deps/jemalloc/ChangeLog

   1 Following are change highlights associated with official releases.  Important
   2 bug fixes are all mentioned, but internal enhancements are omitted here for
   3 brevity (even though they are more fun to write about).  Much more detail can be
   4 found in the git revision history:
   5
   6     http://www.canonware.com/cgi-bin/gitweb.cgi?p=jemalloc.git
   7     git://canonware.com/jemalloc.git
   8
   9 * 2.2.5 (November 14, 2011)
  10
  11   Bug fixes:
  12   - Fix huge_ralloc() race when using mremap(2).  This is a serious bug that
  13     could cause memory corruption and/or crashes.
  14   - Fix huge_ralloc() to maintain chunk statistics.
  15   - Fix malloc_stats_print(..., "a") output.
  16
  17 * 2.2.4 (November 5, 2011)
  18
  19   Bug fixes:
  20   - Initialize arenas_tsd before using it.  This bug existed for 2.2.[0-3], as
  21     well as for --disable-tls builds in earlier releases.
  22   - Do not assume a 4 KiB page size in test/rallocm.c.
  23
  24 * 2.2.3 (August 31, 2011)
  25
  26   This version fixes numerous bugs related to heap profiling.
  27
  28   Bug fixes:
  29   - Fix a prof-related race condition.  This bug could cause memory corruption,
  30     but only occurred in non-default configurations (prof_accum:false).
  31   - Fix off-by-one backtracing issues (make sure that prof_alloc_prep() is
  32     excluded from backtraces).
  33   - Fix a prof-related bug in realloc() (only triggered by OOM errors).
  34   - Fix prof-related bugs in allocm() and rallocm().
  35   - Fix prof_tdata_cleanup() for --disable-tls builds.
  36   - Fix a relative include path, to fix objdir builds.
  37
  38 * 2.2.2 (July 30, 2011)
  39
  40   Bug fixes:
  41   - Fix a build error for --disable-tcache.
  42   - Fix assertions in arena_purge() (for real this time).
  43   - Add the --with-private-namespace option.  This is a workaround for symbol
  44     conflicts that can inadvertently arise when using static libraries.
  45
  46 * 2.2.1 (March 30, 2011)
  47
  48   Bug fixes:
  49   - Implement atomic operations for x86/x64.  This fixes compilation failures
  50     for versions of gcc that are still in wide use.
  51   - Fix an assertion in arena_purge().
  52
  53 * 2.2.0 (March 22, 2011)
  54
  55   This version incorporates several improvements to algorithms and data
  56   structures that tend to reduce fragmentation and increase speed.
  57
  58   New features:
  59   - Add the "stats.cactive" mallctl.
  60   - Update pprof (from google-perftools 1.7).
  61   - Improve backtracing-related configuration logic, and add the
  62     --disable-prof-libgcc option.
  63
  64   Bug fixes:
  65   - Change default symbol visibility from "internal", to "hidden", which
  66     decreases the overhead of library-internal function calls.
  67   - Fix symbol visibility so that it is also set on OS X.
  68   - Fix a build dependency regression caused by the introduction of the .pic.o
  69     suffix for PIC object files.
  70   - Add missing checks for mutex initialization failures.
  71   - Don't use libgcc-based backtracing except on x64, where it is known to work.
  72   - Fix deadlocks on OS X that were due to memory allocation in
  73     pthread_mutex_lock().
  74   - Heap profiling-specific fixes:
  75     + Fix memory corruption due to integer overflow in small region index
  76       computation, when using a small enough sample interval that profiling
  77       context pointers are stored in small run headers.
  78     + Fix a bootstrap ordering bug that only occurred with TLS disabled.
  79     + Fix a rallocm() rsize bug.
  80     + Fix error detection bugs for aligned memory allocation.
  81
  82 * 2.1.3 (March 14, 2011)
  83
  84   Bug fixes:
  85   - Fix a cpp logic regression (due to the "thread.{de,}allocatedp" mallctl fix
  86     for OS X in 2.1.2).
  87   - Fix a "thread.arena" mallctl bug.
  88   - Fix a thread cache stats merging bug.
  89
  90 * 2.1.2 (March 2, 2011)
  91
  92   Bug fixes:
  93   - Fix "thread.{de,}allocatedp" mallctl for OS X.
  94   - Add missing jemalloc.a to build system.
  95
  96 * 2.1.1 (January 31, 2011)
  97
  98   Bug fixes:
  99   - Fix aligned huge reallocation (affected allocm()).
 100   - Fix the ALLOCM_LG_ALIGN macro definition.
 101   - Fix a heap dumping deadlock.
 102   - Fix a "thread.arena" mallctl bug.
 103
 104 * 2.1.0 (December 3, 2010)
 105
 106   This version incorporates some optimizations that can't quite be considered
 107   bug fixes.
 108
 109   New features:
 110   - Use Linux's mremap(2) for huge object reallocation when possible.
 111   - Avoid locking in mallctl*() when possible.
 112   - Add the "thread.[de]allocatedp" mallctl's.
 113   - Convert the manual page source from roff to DocBook, and generate both roff
 114     and HTML manuals.
 115
 116   Bug fixes:
 117   - Fix a crash due to incorrect bootstrap ordering.  This only impacted
 118     --enable-debug --enable-dss configurations.
 119   - Fix a minor statistics bug for mallctl("swap.avail", ...).
 120
 121 * 2.0.1 (October 29, 2010)
 122
 123   Bug fixes:
 124   - Fix a race condition in heap profiling that could cause undefined behavior
 125     if "opt.prof_accum" were disabled.
 126   - Add missing mutex unlocks for some OOM error paths in the heap profiling
 127     code.
 128   - Fix a compilation error for non-C99 builds.
 129
 130 * 2.0.0 (October 24, 2010)
 131
 132   This version focuses on the experimental *allocm() API, and on improved
 133   run-time configuration/introspection.  Nonetheless, numerous performance
 134   improvements are also included.
 135
 136   New features:
 137   - Implement the experimental {,r,s,d}allocm() API, which provides a superset
 138     of the functionality available via malloc(), calloc(), posix_memalign(),
 139     realloc(), malloc_usable_size(), and free().  These functions can be used to
 140     allocate/reallocate aligned zeroed memory, ask for optional extra memory
 141     during reallocation, prevent object movement during reallocation, etc.
 142   - Replace JEMALLOC_OPTIONS/JEMALLOC_PROF_PREFIX with MALLOC_CONF, which is
 143     more human-readable, and more flexible.  For example:
 144       JEMALLOC_OPTIONS=AJP
 145     is now:
 146       MALLOC_CONF=abort:true,fill:true,stats_print:true
 147   - Port to Apple OS X.  Sponsored by Mozilla.
 148   - Make it possible for the application to control thread-->arena mappings via
 149     the "thread.arena" mallctl.
 150   - Add compile-time support for all TLS-related functionality via pthreads TSD.
 151     This is mainly of interest for OS X, which does not support TLS, but has a
 152     TSD implementation with similar performance.
 153   - Override memalign() and valloc() if they are provided by the system.
 154   - Add the "arenas.purge" mallctl, which can be used to synchronously purge all
 155     dirty unused pages.
 156   - Make cumulative heap profiling data optional, so that it is possible to
 157     limit the amount of memory consumed by heap profiling data structures.
 158   - Add per thread allocation counters that can be accessed via the
 159     "thread.allocated" and "thread.deallocated" mallctls.
 160
 161   Incompatible changes:
 162   - Remove JEMALLOC_OPTIONS and malloc_options (see MALLOC_CONF above).
 163   - Increase default backtrace depth from 4 to 128 for heap profiling.
 164   - Disable interval-based profile dumps by default.
 165
 166   Bug fixes:
 167   - Remove bad assertions in fork handler functions.  These assertions could
 168     cause aborts for some combinations of configure settings.
 169   - Fix strerror_r() usage to deal with non-standard semantics in GNU libc.
 170   - Fix leak context reporting.  This bug tended to cause the number of contexts
 171     to be underreported (though the reported number of objects and bytes were
 172     correct).
 173   - Fix a realloc() bug for large in-place growing reallocation.  This bug could
 174     cause memory corruption, but it was hard to trigger.
 175   - Fix an allocation bug for small allocations that could be triggered if
 176     multiple threads raced to create a new run of backing pages.
 177   - Enhance the heap profiler to trigger samples based on usable size, rather
 178     than request size.
 179   - Fix a heap profiling bug due to sometimes losing track of requested object
 180     size for sampled objects.
 181
 182 * 1.0.3 (August 12, 2010)
 183
 184   Bug fixes:
 185   - Fix the libunwind-based implementation of stack backtracing (used for heap
 186     profiling).  This bug could cause zero-length backtraces to be reported.
 187   - Add a missing mutex unlock in library initialization code.  If multiple
 188     threads raced to initialize malloc, some of them could end up permanently
 189     blocked.
 190
 191 * 1.0.2 (May 11, 2010)
 192
 193   Bug fixes:
 194   - Fix junk filling of large objects, which could cause memory corruption.
 195   - Add MAP_NORESERVE support for chunk mapping, because otherwise virtual
 196     memory limits could cause swap file configuration to fail.  Contributed by
 197     Jordan DeLong.
 198
 199 * 1.0.1 (April 14, 2010)
 200
 201   Bug fixes:
 202   - Fix compilation when --enable-fill is specified.
 203   - Fix threads-related profiling bugs that affected accuracy and caused memory
 204     to be leaked during thread exit.
 205   - Fix dirty page purging race conditions that could cause crashes.
 206   - Fix crash in tcache flushing code during thread destruction.
 207
 208 * 1.0.0 (April 11, 2010)
 209
 210   This release focuses on speed and run-time introspection.  Numerous
 211   algorithmic improvements make this release substantially faster than its
 212   predecessors.
 213
 214   New features:
 215   - Implement autoconf-based configuration system.
 216   - Add mallctl*(), for the purposes of introspection and run-time
 217     configuration.
 218   - Make it possible for the application to manually flush a thread's cache, via
 219     the "tcache.flush" mallctl.
 220   - Base maximum dirty page count on proportion of active memory.
 221   - Compute various addtional run-time statistics, including per size class
 222     statistics for large objects.
 223   - Expose malloc_stats_print(), which can be called repeatedly by the
 224     application.
 225   - Simplify the malloc_message() signature to only take one string argument,
 226     and incorporate an opaque data pointer argument for use by the application
 227     in combination with malloc_stats_print().
 228   - Add support for allocation backed by one or more swap files, and allow the
 229     application to disable over-commit if swap files are in use.
 230   - Implement allocation profiling and leak checking.
 231
 232   Removed features:
 233   - Remove the dynamic arena rebalancing code, since thread-specific caching
 234     reduces its utility.
 235
 236   Bug fixes:
 237   - Modify chunk allocation to work when address space layout randomization
 238     (ASLR) is in use.
 239   - Fix thread cleanup bugs related to TLS destruction.
 240   - Handle 0-size allocation requests in posix_memalign().
 241   - Fix a chunk leak.  The leaked chunks were never touched, so this impacted
 242     virtual memory usage, but not physical memory usage.
 243
 244 * linux_2008082[78]a (August 27/28, 2008)
 245
 246   These snapshot releases are the simple result of incorporating Linux-specific
 247   support into the FreeBSD malloc sources.
 248
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