and if 'perform' is TRUE), then it
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// disables the service and on-lines all of the available cores/cpus
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// (anything listed in /sys/devices/system/cpu/possible). The
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// destructor will re-enable the mpdecision service if it was
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// previously disabled.
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explicit HardwireCpuHelper(bool perform);
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virtual ~HardwireCpuHelper();
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private:
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bool mpdecision_stopped_;
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// Collect the number of available cpus/cores from /sys/devices/system/cpu/possible
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int GetNumCores();
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// Returns TRUE if the system service 'mpdecision' is running
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bool GetMpdecisionRunning();
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// Online/offline the specified cpu
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void OnlineCore(int whichCore, int onoff);
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// Enable/disable the mpdecision service via the equivalent of
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// setprop ctl.start mpdecision
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// setprop ctl.stop mpdecision
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void StopMpdecision();
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void RestartMpdecision();
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};
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