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head/contrib/jemalloc/ChangeLog
| Following are change highlights associated with official releases. Important | Following are change highlights associated with official releases. Important | ||||
| bug fixes are all mentioned, but some internal enhancements are omitted here for | bug fixes are all mentioned, but some internal enhancements are omitted here for | ||||
| brevity. Much more detail can be found in the git revision history: | brevity. Much more detail can be found in the git revision history: | ||||
| https://github.com/jemalloc/jemalloc | https://github.com/jemalloc/jemalloc | ||||
| * 5.1.0 (May 4th, 2018) | * 5.2.1 (August 5, 2019) | ||||
| This release is primarily about Windows. A critical virtual memory leak is | |||||
| resolved on all Windows platforms. The regression was present in all releases | |||||
| since 5.0.0. | |||||
| Bug fixes: | |||||
| - Fix a severe virtual memory leak on Windows. This regression was first | |||||
| released in 5.0.0. (@Ignition, @j0t, @frederik-h, @davidtgoldblatt, | |||||
| @interwq) | |||||
| - Fix size 0 handling in posix_memalign(). This regression was first released | |||||
| in 5.2.0. (@interwq) | |||||
| - Fix the prof_log unit test which may observe unexpected backtraces from | |||||
| compiler optimizations. The test was first added in 5.2.0. (@marxin, | |||||
| @gnzlbg, @interwq) | |||||
| - Fix the declaration of the extent_avail tree. This regression was first | |||||
| released in 5.1.0. (@zoulasc) | |||||
| - Fix an incorrect reference in jeprof. This functionality was first released | |||||
| in 3.0.0. (@prehistoric-penguin) | |||||
| - Fix an assertion on the deallocation fast-path. This regression was first | |||||
| released in 5.2.0. (@yinan1048576) | |||||
| - Fix the TLS_MODEL attribute in headers. This regression was first released | |||||
| in 5.0.0. (@zoulasc, @interwq) | |||||
| Optimizations and refactors: | |||||
| - Implement opt.retain on Windows and enable by default on 64-bit. (@interwq, | |||||
| @davidtgoldblatt) | |||||
| - Optimize away a branch on the operator delete[] path. (@mgrice) | |||||
| - Add format annotation to the format generator function. (@zoulasc) | |||||
| - Refactor and improve the size class header generation. (@yinan1048576) | |||||
| - Remove best fit. (@djwatson) | |||||
| - Avoid blocking on background thread locks for stats. (@oranagra, @interwq) | |||||
| * 5.2.0 (April 2, 2019) | |||||
| This release includes a few notable improvements, which are summarized below: | |||||
| 1) improved fast-path performance from the optimizations by @djwatson; 2) | |||||
| reduced virtual memory fragmentation and metadata usage; and 3) bug fixes on | |||||
| setting the number of background threads. In addition, peak / spike memory | |||||
| usage is improved with certain allocation patterns. As usual, the release and | |||||
| prior dev versions have gone through large-scale production testing. | |||||
| New features: | |||||
| - Implement oversize_threshold, which uses a dedicated arena for allocations | |||||
| crossing the specified threshold to reduce fragmentation. (@interwq) | |||||
| - Add extents usage information to stats. (@tyleretzel) | |||||
| - Log time information for sampled allocations. (@tyleretzel) | |||||
| - Support 0 size in sdallocx. (@djwatson) | |||||
| - Output rate for certain counters in malloc_stats. (@zinoale) | |||||
| - Add configure option --enable-readlinkat, which allows the use of readlinkat | |||||
| over readlink. (@davidtgoldblatt) | |||||
| - Add configure options --{enable,disable}-{static,shared} to allow not | |||||
| building unwanted libraries. (@Ericson2314) | |||||
| - Add configure option --disable-libdl to enable fully static builds. | |||||
| (@interwq) | |||||
| - Add mallctl interfaces: | |||||
| + opt.oversize_threshold (@interwq) | |||||
| + stats.arenas.<i>.extent_avail (@tyleretzel) | |||||
| + stats.arenas.<i>.extents.<j>.n{dirty,muzzy,retained} (@tyleretzel) | |||||
| + stats.arenas.<i>.extents.<j>.{dirty,muzzy,retained}_bytes | |||||
| (@tyleretzel) | |||||
| Portability improvements: | |||||
| - Update MSVC builds. (@maksqwe, @rustyx) | |||||
| - Workaround a compiler optimizer bug on s390x. (@rkmisra) | |||||
| - Make use of pthread_set_name_np(3) on FreeBSD. (@trasz) | |||||
| - Implement malloc_getcpu() to enable percpu_arena for windows. (@santagada) | |||||
| - Link against -pthread instead of -lpthread. (@paravoid) | |||||
| - Make background_thread not dependent on libdl. (@interwq) | |||||
| - Add stringify to fix a linker directive issue on MSVC. (@daverigby) | |||||
| - Detect and fall back when 8-bit atomics are unavailable. (@interwq) | |||||
| - Fall back to the default pthread_create if dlsym(3) fails. (@interwq) | |||||
| Optimizations and refactors: | |||||
| - Refactor the TSD module. (@davidtgoldblatt) | |||||
| - Avoid taking extents_muzzy mutex when muzzy is disabled. (@interwq) | |||||
| - Avoid taking large_mtx for auto arenas on the tcache flush path. (@interwq) | |||||
| - Optimize ixalloc by avoiding a size lookup. (@interwq) | |||||
| - Implement opt.oversize_threshold which uses a dedicated arena for requests | |||||
| crossing the threshold, also eagerly purges the oversize extents. Default | |||||
| the threshold to 8 MiB. (@interwq) | |||||
| - Clean compilation with -Wextra. (@gnzlbg, @jasone) | |||||
| - Refactor the size class module. (@davidtgoldblatt) | |||||
| - Refactor the stats emitter. (@tyleretzel) | |||||
| - Optimize pow2_ceil. (@rkmisra) | |||||
| - Avoid runtime detection of lazy purging on FreeBSD. (@trasz) | |||||
| - Optimize mmap(2) alignment handling on FreeBSD. (@trasz) | |||||
| - Improve error handling for THP state initialization. (@jsteemann) | |||||
| - Rework the malloc() fast path. (@djwatson) | |||||
| - Rework the free() fast path. (@djwatson) | |||||
| - Refactor and optimize the tcache fill / flush paths. (@djwatson) | |||||
| - Optimize sync / lwsync on PowerPC. (@chmeeedalf) | |||||
| - Bypass extent_dalloc() when retain is enabled. (@interwq) | |||||
| - Optimize the locking on large deallocation. (@interwq) | |||||
| - Reduce the number of pages committed from sanity checking in debug build. | |||||
| (@trasz, @interwq) | |||||
| - Deprecate OSSpinLock. (@interwq) | |||||
| - Lower the default number of background threads to 4 (when the feature | |||||
| is enabled). (@interwq) | |||||
| - Optimize the trylock spin wait. (@djwatson) | |||||
| - Use arena index for arena-matching checks. (@interwq) | |||||
| - Avoid forced decay on thread termination when using background threads. | |||||
| (@interwq) | |||||
| - Disable muzzy decay by default. (@djwatson, @interwq) | |||||
| - Only initialize libgcc unwinder when profiling is enabled. (@paravoid, | |||||
| @interwq) | |||||
| Bug fixes (all only relevant to jemalloc 5.x): | |||||
| - Fix background thread index issues with max_background_threads. (@djwatson, | |||||
| @interwq) | |||||
| - Fix stats output for opt.lg_extent_max_active_fit. (@interwq) | |||||
| - Fix opt.prof_prefix initialization. (@davidtgoldblatt) | |||||
| - Properly trigger decay on tcache destroy. (@interwq, @amosbird) | |||||
| - Fix tcache.flush. (@interwq) | |||||
| - Detect whether explicit extent zero out is necessary with huge pages or | |||||
| custom extent hooks, which may change the purge semantics. (@interwq) | |||||
| - Fix a side effect caused by extent_max_active_fit combined with decay-based | |||||
| purging, where freed extents can accumulate and not be reused for an | |||||
| extended period of time. (@interwq, @mpghf) | |||||
| - Fix a missing unlock on extent register error handling. (@zoulasc) | |||||
| Testing: | |||||
| - Simplify the Travis script output. (@gnzlbg) | |||||
| - Update the test scripts for FreeBSD. (@devnexen) | |||||
| - Add unit tests for the producer-consumer pattern. (@interwq) | |||||
| - Add Cirrus-CI config for FreeBSD builds. (@jasone) | |||||
| - Add size-matching sanity checks on tcache flush. (@davidtgoldblatt, | |||||
| @interwq) | |||||
| Incompatible changes: | |||||
| - Remove --with-lg-page-sizes. (@davidtgoldblatt) | |||||
| Documentation: | |||||
| - Attempt to build docs by default, however skip doc building when xsltproc | |||||
| is missing. (@interwq, @cmuellner) | |||||
| * 5.1.0 (May 4, 2018) | |||||
| This release is primarily about fine-tuning, ranging from several new features | This release is primarily about fine-tuning, ranging from several new features | ||||
| to numerous notable performance and portability enhancements. The release and | to numerous notable performance and portability enhancements. The release and | ||||
| prior dev versions have been running in multiple large scale applications for | prior dev versions have been running in multiple large scale applications for | ||||
| months, and the cumulative improvements are substantial in many cases. | months, and the cumulative improvements are substantial in many cases. | ||||
| Given the long and successful production runs, this release is likely a good | Given the long and successful production runs, this release is likely a good | ||||
| candidate for applications to upgrade, from both jemalloc 5.0 and before. For | candidate for applications to upgrade, from both jemalloc 5.0 and before. For | ||||
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