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This gives more accurate attribution of bytes and counts to stack traces, without introducing backwards incompatibilities in heap-profile parsing tools. We track the ideal reported (to the end user) number of bytes more carefully inside core jemalloc. When dumping heap profiles, insteading of outputting our counts directly, we output counts that will cause parsing tools to give a result close to the value we want. We retain the old version as an opt setting, to let users who are tracking values on a per-component basis to keep their metrics stable until they decide to switch.
jemalloc is a general purpose malloc(3) implementation that emphasizes fragmentation avoidance and scalable concurrency support. jemalloc first came into use as the FreeBSD libc allocator in 2005, and since then it has found its way into numerous applications that rely on its predictable behavior. In 2010 jemalloc development efforts broadened to include developer support features such as heap profiling and extensive monitoring/tuning hooks. Modern jemalloc releases continue to be integrated back into FreeBSD, and therefore versatility remains critical. Ongoing development efforts trend toward making jemalloc among the best allocators for a broad range of demanding applications, and eliminating/mitigating weaknesses that have practical repercussions for real world applications. The COPYING file contains copyright and licensing information. The INSTALL file contains information on how to configure, build, and install jemalloc. The ChangeLog file contains a brief summary of changes for each release. URL: http://jemalloc.net/