+++ /dev/null
-Following are change highlights associated with official releases. Important
-bug fixes are all mentioned, but internal enhancements are omitted here for
-brevity (even though they are more fun to write about). Much more detail can be
-found in the git revision history:
-
- http://www.canonware.com/cgi-bin/gitweb.cgi?p=jemalloc.git
- git://canonware.com/jemalloc.git
-
-* 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 addtional 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.
-
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