1266 lines
60 KiB
Plaintext
1266 lines
60 KiB
Plaintext
Following are change highlights associated with official releases. Important
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bug fixes are all mentioned, but some internal enhancements are omitted here for
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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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* 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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that typical applications are not impacted.
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Bug fixes:
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- Update decay->nunpurged before purging, in order to avoid potential update
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races and subsequent incorrect purging volume. (@interwq)
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- Only abort on dlsym(3) error if the failure impacts an enabled feature (lazy
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locking and/or background threads). This mitigates an initialization
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failure bug for which we still do not have a clear reproduction test case.
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(@interwq)
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- Modify tsd management so that it neither crashes nor leaks if a thread's
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only allocation activity is to call free() after TLS destructors have been
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executed. This behavior was observed when operating with GNU libc, and is
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unlikely to be an issue with other libc implementations. (@interwq)
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- Mask signals during background thread creation. This prevents signals from
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being inadvertently delivered to background threads. (@jasone,
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@davidtgoldblatt, @interwq)
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- Avoid inactivity checks within background threads, in order to prevent
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recursive mutex acquisition. (@interwq)
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- Fix extent_grow_retained() to use the specified hooks when the
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arena.<i>.extent_hooks mallctl is used to override the default hooks.
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(@interwq)
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- Add missing reentrancy support for custom extent hooks which allocate.
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(@interwq)
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- Post-fork(2), re-initialize the list of tcaches associated with each arena
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to contain no tcaches except the forking thread's. (@interwq)
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- Add missing post-fork(2) mutex reinitialization for extent_grow_mtx. This
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fixes potential deadlocks after fork(2). (@interwq)
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- Enforce minimum autoconf version (currently 2.68), since 2.63 is known to
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generate corrupt configure scripts. (@jasone)
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- Ensure that the configured page size (--with-lg-page) is no larger than the
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configured huge page size (--with-lg-hugepage). (@jasone)
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* 5.0.0 (June 13, 2017)
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Unlike all previous jemalloc releases, this release does not use naturally
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aligned "chunks" for virtual memory management, and instead uses page-aligned
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"extents". This change has few externally visible effects, but the internal
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impacts are... extensive. Many other internal changes combine to make this
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the most cohesively designed version of jemalloc so far, with ample
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opportunity for further enhancements.
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Continuous integration is now an integral aspect of development thanks to the
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efforts of @davidtgoldblatt, and the dev branch tends to remain reasonably
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stable on the tested platforms (Linux, FreeBSD, macOS, and Windows). As a
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side effect the official release frequency may decrease over time.
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New features:
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- Implement optional per-CPU arena support; threads choose which arena to use
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based on current CPU rather than on fixed thread-->arena associations.
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(@interwq)
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- Implement two-phase decay of unused dirty pages. Pages transition from
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dirty-->muzzy-->clean, where the first phase transition relies on
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madvise(... MADV_FREE) semantics, and the second phase transition discards
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pages such that they are replaced with demand-zeroed pages on next access.
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(@jasone)
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- Increase decay time resolution from seconds to milliseconds. (@jasone)
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- Implement opt-in per CPU background threads, and use them for asynchronous
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decay-driven unused dirty page purging. (@interwq)
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- Add mutex profiling, which collects a variety of statistics useful for
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diagnosing overhead/contention issues. (@interwq)
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- Add C++ new/delete operator bindings. (@djwatson)
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- Support manually created arena destruction, such that all data and metadata
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are discarded. Add MALLCTL_ARENAS_DESTROYED for accessing merged stats
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associated with destroyed arenas. (@jasone)
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- Add MALLCTL_ARENAS_ALL as a fixed index for use in accessing
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merged/destroyed arena statistics via mallctl. (@jasone)
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- Add opt.abort_conf to optionally abort if invalid configuration options are
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detected during initialization. (@interwq)
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- Add opt.stats_print_opts, so that e.g. JSON output can be selected for the
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stats dumped during exit if opt.stats_print is true. (@jasone)
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- Add --with-version=VERSION for use when embedding jemalloc into another
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project's git repository. (@jasone)
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- Add --disable-thp to support cross compiling. (@jasone)
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- Add --with-lg-hugepage to support cross compiling. (@jasone)
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- Add mallctl interfaces (various authors):
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+ background_thread
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+ opt.abort_conf
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+ opt.retain
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+ opt.percpu_arena
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+ opt.background_thread
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+ opt.{dirty,muzzy}_decay_ms
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+ opt.stats_print_opts
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+ arena.<i>.initialized
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+ arena.<i>.destroy
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+ arena.<i>.{dirty,muzzy}_decay_ms
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+ arena.<i>.extent_hooks
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+ arenas.{dirty,muzzy}_decay_ms
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+ arenas.bin.<i>.slab_size
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+ arenas.nlextents
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+ arenas.lextent.<i>.size
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+ arenas.create
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+ stats.background_thread.{num_threads,num_runs,run_interval}
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+ stats.mutexes.{ctl,background_thread,prof,reset}.
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{num_ops,num_spin_acq,num_wait,max_wait_time,total_wait_time,max_num_thds,
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num_owner_switch}
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+ stats.arenas.<i>.{dirty,muzzy}_decay_ms
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+ stats.arenas.<i>.uptime
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+ stats.arenas.<i>.{pmuzzy,base,internal,resident}
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+ stats.arenas.<i>.{dirty,muzzy}_{npurge,nmadvise,purged}
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+ stats.arenas.<i>.bins.<j>.{nslabs,reslabs,curslabs}
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+ stats.arenas.<i>.bins.<j>.mutex.
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{num_ops,num_spin_acq,num_wait,max_wait_time,total_wait_time,max_num_thds,
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num_owner_switch}
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+ stats.arenas.<i>.lextents.<j>.{nmalloc,ndalloc,nrequests,curlextents}
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+ stats.arenas.i.mutexes.{large,extent_avail,extents_dirty,extents_muzzy,
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extents_retained,decay_dirty,decay_muzzy,base,tcache_list}.
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{num_ops,num_spin_acq,num_wait,max_wait_time,total_wait_time,max_num_thds,
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num_owner_switch}
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Portability improvements:
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- Improve reentrant allocation support, such that deadlock is less likely if
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e.g. a system library call in turn allocates memory. (@davidtgoldblatt,
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@interwq)
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- Support static linking of jemalloc with glibc. (@djwatson)
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Optimizations and refactors:
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- Organize virtual memory as "extents" of virtual memory pages, rather than as
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naturally aligned "chunks", and store all metadata in arbitrarily distant
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locations. This reduces virtual memory external fragmentation, and will
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interact better with huge pages (not yet explicitly supported). (@jasone)
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- Fold large and huge size classes together; only small and large size classes
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remain. (@jasone)
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- Unify the allocation paths, and merge most fast-path branching decisions.
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(@davidtgoldblatt, @interwq)
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- Embed per thread automatic tcache into thread-specific data, which reduces
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conditional branches and dereferences. Also reorganize tcache to increase
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fast-path data locality. (@interwq)
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- Rewrite atomics to closely model the C11 API, convert various
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synchronization from mutex-based to atomic, and use the explicit memory
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ordering control to resolve various hypothetical races without increasing
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synchronization overhead. (@davidtgoldblatt)
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- Extensively optimize rtree via various methods:
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+ Add multiple layers of rtree lookup caching, since rtree lookups are now
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part of fast-path deallocation. (@interwq)
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+ Determine rtree layout at compile time. (@jasone)
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+ Make the tree shallower for common configurations. (@jasone)
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+ Embed the root node in the top-level rtree data structure, thus avoiding
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one level of indirection. (@jasone)
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+ Further specialize leaf elements as compared to internal node elements,
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and directly embed extent metadata needed for fast-path deallocation.
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(@jasone)
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+ Ignore leading always-zero address bits (architecture-specific).
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(@jasone)
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- Reorganize headers (ongoing work) to make them hermetic, and disentangle
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various module dependencies. (@davidtgoldblatt)
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- Convert various internal data structures such as size class metadata from
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boot-time-initialized to compile-time-initialized. Propagate resulting data
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structure simplifications, such as making arena metadata fixed-size.
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(@jasone)
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- Simplify size class lookups when constrained to size classes that are
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multiples of the page size. This speeds lookups, but the primary benefit is
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complexity reduction in code that was the source of numerous regressions.
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(@jasone)
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- Lock individual extents when possible for localized extent operations,
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rather than relying on a top-level arena lock. (@davidtgoldblatt, @jasone)
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- Use first fit layout policy instead of best fit, in order to improve
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packing. (@jasone)
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- If munmap(2) is not in use, use an exponential series to grow each arena's
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virtual memory, so that the number of disjoint virtual memory mappings
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remains low. (@jasone)
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- Implement per arena base allocators, so that arenas never share any virtual
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memory pages. (@jasone)
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- Automatically generate private symbol name mangling macros. (@jasone)
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Incompatible changes:
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- Replace chunk hooks with an expanded/normalized set of extent hooks.
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(@jasone)
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- Remove ratio-based purging. (@jasone)
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- Remove --disable-tcache. (@jasone)
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- Remove --disable-tls. (@jasone)
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- Remove --enable-ivsalloc. (@jasone)
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- Remove --with-lg-size-class-group. (@jasone)
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- Remove --with-lg-tiny-min. (@jasone)
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- Remove --disable-cc-silence. (@jasone)
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- Remove --enable-code-coverage. (@jasone)
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- Remove --disable-munmap (replaced by opt.retain). (@jasone)
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- Remove Valgrind support. (@jasone)
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- Remove quarantine support. (@jasone)
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- Remove redzone support. (@jasone)
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- Remove mallctl interfaces (various authors):
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+ config.munmap
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+ config.tcache
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+ config.tls
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+ config.valgrind
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+ opt.lg_chunk
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+ opt.purge
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+ opt.lg_dirty_mult
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+ opt.decay_time
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+ opt.quarantine
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+ opt.redzone
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+ opt.thp
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+ arena.<i>.lg_dirty_mult
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+ arena.<i>.decay_time
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+ arena.<i>.chunk_hooks
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+ arenas.initialized
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+ arenas.lg_dirty_mult
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+ arenas.decay_time
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+ arenas.bin.<i>.run_size
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+ arenas.nlruns
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+ arenas.lrun.<i>.size
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+ arenas.nhchunks
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+ arenas.hchunk.<i>.size
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+ arenas.extend
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+ stats.cactive
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+ stats.arenas.<i>.lg_dirty_mult
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+ stats.arenas.<i>.decay_time
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+ stats.arenas.<i>.metadata.{mapped,allocated}
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+ stats.arenas.<i>.{npurge,nmadvise,purged}
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+ stats.arenas.<i>.huge.{allocated,nmalloc,ndalloc,nrequests}
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+ stats.arenas.<i>.bins.<j>.{nruns,reruns,curruns}
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+ stats.arenas.<i>.lruns.<j>.{nmalloc,ndalloc,nrequests,curruns}
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+ stats.arenas.<i>.hchunks.<j>.{nmalloc,ndalloc,nrequests,curhchunks}
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Bug fixes:
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- Improve interval-based profile dump triggering to dump only one profile when
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a single allocation's size exceeds the interval. (@jasone)
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- Use prefixed function names (as controlled by --with-jemalloc-prefix) when
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pruning backtrace frames in jeprof. (@jasone)
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* 4.5.0 (February 28, 2017)
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This is the first release to benefit from much broader continuous integration
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testing, thanks to @davidtgoldblatt. Had we had this testing infrastructure
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in place for prior releases, it would have caught all of the most serious
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regressions fixed by this release.
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New features:
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- Add --disable-thp and the opt.thp mallctl to provide opt-out mechanisms for
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transparent huge page integration. (@jasone)
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- Update zone allocator integration to work with macOS 10.12. (@glandium)
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- Restructure *CFLAGS configuration, so that CFLAGS behaves typically, and
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EXTRA_CFLAGS provides a way to specify e.g. -Werror during building, but not
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during configuration. (@jasone, @ronawho)
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Bug fixes:
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- Fix DSS (sbrk(2)-based) allocation. This regression was first released in
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4.3.0. (@jasone)
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- Handle race in per size class utilization computation. This functionality
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was first released in 4.0.0. (@interwq)
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- Fix lock order reversal during gdump. (@jasone)
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- Fix/refactor tcache synchronization. This regression was first released in
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4.0.0. (@jasone)
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- Fix various JSON-formatted malloc_stats_print() bugs. This functionality
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was first released in 4.3.0. (@jasone)
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- Fix huge-aligned allocation. This regression was first released in 4.4.0.
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(@jasone)
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- When transparent huge page integration is enabled, detect what state pages
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start in according to the kernel's current operating mode, and only convert
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arena chunks to non-huge during purging if that is not their initial state.
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This functionality was first released in 4.4.0. (@jasone)
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- Fix lg_chunk clamping for the --enable-cache-oblivious --disable-fill case.
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This regression was first released in 4.0.0. (@jasone, @428desmo)
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- Properly detect sparc64 when building for Linux. (@glaubitz)
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* 4.4.0 (December 3, 2016)
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New features:
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- Add configure support for *-*-linux-android. (@cferris1000, @jasone)
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- Add the --disable-syscall configure option, for use on systems that place
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security-motivated limitations on syscall(2). (@jasone)
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- Add support for Debian GNU/kFreeBSD. (@thesam)
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Optimizations:
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- Add extent serial numbers and use them where appropriate as a sort key that
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is higher priority than address, so that the allocation policy prefers older
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extents. This tends to improve locality (decrease fragmentation) when
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memory grows downward. (@jasone)
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- Refactor madvise(2) configuration so that MADV_FREE is detected and utilized
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on Linux 4.5 and newer. (@jasone)
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- Mark partially purged arena chunks as non-huge-page. This improves
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interaction with Linux's transparent huge page functionality. (@jasone)
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Bug fixes:
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- Fix size class computations for edge conditions involving extremely large
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allocations. This regression was first released in 4.0.0. (@jasone,
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@ingvarha)
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- Remove overly restrictive assertions related to the cactive statistic. This
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regression was first released in 4.1.0. (@jasone)
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- Implement a more reliable detection scheme for os_unfair_lock on macOS.
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(@jszakmeister)
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* 4.3.1 (November 7, 2016)
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Bug fixes:
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- Fix a severe virtual memory leak. This regression was first released in
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4.3.0. (@interwq, @jasone)
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- Refactor atomic and prng APIs to restore support for 32-bit platforms that
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use pre-C11 toolchains, e.g. FreeBSD's mips. (@jasone)
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* 4.3.0 (November 4, 2016)
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This is the first release that passes the test suite for multiple Windows
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configurations, thanks in large part to @glandium setting up continuous
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integration via AppVeyor (and Travis CI for Linux and OS X).
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New features:
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- Add "J" (JSON) support to malloc_stats_print(). (@jasone)
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- Add Cray compiler support. (@ronawho)
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Optimizations:
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- Add/use adaptive spinning for bootstrapping and radix tree node
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initialization. (@jasone)
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Bug fixes:
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- Fix large allocation to search starting in the optimal size class heap,
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which can substantially reduce virtual memory churn and fragmentation. This
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regression was first released in 4.0.0. (@mjp41, @jasone)
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- Fix stats.arenas.<i>.nthreads accounting. (@interwq)
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- Fix and simplify decay-based purging. (@jasone)
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- Make DSS (sbrk(2)-related) operations lockless, which resolves potential
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deadlocks during thread exit. (@jasone)
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- Fix over-sized allocation of radix tree leaf nodes. (@mjp41, @ogaun,
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@jasone)
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- Fix over-sized allocation of arena_t (plus associated stats) data
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structures. (@jasone, @interwq)
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- Fix EXTRA_CFLAGS to not affect configuration. (@jasone)
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- Fix a Valgrind integration bug. (@ronawho)
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- Disallow 0x5a junk filling when running in Valgrind. (@jasone)
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- Fix a file descriptor leak on Linux. This regression was first released in
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4.2.0. (@vsarunas, @jasone)
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- Fix static linking of jemalloc with glibc. (@djwatson)
|
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- Use syscall(2) rather than {open,read,close}(2) during boot on Linux. This
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works around other libraries' system call wrappers performing reentrant
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allocation. (@kspinka, @Whissi, @jasone)
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- Fix OS X default zone replacement to work with OS X 10.12. (@glandium,
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@jasone)
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- Fix cached memory management to avoid needless commit/decommit operations
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during purging, which resolves permanent virtual memory map fragmentation
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issues on Windows. (@mjp41, @jasone)
|
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- Fix TSD fetches to avoid (recursive) allocation. This is relevant to
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non-TLS and Windows configurations. (@jasone)
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- Fix malloc_conf overriding to work on Windows. (@jasone)
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- Forcibly disable lazy-lock on Windows (was forcibly *enabled*). (@jasone)
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* 4.2.1 (June 8, 2016)
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Bug fixes:
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- Fix bootstrapping issues for configurations that require allocation during
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tsd initialization (e.g. --disable-tls). (@cferris1000, @jasone)
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- Fix gettimeofday() version of nstime_update(). (@ronawho)
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- Fix Valgrind regressions in calloc() and chunk_alloc_wrapper(). (@ronawho)
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- Fix potential VM map fragmentation regression. (@jasone)
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- Fix opt_zero-triggered in-place huge reallocation zeroing. (@jasone)
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- Fix heap profiling context leaks in reallocation edge cases. (@jasone)
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* 4.2.0 (May 12, 2016)
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New features:
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- Add the arena.<i>.reset mallctl, which makes it possible to discard all of
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an arena's allocations in a single operation. (@jasone)
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- Add the stats.retained and stats.arenas.<i>.retained statistics. (@jasone)
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- Add the --with-version configure option. (@jasone)
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- Support --with-lg-page values larger than actual page size. (@jasone)
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Optimizations:
|
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- Use pairing heaps rather than red-black trees for various hot data
|
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structures. (@djwatson, @jasone)
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- Streamline fast paths of rtree operations. (@jasone)
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- Optimize the fast paths of calloc() and [m,d,sd]allocx(). (@jasone)
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- Decommit unused virtual memory if the OS does not overcommit. (@jasone)
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- Specify MAP_NORESERVE on Linux if [heuristic] overcommit is active, in order
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to avoid unfortunate interactions during fork(2). (@jasone)
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Bug fixes:
|
|
- Fix chunk accounting related to triggering gdump profiles. (@jasone)
|
|
- Link against librt for clock_gettime(2) if glibc < 2.17. (@jasone)
|
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- Scale leak report summary according to sampling probability. (@jasone)
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* 4.1.1 (May 3, 2016)
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This bugfix release resolves a variety of mostly minor issues, though the
|
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bitmap fix is critical for 64-bit Windows.
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Bug fixes:
|
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- Fix the linear scan version of bitmap_sfu() to shift by the proper amount
|
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even when sizeof(long) is not the same as sizeof(void *), as on 64-bit
|
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Windows. (@jasone)
|
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- Fix hashing functions to avoid unaligned memory accesses (and resulting
|
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crashes). This is relevant at least to some ARM-based platforms.
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(@rkmisra)
|
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- Fix fork()-related lock rank ordering reversals. These reversals were
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unlikely to cause deadlocks in practice except when heap profiling was
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enabled and active. (@jasone)
|
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- Fix various chunk leaks in OOM code paths. (@jasone)
|
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- Fix malloc_stats_print() to print opt.narenas correctly. (@jasone)
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- Fix MSVC-specific build/test issues. (@rustyx, @yuslepukhin)
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- Fix a variety of test failures that were due to test fragility rather than
|
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core bugs. (@jasone)
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* 4.1.0 (February 28, 2016)
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This release is primarily about optimizations, but it also incorporates a lot
|
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of portability-motivated refactoring and enhancements. Many people worked on
|
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this release, to an extent that even with the omission here of minor changes
|
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(see git revision history), and of the people who reported and diagnosed
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|
issues, so much of the work was contributed that starting with this release,
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|
changes are annotated with author credits to help reflect the collaborative
|
|
effort involved.
|
|
|
|
New features:
|
|
- Implement decay-based unused dirty page purging, a major optimization with
|
|
mallctl API impact. This is an alternative to the existing ratio-based
|
|
unused dirty page purging, and is intended to eventually become the sole
|
|
purging mechanism. New mallctls:
|
|
+ opt.purge
|
|
+ opt.decay_time
|
|
+ arena.<i>.decay
|
|
+ arena.<i>.decay_time
|
|
+ arenas.decay_time
|
|
+ stats.arenas.<i>.decay_time
|
|
(@jasone, @cevans87)
|
|
- Add --with-malloc-conf, which makes it possible to embed a default
|
|
options string during configuration. This was motivated by the desire to
|
|
specify --with-malloc-conf=purge:decay , since the default must remain
|
|
purge:ratio until the 5.0.0 release. (@jasone)
|
|
- Add MS Visual Studio 2015 support. (@rustyx, @yuslepukhin)
|
|
- Make *allocx() size class overflow behavior defined. The maximum
|
|
size class is now less than PTRDIFF_MAX to protect applications against
|
|
numerical overflow, and all allocation functions are guaranteed to indicate
|
|
errors rather than potentially crashing if the request size exceeds the
|
|
maximum size class. (@jasone)
|
|
- jeprof:
|
|
+ Add raw heap profile support. (@jasone)
|
|
+ Add --retain and --exclude for backtrace symbol filtering. (@jasone)
|
|
|
|
Optimizations:
|
|
- Optimize the fast path to combine various bootstrapping and configuration
|
|
checks and execute more streamlined code in the common case. (@interwq)
|
|
- Use linear scan for small bitmaps (used for small object tracking). In
|
|
addition to speeding up bitmap operations on 64-bit systems, this reduces
|
|
allocator metadata overhead by approximately 0.2%. (@djwatson)
|
|
- Separate arena_avail trees, which substantially speeds up run tree
|
|
operations. (@djwatson)
|
|
- Use memoization (boot-time-computed table) for run quantization. Separate
|
|
arena_avail trees reduced the importance of this optimization. (@jasone)
|
|
- Attempt mmap-based in-place huge reallocation. This can dramatically speed
|
|
up incremental huge reallocation. (@jasone)
|
|
|
|
Incompatible changes:
|
|
- Make opt.narenas unsigned rather than size_t. (@jasone)
|
|
|
|
Bug fixes:
|
|
- Fix stats.cactive accounting regression. (@rustyx, @jasone)
|
|
- Handle unaligned keys in hash(). This caused problems for some ARM systems.
|
|
(@jasone, @cferris1000)
|
|
- Refactor arenas array. In addition to fixing a fork-related deadlock, this
|
|
makes arena lookups faster and simpler. (@jasone)
|
|
- Move retained memory allocation out of the default chunk allocation
|
|
function, to a location that gets executed even if the application installs
|
|
a custom chunk allocation function. This resolves a virtual memory leak.
|
|
(@buchgr)
|
|
- Fix a potential tsd cleanup leak. (@cferris1000, @jasone)
|
|
- Fix run quantization. In practice this bug had no impact unless
|
|
applications requested memory with alignment exceeding one page.
|
|
(@jasone, @djwatson)
|
|
- Fix LinuxThreads-specific bootstrapping deadlock. (Cosmin Paraschiv)
|
|
- jeprof:
|
|
+ Don't discard curl options if timeout is not defined. (@djwatson)
|
|
+ Detect failed profile fetches. (@djwatson)
|
|
- Fix stats.arenas.<i>.{dss,lg_dirty_mult,decay_time,pactive,pdirty} for
|
|
--disable-stats case. (@jasone)
|
|
|
|
* 4.0.4 (October 24, 2015)
|
|
|
|
This bugfix release fixes another xallocx() regression. No other regressions
|
|
have come to light in over a month, so this is likely a good starting point
|
|
for people who prefer to wait for "dot one" releases with all the major issues
|
|
shaken out.
|
|
|
|
Bug fixes:
|
|
- Fix xallocx(..., MALLOCX_ZERO to zero the last full trailing page of large
|
|
allocations that have been randomly assigned an offset of 0 when
|
|
--enable-cache-oblivious configure option is enabled.
|
|
|
|
* 4.0.3 (September 24, 2015)
|
|
|
|
This bugfix release continues the trend of xallocx() and heap profiling fixes.
|
|
|
|
Bug fixes:
|
|
- Fix xallocx(..., MALLOCX_ZERO) to zero all trailing bytes of large
|
|
allocations when --enable-cache-oblivious configure option is enabled.
|
|
- Fix xallocx(..., MALLOCX_ZERO) to zero trailing bytes of huge allocations
|
|
when resizing from/to a size class that is not a multiple of the chunk size.
|
|
- Fix prof_tctx_dump_iter() to filter out nodes that were created after heap
|
|
profile dumping started.
|
|
- Work around a potentially bad thread-specific data initialization
|
|
interaction with NPTL (glibc's pthreads implementation).
|
|
|
|
* 4.0.2 (September 21, 2015)
|
|
|
|
This bugfix release addresses a few bugs specific to heap profiling.
|
|
|
|
Bug fixes:
|
|
- Fix ixallocx_prof_sample() to never modify nor create sampled small
|
|
allocations. xallocx() is in general incapable of moving small allocations,
|
|
so this fix removes buggy code without loss of generality.
|
|
- Fix irallocx_prof_sample() to always allocate large regions, even when
|
|
alignment is non-zero.
|
|
- Fix prof_alloc_rollback() to read tdata from thread-specific data rather
|
|
than dereferencing a potentially invalid tctx.
|
|
|
|
* 4.0.1 (September 15, 2015)
|
|
|
|
This is a bugfix release that is somewhat high risk due to the amount of
|
|
refactoring required to address deep xallocx() problems. As a side effect of
|
|
these fixes, xallocx() now tries harder to partially fulfill requests for
|
|
optional extra space. Note that a couple of minor heap profiling
|
|
optimizations are included, but these are better thought of as performance
|
|
fixes that were integral to disovering most of the other bugs.
|
|
|
|
Optimizations:
|
|
- Avoid a chunk metadata read in arena_prof_tctx_set(), since it is in the
|
|
fast path when heap profiling is enabled. Additionally, split a special
|
|
case out into arena_prof_tctx_reset(), which also avoids chunk metadata
|
|
reads.
|
|
- Optimize irallocx_prof() to optimistically update the sampler state. The
|
|
prior implementation appears to have been a holdover from when
|
|
rallocx()/xallocx() functionality was combined as rallocm().
|
|
|
|
Bug fixes:
|
|
- Fix TLS configuration such that it is enabled by default for platforms on
|
|
which it works correctly.
|
|
- Fix arenas_cache_cleanup() and arena_get_hard() to handle
|
|
allocation/deallocation within the application's thread-specific data
|
|
cleanup functions even after arenas_cache is torn down.
|
|
- Fix xallocx() bugs related to size+extra exceeding HUGE_MAXCLASS.
|
|
- Fix chunk purge hook calls for in-place huge shrinking reallocation to
|
|
specify the old chunk size rather than the new chunk size. This bug caused
|
|
no correctness issues for the default chunk purge function, but was
|
|
visible to custom functions set via the "arena.<i>.chunk_hooks" mallctl.
|
|
- Fix heap profiling bugs:
|
|
+ Fix heap profiling to distinguish among otherwise identical sample sites
|
|
with interposed resets (triggered via the "prof.reset" mallctl). This bug
|
|
could cause data structure corruption that would most likely result in a
|
|
segfault.
|
|
+ Fix irealloc_prof() to prof_alloc_rollback() on OOM.
|
|
+ Make one call to prof_active_get_unlocked() per allocation event, and use
|
|
the result throughout the relevant functions that handle an allocation
|
|
event. Also add a missing check in prof_realloc(). These fixes protect
|
|
allocation events against concurrent prof_active changes.
|
|
+ Fix ixallocx_prof() to pass usize_max and zero to ixallocx_prof_sample()
|
|
in the correct order.
|
|
+ Fix prof_realloc() to call prof_free_sampled_object() after calling
|
|
prof_malloc_sample_object(). Prior to this fix, if tctx and old_tctx were
|
|
the same, the tctx could have been prematurely destroyed.
|
|
- Fix portability bugs:
|
|
+ Don't bitshift by negative amounts when encoding/decoding run sizes in
|
|
chunk header maps. This affected systems with page sizes greater than 8
|
|
KiB.
|
|
+ Rename index_t to szind_t to avoid an existing type on Solaris.
|
|
+ Add JEMALLOC_CXX_THROW to the memalign() function prototype, in order to
|
|
match glibc and avoid compilation errors when including both
|
|
jemalloc/jemalloc.h and malloc.h in C++ code.
|
|
+ Don't assume that /bin/sh is appropriate when running size_classes.sh
|
|
during configuration.
|
|
+ Consider __sparcv9 a synonym for __sparc64__ when defining LG_QUANTUM.
|
|
+ Link tests to librt if it contains clock_gettime(2).
|
|
|
|
* 4.0.0 (August 17, 2015)
|
|
|
|
This version contains many speed and space optimizations, both minor and
|
|
major. The major themes are generalization, unification, and simplification.
|
|
Although many of these optimizations cause no visible behavior change, their
|
|
cumulative effect is substantial.
|
|
|
|
New features:
|
|
- Normalize size class spacing to be consistent across the complete size
|
|
range. By default there are four size classes per size doubling, but this
|
|
is now configurable via the --with-lg-size-class-group option. Also add the
|
|
--with-lg-page, --with-lg-page-sizes, --with-lg-quantum, and
|
|
--with-lg-tiny-min options, which can be used to tweak page and size class
|
|
settings. Impacts:
|
|
+ Worst case performance for incrementally growing/shrinking reallocation
|
|
is improved because there are far fewer size classes, and therefore
|
|
copying happens less often.
|
|
+ Internal fragmentation is limited to 20% for all but the smallest size
|
|
classes (those less than four times the quantum). (1B + 4 KiB)
|
|
and (1B + 4 MiB) previously suffered nearly 50% internal fragmentation.
|
|
+ Chunk fragmentation tends to be lower because there are fewer distinct run
|
|
sizes to pack.
|
|
- Add support for explicit tcaches. The "tcache.create", "tcache.flush", and
|
|
"tcache.destroy" mallctls control tcache lifetime and flushing, and the
|
|
MALLOCX_TCACHE(tc) and MALLOCX_TCACHE_NONE flags to the *allocx() API
|
|
control which tcache is used for each operation.
|
|
- Implement per thread heap profiling, as well as the ability to
|
|
enable/disable heap profiling on a per thread basis. Add the "prof.reset",
|
|
"prof.lg_sample", "thread.prof.name", "thread.prof.active",
|
|
"opt.prof_thread_active_init", "prof.thread_active_init", and
|
|
"thread.prof.active" mallctls.
|
|
- Add support for per arena application-specified chunk allocators, configured
|
|
via the "arena.<i>.chunk_hooks" mallctl.
|
|
- Refactor huge allocation to be managed by arenas, so that arenas now
|
|
function as general purpose independent allocators. This is important in
|
|
the context of user-specified chunk allocators, aside from the scalability
|
|
benefits. Related new statistics:
|
|
+ The "stats.arenas.<i>.huge.allocated", "stats.arenas.<i>.huge.nmalloc",
|
|
"stats.arenas.<i>.huge.ndalloc", and "stats.arenas.<i>.huge.nrequests"
|
|
mallctls provide high level per arena huge allocation statistics.
|
|
+ The "arenas.nhchunks", "arenas.hchunk.<i>.size",
|
|
"stats.arenas.<i>.hchunks.<j>.nmalloc",
|
|
"stats.arenas.<i>.hchunks.<j>.ndalloc",
|
|
"stats.arenas.<i>.hchunks.<j>.nrequests", and
|
|
"stats.arenas.<i>.hchunks.<j>.curhchunks" mallctls provide per size class
|
|
statistics.
|
|
- Add the 'util' column to malloc_stats_print() output, which reports the
|
|
proportion of available regions that are currently in use for each small
|
|
size class.
|
|
- Add "alloc" and "free" modes for for junk filling (see the "opt.junk"
|
|
mallctl), so that it is possible to separately enable junk filling for
|
|
allocation versus deallocation.
|
|
- Add the jemalloc-config script, which provides information about how
|
|
jemalloc was configured, and how to integrate it into application builds.
|
|
- Add metadata statistics, which are accessible via the "stats.metadata",
|
|
"stats.arenas.<i>.metadata.mapped", and
|
|
"stats.arenas.<i>.metadata.allocated" mallctls.
|
|
- Add the "stats.resident" mallctl, which reports the upper limit of
|
|
physically resident memory mapped by the allocator.
|
|
- Add per arena control over unused dirty page purging, via the
|
|
"arenas.lg_dirty_mult", "arena.<i>.lg_dirty_mult", and
|
|
"stats.arenas.<i>.lg_dirty_mult" mallctls.
|
|
- Add the "prof.gdump" mallctl, which makes it possible to toggle the gdump
|
|
feature on/off during program execution.
|
|
- Add sdallocx(), which implements sized deallocation. The primary
|
|
optimization over dallocx() is the removal of a metadata read, which often
|
|
suffers an L1 cache miss.
|
|
- Add missing header includes in jemalloc/jemalloc.h, so that applications
|
|
only have to #include <jemalloc/jemalloc.h>.
|
|
- Add support for additional platforms:
|
|
+ Bitrig
|
|
+ Cygwin
|
|
+ DragonFlyBSD
|
|
+ iOS
|
|
+ OpenBSD
|
|
+ OpenRISC/or1k
|
|
|
|
Optimizations:
|
|
- Maintain dirty runs in per arena LRUs rather than in per arena trees of
|
|
dirty-run-containing chunks. In practice this change significantly reduces
|
|
dirty page purging volume.
|
|
- Integrate whole chunks into the unused dirty page purging machinery. This
|
|
reduces the cost of repeated huge allocation/deallocation, because it
|
|
effectively introduces a cache of chunks.
|
|
- Split the arena chunk map into two separate arrays, in order to increase
|
|
cache locality for the frequently accessed bits.
|
|
- Move small run metadata out of runs, into arena chunk headers. This reduces
|
|
run fragmentation, smaller runs reduce external fragmentation for small size
|
|
classes, and packed (less uniformly aligned) metadata layout improves CPU
|
|
cache set distribution.
|
|
- Randomly distribute large allocation base pointer alignment relative to page
|
|
boundaries in order to more uniformly utilize CPU cache sets. This can be
|
|
disabled via the --disable-cache-oblivious configure option, and queried via
|
|
the "config.cache_oblivious" mallctl.
|
|
- Micro-optimize the fast paths for the public API functions.
|
|
- Refactor thread-specific data to reside in a single structure. This assures
|
|
that only a single TLS read is necessary per call into the public API.
|
|
- Implement in-place huge allocation growing and shrinking.
|
|
- Refactor rtree (radix tree for chunk lookups) to be lock-free, and make
|
|
additional optimizations that reduce maximum lookup depth to one or two
|
|
levels. This resolves what was a concurrency bottleneck for per arena huge
|
|
allocation, because a global data structure is critical for determining
|
|
which arenas own which huge allocations.
|
|
|
|
Incompatible changes:
|
|
- Replace --enable-cc-silence with --disable-cc-silence to suppress spurious
|
|
warnings by default.
|
|
- Assure that the constness of malloc_usable_size()'s return type matches that
|
|
of the system implementation.
|
|
- Change the heap profile dump format to support per thread heap profiling,
|
|
rename pprof to jeprof, and enhance it with the --thread=<n> option. As a
|
|
result, the bundled jeprof must now be used rather than the upstream
|
|
(gperftools) pprof.
|
|
- Disable "opt.prof_final" by default, in order to avoid atexit(3), which can
|
|
internally deadlock on some platforms.
|
|
- Change the "arenas.nlruns" mallctl type from size_t to unsigned.
|
|
- Replace the "stats.arenas.<i>.bins.<j>.allocated" mallctl with
|
|
"stats.arenas.<i>.bins.<j>.curregs".
|
|
- Ignore MALLOC_CONF in set{uid,gid,cap} binaries.
|
|
- Ignore MALLOCX_ARENA(a) in dallocx(), in favor of using the
|
|
MALLOCX_TCACHE(tc) and MALLOCX_TCACHE_NONE flags to control tcache usage.
|
|
|
|
Removed features:
|
|
- Remove the *allocm() API, which is superseded by the *allocx() API.
|
|
- Remove the --enable-dss options, and make dss non-optional on all platforms
|
|
which support sbrk(2).
|
|
- Remove the "arenas.purge" mallctl, which was obsoleted by the
|
|
"arena.<i>.purge" mallctl in 3.1.0.
|
|
- Remove the unnecessary "opt.valgrind" mallctl; jemalloc automatically
|
|
detects whether it is running inside Valgrind.
|
|
- Remove the "stats.huge.allocated", "stats.huge.nmalloc", and
|
|
"stats.huge.ndalloc" mallctls.
|
|
- Remove the --enable-mremap option.
|
|
- Remove the "stats.chunks.current", "stats.chunks.total", and
|
|
"stats.chunks.high" mallctls.
|
|
|
|
Bug fixes:
|
|
- Fix the cactive statistic to decrease (rather than increase) when active
|
|
memory decreases. This regression was first released in 3.5.0.
|
|
- Fix OOM handling in memalign() and valloc(). A variant of this bug existed
|
|
in all releases since 2.0.0, which introduced these functions.
|
|
- Fix an OOM-related regression in arena_tcache_fill_small(), which could
|
|
cause cache corruption on OOM. This regression was present in all releases
|
|
from 2.2.0 through 3.6.0.
|
|
- Fix size class overflow handling for malloc(), posix_memalign(), memalign(),
|
|
calloc(), and realloc() when profiling is enabled.
|
|
- Fix the "arena.<i>.dss" mallctl to return an error if "primary" or
|
|
"secondary" precedence is specified, but sbrk(2) is not supported.
|
|
- Fix fallback lg_floor() implementations to handle extremely large inputs.
|
|
- Ensure the default purgeable zone is after the default zone on OS X.
|
|
- Fix latent bugs in atomic_*().
|
|
- Fix the "arena.<i>.dss" mallctl to handle read-only calls.
|
|
- Fix tls_model configuration to enable the initial-exec model when possible.
|
|
- Mark malloc_conf as a weak symbol so that the application can override it.
|
|
- Correctly detect glibc's adaptive pthread mutexes.
|
|
- Fix the --without-export configure option.
|
|
|
|
* 3.6.0 (March 31, 2014)
|
|
|
|
This version contains a critical bug fix for a regression present in 3.5.0 and
|
|
3.5.1.
|
|
|
|
Bug fixes:
|
|
- Fix a regression in arena_chunk_alloc() that caused crashes during
|
|
small/large allocation if chunk allocation failed. In the absence of this
|
|
bug, chunk allocation failure would result in allocation failure, e.g. NULL
|
|
return from malloc(). This regression was introduced in 3.5.0.
|
|
- Fix backtracing for gcc intrinsics-based backtracing by specifying
|
|
-fno-omit-frame-pointer to gcc. Note that the application (and all the
|
|
libraries it links to) must also be compiled with this option for
|
|
backtracing to be reliable.
|
|
- Use dss allocation precedence for huge allocations as well as small/large
|
|
allocations.
|
|
- Fix test assertion failure message formatting. This bug did not manifest on
|
|
x86_64 systems because of implementation subtleties in va_list.
|
|
- Fix inconsequential test failures for hash and SFMT code.
|
|
|
|
New features:
|
|
- Support heap profiling on FreeBSD. This feature depends on the proc
|
|
filesystem being mounted during heap profile dumping.
|
|
|
|
* 3.5.1 (February 25, 2014)
|
|
|
|
This version primarily addresses minor bugs in test code.
|
|
|
|
Bug fixes:
|
|
- Configure Solaris/Illumos to use MADV_FREE.
|
|
- Fix junk filling for mremap(2)-based huge reallocation. This is only
|
|
relevant if configuring with the --enable-mremap option specified.
|
|
- Avoid compilation failure if 'restrict' C99 keyword is not supported by the
|
|
compiler.
|
|
- Add a configure test for SSE2 rather than assuming it is usable on i686
|
|
systems. This fixes test compilation errors, especially on 32-bit Linux
|
|
systems.
|
|
- Fix mallctl argument size mismatches (size_t vs. uint64_t) in the stats unit
|
|
test.
|
|
- Fix/remove flawed alignment-related overflow tests.
|
|
- Prevent compiler optimizations that could change backtraces in the
|
|
prof_accum unit test.
|
|
|
|
* 3.5.0 (January 22, 2014)
|
|
|
|
This version focuses on refactoring and automated testing, though it also
|
|
includes some non-trivial heap profiling optimizations not mentioned below.
|
|
|
|
New features:
|
|
- Add the *allocx() API, which is a successor to the experimental *allocm()
|
|
API. The *allocx() functions are slightly simpler to use because they have
|
|
fewer parameters, they directly return the results of primary interest, and
|
|
mallocx()/rallocx() avoid the strict aliasing pitfall that
|
|
allocm()/rallocm() share with posix_memalign(). Note that *allocm() is
|
|
slated for removal in the next non-bugfix release.
|
|
- Add support for LinuxThreads.
|
|
|
|
Bug fixes:
|
|
- Unless heap profiling is enabled, disable floating point code and don't link
|
|
with libm. This, in combination with e.g. EXTRA_CFLAGS=-mno-sse on x64
|
|
systems, makes it possible to completely disable floating point register
|
|
use. Some versions of glibc neglect to save/restore caller-saved floating
|
|
point registers during dynamic lazy symbol loading, and the symbol loading
|
|
code uses whatever malloc the application happens to have linked/loaded
|
|
with, the result being potential floating point register corruption.
|
|
- Report ENOMEM rather than EINVAL if an OOM occurs during heap profiling
|
|
backtrace creation in imemalign(). This bug impacted posix_memalign() and
|
|
aligned_alloc().
|
|
- Fix a file descriptor leak in a prof_dump_maps() error path.
|
|
- Fix prof_dump() to close the dump file descriptor for all relevant error
|
|
paths.
|
|
- Fix rallocm() to use the arena specified by the ALLOCM_ARENA(s) flag for
|
|
allocation, not just deallocation.
|
|
- Fix a data race for large allocation stats counters.
|
|
- Fix a potential infinite loop during thread exit. This bug occurred on
|
|
Solaris, and could affect other platforms with similar pthreads TSD
|
|
implementations.
|
|
- Don't junk-fill reallocations unless usable size changes. This fixes a
|
|
violation of the *allocx()/*allocm() semantics.
|
|
- Fix growing large reallocation to junk fill new space.
|
|
- Fix huge deallocation to junk fill when munmap is disabled.
|
|
- Change the default private namespace prefix from empty to je_, and change
|
|
--with-private-namespace-prefix so that it prepends an additional prefix
|
|
rather than replacing je_. This reduces the likelihood of applications
|
|
which statically link jemalloc experiencing symbol name collisions.
|
|
- Add missing private namespace mangling (relevant when
|
|
--with-private-namespace is specified).
|
|
- Add and use JEMALLOC_INLINE_C so that static inline functions are marked as
|
|
static even for debug builds.
|
|
- Add a missing mutex unlock in a malloc_init_hard() error path. In practice
|
|
this error path is never executed.
|
|
- Fix numerous bugs in malloc_strotumax() error handling/reporting. These
|
|
bugs had no impact except for malformed inputs.
|
|
- Fix numerous bugs in malloc_snprintf(). These bugs were not exercised by
|
|
existing calls, so they had no impact.
|
|
|
|
* 3.4.1 (October 20, 2013)
|
|
|
|
Bug fixes:
|
|
- Fix a race in the "arenas.extend" mallctl that could cause memory corruption
|
|
of internal data structures and subsequent crashes.
|
|
- Fix Valgrind integration flaws that caused Valgrind warnings about reads of
|
|
uninitialized memory in:
|
|
+ arena chunk headers
|
|
+ internal zero-initialized data structures (relevant to tcache and prof
|
|
code)
|
|
- Preserve errno during the first allocation. A readlink(2) call during
|
|
initialization fails unless /etc/malloc.conf exists, so errno was typically
|
|
set during the first allocation prior to this fix.
|
|
- Fix compilation warnings reported by gcc 4.8.1.
|
|
|
|
* 3.4.0 (June 2, 2013)
|
|
|
|
This version is essentially a small bugfix release, but the addition of
|
|
aarch64 support requires that the minor version be incremented.
|
|
|
|
Bug fixes:
|
|
- Fix race-triggered deadlocks in chunk_record(). These deadlocks were
|
|
typically triggered by multiple threads concurrently deallocating huge
|
|
objects.
|
|
|
|
New features:
|
|
- Add support for the aarch64 architecture.
|
|
|
|
* 3.3.1 (March 6, 2013)
|
|
|
|
This version fixes bugs that are typically encountered only when utilizing
|
|
custom run-time options.
|
|
|
|
Bug fixes:
|
|
- Fix a locking order bug that could cause deadlock during fork if heap
|
|
profiling were enabled.
|
|
- Fix a chunk recycling bug that could cause the allocator to lose track of
|
|
whether a chunk was zeroed. On FreeBSD, NetBSD, and OS X, it could cause
|
|
corruption if allocating via sbrk(2) (unlikely unless running with the
|
|
"dss:primary" option specified). This was completely harmless on Linux
|
|
unless using mlockall(2) (and unlikely even then, unless the
|
|
--disable-munmap configure option or the "dss:primary" option was
|
|
specified). This regression was introduced in 3.1.0 by the
|
|
mlockall(2)/madvise(2) interaction fix.
|
|
- Fix TLS-related memory corruption that could occur during thread exit if the
|
|
thread never allocated memory. Only the quarantine and prof facilities were
|
|
susceptible.
|
|
- Fix two quarantine bugs:
|
|
+ Internal reallocation of the quarantined object array leaked the old
|
|
array.
|
|
+ Reallocation failure for internal reallocation of the quarantined object
|
|
array (very unlikely) resulted in memory corruption.
|
|
- Fix Valgrind integration to annotate all internally allocated memory in a
|
|
way that keeps Valgrind happy about internal data structure access.
|
|
- Fix building for s390 systems.
|
|
|
|
* 3.3.0 (January 23, 2013)
|
|
|
|
This version includes a few minor performance improvements in addition to the
|
|
listed new features and bug fixes.
|
|
|
|
New features:
|
|
- Add clipping support to lg_chunk option processing.
|
|
- Add the --enable-ivsalloc option.
|
|
- Add the --without-export option.
|
|
- Add the --disable-zone-allocator option.
|
|
|
|
Bug fixes:
|
|
- Fix "arenas.extend" mallctl to output the number of arenas.
|
|
- Fix chunk_recycle() to unconditionally inform Valgrind that returned memory
|
|
is undefined.
|
|
- Fix build break on FreeBSD related to alloca.h.
|
|
|
|
* 3.2.0 (November 9, 2012)
|
|
|
|
In addition to a couple of bug fixes, this version modifies page run
|
|
allocation and dirty page purging algorithms in order to better control
|
|
page-level virtual memory fragmentation.
|
|
|
|
Incompatible changes:
|
|
- Change the "opt.lg_dirty_mult" default from 5 to 3 (32:1 to 8:1).
|
|
|
|
Bug fixes:
|
|
- Fix dss/mmap allocation precedence code to use recyclable mmap memory only
|
|
after primary dss allocation fails.
|
|
- Fix deadlock in the "arenas.purge" mallctl. This regression was introduced
|
|
in 3.1.0 by the addition of the "arena.<i>.purge" mallctl.
|
|
|
|
* 3.1.0 (October 16, 2012)
|
|
|
|
New features:
|
|
- Auto-detect whether running inside Valgrind, thus removing the need to
|
|
manually specify MALLOC_CONF=valgrind:true.
|
|
- Add the "arenas.extend" mallctl, which allows applications to create
|
|
manually managed arenas.
|
|
- Add the ALLOCM_ARENA() flag for {,r,d}allocm().
|
|
- Add the "opt.dss", "arena.<i>.dss", and "stats.arenas.<i>.dss" mallctls,
|
|
which provide control over dss/mmap precedence.
|
|
- Add the "arena.<i>.purge" mallctl, which obsoletes "arenas.purge".
|
|
- Define LG_QUANTUM for hppa.
|
|
|
|
Incompatible changes:
|
|
- Disable tcache by default if running inside Valgrind, in order to avoid
|
|
making unallocated objects appear reachable to Valgrind.
|
|
- Drop const from malloc_usable_size() argument on Linux.
|
|
|
|
Bug fixes:
|
|
- Fix heap profiling crash if sampled object is freed via realloc(p, 0).
|
|
- Remove const from __*_hook variable declarations, so that glibc can modify
|
|
them during process forking.
|
|
- Fix mlockall(2)/madvise(2) interaction.
|
|
- Fix fork(2)-related deadlocks.
|
|
- Fix error return value for "thread.tcache.enabled" mallctl.
|
|
|
|
* 3.0.0 (May 11, 2012)
|
|
|
|
Although this version adds some major new features, the primary focus is on
|
|
internal code cleanup that facilitates maintainability and portability, most
|
|
of which is not reflected in the ChangeLog. This is the first release to
|
|
incorporate substantial contributions from numerous other developers, and the
|
|
result is a more broadly useful allocator (see the git revision history for
|
|
contribution details). Note that the license has been unified, thanks to
|
|
Facebook granting a license under the same terms as the other copyright
|
|
holders (see COPYING).
|
|
|
|
New features:
|
|
- Implement Valgrind support, redzones, and quarantine.
|
|
- Add support for additional platforms:
|
|
+ FreeBSD
|
|
+ Mac OS X Lion
|
|
+ MinGW
|
|
+ Windows (no support yet for replacing the system malloc)
|
|
- Add support for additional architectures:
|
|
+ MIPS
|
|
+ SH4
|
|
+ Tilera
|
|
- Add support for cross compiling.
|
|
- Add nallocm(), which rounds a request size up to the nearest size class
|
|
without actually allocating.
|
|
- Implement aligned_alloc() (blame C11).
|
|
- Add the "thread.tcache.enabled" mallctl.
|
|
- Add the "opt.prof_final" mallctl.
|
|
- Update pprof (from gperftools 2.0).
|
|
- Add the --with-mangling option.
|
|
- Add the --disable-experimental option.
|
|
- Add the --disable-munmap option, and make it the default on Linux.
|
|
- Add the --enable-mremap option, which disables use of mremap(2) by default.
|
|
|
|
Incompatible changes:
|
|
- Enable stats by default.
|
|
- Enable fill by default.
|
|
- Disable lazy locking by default.
|
|
- Rename the "tcache.flush" mallctl to "thread.tcache.flush".
|
|
- Rename the "arenas.pagesize" mallctl to "arenas.page".
|
|
- Change the "opt.lg_prof_sample" default from 0 to 19 (1 B to 512 KiB).
|
|
- Change the "opt.prof_accum" default from true to false.
|
|
|
|
Removed features:
|
|
- Remove the swap feature, including the "config.swap", "swap.avail",
|
|
"swap.prezeroed", "swap.nfds", and "swap.fds" mallctls.
|
|
- Remove highruns statistics, including the
|
|
"stats.arenas.<i>.bins.<j>.highruns" and
|
|
"stats.arenas.<i>.lruns.<j>.highruns" mallctls.
|
|
- As part of small size class refactoring, remove the "opt.lg_[qc]space_max",
|
|
"arenas.cacheline", "arenas.subpage", "arenas.[tqcs]space_{min,max}", and
|
|
"arenas.[tqcs]bins" mallctls.
|
|
- Remove the "arenas.chunksize" mallctl.
|
|
- Remove the "opt.lg_prof_tcmax" option.
|
|
- Remove the "opt.lg_prof_bt_max" option.
|
|
- Remove the "opt.lg_tcache_gc_sweep" option.
|
|
- Remove the --disable-tiny option, including the "config.tiny" mallctl.
|
|
- Remove the --enable-dynamic-page-shift configure option.
|
|
- Remove the --enable-sysv configure option.
|
|
|
|
Bug fixes:
|
|
- Fix a statistics-related bug in the "thread.arena" mallctl that could cause
|
|
invalid statistics and crashes.
|
|
- Work around TLS deallocation via free() on Linux. This bug could cause
|
|
write-after-free memory corruption.
|
|
- Fix a potential deadlock that could occur during interval- and
|
|
growth-triggered heap profile dumps.
|
|
- Fix large calloc() zeroing bugs due to dropping chunk map unzeroed flags.
|
|
- Fix chunk_alloc_dss() to stop claiming memory is zeroed. This bug could
|
|
cause memory corruption and crashes with --enable-dss specified.
|
|
- Fix fork-related bugs that could cause deadlock in children between fork
|
|
and exec.
|
|
- Fix malloc_stats_print() to honor 'b' and 'l' in the opts parameter.
|
|
- Fix realloc(p, 0) to act like free(p).
|
|
- Do not enforce minimum alignment in memalign().
|
|
- Check for NULL pointer in malloc_usable_size().
|
|
- Fix an off-by-one heap profile statistics bug that could be observed in
|
|
interval- and growth-triggered heap profiles.
|
|
- Fix the "epoch" mallctl to update cached stats even if the passed in epoch
|
|
is 0.
|
|
- Fix bin->runcur management to fix a layout policy bug. This bug did not
|
|
affect correctness.
|
|
- Fix a bug in choose_arena_hard() that potentially caused more arenas to be
|
|
initialized than necessary.
|
|
- Add missing "opt.lg_tcache_max" mallctl implementation.
|
|
- Use glibc allocator hooks to make mixed allocator usage less likely.
|
|
- Fix build issues for --disable-tcache.
|
|
- Don't mangle pthread_create() when --with-private-namespace is specified.
|
|
|
|
* 2.2.5 (November 14, 2011)
|
|
|
|
Bug fixes:
|
|
- Fix huge_ralloc() race when using mremap(2). This is a serious bug that
|
|
could cause memory corruption and/or crashes.
|
|
- Fix huge_ralloc() to maintain chunk statistics.
|
|
- Fix malloc_stats_print(..., "a") output.
|
|
|
|
* 2.2.4 (November 5, 2011)
|
|
|
|
Bug fixes:
|
|
- Initialize arenas_tsd before using it. This bug existed for 2.2.[0-3], as
|
|
well as for --disable-tls builds in earlier releases.
|
|
- Do not assume a 4 KiB page size in test/rallocm.c.
|
|
|
|
* 2.2.3 (August 31, 2011)
|
|
|
|
This version fixes numerous bugs related to heap profiling.
|
|
|
|
Bug fixes:
|
|
- Fix a prof-related race condition. This bug could cause memory corruption,
|
|
but only occurred in non-default configurations (prof_accum:false).
|
|
- Fix off-by-one backtracing issues (make sure that prof_alloc_prep() is
|
|
excluded from backtraces).
|
|
- Fix a prof-related bug in realloc() (only triggered by OOM errors).
|
|
- Fix prof-related bugs in allocm() and rallocm().
|
|
- Fix prof_tdata_cleanup() for --disable-tls builds.
|
|
- Fix a relative include path, to fix objdir builds.
|
|
|
|
* 2.2.2 (July 30, 2011)
|
|
|
|
Bug fixes:
|
|
- Fix a build error for --disable-tcache.
|
|
- Fix assertions in arena_purge() (for real this time).
|
|
- Add the --with-private-namespace option. This is a workaround for symbol
|
|
conflicts that can inadvertently arise when using static libraries.
|
|
|
|
* 2.2.1 (March 30, 2011)
|
|
|
|
Bug fixes:
|
|
- Implement atomic operations for x86/x64. This fixes compilation failures
|
|
for versions of gcc that are still in wide use.
|
|
- Fix an assertion in arena_purge().
|
|
|
|
* 2.2.0 (March 22, 2011)
|
|
|
|
This version incorporates several improvements to algorithms and data
|
|
structures that tend to reduce fragmentation and increase speed.
|
|
|
|
New features:
|
|
- Add the "stats.cactive" mallctl.
|
|
- Update pprof (from google-perftools 1.7).
|
|
- Improve backtracing-related configuration logic, and add the
|
|
--disable-prof-libgcc option.
|
|
|
|
Bug fixes:
|
|
- Change default symbol visibility from "internal", to "hidden", which
|
|
decreases the overhead of library-internal function calls.
|
|
- Fix symbol visibility so that it is also set on OS X.
|
|
- Fix a build dependency regression caused by the introduction of the .pic.o
|
|
suffix for PIC object files.
|
|
- Add missing checks for mutex initialization failures.
|
|
- Don't use libgcc-based backtracing except on x64, where it is known to work.
|
|
- Fix deadlocks on OS X that were due to memory allocation in
|
|
pthread_mutex_lock().
|
|
- Heap profiling-specific fixes:
|
|
+ Fix memory corruption due to integer overflow in small region index
|
|
computation, when using a small enough sample interval that profiling
|
|
context pointers are stored in small run headers.
|
|
+ Fix a bootstrap ordering bug that only occurred with TLS disabled.
|
|
+ Fix a rallocm() rsize bug.
|
|
+ Fix error detection bugs for aligned memory allocation.
|
|
|
|
* 2.1.3 (March 14, 2011)
|
|
|
|
Bug fixes:
|
|
- Fix a cpp logic regression (due to the "thread.{de,}allocatedp" mallctl fix
|
|
for OS X in 2.1.2).
|
|
- Fix a "thread.arena" mallctl bug.
|
|
- Fix a thread cache stats merging bug.
|
|
|
|
* 2.1.2 (March 2, 2011)
|
|
|
|
Bug fixes:
|
|
- Fix "thread.{de,}allocatedp" mallctl for OS X.
|
|
- Add missing jemalloc.a to build system.
|
|
|
|
* 2.1.1 (January 31, 2011)
|
|
|
|
Bug fixes:
|
|
- Fix aligned huge reallocation (affected allocm()).
|
|
- Fix the ALLOCM_LG_ALIGN macro definition.
|
|
- Fix a heap dumping deadlock.
|
|
- Fix a "thread.arena" mallctl bug.
|
|
|
|
* 2.1.0 (December 3, 2010)
|
|
|
|
This version incorporates some optimizations that can't quite be considered
|
|
bug fixes.
|
|
|
|
New features:
|
|
- Use Linux's mremap(2) for huge object reallocation when possible.
|
|
- Avoid locking in mallctl*() when possible.
|
|
- Add the "thread.[de]allocatedp" mallctl's.
|
|
- Convert the manual page source from roff to DocBook, and generate both roff
|
|
and HTML manuals.
|
|
|
|
Bug fixes:
|
|
- Fix a crash due to incorrect bootstrap ordering. This only impacted
|
|
--enable-debug --enable-dss configurations.
|
|
- Fix a minor statistics bug for mallctl("swap.avail", ...).
|
|
|
|
* 2.0.1 (October 29, 2010)
|
|
|
|
Bug fixes:
|
|
- Fix a race condition in heap profiling that could cause undefined behavior
|
|
if "opt.prof_accum" were disabled.
|
|
- Add missing mutex unlocks for some OOM error paths in the heap profiling
|
|
code.
|
|
- Fix a compilation error for non-C99 builds.
|
|
|
|
* 2.0.0 (October 24, 2010)
|
|
|
|
This version focuses on the experimental *allocm() API, and on improved
|
|
run-time configuration/introspection. Nonetheless, numerous performance
|
|
improvements are also included.
|
|
|
|
New features:
|
|
- Implement the experimental {,r,s,d}allocm() API, which provides a superset
|
|
of the functionality available via malloc(), calloc(), posix_memalign(),
|
|
realloc(), malloc_usable_size(), and free(). These functions can be used to
|
|
allocate/reallocate aligned zeroed memory, ask for optional extra memory
|
|
during reallocation, prevent object movement during reallocation, etc.
|
|
- Replace JEMALLOC_OPTIONS/JEMALLOC_PROF_PREFIX with MALLOC_CONF, which is
|
|
more human-readable, and more flexible. For example:
|
|
JEMALLOC_OPTIONS=AJP
|
|
is now:
|
|
MALLOC_CONF=abort:true,fill:true,stats_print:true
|
|
- Port to Apple OS X. Sponsored by Mozilla.
|
|
- Make it possible for the application to control thread-->arena mappings via
|
|
the "thread.arena" mallctl.
|
|
- Add compile-time support for all TLS-related functionality via pthreads TSD.
|
|
This is mainly of interest for OS X, which does not support TLS, but has a
|
|
TSD implementation with similar performance.
|
|
- Override memalign() and valloc() if they are provided by the system.
|
|
- Add the "arenas.purge" mallctl, which can be used to synchronously purge all
|
|
dirty unused pages.
|
|
- Make cumulative heap profiling data optional, so that it is possible to
|
|
limit the amount of memory consumed by heap profiling data structures.
|
|
- Add per thread allocation counters that can be accessed via the
|
|
"thread.allocated" and "thread.deallocated" mallctls.
|
|
|
|
Incompatible changes:
|
|
- Remove JEMALLOC_OPTIONS and malloc_options (see MALLOC_CONF above).
|
|
- Increase default backtrace depth from 4 to 128 for heap profiling.
|
|
- Disable interval-based profile dumps by default.
|
|
|
|
Bug fixes:
|
|
- Remove bad assertions in fork handler functions. These assertions could
|
|
cause aborts for some combinations of configure settings.
|
|
- Fix strerror_r() usage to deal with non-standard semantics in GNU libc.
|
|
- Fix leak context reporting. This bug tended to cause the number of contexts
|
|
to be underreported (though the reported number of objects and bytes were
|
|
correct).
|
|
- Fix a realloc() bug for large in-place growing reallocation. This bug could
|
|
cause memory corruption, but it was hard to trigger.
|
|
- Fix an allocation bug for small allocations that could be triggered if
|
|
multiple threads raced to create a new run of backing pages.
|
|
- Enhance the heap profiler to trigger samples based on usable size, rather
|
|
than request size.
|
|
- Fix a heap profiling bug due to sometimes losing track of requested object
|
|
size for sampled objects.
|
|
|
|
* 1.0.3 (August 12, 2010)
|
|
|
|
Bug fixes:
|
|
- Fix the libunwind-based implementation of stack backtracing (used for heap
|
|
profiling). This bug could cause zero-length backtraces to be reported.
|
|
- Add a missing mutex unlock in library initialization code. If multiple
|
|
threads raced to initialize malloc, some of them could end up permanently
|
|
blocked.
|
|
|
|
* 1.0.2 (May 11, 2010)
|
|
|
|
Bug fixes:
|
|
- Fix junk filling of large objects, which could cause memory corruption.
|
|
- Add MAP_NORESERVE support for chunk mapping, because otherwise virtual
|
|
memory limits could cause swap file configuration to fail. Contributed by
|
|
Jordan DeLong.
|
|
|
|
* 1.0.1 (April 14, 2010)
|
|
|
|
Bug fixes:
|
|
- Fix compilation when --enable-fill is specified.
|
|
- Fix threads-related profiling bugs that affected accuracy and caused memory
|
|
to be leaked during thread exit.
|
|
- Fix dirty page purging race conditions that could cause crashes.
|
|
- Fix crash in tcache flushing code during thread destruction.
|
|
|
|
* 1.0.0 (April 11, 2010)
|
|
|
|
This release focuses on speed and run-time introspection. Numerous
|
|
algorithmic improvements make this release substantially faster than its
|
|
predecessors.
|
|
|
|
New features:
|
|
- Implement autoconf-based configuration system.
|
|
- Add mallctl*(), for the purposes of introspection and run-time
|
|
configuration.
|
|
- Make it possible for the application to manually flush a thread's cache, via
|
|
the "tcache.flush" mallctl.
|
|
- Base maximum dirty page count on proportion of active memory.
|
|
- Compute various additional run-time statistics, including per size class
|
|
statistics for large objects.
|
|
- Expose malloc_stats_print(), which can be called repeatedly by the
|
|
application.
|
|
- Simplify the malloc_message() signature to only take one string argument,
|
|
and incorporate an opaque data pointer argument for use by the application
|
|
in combination with malloc_stats_print().
|
|
- Add support for allocation backed by one or more swap files, and allow the
|
|
application to disable over-commit if swap files are in use.
|
|
- Implement allocation profiling and leak checking.
|
|
|
|
Removed features:
|
|
- Remove the dynamic arena rebalancing code, since thread-specific caching
|
|
reduces its utility.
|
|
|
|
Bug fixes:
|
|
- Modify chunk allocation to work when address space layout randomization
|
|
(ASLR) is in use.
|
|
- Fix thread cleanup bugs related to TLS destruction.
|
|
- Handle 0-size allocation requests in posix_memalign().
|
|
- Fix a chunk leak. The leaked chunks were never touched, so this impacted
|
|
virtual memory usage, but not physical memory usage.
|
|
|
|
* linux_2008082[78]a (August 27/28, 2008)
|
|
|
|
These snapshot releases are the simple result of incorporating Linux-specific
|
|
support into the FreeBSD malloc sources.
|
|
|
|
--------------------------------------------------------------------------------
|
|
vim:filetype=text:textwidth=80
|