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jemalloc4.2.0发布，内存分配管理_html/css

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jemalloc 4.2.0 发布了。

新特性：

Add the arena..reset mallctl, which makes it possible to discard all of an arena's allocations in a single operation. ( @jasone)

Add the stats.retained and stats.arenas..retained statistics. ( @jasone)

Add the --with-version configure option. ( @jasone)

Support --with-lg-page values larger than actual page size. ( @jasone)

优化：

Use pairing heaps rather than red-black trees for various hot data structures. ( @djwatson, @jasone)

Streamline fast paths of rtree operations. ( @jasone)

Optimize the fast paths of calloc() and [m,d,sd]allocx(). ( @jasone)

Decommit unused virtual memory if the OS does not overcommit. ( @jasone)

Specify MAP_NORESERVE on Linux if [heuristic] overcommit is active, in order to avoid unfortunate interactions during fork(2). ( @jasone)

Bug 修复:

Fix chunk accounting related to triggering gdump profiles. ( @jasone)

Link against librt for clock_gettime(2) if glibc < 2.17. ( @jasone)

Scale leak report summary according to sampling probability. ( @jasone)

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