jemalloc 5.1.0 released, memory allocation management

  

jemalloc 5.1.0 has been released, jemalloc is a generic malloc(3) implementation that emphasizes segmentation avoidance and scalable concurrency support. jemalloc was first used as the FreeBSD libc allocator in 2005, and in 2010, jemalloc's capabilities were extended to things like heap analysis and monitoring/tuning. A modern version of jemalloc is still integrated in FreeBSD.

This version has been improved in terms of features, performance, portability, etc. It is recommended that users of version 5.0.x and earlier upgrade.

• Implement transparent huge page support for internal metadata.

• Add opt.thp to allow enabling / disabling transparent huge pages for all mappings. 

• Add maximum background thread count option.

• Allow prof_active to control opt.lg_prof_interval and prof.gdump. 

• Allow arena index lookup based on allocation addresses via mallctl. 

• Allow disabling initial-exec TLS model.

• Add opt.lg_extent_max_active_fit to set the max ratio between the size of the active extent selected (to split off from) and the size of the requested allocation. 

• Add retain_grow_limit to set the max size when growing virtual address space. 

• Add mallctl interfaces:

• arena.<i>.retain_grow_limit 

• arenas.lookup 

• max_background_threads 

• opt.lg_extent_max_active_fit

• opt.max_background_threads

• opt.metadata_thp 

• opt.thp 

• stats.metadata_thp 

For the full update content and download address, please refer to the release list .