cf1ab852d1
Motivation: The "used memory" is the amount of memory that a pooled allocator has currently allocated and committed for itself. Ths is useful for managing resource usage of the pool versus the available system resources. However, it is not useful for managing resources of the currently circulating buffer instances versus the pool. The pinned memory is the memory currently in use by buffers in circulation, plus memory held in the thread-local caches. Modification: Add pinned memory accounting to PoolChunk. We cannot just use the existing freeBytes because that field is only updated when pool subpages are retired, and a chunk will never retire its last subpage instance. The accounting statistics are available on the PooledByteBufAllocator only, since the metrics interfaces cannot be changed due to backwards compatibility. Result: It is now possible to get a fairly accurate (with slight over-counting due to the thread-local caches) picture of how much memory is held up in buffer instances at any given moment. Fixes #11637
Netty Project
Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers & clients.
Links
How to build
For the detailed information about building and developing Netty, please visit the developer guide. This page only gives very basic information.
You require the following to build Netty:
- Latest stable OpenJDK 8
- Latest stable Apache Maven
- If you are on Linux, you need additional development packages installed on your system, because you'll build the native transport.
Note that this is build-time requirement. JDK 5 (for 3.x) or 6 (for 4.0+ / 4.1+) is enough to run your Netty-based application.
Branches to look
Development of all versions takes place in each branch whose name is identical to <majorVersion>.<minorVersion>. For example, the development of 3.9 and 4.1 resides in the branch '3.9' and the branch '4.1' respectively.
Usage with JDK 9+
Netty can be used in modular JDK9+ applications as a collection of automatic modules. The module names follow the reverse-DNS style, and are derived from subproject names rather than root packages due to historical reasons. They are listed below:
io.netty.allio.netty.bufferio.netty.codecio.netty.codec.dnsio.netty.codec.haproxyio.netty.codec.httpio.netty.codec.http2io.netty.codec.memcacheio.netty.codec.mqttio.netty.codec.redisio.netty.codec.smtpio.netty.codec.socksio.netty.codec.stompio.netty.codec.xmlio.netty.commonio.netty.handlerio.netty.handler.proxyio.netty.resolverio.netty.resolver.dnsio.netty.transportio.netty.transport.epoll(nativeomitted - reserved keyword in Java)io.netty.transport.kqueue(nativeomitted - reserved keyword in Java)io.netty.transport.unix.common(nativeomitted - reserved keyword in Java)io.netty.transport.rxtxio.netty.transport.sctpio.netty.transport.udt
Automatic modules do not provide any means to declare dependencies, so you need to list each used module separately
in your module-info file.