Merge "Implement native PerformanceHint API" into sc-dev am: ae7324cddc (1f8765ba) · Commits · e / os / android_frameworks_native

include/private/performance_hint_private.h

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		/*
		* Copyright (C) 2021 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 ANDROID_PRIVATE_NATIVE_PERFORMANCE_HINT_PRIVATE_H
		#define ANDROID_PRIVATE_NATIVE_PERFORMANCE_HINT_PRIVATE_H

		#include <stdint.h>

		__BEGIN_DECLS

		struct APerformanceHintManager;
		struct APerformanceHintSession;

		/**
		* An opaque type representing a handle to a performance hint manager.
		* It must be released after use.
		*
		* <p>To use:<ul>
		* <li>Obtain the performance hint manager instance by calling
		* {@link APerformanceHint_getManager} function.</li>
		* <li>Create an {@link APerformanceHintSession} with
		* {@link APerformanceHint_createSession}.</li>
		* <li>Get the preferred update rate in nanoseconds with
		* {@link APerformanceHint_getPreferredUpdateRateNanos}.</li>
		*/
		typedef struct APerformanceHintManager APerformanceHintManager;

		/**
		* An opaque type representing a handle to a performance hint session.
		* A session can only be acquired from a {@link APerformanceHintManager}
		* with {@link APerformanceHint_getPreferredUpdateRateNanos}. It must be
		* freed with {@link APerformanceHint_closeSession} after use.
		*
		* A Session represents a group of threads with an inter-related workload such that hints for
		* their performance should be considered as a unit. The threads in a given session should be
		* long-life and not created or destroyed dynamically.
		*
		* <p>Each session is expected to have a periodic workload with a target duration for each
		* cycle. The cycle duration is likely greater than the target work duration to allow other
		* parts of the pipeline to run within the available budget. For example, a renderer thread may
		* work at 60hz in order to produce frames at the display's frame but have a target work
		* duration of only 6ms.</p>
		*
		* <p>After each cycle of work, the client is expected to use
		* {@link APerformanceHint_reportActualWorkDuration} to report the actual time taken to
		* complete.</p>
		*
		* <p>To use:<ul>
		* <li>Update a sessions target duration for each cycle of work
		* with {@link APerformanceHint_updateTargetWorkDuration}.</li>
		* <li>Report the actual duration for the last cycle of work with
		* {@link APerformanceHint_reportActualWorkDuration}.</li>
		* <li>Release the session instance with
		* {@link APerformanceHint_closeSession}.</li></ul></p>
		*/
		typedef struct APerformanceHintSession APerformanceHintSession;

		/**
		* Acquire an instance of the performance hint manager.
		*
		* @return manager instance on success, nullptr on failure.
		*/
		APerformanceHintManager* APerformanceHint_getManager();

		/**
		* Creates a session for the given set of threads and sets their initial target work
		* duration.
		* @param manager The performance hint manager instance.
		* @param threadIds The list of threads to be associated with this session. They must be part of
		* this app's thread group.
		* @param size the size of threadIds.
		* @param initialTargetWorkDurationNanos The desired duration in nanoseconds for the new session.
		* This must be positive.
		* @return manager instance on success, nullptr on failure.
		*/
		APerformanceHintSession* APerformanceHint_createSession(APerformanceHintManager* manager,
		const int32_t* threadIds, size_t size,
		int64_t initialTargetWorkDurationNanos);

		/**
		* Get preferred update rate information for this device.
		*
		* @param manager The performance hint manager instance.
		* @return the preferred update rate supported by device software.
		*/
		int64_t APerformanceHint_getPreferredUpdateRateNanos(APerformanceHintManager* manager);

		/**
		* Updates this session's target duration for each cycle of work.
		*
		* @param session The performance hint session instance to update.
		* @param targetDurationNanos the new desired duration in nanoseconds. This must be positive.
		* @return 0 on success
		* EINVAL if targetDurationNanos is not positive.
		* EPIPE if communication with the system service has failed.
		*/
		int APerformanceHint_updateTargetWorkDuration(APerformanceHintSession* session,
		int64_t targetDurationNanos);

		/**
		* Reports the actual duration for the last cycle of work.
		*
		* <p>The system will attempt to adjust the core placement of the threads within the thread
		* group and/or the frequency of the core on which they are run to bring the actual duration
		* close to the target duration.</p>
		*
		* @param session The performance hint session instance to update.
		* @param actualDurationNanos how long the thread group took to complete its last task in
		* nanoseconds. This must be positive.
		* @return 0 on success
		* EINVAL if actualDurationNanos is not positive.
		* EPIPE if communication with the system service has failed.
		*/
		int APerformanceHint_reportActualWorkDuration(APerformanceHintSession* session,
		int64_t actualDurationNanos);

		/**
		* Release the performance hint manager pointer acquired via
		* {@link APerformanceHint_createSession}.
		*
		* @param session The performance hint session instance to release.
		*/
		void APerformanceHint_closeSession(APerformanceHintSession* session);

		/**
		* For testing only.
		*/
		void APerformanceHint_setIHintManagerForTesting(void* iManager);

		__END_DECLS

		#endif // ANDROID_PRIVATE_NATIVE_PERFORMANCE_HINT_PRIVATE_H