You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
67 lines
2.1 KiB
67 lines
2.1 KiB
// |
|
// Copyright (C) 2016 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. |
|
// |
|
|
|
#ifndef UPDATE_ENGINE_COMMON_CPU_LIMITER_H_ |
|
#define UPDATE_ENGINE_COMMON_CPU_LIMITER_H_ |
|
|
|
#include <brillo/message_loops/message_loop.h> |
|
|
|
namespace chromeos_update_engine { |
|
|
|
// Cgroups cpu shares constants. 1024 is the default shares a standard process |
|
// gets and 2 is the minimum value. We set High as a value that gives the |
|
// update-engine 2x the cpu share of a standard process. |
|
enum class CpuShares : int { |
|
kHigh = 2048, |
|
kNormal = 1024, |
|
kLow = 2, |
|
}; |
|
|
|
// Sets the current process shares to |shares|. Returns true on |
|
// success, false otherwise. |
|
bool SetCpuShares(CpuShares shares); |
|
|
|
class CPULimiter { |
|
public: |
|
CPULimiter() = default; |
|
~CPULimiter(); |
|
|
|
// Sets the cpu shares to low and sets up timeout events to stop the limiter. |
|
void StartLimiter(); |
|
|
|
// Resets the cpu shares to normal and destroys any scheduled timeout sources. |
|
void StopLimiter(); |
|
|
|
// Sets the cpu shares to |shares|. This method can be user at any time, but |
|
// if the limiter is not running, the shares won't be reset to normal. |
|
bool SetCpuShares(CpuShares shares); |
|
|
|
private: |
|
// The cpu shares timeout source callback sets the current cpu shares to |
|
// normal. |
|
void StopLimiterCallback(); |
|
|
|
// Current cpu shares. |
|
CpuShares shares_ = CpuShares::kNormal; |
|
|
|
// The cpu shares management timeout task id. |
|
brillo::MessageLoop::TaskId manage_shares_id_{ |
|
brillo::MessageLoop::kTaskIdNull}; |
|
}; |
|
|
|
} // namespace chromeos_update_engine |
|
|
|
#endif // UPDATE_ENGINE_COMMON_CPU_LIMITER_H_
|
|
|