jemalloc 4.1.0 发布，增强了可移植性

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　　jemalloc 4.1.0 发布了新的版本，增强了可移植性，性能也得以大大的优化。
　　jemalloc 4.1.0新特性：

　　* Implement decay-based unused dirty page purging, a major optimization with mallctl API impact. This is an>　　opt.purge
　　opt.decay_time
　　arena..decay
　　arena..decay_time
　　arenas.decay_time
　　stats.arenas..decay_time
　　(@jasone, @cevans87)

　　* Add --with-malloc-conf, which makes it possible to embed a default options string during configuration. This was motivated by the desire to specify --with-malloc-conf=purge:decay , since the default must remain purge:ratio until the 5.0.0>　　* Add MS Visual Studio 2015 support. (@rustyx, @yuslepukhin)

　　* Make *allocx()>　　* jeprof:
　　Add raw heap profile support. (@jasone)
　　Add --retain and --exclude for backtrace symbol filtering. (@jasone)
　　关于该版本的更多详情，可参见 https://github.com/jemalloc/jemalloc/releases/tag/4.1.0
　　下载地址：https://github.com/jemalloc/jemalloc/releases/download/4.1.0/jemalloc-4.1.0.tar.bz2