1Following are change highlights associated with official releases. Important 2bug fixes are all mentioned, but some internal enhancements are omitted here for 3brevity. Much more detail can be found in the git revision history: 4 5 https://github.com/jemalloc/jemalloc 6 7* 4.0.3 (September 24, 2015) 8 9 This bugfix release continues the trend of xallocx() and heap profiling fixes. 10 11 Bug fixes: 12 - Fix xallocx(..., MALLOCX_ZERO) to zero all trailing bytes of large 13 allocations when --enable-cache-oblivious configure option is enabled. 14 - Fix xallocx(..., MALLOCX_ZERO) to zero trailing bytes of huge allocations 15 when resizing from/to a size class that is not a multiple of the chunk size. 16 - Fix prof_tctx_dump_iter() to filter out nodes that were created after heap 17 profile dumping started. 18 - Work around a potentially bad thread-specific data initialization 19 interaction with NPTL (glibc's pthreads implementation). 20 21* 4.0.2 (September 21, 2015) 22 23 This bugfix release addresses a few bugs specific to heap profiling. 24 25 Bug fixes: 26 - Fix ixallocx_prof_sample() to never modify nor create sampled small 27 allocations. xallocx() is in general incapable of moving small allocations, 28 so this fix removes buggy code without loss of generality. 29 - Fix irallocx_prof_sample() to always allocate large regions, even when 30 alignment is non-zero. 31 - Fix prof_alloc_rollback() to read tdata from thread-specific data rather 32 than dereferencing a potentially invalid tctx. 33 34* 4.0.1 (September 15, 2015) 35 36 This is a bugfix release that is somewhat high risk due to the amount of 37 refactoring required to address deep xallocx() problems. As a side effect of 38 these fixes, xallocx() now tries harder to partially fulfill requests for 39 optional extra space. Note that a couple of minor heap profiling 40 optimizations are included, but these are better thought of as performance 41 fixes that were integral to disovering most of the other bugs. 42 43 Optimizations: 44 - Avoid a chunk metadata read in arena_prof_tctx_set(), since it is in the 45 fast path when heap profiling is enabled. Additionally, split a special 46 case out into arena_prof_tctx_reset(), which also avoids chunk metadata 47 reads. 48 - Optimize irallocx_prof() to optimistically update the sampler state. The 49 prior implementation appears to have been a holdover from when 50 rallocx()/xallocx() functionality was combined as rallocm(). 51 52 Bug fixes: 53 - Fix TLS configuration such that it is enabled by default for platforms on 54 which it works correctly. 55 - Fix arenas_cache_cleanup() and arena_get_hard() to handle 56 allocation/deallocation within the application's thread-specific data 57 cleanup functions even after arenas_cache is torn down. 58 - Fix xallocx() bugs related to size+extra exceeding HUGE_MAXCLASS. 59 - Fix chunk purge hook calls for in-place huge shrinking reallocation to 60 specify the old chunk size rather than the new chunk size. This bug caused 61 no correctness issues for the default chunk purge function, but was 62 visible to custom functions set via the "arena.<i>.chunk_hooks" mallctl. 63 - Fix heap profiling bugs: 64 + Fix heap profiling to distinguish among otherwise identical sample sites 65 with interposed resets (triggered via the "prof.reset" mallctl). This bug 66 could cause data structure corruption that would most likely result in a 67 segfault. 68 + Fix irealloc_prof() to prof_alloc_rollback() on OOM. 69 + Make one call to prof_active_get_unlocked() per allocation event, and use 70 the result throughout the relevant functions that handle an allocation 71 event. Also add a missing check in prof_realloc(). These fixes protect 72 allocation events against concurrent prof_active changes. 73 + Fix ixallocx_prof() to pass usize_max and zero to ixallocx_prof_sample() 74 in the correct order. 75 + Fix prof_realloc() to call prof_free_sampled_object() after calling 76 prof_malloc_sample_object(). Prior to this fix, if tctx and old_tctx were 77 the same, the tctx could have been prematurely destroyed. 78 - Fix portability bugs: 79 + Don't bitshift by negative amounts when encoding/decoding run sizes in 80 chunk header maps. This affected systems with page sizes greater than 8 81 KiB. 82 + Rename index_t to szind_t to avoid an existing type on Solaris. 83 + Add JEMALLOC_CXX_THROW to the memalign() function prototype, in order to 84 match glibc and avoid compilation errors when including both 85 jemalloc/jemalloc.h and malloc.h in C++ code. 86 + Don't assume that /bin/sh is appropriate when running size_classes.sh 87 during configuration. 88 + Consider __sparcv9 a synonym for __sparc64__ when defining LG_QUANTUM. 89 + Link tests to librt if it contains clock_gettime(2). 90 91* 4.0.0 (August 17, 2015) 92 93 This version contains many speed and space optimizations, both minor and 94 major. The major themes are generalization, unification, and simplification. 95 Although many of these optimizations cause no visible behavior change, their 96 cumulative effect is substantial. 97 98 New features: 99 - Normalize size class spacing to be consistent across the complete size 100 range. By default there are four size classes per size doubling, but this 101 is now configurable via the --with-lg-size-class-group option. Also add the 102 --with-lg-page, --with-lg-page-sizes, --with-lg-quantum, and 103 --with-lg-tiny-min options, which can be used to tweak page and size class 104 settings. Impacts: 105 + Worst case performance for incrementally growing/shrinking reallocation 106 is improved because there are far fewer size classes, and therefore 107 copying happens less often. 108 + Internal fragmentation is limited to 20% for all but the smallest size 109 classes (those less than four times the quantum). (1B + 4 KiB) 110 and (1B + 4 MiB) previously suffered nearly 50% internal fragmentation. 111 + Chunk fragmentation tends to be lower because there are fewer distinct run 112 sizes to pack. 113 - Add support for explicit tcaches. The "tcache.create", "tcache.flush", and 114 "tcache.destroy" mallctls control tcache lifetime and flushing, and the 115 MALLOCX_TCACHE(tc) and MALLOCX_TCACHE_NONE flags to the *allocx() API 116 control which tcache is used for each operation. 117 - Implement per thread heap profiling, as well as the ability to 118 enable/disable heap profiling on a per thread basis. Add the "prof.reset", 119 "prof.lg_sample", "thread.prof.name", "thread.prof.active", 120 "opt.prof_thread_active_init", "prof.thread_active_init", and 121 "thread.prof.active" mallctls. 122 - Add support for per arena application-specified chunk allocators, configured 123 via the "arena.<i>.chunk_hooks" mallctl. 124 - Refactor huge allocation to be managed by arenas, so that arenas now 125 function as general purpose independent allocators. This is important in 126 the context of user-specified chunk allocators, aside from the scalability 127 benefits. Related new statistics: 128 + The "stats.arenas.<i>.huge.allocated", "stats.arenas.<i>.huge.nmalloc", 129 "stats.arenas.<i>.huge.ndalloc", and "stats.arenas.<i>.huge.nrequests" 130 mallctls provide high level per arena huge allocation statistics. 131 + The "arenas.nhchunks", "arenas.hchunk.<i>.size", 132 "stats.arenas.<i>.hchunks.<j>.nmalloc", 133 "stats.arenas.<i>.hchunks.<j>.ndalloc", 134 "stats.arenas.<i>.hchunks.<j>.nrequests", and 135 "stats.arenas.<i>.hchunks.<j>.curhchunks" mallctls provide per size class 136 statistics. 137 - Add the 'util' column to malloc_stats_print() output, which reports the 138 proportion of available regions that are currently in use for each small 139 size class. 140 - Add "alloc" and "free" modes for for junk filling (see the "opt.junk" 141 mallctl), so that it is possible to separately enable junk filling for 142 allocation versus deallocation. 143 - Add the jemalloc-config script, which provides information about how 144 jemalloc was configured, and how to integrate it into application builds. 145 - Add metadata statistics, which are accessible via the "stats.metadata", 146 "stats.arenas.<i>.metadata.mapped", and 147 "stats.arenas.<i>.metadata.allocated" mallctls. 148 - Add the "stats.resident" mallctl, which reports the upper limit of 149 physically resident memory mapped by the allocator. 150 - Add per arena control over unused dirty page purging, via the 151 "arenas.lg_dirty_mult", "arena.<i>.lg_dirty_mult", and 152 "stats.arenas.<i>.lg_dirty_mult" mallctls. 153 - Add the "prof.gdump" mallctl, which makes it possible to toggle the gdump 154 feature on/off during program execution. 155 - Add sdallocx(), which implements sized deallocation. The primary 156 optimization over dallocx() is the removal of a metadata read, which often 157 suffers an L1 cache miss. 158 - Add missing header includes in jemalloc/jemalloc.h, so that applications 159 only have to #include <jemalloc/jemalloc.h>. 160 - Add support for additional platforms: 161 + Bitrig 162 + Cygwin 163 + DragonFlyBSD 164 + iOS 165 + OpenBSD 166 + OpenRISC/or1k 167 168 Optimizations: 169 - Maintain dirty runs in per arena LRUs rather than in per arena trees of 170 dirty-run-containing chunks. In practice this change significantly reduces 171 dirty page purging volume. 172 - Integrate whole chunks into the unused dirty page purging machinery. This 173 reduces the cost of repeated huge allocation/deallocation, because it 174 effectively introduces a cache of chunks. 175 - Split the arena chunk map into two separate arrays, in order to increase 176 cache locality for the frequently accessed bits. 177 - Move small run metadata out of runs, into arena chunk headers. This reduces 178 run fragmentation, smaller runs reduce external fragmentation for small size 179 classes, and packed (less uniformly aligned) metadata layout improves CPU 180 cache set distribution. 181 - Randomly distribute large allocation base pointer alignment relative to page 182 boundaries in order to more uniformly utilize CPU cache sets. This can be 183 disabled via the --disable-cache-oblivious configure option, and queried via 184 the "config.cache_oblivious" mallctl. 185 - Micro-optimize the fast paths for the public API functions. 186 - Refactor thread-specific data to reside in a single structure. This assures 187 that only a single TLS read is necessary per call into the public API. 188 - Implement in-place huge allocation growing and shrinking. 189 - Refactor rtree (radix tree for chunk lookups) to be lock-free, and make 190 additional optimizations that reduce maximum lookup depth to one or two 191 levels. This resolves what was a concurrency bottleneck for per arena huge 192 allocation, because a global data structure is critical for determining 193 which arenas own which huge allocations. 194 195 Incompatible changes: 196 - Replace --enable-cc-silence with --disable-cc-silence to suppress spurious 197 warnings by default. 198 - Assure that the constness of malloc_usable_size()'s return type matches that 199 of the system implementation. 200 - Change the heap profile dump format to support per thread heap profiling, 201 rename pprof to jeprof, and enhance it with the --thread=<n> option. As a 202 result, the bundled jeprof must now be used rather than the upstream 203 (gperftools) pprof. 204 - Disable "opt.prof_final" by default, in order to avoid atexit(3), which can 205 internally deadlock on some platforms. 206 - Change the "arenas.nlruns" mallctl type from size_t to unsigned. 207 - Replace the "stats.arenas.<i>.bins.<j>.allocated" mallctl with 208 "stats.arenas.<i>.bins.<j>.curregs". 209 - Ignore MALLOC_CONF in set{uid,gid,cap} binaries. 210 - Ignore MALLOCX_ARENA(a) in dallocx(), in favor of using the 211 MALLOCX_TCACHE(tc) and MALLOCX_TCACHE_NONE flags to control tcache usage. 212 213 Removed features: 214 - Remove the *allocm() API, which is superseded by the *allocx() API. 215 - Remove the --enable-dss options, and make dss non-optional on all platforms 216 which support sbrk(2). 217 - Remove the "arenas.purge" mallctl, which was obsoleted by the 218 "arena.<i>.purge" mallctl in 3.1.0. 219 - Remove the unnecessary "opt.valgrind" mallctl; jemalloc automatically 220 detects whether it is running inside Valgrind. 221 - Remove the "stats.huge.allocated", "stats.huge.nmalloc", and 222 "stats.huge.ndalloc" mallctls. 223 - Remove the --enable-mremap option. 224 - Remove the "stats.chunks.current", "stats.chunks.total", and 225 "stats.chunks.high" mallctls. 226 227 Bug fixes: 228 - Fix the cactive statistic to decrease (rather than increase) when active 229 memory decreases. This regression was first released in 3.5.0. 230 - Fix OOM handling in memalign() and valloc(). A variant of this bug existed 231 in all releases since 2.0.0, which introduced these functions. 232 - Fix an OOM-related regression in arena_tcache_fill_small(), which could 233 cause cache corruption on OOM. This regression was present in all releases 234 from 2.2.0 through 3.6.0. 235 - Fix size class overflow handling for malloc(), posix_memalign(), memalign(), 236 calloc(), and realloc() when profiling is enabled. 237 - Fix the "arena.<i>.dss" mallctl to return an error if "primary" or 238 "secondary" precedence is specified, but sbrk(2) is not supported. 239 - Fix fallback lg_floor() implementations to handle extremely large inputs. 240 - Ensure the default purgeable zone is after the default zone on OS X. 241 - Fix latent bugs in atomic_*(). 242 - Fix the "arena.<i>.dss" mallctl to handle read-only calls. 243 - Fix tls_model configuration to enable the initial-exec model when possible. 244 - Mark malloc_conf as a weak symbol so that the application can override it. 245 - Correctly detect glibc's adaptive pthread mutexes. 246 - Fix the --without-export configure option. 247 248* 3.6.0 (March 31, 2014) 249 250 This version contains a critical bug fix for a regression present in 3.5.0 and 251 3.5.1. 252 253 Bug fixes: 254 - Fix a regression in arena_chunk_alloc() that caused crashes during 255 small/large allocation if chunk allocation failed. In the absence of this 256 bug, chunk allocation failure would result in allocation failure, e.g. NULL 257 return from malloc(). This regression was introduced in 3.5.0. 258 - Fix backtracing for gcc intrinsics-based backtracing by specifying 259 -fno-omit-frame-pointer to gcc. Note that the application (and all the 260 libraries it links to) must also be compiled with this option for 261 backtracing to be reliable. 262 - Use dss allocation precedence for huge allocations as well as small/large 263 allocations. 264 - Fix test assertion failure message formatting. This bug did not manifest on 265 x86_64 systems because of implementation subtleties in va_list. 266 - Fix inconsequential test failures for hash and SFMT code. 267 268 New features: 269 - Support heap profiling on FreeBSD. This feature depends on the proc 270 filesystem being mounted during heap profile dumping. 271 272* 3.5.1 (February 25, 2014) 273 274 This version primarily addresses minor bugs in test code. 275 276 Bug fixes: 277 - Configure Solaris/Illumos to use MADV_FREE. 278 - Fix junk filling for mremap(2)-based huge reallocation. This is only 279 relevant if configuring with the --enable-mremap option specified. 280 - Avoid compilation failure if 'restrict' C99 keyword is not supported by the 281 compiler. 282 - Add a configure test for SSE2 rather than assuming it is usable on i686 283 systems. This fixes test compilation errors, especially on 32-bit Linux 284 systems. 285 - Fix mallctl argument size mismatches (size_t vs. uint64_t) in the stats unit 286 test. 287 - Fix/remove flawed alignment-related overflow tests. 288 - Prevent compiler optimizations that could change backtraces in the 289 prof_accum unit test. 290 291* 3.5.0 (January 22, 2014) 292 293 This version focuses on refactoring and automated testing, though it also 294 includes some non-trivial heap profiling optimizations not mentioned below. 295 296 New features: 297 - Add the *allocx() API, which is a successor to the experimental *allocm() 298 API. The *allocx() functions are slightly simpler to use because they have 299 fewer parameters, they directly return the results of primary interest, and 300 mallocx()/rallocx() avoid the strict aliasing pitfall that 301 allocm()/rallocm() share with posix_memalign(). Note that *allocm() is 302 slated for removal in the next non-bugfix release. 303 - Add support for LinuxThreads. 304 305 Bug fixes: 306 - Unless heap profiling is enabled, disable floating point code and don't link 307 with libm. This, in combination with e.g. EXTRA_CFLAGS=-mno-sse on x64 308 systems, makes it possible to completely disable floating point register 309 use. Some versions of glibc neglect to save/restore caller-saved floating 310 point registers during dynamic lazy symbol loading, and the symbol loading 311 code uses whatever malloc the application happens to have linked/loaded 312 with, the result being potential floating point register corruption. 313 - Report ENOMEM rather than EINVAL if an OOM occurs during heap profiling 314 backtrace creation in imemalign(). This bug impacted posix_memalign() and 315 aligned_alloc(). 316 - Fix a file descriptor leak in a prof_dump_maps() error path. 317 - Fix prof_dump() to close the dump file descriptor for all relevant error 318 paths. 319 - Fix rallocm() to use the arena specified by the ALLOCM_ARENA(s) flag for 320 allocation, not just deallocation. 321 - Fix a data race for large allocation stats counters. 322 - Fix a potential infinite loop during thread exit. This bug occurred on 323 Solaris, and could affect other platforms with similar pthreads TSD 324 implementations. 325 - Don't junk-fill reallocations unless usable size changes. This fixes a 326 violation of the *allocx()/*allocm() semantics. 327 - Fix growing large reallocation to junk fill new space. 328 - Fix huge deallocation to junk fill when munmap is disabled. 329 - Change the default private namespace prefix from empty to je_, and change 330 --with-private-namespace-prefix so that it prepends an additional prefix 331 rather than replacing je_. This reduces the likelihood of applications 332 which statically link jemalloc experiencing symbol name collisions. 333 - Add missing private namespace mangling (relevant when 334 --with-private-namespace is specified). 335 - Add and use JEMALLOC_INLINE_C so that static inline functions are marked as 336 static even for debug builds. 337 - Add a missing mutex unlock in a malloc_init_hard() error path. In practice 338 this error path is never executed. 339 - Fix numerous bugs in malloc_strotumax() error handling/reporting. These 340 bugs had no impact except for malformed inputs. 341 - Fix numerous bugs in malloc_snprintf(). These bugs were not exercised by 342 existing calls, so they had no impact. 343 344* 3.4.1 (October 20, 2013) 345 346 Bug fixes: 347 - Fix a race in the "arenas.extend" mallctl that could cause memory corruption 348 of internal data structures and subsequent crashes. 349 - Fix Valgrind integration flaws that caused Valgrind warnings about reads of 350 uninitialized memory in: 351 + arena chunk headers 352 + internal zero-initialized data structures (relevant to tcache and prof 353 code) 354 - Preserve errno during the first allocation. A readlink(2) call during 355 initialization fails unless /etc/malloc.conf exists, so errno was typically 356 set during the first allocation prior to this fix. 357 - Fix compilation warnings reported by gcc 4.8.1. 358 359* 3.4.0 (June 2, 2013) 360 361 This version is essentially a small bugfix release, but the addition of 362 aarch64 support requires that the minor version be incremented. 363 364 Bug fixes: 365 - Fix race-triggered deadlocks in chunk_record(). These deadlocks were 366 typically triggered by multiple threads concurrently deallocating huge 367 objects. 368 369 New features: 370 - Add support for the aarch64 architecture. 371 372* 3.3.1 (March 6, 2013) 373 374 This version fixes bugs that are typically encountered only when utilizing 375 custom run-time options. 376 377 Bug fixes: 378 - Fix a locking order bug that could cause deadlock during fork if heap 379 profiling were enabled. 380 - Fix a chunk recycling bug that could cause the allocator to lose track of 381 whether a chunk was zeroed. On FreeBSD, NetBSD, and OS X, it could cause 382 corruption if allocating via sbrk(2) (unlikely unless running with the 383 "dss:primary" option specified). This was completely harmless on Linux 384 unless using mlockall(2) (and unlikely even then, unless the 385 --disable-munmap configure option or the "dss:primary" option was 386 specified). This regression was introduced in 3.1.0 by the 387 mlockall(2)/madvise(2) interaction fix. 388 - Fix TLS-related memory corruption that could occur during thread exit if the 389 thread never allocated memory. Only the quarantine and prof facilities were 390 susceptible. 391 - Fix two quarantine bugs: 392 + Internal reallocation of the quarantined object array leaked the old 393 array. 394 + Reallocation failure for internal reallocation of the quarantined object 395 array (very unlikely) resulted in memory corruption. 396 - Fix Valgrind integration to annotate all internally allocated memory in a 397 way that keeps Valgrind happy about internal data structure access. 398 - Fix building for s390 systems. 399 400* 3.3.0 (January 23, 2013) 401 402 This version includes a few minor performance improvements in addition to the 403 listed new features and bug fixes. 404 405 New features: 406 - Add clipping support to lg_chunk option processing. 407 - Add the --enable-ivsalloc option. 408 - Add the --without-export option. 409 - Add the --disable-zone-allocator option. 410 411 Bug fixes: 412 - Fix "arenas.extend" mallctl to output the number of arenas. 413 - Fix chunk_recycle() to unconditionally inform Valgrind that returned memory 414 is undefined. 415 - Fix build break on FreeBSD related to alloca.h. 416 417* 3.2.0 (November 9, 2012) 418 419 In addition to a couple of bug fixes, this version modifies page run 420 allocation and dirty page purging algorithms in order to better control 421 page-level virtual memory fragmentation. 422 423 Incompatible changes: 424 - Change the "opt.lg_dirty_mult" default from 5 to 3 (32:1 to 8:1). 425 426 Bug fixes: 427 - Fix dss/mmap allocation precedence code to use recyclable mmap memory only 428 after primary dss allocation fails. 429 - Fix deadlock in the "arenas.purge" mallctl. This regression was introduced 430 in 3.1.0 by the addition of the "arena.<i>.purge" mallctl. 431 432* 3.1.0 (October 16, 2012) 433 434 New features: 435 - Auto-detect whether running inside Valgrind, thus removing the need to 436 manually specify MALLOC_CONF=valgrind:true. 437 - Add the "arenas.extend" mallctl, which allows applications to create 438 manually managed arenas. 439 - Add the ALLOCM_ARENA() flag for {,r,d}allocm(). 440 - Add the "opt.dss", "arena.<i>.dss", and "stats.arenas.<i>.dss" mallctls, 441 which provide control over dss/mmap precedence. 442 - Add the "arena.<i>.purge" mallctl, which obsoletes "arenas.purge". 443 - Define LG_QUANTUM for hppa. 444 445 Incompatible changes: 446 - Disable tcache by default if running inside Valgrind, in order to avoid 447 making unallocated objects appear reachable to Valgrind. 448 - Drop const from malloc_usable_size() argument on Linux. 449 450 Bug fixes: 451 - Fix heap profiling crash if sampled object is freed via realloc(p, 0). 452 - Remove const from __*_hook variable declarations, so that glibc can modify 453 them during process forking. 454 - Fix mlockall(2)/madvise(2) interaction. 455 - Fix fork(2)-related deadlocks. 456 - Fix error return value for "thread.tcache.enabled" mallctl. 457 458* 3.0.0 (May 11, 2012) 459 460 Although this version adds some major new features, the primary focus is on 461 internal code cleanup that facilitates maintainability and portability, most 462 of which is not reflected in the ChangeLog. This is the first release to 463 incorporate substantial contributions from numerous other developers, and the 464 result is a more broadly useful allocator (see the git revision history for 465 contribution details). Note that the license has been unified, thanks to 466 Facebook granting a license under the same terms as the other copyright 467 holders (see COPYING). 468 469 New features: 470 - Implement Valgrind support, redzones, and quarantine. 471 - Add support for additional platforms: 472 + FreeBSD 473 + Mac OS X Lion 474 + MinGW 475 + Windows (no support yet for replacing the system malloc) 476 - Add support for additional architectures: 477 + MIPS 478 + SH4 479 + Tilera 480 - Add support for cross compiling. 481 - Add nallocm(), which rounds a request size up to the nearest size class 482 without actually allocating. 483 - Implement aligned_alloc() (blame C11). 484 - Add the "thread.tcache.enabled" mallctl. 485 - Add the "opt.prof_final" mallctl. 486 - Update pprof (from gperftools 2.0). 487 - Add the --with-mangling option. 488 - Add the --disable-experimental option. 489 - Add the --disable-munmap option, and make it the default on Linux. 490 - Add the --enable-mremap option, which disables use of mremap(2) by default. 491 492 Incompatible changes: 493 - Enable stats by default. 494 - Enable fill by default. 495 - Disable lazy locking by default. 496 - Rename the "tcache.flush" mallctl to "thread.tcache.flush". 497 - Rename the "arenas.pagesize" mallctl to "arenas.page". 498 - Change the "opt.lg_prof_sample" default from 0 to 19 (1 B to 512 KiB). 499 - Change the "opt.prof_accum" default from true to false. 500 501 Removed features: 502 - Remove the swap feature, including the "config.swap", "swap.avail", 503 "swap.prezeroed", "swap.nfds", and "swap.fds" mallctls. 504 - Remove highruns statistics, including the 505 "stats.arenas.<i>.bins.<j>.highruns" and 506 "stats.arenas.<i>.lruns.<j>.highruns" mallctls. 507 - As part of small size class refactoring, remove the "opt.lg_[qc]space_max", 508 "arenas.cacheline", "arenas.subpage", "arenas.[tqcs]space_{min,max}", and 509 "arenas.[tqcs]bins" mallctls. 510 - Remove the "arenas.chunksize" mallctl. 511 - Remove the "opt.lg_prof_tcmax" option. 512 - Remove the "opt.lg_prof_bt_max" option. 513 - Remove the "opt.lg_tcache_gc_sweep" option. 514 - Remove the --disable-tiny option, including the "config.tiny" mallctl. 515 - Remove the --enable-dynamic-page-shift configure option. 516 - Remove the --enable-sysv configure option. 517 518 Bug fixes: 519 - Fix a statistics-related bug in the "thread.arena" mallctl that could cause 520 invalid statistics and crashes. 521 - Work around TLS deallocation via free() on Linux. This bug could cause 522 write-after-free memory corruption. 523 - Fix a potential deadlock that could occur during interval- and 524 growth-triggered heap profile dumps. 525 - Fix large calloc() zeroing bugs due to dropping chunk map unzeroed flags. 526 - Fix chunk_alloc_dss() to stop claiming memory is zeroed. This bug could 527 cause memory corruption and crashes with --enable-dss specified. 528 - Fix fork-related bugs that could cause deadlock in children between fork 529 and exec. 530 - Fix malloc_stats_print() to honor 'b' and 'l' in the opts parameter. 531 - Fix realloc(p, 0) to act like free(p). 532 - Do not enforce minimum alignment in memalign(). 533 - Check for NULL pointer in malloc_usable_size(). 534 - Fix an off-by-one heap profile statistics bug that could be observed in 535 interval- and growth-triggered heap profiles. 536 - Fix the "epoch" mallctl to update cached stats even if the passed in epoch 537 is 0. 538 - Fix bin->runcur management to fix a layout policy bug. This bug did not 539 affect correctness. 540 - Fix a bug in choose_arena_hard() that potentially caused more arenas to be 541 initialized than necessary. 542 - Add missing "opt.lg_tcache_max" mallctl implementation. 543 - Use glibc allocator hooks to make mixed allocator usage less likely. 544 - Fix build issues for --disable-tcache. 545 - Don't mangle pthread_create() when --with-private-namespace is specified. 546 547* 2.2.5 (November 14, 2011) 548 549 Bug fixes: 550 - Fix huge_ralloc() race when using mremap(2). This is a serious bug that 551 could cause memory corruption and/or crashes. 552 - Fix huge_ralloc() to maintain chunk statistics. 553 - Fix malloc_stats_print(..., "a") output. 554 555* 2.2.4 (November 5, 2011) 556 557 Bug fixes: 558 - Initialize arenas_tsd before using it. This bug existed for 2.2.[0-3], as 559 well as for --disable-tls builds in earlier releases. 560 - Do not assume a 4 KiB page size in test/rallocm.c. 561 562* 2.2.3 (August 31, 2011) 563 564 This version fixes numerous bugs related to heap profiling. 565 566 Bug fixes: 567 - Fix a prof-related race condition. This bug could cause memory corruption, 568 but only occurred in non-default configurations (prof_accum:false). 569 - Fix off-by-one backtracing issues (make sure that prof_alloc_prep() is 570 excluded from backtraces). 571 - Fix a prof-related bug in realloc() (only triggered by OOM errors). 572 - Fix prof-related bugs in allocm() and rallocm(). 573 - Fix prof_tdata_cleanup() for --disable-tls builds. 574 - Fix a relative include path, to fix objdir builds. 575 576* 2.2.2 (July 30, 2011) 577 578 Bug fixes: 579 - Fix a build error for --disable-tcache. 580 - Fix assertions in arena_purge() (for real this time). 581 - Add the --with-private-namespace option. This is a workaround for symbol 582 conflicts that can inadvertently arise when using static libraries. 583 584* 2.2.1 (March 30, 2011) 585 586 Bug fixes: 587 - Implement atomic operations for x86/x64. This fixes compilation failures 588 for versions of gcc that are still in wide use. 589 - Fix an assertion in arena_purge(). 590 591* 2.2.0 (March 22, 2011) 592 593 This version incorporates several improvements to algorithms and data 594 structures that tend to reduce fragmentation and increase speed. 595 596 New features: 597 - Add the "stats.cactive" mallctl. 598 - Update pprof (from google-perftools 1.7). 599 - Improve backtracing-related configuration logic, and add the 600 --disable-prof-libgcc option. 601 602 Bug fixes: 603 - Change default symbol visibility from "internal", to "hidden", which 604 decreases the overhead of library-internal function calls. 605 - Fix symbol visibility so that it is also set on OS X. 606 - Fix a build dependency regression caused by the introduction of the .pic.o 607 suffix for PIC object files. 608 - Add missing checks for mutex initialization failures. 609 - Don't use libgcc-based backtracing except on x64, where it is known to work. 610 - Fix deadlocks on OS X that were due to memory allocation in 611 pthread_mutex_lock(). 612 - Heap profiling-specific fixes: 613 + Fix memory corruption due to integer overflow in small region index 614 computation, when using a small enough sample interval that profiling 615 context pointers are stored in small run headers. 616 + Fix a bootstrap ordering bug that only occurred with TLS disabled. 617 + Fix a rallocm() rsize bug. 618 + Fix error detection bugs for aligned memory allocation. 619 620* 2.1.3 (March 14, 2011) 621 622 Bug fixes: 623 - Fix a cpp logic regression (due to the "thread.{de,}allocatedp" mallctl fix 624 for OS X in 2.1.2). 625 - Fix a "thread.arena" mallctl bug. 626 - Fix a thread cache stats merging bug. 627 628* 2.1.2 (March 2, 2011) 629 630 Bug fixes: 631 - Fix "thread.{de,}allocatedp" mallctl for OS X. 632 - Add missing jemalloc.a to build system. 633 634* 2.1.1 (January 31, 2011) 635 636 Bug fixes: 637 - Fix aligned huge reallocation (affected allocm()). 638 - Fix the ALLOCM_LG_ALIGN macro definition. 639 - Fix a heap dumping deadlock. 640 - Fix a "thread.arena" mallctl bug. 641 642* 2.1.0 (December 3, 2010) 643 644 This version incorporates some optimizations that can't quite be considered 645 bug fixes. 646 647 New features: 648 - Use Linux's mremap(2) for huge object reallocation when possible. 649 - Avoid locking in mallctl*() when possible. 650 - Add the "thread.[de]allocatedp" mallctl's. 651 - Convert the manual page source from roff to DocBook, and generate both roff 652 and HTML manuals. 653 654 Bug fixes: 655 - Fix a crash due to incorrect bootstrap ordering. This only impacted 656 --enable-debug --enable-dss configurations. 657 - Fix a minor statistics bug for mallctl("swap.avail", ...). 658 659* 2.0.1 (October 29, 2010) 660 661 Bug fixes: 662 - Fix a race condition in heap profiling that could cause undefined behavior 663 if "opt.prof_accum" were disabled. 664 - Add missing mutex unlocks for some OOM error paths in the heap profiling 665 code. 666 - Fix a compilation error for non-C99 builds. 667 668* 2.0.0 (October 24, 2010) 669 670 This version focuses on the experimental *allocm() API, and on improved 671 run-time configuration/introspection. Nonetheless, numerous performance 672 improvements are also included. 673 674 New features: 675 - Implement the experimental {,r,s,d}allocm() API, which provides a superset 676 of the functionality available via malloc(), calloc(), posix_memalign(), 677 realloc(), malloc_usable_size(), and free(). These functions can be used to 678 allocate/reallocate aligned zeroed memory, ask for optional extra memory 679 during reallocation, prevent object movement during reallocation, etc. 680 - Replace JEMALLOC_OPTIONS/JEMALLOC_PROF_PREFIX with MALLOC_CONF, which is 681 more human-readable, and more flexible. For example: 682 JEMALLOC_OPTIONS=AJP 683 is now: 684 MALLOC_CONF=abort:true,fill:true,stats_print:true 685 - Port to Apple OS X. Sponsored by Mozilla. 686 - Make it possible for the application to control thread-->arena mappings via 687 the "thread.arena" mallctl. 688 - Add compile-time support for all TLS-related functionality via pthreads TSD. 689 This is mainly of interest for OS X, which does not support TLS, but has a 690 TSD implementation with similar performance. 691 - Override memalign() and valloc() if they are provided by the system. 692 - Add the "arenas.purge" mallctl, which can be used to synchronously purge all 693 dirty unused pages. 694 - Make cumulative heap profiling data optional, so that it is possible to 695 limit the amount of memory consumed by heap profiling data structures. 696 - Add per thread allocation counters that can be accessed via the 697 "thread.allocated" and "thread.deallocated" mallctls. 698 699 Incompatible changes: 700 - Remove JEMALLOC_OPTIONS and malloc_options (see MALLOC_CONF above). 701 - Increase default backtrace depth from 4 to 128 for heap profiling. 702 - Disable interval-based profile dumps by default. 703 704 Bug fixes: 705 - Remove bad assertions in fork handler functions. These assertions could 706 cause aborts for some combinations of configure settings. 707 - Fix strerror_r() usage to deal with non-standard semantics in GNU libc. 708 - Fix leak context reporting. This bug tended to cause the number of contexts 709 to be underreported (though the reported number of objects and bytes were 710 correct). 711 - Fix a realloc() bug for large in-place growing reallocation. This bug could 712 cause memory corruption, but it was hard to trigger. 713 - Fix an allocation bug for small allocations that could be triggered if 714 multiple threads raced to create a new run of backing pages. 715 - Enhance the heap profiler to trigger samples based on usable size, rather 716 than request size. 717 - Fix a heap profiling bug due to sometimes losing track of requested object 718 size for sampled objects. 719 720* 1.0.3 (August 12, 2010) 721 722 Bug fixes: 723 - Fix the libunwind-based implementation of stack backtracing (used for heap 724 profiling). This bug could cause zero-length backtraces to be reported. 725 - Add a missing mutex unlock in library initialization code. If multiple 726 threads raced to initialize malloc, some of them could end up permanently 727 blocked. 728 729* 1.0.2 (May 11, 2010) 730 731 Bug fixes: 732 - Fix junk filling of large objects, which could cause memory corruption. 733 - Add MAP_NORESERVE support for chunk mapping, because otherwise virtual 734 memory limits could cause swap file configuration to fail. Contributed by 735 Jordan DeLong. 736 737* 1.0.1 (April 14, 2010) 738 739 Bug fixes: 740 - Fix compilation when --enable-fill is specified. 741 - Fix threads-related profiling bugs that affected accuracy and caused memory 742 to be leaked during thread exit. 743 - Fix dirty page purging race conditions that could cause crashes. 744 - Fix crash in tcache flushing code during thread destruction. 745 746* 1.0.0 (April 11, 2010) 747 748 This release focuses on speed and run-time introspection. Numerous 749 algorithmic improvements make this release substantially faster than its 750 predecessors. 751 752 New features: 753 - Implement autoconf-based configuration system. 754 - Add mallctl*(), for the purposes of introspection and run-time 755 configuration. 756 - Make it possible for the application to manually flush a thread's cache, via 757 the "tcache.flush" mallctl. 758 - Base maximum dirty page count on proportion of active memory. 759 - Compute various additional run-time statistics, including per size class 760 statistics for large objects. 761 - Expose malloc_stats_print(), which can be called repeatedly by the 762 application. 763 - Simplify the malloc_message() signature to only take one string argument, 764 and incorporate an opaque data pointer argument for use by the application 765 in combination with malloc_stats_print(). 766 - Add support for allocation backed by one or more swap files, and allow the 767 application to disable over-commit if swap files are in use. 768 - Implement allocation profiling and leak checking. 769 770 Removed features: 771 - Remove the dynamic arena rebalancing code, since thread-specific caching 772 reduces its utility. 773 774 Bug fixes: 775 - Modify chunk allocation to work when address space layout randomization 776 (ASLR) is in use. 777 - Fix thread cleanup bugs related to TLS destruction. 778 - Handle 0-size allocation requests in posix_memalign(). 779 - Fix a chunk leak. The leaked chunks were never touched, so this impacted 780 virtual memory usage, but not physical memory usage. 781 782* linux_2008082[78]a (August 27/28, 2008) 783 784 These snapshot releases are the simple result of incorporating Linux-specific 785 support into the FreeBSD malloc sources. 786 787-------------------------------------------------------------------------------- 788vim:filetype=text:textwidth=80 789