337f5bbb8e
Now that we are going to use buffer pooling by default, it is obvious that a user will forget to call .free() and report memory leak. In this case, we should have a tool to determine if it is a bug in our allocator implementation or in the user's code. This pull request adds a system property flag called 'io.netty.resourceLeakDetection'. If set, when a user forgets to call .free(), the ResourceLeakDetector will detect it and log a message with detailed stack trace to tell where the leaked buffer has been allocated. Because obtaining stack trace is an expensive operation, I used sampling technique. Allocation is recorded only for every 113th allocation. I chose 113 because it's a prime number. In production, a user might not want to enable this option due to potential performance impact. If a user does not specify the '-Dio.netty.resourceLeakDetection' option leak detection is disabled. Even if the leak detection is enabled, the overhead should be less than 5% because only ~1% of allocations are monitored. I also replaced SharedResourceMisuseDetector with ResourceLeakDetector. |
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