214 lines
8.8 KiB
Plaintext
214 lines
8.8 KiB
Plaintext
Following are change highlights associated with official releases. Important
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bug fixes are all mentioned, but internal enhancements are omitted here for
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brevity (even though they are more fun to write about). Much more detail can be
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found in the git revision history:
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http://www.canonware.com/cgi-bin/gitweb.cgi?p=jemalloc.git
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git://canonware.com/jemalloc.git
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* 2.2.1 (March 30, 2011)
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Bug fixes:
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- Implement atomic operations for x86/x64. This fixes compilation failures
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for versions of gcc that are still in wide use.
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- Fix an assertion in arena_purge().
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* 2.2.0 (March 22, 2011)
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This version incorporates several improvements to algorithms and data
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structures that tend to reduce fragmentation and increase speed.
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New features:
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- Add the "stats.cactive" mallctl.
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- Update pprof (from google-perftools 1.7).
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- Improve backtracing-related configuration logic, and add the
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--disable-prof-libgcc option.
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Bug fixes:
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- Change default symbol visibility from "internal", to "hidden", which
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decreases the overhead of library-internal function calls.
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- Fix symbol visibility so that it is also set on OS X.
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- Fix a build dependency regression caused by the introduction of the .pic.o
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suffix for PIC object files.
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- Add missing checks for mutex initialization failures.
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- Don't use libgcc-based backtracing except on x64, where it is known to work.
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- Fix deadlocks on OS X that were due to memory allocation in
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pthread_mutex_lock().
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- Heap profiling-specific fixes:
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+ Fix memory corruption due to integer overflow in small region index
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computation, when using a small enough sample interval that profiling
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context pointers are stored in small run headers.
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+ Fix a bootstrap ordering bug that only occurred with TLS disabled.
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+ Fix a rallocm() rsize bug.
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+ Fix error detection bugs for aligned memory allocation.
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* 2.1.3 (March 14, 2011)
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Bug fixes:
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- Fix a cpp logic regression (due to the "thread.{de,}allocatedp" mallctl fix
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for OS X in 2.1.2).
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- Fix a "thread.arena" mallctl bug.
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- Fix a thread cache stats merging bug.
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* 2.1.2 (March 2, 2011)
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Bug fixes:
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- Fix "thread.{de,}allocatedp" mallctl for OS X.
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- Add missing jemalloc.a to build system.
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* 2.1.1 (January 31, 2011)
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Bug fixes:
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- Fix aligned huge reallocation (affected allocm()).
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- Fix the ALLOCM_LG_ALIGN macro definition.
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- Fix a heap dumping deadlock.
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- Fix a "thread.arena" mallctl bug.
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* 2.1.0 (December 3, 2010)
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This version incorporates some optimizations that can't quite be considered
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bug fixes.
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New features:
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- Use Linux's mremap(2) for huge object reallocation when possible.
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- Avoid locking in mallctl*() when possible.
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- Add the "thread.[de]allocatedp" mallctl's.
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- Convert the manual page source from roff to DocBook, and generate both roff
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and HTML manuals.
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Bug fixes:
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- Fix a crash due to incorrect bootstrap ordering. This only impacted
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--enable-debug --enable-dss configurations.
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- Fix a minor statistics bug for mallctl("swap.avail", ...).
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* 2.0.1 (October 29, 2010)
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Bug fixes:
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- Fix a race condition in heap profiling that could cause undefined behavior
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if "opt.prof_accum" were disabled.
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- Add missing mutex unlocks for some OOM error paths in the heap profiling
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code.
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- Fix a compilation error for non-C99 builds.
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* 2.0.0 (October 24, 2010)
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This version focuses on the experimental *allocm() API, and on improved
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run-time configuration/introspection. Nonetheless, numerous performance
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improvements are also included.
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New features:
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- Implement the experimental {,r,s,d}allocm() API, which provides a superset
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of the functionality available via malloc(), calloc(), posix_memalign(),
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realloc(), malloc_usable_size(), and free(). These functions can be used to
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allocate/reallocate aligned zeroed memory, ask for optional extra memory
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during reallocation, prevent object movement during reallocation, etc.
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- Replace JEMALLOC_OPTIONS/JEMALLOC_PROF_PREFIX with MALLOC_CONF, which is
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more human-readable, and more flexible. For example:
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JEMALLOC_OPTIONS=AJP
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is now:
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MALLOC_CONF=abort:true,fill:true,stats_print:true
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- Port to Apple OS X. Sponsored by Mozilla.
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- Make it possible for the application to control thread-->arena mappings via
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the "thread.arena" mallctl.
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- Add compile-time support for all TLS-related functionality via pthreads TSD.
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This is mainly of interest for OS X, which does not support TLS, but has a
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TSD implementation with similar performance.
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- Override memalign() and valloc() if they are provided by the system.
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- Add the "arenas.purge" mallctl, which can be used to synchronously purge all
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dirty unused pages.
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- Make cumulative heap profiling data optional, so that it is possible to
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limit the amount of memory consumed by heap profiling data structures.
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- Add per thread allocation counters that can be accessed via the
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"thread.allocated" and "thread.deallocated" mallctls.
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Incompatible changes:
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- Remove JEMALLOC_OPTIONS and malloc_options (see MALLOC_CONF above).
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- Increase default backtrace depth from 4 to 128 for heap profiling.
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- Disable interval-based profile dumps by default.
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Bug fixes:
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- Remove bad assertions in fork handler functions. These assertions could
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cause aborts for some combinations of configure settings.
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- Fix strerror_r() usage to deal with non-standard semantics in GNU libc.
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- Fix leak context reporting. This bug tended to cause the number of contexts
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to be underreported (though the reported number of objects and bytes were
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correct).
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- Fix a realloc() bug for large in-place growing reallocation. This bug could
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cause memory corruption, but it was hard to trigger.
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- Fix an allocation bug for small allocations that could be triggered if
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multiple threads raced to create a new run of backing pages.
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- Enhance the heap profiler to trigger samples based on usable size, rather
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than request size.
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- Fix a heap profiling bug due to sometimes losing track of requested object
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size for sampled objects.
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* 1.0.3 (August 12, 2010)
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Bug fixes:
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- Fix the libunwind-based implementation of stack backtracing (used for heap
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profiling). This bug could cause zero-length backtraces to be reported.
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- Add a missing mutex unlock in library initialization code. If multiple
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threads raced to initialize malloc, some of them could end up permanently
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blocked.
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* 1.0.2 (May 11, 2010)
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Bug fixes:
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- Fix junk filling of large objects, which could cause memory corruption.
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- Add MAP_NORESERVE support for chunk mapping, because otherwise virtual
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memory limits could cause swap file configuration to fail. Contributed by
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Jordan DeLong.
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* 1.0.1 (April 14, 2010)
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Bug fixes:
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- Fix compilation when --enable-fill is specified.
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- Fix threads-related profiling bugs that affected accuracy and caused memory
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to be leaked during thread exit.
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- Fix dirty page purging race conditions that could cause crashes.
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- Fix crash in tcache flushing code during thread destruction.
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* 1.0.0 (April 11, 2010)
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This release focuses on speed and run-time introspection. Numerous
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algorithmic improvements make this release substantially faster than its
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predecessors.
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New features:
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- Implement autoconf-based configuration system.
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- Add mallctl*(), for the purposes of introspection and run-time
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configuration.
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- Make it possible for the application to manually flush a thread's cache, via
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the "tcache.flush" mallctl.
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- Base maximum dirty page count on proportion of active memory.
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- Compute various addtional run-time statistics, including per size class
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statistics for large objects.
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- Expose malloc_stats_print(), which can be called repeatedly by the
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application.
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- Simplify the malloc_message() signature to only take one string argument,
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and incorporate an opaque data pointer argument for use by the application
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in combination with malloc_stats_print().
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- Add support for allocation backed by one or more swap files, and allow the
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application to disable over-commit if swap files are in use.
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- Implement allocation profiling and leak checking.
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Removed features:
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- Remove the dynamic arena rebalancing code, since thread-specific caching
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reduces its utility.
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Bug fixes:
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- Modify chunk allocation to work when address space layout randomization
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(ASLR) is in use.
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- Fix thread cleanup bugs related to TLS destruction.
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- Handle 0-size allocation requests in posix_memalign().
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- Fix a chunk leak. The leaked chunks were never touched, so this impacted
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virtual memory usage, but not physical memory usage.
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* linux_2008082[78]a (August 27/28, 2008)
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These snapshot releases are the simple result of incorporating Linux-specific
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support into the FreeBSD malloc sources.
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--------------------------------------------------------------------------------
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vim:filetype=text:textwidth=80
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