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memory/jemalloc/src/ChangeLog
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| 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 * 3.x.x (Not yet released) | |
| 10 | |
| 11 Bug fixes: | |
| 12 - Fix "arenas.extend" mallctl to output the number of arenas. | |
| 13 | |
| 14 * 3.2.0 (November 9, 2012) | |
| 15 | |
| 16 In addition to a couple of bug fixes, this version modifies page run | |
| 17 allocation and dirty page purging algorithms in order to better control | |
| 18 page-level virtual memory fragmentation. | |
| 19 | |
| 20 Incompatible changes: | |
| 21 - Change the "opt.lg_dirty_mult" default from 5 to 3 (32:1 to 8:1). | |
| 22 | |
| 23 Bug fixes: | |
| 24 - Fix dss/mmap allocation precedence code to use recyclable mmap memory only | |
| 25 after primary dss allocation fails. | |
| 26 - Fix deadlock in the "arenas.purge" mallctl. This regression was introduced | |
| 27 in 3.1.0 by the addition of the "arena.<i>.purge" mallctl. | |
| 28 | |
| 29 * 3.1.0 (October 16, 2012) | |
| 30 | |
| 31 New features: | |
| 32 - Auto-detect whether running inside Valgrind, thus removing the need to | |
| 33 manually specify MALLOC_CONF=valgrind:true. | |
| 34 - Add the "arenas.extend" mallctl, which allows applications to create | |
| 35 manually managed arenas. | |
| 36 - Add the ALLOCM_ARENA() flag for {,r,d}allocm(). | |
| 37 - Add the "opt.dss", "arena.<i>.dss", and "stats.arenas.<i>.dss" mallctls, | |
| 38 which provide control over dss/mmap precedence. | |
| 39 - Add the "arena.<i>.purge" mallctl, which obsoletes "arenas.purge". | |
| 40 - Define LG_QUANTUM for hppa. | |
| 41 | |
| 42 Incompatible changes: | |
| 43 - Disable tcache by default if running inside Valgrind, in order to avoid | |
| 44 making unallocated objects appear reachable to Valgrind. | |
| 45 - Drop const from malloc_usable_size() argument on Linux. | |
| 46 | |
| 47 Bug fixes: | |
| 48 - Fix heap profiling crash if sampled object is freed via realloc(p, 0). | |
| 49 - Remove const from __*_hook variable declarations, so that glibc can modify | |
| 50 them during process forking. | |
| 51 - Fix mlockall(2)/madvise(2) interaction. | |
| 52 - Fix fork(2)-related deadlocks. | |
| 53 - Fix error return value for "thread.tcache.enabled" mallctl. | |
| 54 | |
| 55 * 3.0.0 (May 11, 2012) | |
| 56 | |
| 57 Although this version adds some major new features, the primary focus is on | |
| 58 internal code cleanup that facilitates maintainability and portability, most | |
| 59 of which is not reflected in the ChangeLog. This is the first release to | |
| 60 incorporate substantial contributions from numerous other developers, and the | |
| 61 result is a more broadly useful allocator (see the git revision history for | |
| 62 contribution details). Note that the license has been unified, thanks to | |
| 63 Facebook granting a license under the same terms as the other copyright | |
| 64 holders (see COPYING). | |
| 65 | |
| 66 New features: | |
| 67 - Implement Valgrind support, redzones, and quarantine. | |
| 68 - Add support for additional platforms: | |
| 69 + FreeBSD | |
| 70 + Mac OS X Lion | |
| 71 + MinGW | |
| 72 + Windows (no support yet for replacing the system malloc) | |
| 73 - Add support for additional architectures: | |
| 74 + MIPS | |
| 75 + SH4 | |
| 76 + Tilera | |
| 77 - Add support for cross compiling. | |
| 78 - Add nallocm(), which rounds a request size up to the nearest size class | |
| 79 without actually allocating. | |
| 80 - Implement aligned_alloc() (blame C11). | |
| 81 - Add the "thread.tcache.enabled" mallctl. | |
| 82 - Add the "opt.prof_final" mallctl. | |
| 83 - Update pprof (from gperftools 2.0). | |
| 84 - Add the --with-mangling option. | |
| 85 - Add the --disable-experimental option. | |
| 86 - Add the --disable-munmap option, and make it the default on Linux. | |
| 87 - Add the --enable-mremap option, which disables use of mremap(2) by default. | |
| 88 | |
| 89 Incompatible changes: | |
| 90 - Enable stats by default. | |
| 91 - Enable fill by default. | |
| 92 - Disable lazy locking by default. | |
| 93 - Rename the "tcache.flush" mallctl to "thread.tcache.flush". | |
| 94 - Rename the "arenas.pagesize" mallctl to "arenas.page". | |
| 95 - Change the "opt.lg_prof_sample" default from 0 to 19 (1 B to 512 KiB). | |
| 96 - Change the "opt.prof_accum" default from true to false. | |
| 97 | |
| 98 Removed features: | |
| 99 - Remove the swap feature, including the "config.swap", "swap.avail", | |
| 100 "swap.prezeroed", "swap.nfds", and "swap.fds" mallctls. | |
| 101 - Remove highruns statistics, including the | |
| 102 "stats.arenas.<i>.bins.<j>.highruns" and | |
| 103 "stats.arenas.<i>.lruns.<j>.highruns" mallctls. | |
| 104 - As part of small size class refactoring, remove the "opt.lg_[qc]space_max", | |
| 105 "arenas.cacheline", "arenas.subpage", "arenas.[tqcs]space_{min,max}", and | |
| 106 "arenas.[tqcs]bins" mallctls. | |
| 107 - Remove the "arenas.chunksize" mallctl. | |
| 108 - Remove the "opt.lg_prof_tcmax" option. | |
| 109 - Remove the "opt.lg_prof_bt_max" option. | |
| 110 - Remove the "opt.lg_tcache_gc_sweep" option. | |
| 111 - Remove the --disable-tiny option, including the "config.tiny" mallctl. | |
| 112 - Remove the --enable-dynamic-page-shift configure option. | |
| 113 - Remove the --enable-sysv configure option. | |
| 114 | |
| 115 Bug fixes: | |
| 116 - Fix a statistics-related bug in the "thread.arena" mallctl that could cause | |
| 117 invalid statistics and crashes. | |
| 118 - Work around TLS deallocation via free() on Linux. This bug could cause | |
| 119 write-after-free memory corruption. | |
| 120 - Fix a potential deadlock that could occur during interval- and | |
| 121 growth-triggered heap profile dumps. | |
| 122 - Fix large calloc() zeroing bugs due to dropping chunk map unzeroed flags. | |
| 123 - Fix chunk_alloc_dss() to stop claiming memory is zeroed. This bug could | |
| 124 cause memory corruption and crashes with --enable-dss specified. | |
| 125 - Fix fork-related bugs that could cause deadlock in children between fork | |
| 126 and exec. | |
| 127 - Fix malloc_stats_print() to honor 'b' and 'l' in the opts parameter. | |
| 128 - Fix realloc(p, 0) to act like free(p). | |
| 129 - Do not enforce minimum alignment in memalign(). | |
| 130 - Check for NULL pointer in malloc_usable_size(). | |
| 131 - Fix an off-by-one heap profile statistics bug that could be observed in | |
| 132 interval- and growth-triggered heap profiles. | |
| 133 - Fix the "epoch" mallctl to update cached stats even if the passed in epoch | |
| 134 is 0. | |
| 135 - Fix bin->runcur management to fix a layout policy bug. This bug did not | |
| 136 affect correctness. | |
| 137 - Fix a bug in choose_arena_hard() that potentially caused more arenas to be | |
| 138 initialized than necessary. | |
| 139 - Add missing "opt.lg_tcache_max" mallctl implementation. | |
| 140 - Use glibc allocator hooks to make mixed allocator usage less likely. | |
| 141 - Fix build issues for --disable-tcache. | |
| 142 - Don't mangle pthread_create() when --with-private-namespace is specified. | |
| 143 | |
| 144 * 2.2.5 (November 14, 2011) | |
| 145 | |
| 146 Bug fixes: | |
| 147 - Fix huge_ralloc() race when using mremap(2). This is a serious bug that | |
| 148 could cause memory corruption and/or crashes. | |
| 149 - Fix huge_ralloc() to maintain chunk statistics. | |
| 150 - Fix malloc_stats_print(..., "a") output. | |
| 151 | |
| 152 * 2.2.4 (November 5, 2011) | |
| 153 | |
| 154 Bug fixes: | |
| 155 - Initialize arenas_tsd before using it. This bug existed for 2.2.[0-3], as | |
| 156 well as for --disable-tls builds in earlier releases. | |
| 157 - Do not assume a 4 KiB page size in test/rallocm.c. | |
| 158 | |
| 159 * 2.2.3 (August 31, 2011) | |
| 160 | |
| 161 This version fixes numerous bugs related to heap profiling. | |
| 162 | |
| 163 Bug fixes: | |
| 164 - Fix a prof-related race condition. This bug could cause memory corruption, | |
| 165 but only occurred in non-default configurations (prof_accum:false). | |
| 166 - Fix off-by-one backtracing issues (make sure that prof_alloc_prep() is | |
| 167 excluded from backtraces). | |
| 168 - Fix a prof-related bug in realloc() (only triggered by OOM errors). | |
| 169 - Fix prof-related bugs in allocm() and rallocm(). | |
| 170 - Fix prof_tdata_cleanup() for --disable-tls builds. | |
| 171 - Fix a relative include path, to fix objdir builds. | |
| 172 | |
| 173 * 2.2.2 (July 30, 2011) | |
| 174 | |
| 175 Bug fixes: | |
| 176 - Fix a build error for --disable-tcache. | |
| 177 - Fix assertions in arena_purge() (for real this time). | |
| 178 - Add the --with-private-namespace option. This is a workaround for symbol | |
| 179 conflicts that can inadvertently arise when using static libraries. | |
| 180 | |
| 181 * 2.2.1 (March 30, 2011) | |
| 182 | |
| 183 Bug fixes: | |
| 184 - Implement atomic operations for x86/x64. This fixes compilation failures | |
| 185 for versions of gcc that are still in wide use. | |
| 186 - Fix an assertion in arena_purge(). | |
| 187 | |
| 188 * 2.2.0 (March 22, 2011) | |
| 189 | |
| 190 This version incorporates several improvements to algorithms and data | |
| 191 structures that tend to reduce fragmentation and increase speed. | |
| 192 | |
| 193 New features: | |
| 194 - Add the "stats.cactive" mallctl. | |
| 195 - Update pprof (from google-perftools 1.7). | |
| 196 - Improve backtracing-related configuration logic, and add the | |
| 197 --disable-prof-libgcc option. | |
| 198 | |
| 199 Bug fixes: | |
| 200 - Change default symbol visibility from "internal", to "hidden", which | |
| 201 decreases the overhead of library-internal function calls. | |
| 202 - Fix symbol visibility so that it is also set on OS X. | |
| 203 - Fix a build dependency regression caused by the introduction of the .pic.o | |
| 204 suffix for PIC object files. | |
| 205 - Add missing checks for mutex initialization failures. | |
| 206 - Don't use libgcc-based backtracing except on x64, where it is known to work. | |
| 207 - Fix deadlocks on OS X that were due to memory allocation in | |
| 208 pthread_mutex_lock(). | |
| 209 - Heap profiling-specific fixes: | |
| 210 + Fix memory corruption due to integer overflow in small region index | |
| 211 computation, when using a small enough sample interval that profiling | |
| 212 context pointers are stored in small run headers. | |
| 213 + Fix a bootstrap ordering bug that only occurred with TLS disabled. | |
| 214 + Fix a rallocm() rsize bug. | |
| 215 + Fix error detection bugs for aligned memory allocation. | |
| 216 | |
| 217 * 2.1.3 (March 14, 2011) | |
| 218 | |
| 219 Bug fixes: | |
| 220 - Fix a cpp logic regression (due to the "thread.{de,}allocatedp" mallctl fix | |
| 221 for OS X in 2.1.2). | |
| 222 - Fix a "thread.arena" mallctl bug. | |
| 223 - Fix a thread cache stats merging bug. | |
| 224 | |
| 225 * 2.1.2 (March 2, 2011) | |
| 226 | |
| 227 Bug fixes: | |
| 228 - Fix "thread.{de,}allocatedp" mallctl for OS X. | |
| 229 - Add missing jemalloc.a to build system. | |
| 230 | |
| 231 * 2.1.1 (January 31, 2011) | |
| 232 | |
| 233 Bug fixes: | |
| 234 - Fix aligned huge reallocation (affected allocm()). | |
| 235 - Fix the ALLOCM_LG_ALIGN macro definition. | |
| 236 - Fix a heap dumping deadlock. | |
| 237 - Fix a "thread.arena" mallctl bug. | |
| 238 | |
| 239 * 2.1.0 (December 3, 2010) | |
| 240 | |
| 241 This version incorporates some optimizations that can't quite be considered | |
| 242 bug fixes. | |
| 243 | |
| 244 New features: | |
| 245 - Use Linux's mremap(2) for huge object reallocation when possible. | |
| 246 - Avoid locking in mallctl*() when possible. | |
| 247 - Add the "thread.[de]allocatedp" mallctl's. | |
| 248 - Convert the manual page source from roff to DocBook, and generate both roff | |
| 249 and HTML manuals. | |
| 250 | |
| 251 Bug fixes: | |
| 252 - Fix a crash due to incorrect bootstrap ordering. This only impacted | |
| 253 --enable-debug --enable-dss configurations. | |
| 254 - Fix a minor statistics bug for mallctl("swap.avail", ...). | |
| 255 | |
| 256 * 2.0.1 (October 29, 2010) | |
| 257 | |
| 258 Bug fixes: | |
| 259 - Fix a race condition in heap profiling that could cause undefined behavior | |
| 260 if "opt.prof_accum" were disabled. | |
| 261 - Add missing mutex unlocks for some OOM error paths in the heap profiling | |
| 262 code. | |
| 263 - Fix a compilation error for non-C99 builds. | |
| 264 | |
| 265 * 2.0.0 (October 24, 2010) | |
| 266 | |
| 267 This version focuses on the experimental *allocm() API, and on improved | |
| 268 run-time configuration/introspection. Nonetheless, numerous performance | |
| 269 improvements are also included. | |
| 270 | |
| 271 New features: | |
| 272 - Implement the experimental {,r,s,d}allocm() API, which provides a superset | |
| 273 of the functionality available via malloc(), calloc(), posix_memalign(), | |
| 274 realloc(), malloc_usable_size(), and free(). These functions can be used to | |
| 275 allocate/reallocate aligned zeroed memory, ask for optional extra memory | |
| 276 during reallocation, prevent object movement during reallocation, etc. | |
| 277 - Replace JEMALLOC_OPTIONS/JEMALLOC_PROF_PREFIX with MALLOC_CONF, which is | |
| 278 more human-readable, and more flexible. For example: | |
| 279 JEMALLOC_OPTIONS=AJP | |
| 280 is now: | |
| 281 MALLOC_CONF=abort:true,fill:true,stats_print:true | |
| 282 - Port to Apple OS X. Sponsored by Mozilla. | |
| 283 - Make it possible for the application to control thread-->arena mappings via | |
| 284 the "thread.arena" mallctl. | |
| 285 - Add compile-time support for all TLS-related functionality via pthreads TSD. | |
| 286 This is mainly of interest for OS X, which does not support TLS, but has a | |
| 287 TSD implementation with similar performance. | |
| 288 - Override memalign() and valloc() if they are provided by the system. | |
| 289 - Add the "arenas.purge" mallctl, which can be used to synchronously purge all | |
| 290 dirty unused pages. | |
| 291 - Make cumulative heap profiling data optional, so that it is possible to | |
| 292 limit the amount of memory consumed by heap profiling data structures. | |
| 293 - Add per thread allocation counters that can be accessed via the | |
| 294 "thread.allocated" and "thread.deallocated" mallctls. | |
| 295 | |
| 296 Incompatible changes: | |
| 297 - Remove JEMALLOC_OPTIONS and malloc_options (see MALLOC_CONF above). | |
| 298 - Increase default backtrace depth from 4 to 128 for heap profiling. | |
| 299 - Disable interval-based profile dumps by default. | |
| 300 | |
| 301 Bug fixes: | |
| 302 - Remove bad assertions in fork handler functions. These assertions could | |
| 303 cause aborts for some combinations of configure settings. | |
| 304 - Fix strerror_r() usage to deal with non-standard semantics in GNU libc. | |
| 305 - Fix leak context reporting. This bug tended to cause the number of contexts | |
| 306 to be underreported (though the reported number of objects and bytes were | |
| 307 correct). | |
| 308 - Fix a realloc() bug for large in-place growing reallocation. This bug could | |
| 309 cause memory corruption, but it was hard to trigger. | |
| 310 - Fix an allocation bug for small allocations that could be triggered if | |
| 311 multiple threads raced to create a new run of backing pages. | |
| 312 - Enhance the heap profiler to trigger samples based on usable size, rather | |
| 313 than request size. | |
| 314 - Fix a heap profiling bug due to sometimes losing track of requested object | |
| 315 size for sampled objects. | |
| 316 | |
| 317 * 1.0.3 (August 12, 2010) | |
| 318 | |
| 319 Bug fixes: | |
| 320 - Fix the libunwind-based implementation of stack backtracing (used for heap | |
| 321 profiling). This bug could cause zero-length backtraces to be reported. | |
| 322 - Add a missing mutex unlock in library initialization code. If multiple | |
| 323 threads raced to initialize malloc, some of them could end up permanently | |
| 324 blocked. | |
| 325 | |
| 326 * 1.0.2 (May 11, 2010) | |
| 327 | |
| 328 Bug fixes: | |
| 329 - Fix junk filling of large objects, which could cause memory corruption. | |
| 330 - Add MAP_NORESERVE support for chunk mapping, because otherwise virtual | |
| 331 memory limits could cause swap file configuration to fail. Contributed by | |
| 332 Jordan DeLong. | |
| 333 | |
| 334 * 1.0.1 (April 14, 2010) | |
| 335 | |
| 336 Bug fixes: | |
| 337 - Fix compilation when --enable-fill is specified. | |
| 338 - Fix threads-related profiling bugs that affected accuracy and caused memory | |
| 339 to be leaked during thread exit. | |
| 340 - Fix dirty page purging race conditions that could cause crashes. | |
| 341 - Fix crash in tcache flushing code during thread destruction. | |
| 342 | |
| 343 * 1.0.0 (April 11, 2010) | |
| 344 | |
| 345 This release focuses on speed and run-time introspection. Numerous | |
| 346 algorithmic improvements make this release substantially faster than its | |
| 347 predecessors. | |
| 348 | |
| 349 New features: | |
| 350 - Implement autoconf-based configuration system. | |
| 351 - Add mallctl*(), for the purposes of introspection and run-time | |
| 352 configuration. | |
| 353 - Make it possible for the application to manually flush a thread's cache, via | |
| 354 the "tcache.flush" mallctl. | |
| 355 - Base maximum dirty page count on proportion of active memory. | |
| 356 - Compute various addtional run-time statistics, including per size class | |
| 357 statistics for large objects. | |
| 358 - Expose malloc_stats_print(), which can be called repeatedly by the | |
| 359 application. | |
| 360 - Simplify the malloc_message() signature to only take one string argument, | |
| 361 and incorporate an opaque data pointer argument for use by the application | |
| 362 in combination with malloc_stats_print(). | |
| 363 - Add support for allocation backed by one or more swap files, and allow the | |
| 364 application to disable over-commit if swap files are in use. | |
| 365 - Implement allocation profiling and leak checking. | |
| 366 | |
| 367 Removed features: | |
| 368 - Remove the dynamic arena rebalancing code, since thread-specific caching | |
| 369 reduces its utility. | |
| 370 | |
| 371 Bug fixes: | |
| 372 - Modify chunk allocation to work when address space layout randomization | |
| 373 (ASLR) is in use. | |
| 374 - Fix thread cleanup bugs related to TLS destruction. | |
| 375 - Handle 0-size allocation requests in posix_memalign(). | |
| 376 - Fix a chunk leak. The leaked chunks were never touched, so this impacted | |
| 377 virtual memory usage, but not physical memory usage. | |
| 378 | |
| 379 * linux_2008082[78]a (August 27/28, 2008) | |
| 380 | |
| 381 These snapshot releases are the simple result of incorporating Linux-specific | |
| 382 support into the FreeBSD malloc sources. | |
| 383 | |
| 384 -------------------------------------------------------------------------------- | |
| 385 vim:filetype=text:textwidth=80 |
