Update ChangeLog for 5.1.0.
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Qi Wang
Qi Wang
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ChangeLog
117
ChangeLog
@ -4,6 +4,123 @@ brevity. Much more detail can be found in the git revision history:
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https://github.com/jemalloc/jemalloc
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https://github.com/jemalloc/jemalloc
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* 5.1.0 (May 4th, 2018)
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This release is primarily about fine-tuning, ranging from several new features
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to numerous notable performance and portability enhancements. The release and
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prior dev versions have been running in multiple large scale applications for
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months, and the cumulative improvements are substantial in many cases.
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Given the long and successful production runs, this release is likely a good
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candidate for applications to upgrade, from both jemalloc 5.0 and before. For
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performance-critical applications, the newly added TUNING.md provides
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guidelines on jemalloc tuning.
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New features:
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- Implement transparent huge page support for internal metadata. (@interwq)
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- Add opt.thp to allow enabling / disabling transparent huge pages for all
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mappings. (@interwq)
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- Add maximum background thread count option. (@djwatson)
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- Allow prof_active to control opt.lg_prof_interval and prof.gdump.
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(@interwq)
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- Allow arena index lookup based on allocation addresses via mallctl.
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(@lionkov)
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- Allow disabling initial-exec TLS model. (@davidtgoldblatt, @KenMacD)
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- Add opt.lg_extent_max_active_fit to set the max ratio between the size of
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the active extent selected (to split off from) and the size of the requested
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allocation. (@interwq, @davidtgoldblatt)
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- Add retain_grow_limit to set the max size when growing virtual address
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space. (@interwq)
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- Add mallctl interfaces:
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+ arena.<i>.retain_grow_limit (@interwq)
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+ arenas.lookup (@lionkov)
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+ max_background_threads (@djwatson)
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+ opt.lg_extent_max_active_fit (@interwq)
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+ opt.max_background_threads (@djwatson)
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+ opt.metadata_thp (@interwq)
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+ opt.thp (@interwq)
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+ stats.metadata_thp (@interwq)
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Portability improvements:
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- Support GNU/kFreeBSD configuration. (@paravoid)
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- Support m68k, nios2 and SH3 architectures. (@paravoid)
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- Fall back to FD_CLOEXEC when O_CLOEXEC is unavailable. (@zonyitoo)
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- Fix symbol listing for cross-compiling. (@tamird)
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- Fix high bits computation on ARM. (@davidtgoldblatt, @paravoid)
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- Disable the CPU_SPINWAIT macro for Power. (@davidtgoldblatt, @marxin)
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- Fix MSVC 2015 & 2017 builds. (@rustyx)
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- Improve RISC-V support. (@EdSchouten)
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- Set name mangling script in strict mode. (@nicolov)
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- Avoid MADV_HUGEPAGE on ARM. (@marxin)
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- Modify configure to determine return value of strerror_r.
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(@davidtgoldblatt, @cferris1000)
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- Make sure CXXFLAGS is tested with CPP compiler. (@nehaljwani)
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- Fix 32-bit build on MSVC. (@rustyx)
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- Fix external symbol on MSVC. (@maksqwe)
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- Avoid a printf format specifier warning. (@jasone)
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- Add configure option --disable-initial-exec-tls which can allow jemalloc to
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be dynamically loaded after program startup. (@davidtgoldblatt, @KenMacD)
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- AArch64: Add ILP32 support. (@cmuellner)
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- Add --with-lg-vaddr configure option to support cross compiling.
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(@cmuellner, @davidtgoldblatt)
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Optimizations and refactors:
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- Improve active extent fit with extent_max_active_fit. This considerably
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reduces fragmentation over time and improves virtual memory and metadata
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usage. (@davidtgoldblatt, @interwq)
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- Eagerly coalesce large extents to reduce fragmentation. (@interwq)
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- sdallocx: only read size info when page aligned (i.e. possibly sampled),
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which speeds up the sized deallocation path significantly. (@interwq)
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- Avoid attempting new mappings for in place expansion with retain, since
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it rarely succeeds in practice and causes high overhead. (@interwq)
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- Refactor OOM handling in newImpl. (@wqfish)
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- Add internal fine-grained logging functionality for debugging use.
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(@davidtgoldblatt)
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- Refactor arena / tcache interactions. (@davidtgoldblatt)
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- Refactor extent management with dumpable flag. (@davidtgoldblatt)
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- Add runtime detection of lazy purging. (@interwq)
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- Use pairing heap instead of red-black tree for extents_avail. (@djwatson)
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- Use sysctl on startup in FreeBSD. (@trasz)
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- Use thread local prng state instead of atomic. (@djwatson)
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- Make decay to always purge one more extent than before, because in
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practice large extents are usually the ones that cross the decay threshold.
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Purging the additional extent helps save memory as well as reduce VM
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fragmentation. (@interwq)
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- Fast division by dynamic values. (@davidtgoldblatt)
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- Improve the fit for aligned allocation. (@interwq, @edwinsmith)
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- Refactor extent_t bitpacking. (@rkmisra)
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- Optimize the generated assembly for ticker operations. (@davidtgoldblatt)
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- Convert stats printing to use a structured text emitter. (@davidtgoldblatt)
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- Remove preserve_lru feature for extents management. (@djwatson)
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- Consolidate two memory loads into one on the fast deallocation path.
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(@davidtgoldblatt, @interwq)
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Bug fixes (most of the issues are only relevant to jemalloc 5.0):
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- Fix deadlock with multithreaded fork in OS X. (@davidtgoldblatt)
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- Validate returned file descriptor before use. (@zonyitoo)
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- Fix a few background thread initialization and shutdown issues. (@interwq)
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- Fix an extent coalesce + decay race by taking both coalescing extents off
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the LRU list. (@interwq)
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- Fix potentially unbound increase during decay, caused by one thread keep
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stashing memory to purge while other threads generating new pages. The
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number of pages to purge is checked to prevent this. (@interwq)
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- Fix a FreeBSD bootstrap assertion. (@strejda, @interwq)
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- Handle 32 bit mutex counters. (@rkmisra)
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- Fix a indexing bug when creating background threads. (@davidtgoldblatt,
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@binliu19)
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- Fix arguments passed to extent_init. (@yuleniwo, @interwq)
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- Fix addresses used for ordering mutexes. (@rkmisra)
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- Fix abort_conf processing during bootstrap. (@interwq)
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- Fix include path order for out-of-tree builds. (@cmuellner)
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Incompatible changes:
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- Remove --disable-thp. (@interwq)
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- Remove mallctl interfaces:
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+ config.thp (@interwq)
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Documentation:
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- Add TUNING.md. (@interwq, @davidtgoldblatt, @djwatson)
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* 5.0.1 (July 1, 2017)
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* 5.0.1 (July 1, 2017)
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This bugfix release fixes several issues, most of which are obscure enough
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This bugfix release fixes several issues, most of which are obscure enough
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