ChangeLog

    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.

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