Method for immediately recording object allocation points when Java object memory leak is monitored on Android system

Abstract

The invention provides a method for instantly recording object allocation points when Java object memory leak is monitored on an Android system and belongs to the technical field of computers. The method is based on the idea of a traditional bitmap, object distribution points are compressed and clustered, each object on a Java heap is described with 8-bit data in the compressed bitmap, the first bit is used for identifying whether the objects are accessed or not, and the latter 7 bits are used for recording the colors of the distribution points of the objects; during monitoring, the main GC triggers leakage inference once every N times, and whether the object is a cold object or not is judged according to the compressed bitmap; when it is judged that a certain object leaks, the distribution points and the distribution functions of the same object type in the distribution points with the same color as the object distribution points are output. According to the method, an online lightweight leakage inference mechanism is realized, and distribution point information related to memory leakage can be provided; compared with the prior art, load performance is better during operation.

Description

technical field [0001] The invention belongs to the technical field of computers, and in particular relates to a monitoring method for instantly recording object allocation points when a Java object memory leaks on an Android system. Background technique [0002] In the JAVA virtual machine, the garbage collection mechanism is generally implemented by an algorithm based on reference counting or reachability analysis to recycle unreachable objects. The automatic garbage collection mechanism reduces the errors of improper use of program memory to a certain extent, and because it has a unified memory management mechanism, it improves the efficiency of application memory usage compared with manual allocation, and at the same time reduces the loss due to the automatic recovery mechanism. The problem of memory leak caused by object pointer. However, the automatic garbage collection mechanism cannot completely avoid memory leaks. JAVA objects often have a limited life cycle logica...

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Problems solved by technology

[0004] Aiming at the problem that the existing monitoring tools cannot meet the needs of users to monitor memory leaks in all scenarios, the present invention proposes a method for instantly recording object allocation points when monitoring Java object memory leaks on an Android system, using a lightweight The monitoring mechanism is used to judge the "hot and cold" status of objects in ART. By monitoring the activity behavior of objects during runtime, online maintenance and judgment of implicit memory leaks of objects can be found, so as to find the allocation point of "cold" objects

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