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* 4.0.4 (October 24, 2015) 8 9 This bugfix release fixes another xallocx() regression. No other regressions 10 have come to light in over a month, so this is likely a good starting point 11 for people who prefer to wait for "dot one" releases with all the major issues 12 shaken out. 13 14 Bug fixes: 15 - Fix xallocx(..., MALLOCX_ZERO to zero the last full trailing page of large 16 allocations that have been randomly assigned an offset of 0 when 17 --enable-cache-oblivious configure option is enabled. 18 19* 4.0.3 (September 24, 2015) 20 21 This bugfix release continues the trend of xallocx() and heap profiling fixes. 22 23 Bug fixes: 24 - Fix xallocx(..., MALLOCX_ZERO) to zero all trailing bytes of large 25 allocations when --enable-cache-oblivious configure option is enabled. 26 - Fix xallocx(..., MALLOCX_ZERO) to zero trailing bytes of huge allocations 27 when resizing from/to a size class that is not a multiple of the chunk size. 28 - Fix prof_tctx_dump_iter() to filter out nodes that were created after heap 29 profile dumping started. 30 - Work around a potentially bad thread-specific data initialization 31 interaction with NPTL (glibc's pthreads implementation). 32 33* 4.0.2 (September 21, 2015) 34 35 This bugfix release addresses a few bugs specific to heap profiling. 36 37 Bug fixes: 38 - Fix ixallocx_prof_sample() to never modify nor create sampled small 39 allocations. xallocx() is in general incapable of moving small allocations, 40 so this fix removes buggy code without loss of generality. 41 - Fix irallocx_prof_sample() to always allocate large regions, even when 42 alignment is non-zero. 43 - Fix prof_alloc_rollback() to read tdata from thread-specific data rather 44 than dereferencing a potentially invalid tctx. 45 46* 4.0.1 (September 15, 2015) 47 48 This is a bugfix release that is somewhat high risk due to the amount of 49 refactoring required to address deep xallocx() problems. As a side effect of 50 these fixes, xallocx() now tries harder to partially fulfill requests for 51 optional extra space. Note that a couple of minor heap profiling 52 optimizations are included, but these are better thought of as performance 53 fixes that were integral to disovering most of the other bugs. 54 55 Optimizations: 56 - Avoid a chunk metadata read in arena_prof_tctx_set(), since it is in the 57 fast path when heap profiling is enabled. Additionally, split a special 58 case out into arena_prof_tctx_reset(), which also avoids chunk metadata 59 reads. 60 - Optimize irallocx_prof() to optimistically update the sampler state. The 61 prior implementation appears to have been a holdover from when 62 rallocx()/xallocx() functionality was combined as rallocm(). 63 64 Bug fixes: 65 - Fix TLS configuration such that it is enabled by default for platforms on 66 which it works correctly. 67 - Fix arenas_cache_cleanup() and arena_get_hard() to handle 68 allocation/deallocation within the application's thread-specific data 69 cleanup functions even after arenas_cache is torn down. 70 - Fix xallocx() bugs related to size+extra exceeding HUGE_MAXCLASS. 71 - Fix chunk purge hook calls for in-place huge shrinking reallocation to 72 specify the old chunk size rather than the new chunk size. This bug caused 73 no correctness issues for the default chunk purge function, but was 74 visible to custom functions set via the "arena.<i>.chunk_hooks" mallctl. 75 - Fix heap profiling bugs: 76 + Fix heap profiling to distinguish among otherwise identical sample sites 77 with interposed resets (triggered via the "prof.reset" mallctl). This bug 78 could cause data structure corruption that would most likely result in a 79 segfault. 80 + Fix irealloc_prof() to prof_alloc_rollback() on OOM. 81 + Make one call to prof_active_get_unlocked() per allocation event, and use 82 the result throughout the relevant functions that handle an allocation 83 event. Also add a missing check in prof_realloc(). These fixes protect 84 allocation events against concurrent prof_active changes. 85 + Fix ixallocx_prof() to pass usize_max and zero to ixallocx_prof_sample() 86 in the correct order. 87 + Fix prof_realloc() to call prof_free_sampled_object() after calling 88 prof_malloc_sample_object(). Prior to this fix, if tctx and old_tctx were 89 the same, the tctx could have been prematurely destroyed. 90 - Fix portability bugs: 91 + Don't bitshift by negative amounts when encoding/decoding run sizes in 92 chunk header maps. This affected systems with page sizes greater than 8 93 KiB. 94 + Rename index_t to szind_t to avoid an existing type on Solaris. 95 + Add JEMALLOC_CXX_THROW to the memalign() function prototype, in order to 96 match glibc and avoid compilation errors when including both 97 jemalloc/jemalloc.h and malloc.h in C++ code. 98 + Don't assume that /bin/sh is appropriate when running size_classes.sh 99 during configuration. 100 + Consider __sparcv9 a synonym for __sparc64__ when defining LG_QUANTUM. 101 + Link tests to librt if it contains clock_gettime(2). 102 103* 4.0.0 (August 17, 2015) 104 105 This version contains many speed and space optimizations, both minor and 106 major. The major themes are generalization, unification, and simplification. 107 Although many of these optimizations cause no visible behavior change, their 108 cumulative effect is substantial. 109 110 New features: 111 - Normalize size class spacing to be consistent across the complete size 112 range. By default there are four size classes per size doubling, but this 113 is now configurable via the --with-lg-size-class-group option. Also add the 114 --with-lg-page, --with-lg-page-sizes, --with-lg-quantum, and 115 --with-lg-tiny-min options, which can be used to tweak page and size class 116 settings. Impacts: 117 + Worst case performance for incrementally growing/shrinking reallocation 118 is improved because there are far fewer size classes, and therefore 119 copying happens less often. 120 + Internal fragmentation is limited to 20% for all but the smallest size 121 classes (those less than four times the quantum). (1B + 4 KiB) 122 and (1B + 4 MiB) previously suffered nearly 50% internal fragmentation. 123 + Chunk fragmentation tends to be lower because there are fewer distinct run 124 sizes to pack. 125 - Add support for explicit tcaches. The "tcache.create", "tcache.flush", and 126 "tcache.destroy" mallctls control tcache lifetime and flushing, and the 127 MALLOCX_TCACHE(tc) and MALLOCX_TCACHE_NONE flags to the *allocx() API 128 control which tcache is used for each operation. 129 - Implement per thread heap profiling, as well as the ability to 130 enable/disable heap profiling on a per thread basis. Add the "prof.reset", 131 "prof.lg_sample", "thread.prof.name", "thread.prof.active", 132 "opt.prof_thread_active_init", "prof.thread_active_init", and 133 "thread.prof.active" mallctls. 134 - Add support for per arena application-specified chunk allocators, configured 135 via the "arena.<i>.chunk_hooks" mallctl. 136 - Refactor huge allocation to be managed by arenas, so that arenas now 137 function as general purpose independent allocators. This is important in 138 the context of user-specified chunk allocators, aside from the scalability 139 benefits. Related new statistics: 140 + The "stats.arenas.<i>.huge.allocated", "stats.arenas.<i>.huge.nmalloc", 141 "stats.arenas.<i>.huge.ndalloc", and "stats.arenas.<i>.huge.nrequests" 142 mallctls provide high level per arena huge allocation statistics. 143 + The "arenas.nhchunks", "arenas.hchunk.<i>.size", 144 "stats.arenas.<i>.hchunks.<j>.nmalloc", 145 "stats.arenas.<i>.hchunks.<j>.ndalloc", 146 "stats.arenas.<i>.hchunks.<j>.nrequests", and 147 "stats.arenas.<i>.hchunks.<j>.curhchunks" mallctls provide per size class 148 statistics. 149 - Add the 'util' column to malloc_stats_print() output, which reports the 150 proportion of available regions that are currently in use for each small 151 size class. 152 - Add "alloc" and "free" modes for for junk filling (see the "opt.junk" 153 mallctl), so that it is possible to separately enable junk filling for 154 allocation versus deallocation. 155 - Add the jemalloc-config script, which provides information about how 156 jemalloc was configured, and how to integrate it into application builds. 157 - Add metadata statistics, which are accessible via the "stats.metadata", 158 "stats.arenas.<i>.metadata.mapped", and 159 "stats.arenas.<i>.metadata.allocated" mallctls. 160 - Add the "stats.resident" mallctl, which reports the upper limit of 161 physically resident memory mapped by the allocator. 162 - Add per arena control over unused dirty page purging, via the 163 "arenas.lg_dirty_mult", "arena.<i>.lg_dirty_mult", and 164 "stats.arenas.<i>.lg_dirty_mult" mallctls. 165 - Add the "prof.gdump" mallctl, which makes it possible to toggle the gdump 166 feature on/off during program execution. 167 - Add sdallocx(), which implements sized deallocation. The primary 168 optimization over dallocx() is the removal of a metadata read, which often 169 suffers an L1 cache miss. 170 - Add missing header includes in jemalloc/jemalloc.h, so that applications 171 only have to #include <jemalloc/jemalloc.h>. 172 - Add support for additional platforms: 173 + Bitrig 174 + Cygwin 175 + DragonFlyBSD 176 + iOS 177 + OpenBSD 178 + OpenRISC/or1k 179 180 Optimizations: 181 - Maintain dirty runs in per arena LRUs rather than in per arena trees of 182 dirty-run-containing chunks. In practice this change significantly reduces 183 dirty page purging volume. 184 - Integrate whole chunks into the unused dirty page purging machinery. This 185 reduces the cost of repeated huge allocation/deallocation, because it 186 effectively introduces a cache of chunks. 187 - Split the arena chunk map into two separate arrays, in order to increase 188 cache locality for the frequently accessed bits. 189 - Move small run metadata out of runs, into arena chunk headers. This reduces 190 run fragmentation, smaller runs reduce external fragmentation for small size 191 classes, and packed (less uniformly aligned) metadata layout improves CPU 192 cache set distribution. 193 - Randomly distribute large allocation base pointer alignment relative to page 194 boundaries in order to more uniformly utilize CPU cache sets. This can be 195 disabled via the --disable-cache-oblivious configure option, and queried via 196 the "config.cache_oblivious" mallctl. 197 - Micro-optimize the fast paths for the public API functions. 198 - Refactor thread-specific data to reside in a single structure. This assures 199 that only a single TLS read is necessary per call into the public API. 200 - Implement in-place huge allocation growing and shrinking. 201 - Refactor rtree (radix tree for chunk lookups) to be lock-free, and make 202 additional optimizations that reduce maximum lookup depth to one or two 203 levels. This resolves what was a concurrency bottleneck for per arena huge 204 allocation, because a global data structure is critical for determining 205 which arenas own which huge allocations. 206 207 Incompatible changes: 208 - Replace --enable-cc-silence with --disable-cc-silence to suppress spurious 209 warnings by default. 210 - Assure that the constness of malloc_usable_size()'s return type matches that 211 of the system implementation. 212 - Change the heap profile dump format to support per thread heap profiling, 213 rename pprof to jeprof, and enhance it with the --thread=<n> option. As a 214 result, the bundled jeprof must now be used rather than the upstream 215 (gperftools) pprof. 216 - Disable "opt.prof_final" by default, in order to avoid atexit(3), which can 217 internally deadlock on some platforms. 218 - Change the "arenas.nlruns" mallctl type from size_t to unsigned. 219 - Replace the "stats.arenas.<i>.bins.<j>.allocated" mallctl with 220 "stats.arenas.<i>.bins.<j>.curregs". 221 - Ignore MALLOC_CONF in set{uid,gid,cap} binaries. 222 - Ignore MALLOCX_ARENA(a) in dallocx(), in favor of using the 223 MALLOCX_TCACHE(tc) and MALLOCX_TCACHE_NONE flags to control tcache usage. 224 225 Removed features: 226 - Remove the *allocm() API, which is superseded by the *allocx() API. 227 - Remove the --enable-dss options, and make dss non-optional on all platforms 228 which support sbrk(2). 229 - Remove the "arenas.purge" mallctl, which was obsoleted by the 230 "arena.<i>.purge" mallctl in 3.1.0. 231 - Remove the unnecessary "opt.valgrind" mallctl; jemalloc automatically 232 detects whether it is running inside Valgrind. 233 - Remove the "stats.huge.allocated", "stats.huge.nmalloc", and 234 "stats.huge.ndalloc" mallctls. 235 - Remove the --enable-mremap option. 236 - Remove the "stats.chunks.current", "stats.chunks.total", and 237 "stats.chunks.high" mallctls. 238 239 Bug fixes: 240 - Fix the cactive statistic to decrease (rather than increase) when active 241 memory decreases. This regression was first released in 3.5.0. 242 - Fix OOM handling in memalign() and valloc(). A variant of this bug existed 243 in all releases since 2.0.0, which introduced these functions. 244 - Fix an OOM-related regression in arena_tcache_fill_small(), which could 245 cause cache corruption on OOM. This regression was present in all releases 246 from 2.2.0 through 3.6.0. 247 - Fix size class overflow handling for malloc(), posix_memalign(), memalign(), 248 calloc(), and realloc() when profiling is enabled. 249 - Fix the "arena.<i>.dss" mallctl to return an error if "primary" or 250 "secondary" precedence is specified, but sbrk(2) is not supported. 251 - Fix fallback lg_floor() implementations to handle extremely large inputs. 252 - Ensure the default purgeable zone is after the default zone on OS X. 253 - Fix latent bugs in atomic_*(). 254 - Fix the "arena.<i>.dss" mallctl to handle read-only calls. 255 - Fix tls_model configuration to enable the initial-exec model when possible. 256 - Mark malloc_conf as a weak symbol so that the application can override it. 257 - Correctly detect glibc's adaptive pthread mutexes. 258 - Fix the --without-export configure option. 259 260* 3.6.0 (March 31, 2014) 261 262 This version contains a critical bug fix for a regression present in 3.5.0 and 263 3.5.1. 264 265 Bug fixes: 266 - Fix a regression in arena_chunk_alloc() that caused crashes during 267 small/large allocation if chunk allocation failed. In the absence of this 268 bug, chunk allocation failure would result in allocation failure, e.g. NULL 269 return from malloc(). This regression was introduced in 3.5.0. 270 - Fix backtracing for gcc intrinsics-based backtracing by specifying 271 -fno-omit-frame-pointer to gcc. Note that the application (and all the 272 libraries it links to) must also be compiled with this option for 273 backtracing to be reliable. 274 - Use dss allocation precedence for huge allocations as well as small/large 275 allocations. 276 - Fix test assertion failure message formatting. This bug did not manifest on 277 x86_64 systems because of implementation subtleties in va_list. 278 - Fix inconsequential test failures for hash and SFMT code. 279 280 New features: 281 - Support heap profiling on FreeBSD. This feature depends on the proc 282 filesystem being mounted during heap profile dumping. 283 284* 3.5.1 (February 25, 2014) 285 286 This version primarily addresses minor bugs in test code. 287 288 Bug fixes: 289 - Configure Solaris/Illumos to use MADV_FREE. 290 - Fix junk filling for mremap(2)-based huge reallocation. This is only 291 relevant if configuring with the --enable-mremap option specified. 292 - Avoid compilation failure if 'restrict' C99 keyword is not supported by the 293 compiler. 294 - Add a configure test for SSE2 rather than assuming it is usable on i686 295 systems. This fixes test compilation errors, especially on 32-bit Linux 296 systems. 297 - Fix mallctl argument size mismatches (size_t vs. uint64_t) in the stats unit 298 test. 299 - Fix/remove flawed alignment-related overflow tests. 300 - Prevent compiler optimizations that could change backtraces in the 301 prof_accum unit test. 302 303* 3.5.0 (January 22, 2014) 304 305 This version focuses on refactoring and automated testing, though it also 306 includes some non-trivial heap profiling optimizations not mentioned below. 307 308 New features: 309 - Add the *allocx() API, which is a successor to the experimental *allocm() 310 API. The *allocx() functions are slightly simpler to use because they have 311 fewer parameters, they directly return the results of primary interest, and 312 mallocx()/rallocx() avoid the strict aliasing pitfall that 313 allocm()/rallocm() share with posix_memalign(). Note that *allocm() is 314 slated for removal in the next non-bugfix release. 315 - Add support for LinuxThreads. 316 317 Bug fixes: 318 - Unless heap profiling is enabled, disable floating point code and don't link 319 with libm. This, in combination with e.g. EXTRA_CFLAGS=-mno-sse on x64 320 systems, makes it possible to completely disable floating point register 321 use. Some versions of glibc neglect to save/restore caller-saved floating 322 point registers during dynamic lazy symbol loading, and the symbol loading 323 code uses whatever malloc the application happens to have linked/loaded 324 with, the result being potential floating point register corruption. 325 - Report ENOMEM rather than EINVAL if an OOM occurs during heap profiling 326 backtrace creation in imemalign(). This bug impacted posix_memalign() and 327 aligned_alloc(). 328 - Fix a file descriptor leak in a prof_dump_maps() error path. 329 - Fix prof_dump() to close the dump file descriptor for all relevant error 330 paths. 331 - Fix rallocm() to use the arena specified by the ALLOCM_ARENA(s) flag for 332 allocation, not just deallocation. 333 - Fix a data race for large allocation stats counters. 334 - Fix a potential infinite loop during thread exit. This bug occurred on 335 Solaris, and could affect other platforms with similar pthreads TSD 336 implementations. 337 - Don't junk-fill reallocations unless usable size changes. This fixes a 338 violation of the *allocx()/*allocm() semantics. 339 - Fix growing large reallocation to junk fill new space. 340 - Fix huge deallocation to junk fill when munmap is disabled. 341 - Change the default private namespace prefix from empty to je_, and change 342 --with-private-namespace-prefix so that it prepends an additional prefix 343 rather than replacing je_. This reduces the likelihood of applications 344 which statically link jemalloc experiencing symbol name collisions. 345 - Add missing private namespace mangling (relevant when 346 --with-private-namespace is specified). 347 - Add and use JEMALLOC_INLINE_C so that static inline functions are marked as 348 static even for debug builds. 349 - Add a missing mutex unlock in a malloc_init_hard() error path. In practice 350 this error path is never executed. 351 - Fix numerous bugs in malloc_strotumax() error handling/reporting. These 352 bugs had no impact except for malformed inputs. 353 - Fix numerous bugs in malloc_snprintf(). These bugs were not exercised by 354 existing calls, so they had no impact. 355 356* 3.4.1 (October 20, 2013) 357 358 Bug fixes: 359 - Fix a race in the "arenas.extend" mallctl that could cause memory corruption 360 of internal data structures and subsequent crashes. 361 - Fix Valgrind integration flaws that caused Valgrind warnings about reads of 362 uninitialized memory in: 363 + arena chunk headers 364 + internal zero-initialized data structures (relevant to tcache and prof 365 code) 366 - Preserve errno during the first allocation. A readlink(2) call during 367 initialization fails unless /etc/malloc.conf exists, so errno was typically 368 set during the first allocation prior to this fix. 369 - Fix compilation warnings reported by gcc 4.8.1. 370 371* 3.4.0 (June 2, 2013) 372 373 This version is essentially a small bugfix release, but the addition of 374 aarch64 support requires that the minor version be incremented. 375 376 Bug fixes: 377 - Fix race-triggered deadlocks in chunk_record(). These deadlocks were 378 typically triggered by multiple threads concurrently deallocating huge 379 objects. 380 381 New features: 382 - Add support for the aarch64 architecture. 383 384* 3.3.1 (March 6, 2013) 385 386 This version fixes bugs that are typically encountered only when utilizing 387 custom run-time options. 388 389 Bug fixes: 390 - Fix a locking order bug that could cause deadlock during fork if heap 391 profiling were enabled. 392 - Fix a chunk recycling bug that could cause the allocator to lose track of 393 whether a chunk was zeroed. On FreeBSD, NetBSD, and OS X, it could cause 394 corruption if allocating via sbrk(2) (unlikely unless running with the 395 "dss:primary" option specified). This was completely harmless on Linux 396 unless using mlockall(2) (and unlikely even then, unless the 397 --disable-munmap configure option or the "dss:primary" option was 398 specified). This regression was introduced in 3.1.0 by the 399 mlockall(2)/madvise(2) interaction fix. 400 - Fix TLS-related memory corruption that could occur during thread exit if the 401 thread never allocated memory. Only the quarantine and prof facilities were 402 susceptible. 403 - Fix two quarantine bugs: 404 + Internal reallocation of the quarantined object array leaked the old 405 array. 406 + Reallocation failure for internal reallocation of the quarantined object 407 array (very unlikely) resulted in memory corruption. 408 - Fix Valgrind integration to annotate all internally allocated memory in a 409 way that keeps Valgrind happy about internal data structure access. 410 - Fix building for s390 systems. 411 412* 3.3.0 (January 23, 2013) 413 414 This version includes a few minor performance improvements in addition to the 415 listed new features and bug fixes. 416 417 New features: 418 - Add clipping support to lg_chunk option processing. 419 - Add the --enable-ivsalloc option. 420 - Add the --without-export option. 421 - Add the --disable-zone-allocator option. 422 423 Bug fixes: 424 - Fix "arenas.extend" mallctl to output the number of arenas. 425 - Fix chunk_recycle() to unconditionally inform Valgrind that returned memory 426 is undefined. 427 - Fix build break on FreeBSD related to alloca.h. 428 429* 3.2.0 (November 9, 2012) 430 431 In addition to a couple of bug fixes, this version modifies page run 432 allocation and dirty page purging algorithms in order to better control 433 page-level virtual memory fragmentation. 434 435 Incompatible changes: 436 - Change the "opt.lg_dirty_mult" default from 5 to 3 (32:1 to 8:1). 437 438 Bug fixes: 439 - Fix dss/mmap allocation precedence code to use recyclable mmap memory only 440 after primary dss allocation fails. 441 - Fix deadlock in the "arenas.purge" mallctl. This regression was introduced 442 in 3.1.0 by the addition of the "arena.<i>.purge" mallctl. 443 444* 3.1.0 (October 16, 2012) 445 446 New features: 447 - Auto-detect whether running inside Valgrind, thus removing the need to 448 manually specify MALLOC_CONF=valgrind:true. 449 - Add the "arenas.extend" mallctl, which allows applications to create 450 manually managed arenas. 451 - Add the ALLOCM_ARENA() flag for {,r,d}allocm(). 452 - Add the "opt.dss", "arena.<i>.dss", and "stats.arenas.<i>.dss" mallctls, 453 which provide control over dss/mmap precedence. 454 - Add the "arena.<i>.purge" mallctl, which obsoletes "arenas.purge". 455 - Define LG_QUANTUM for hppa. 456 457 Incompatible changes: 458 - Disable tcache by default if running inside Valgrind, in order to avoid 459 making unallocated objects appear reachable to Valgrind. 460 - Drop const from malloc_usable_size() argument on Linux. 461 462 Bug fixes: 463 - Fix heap profiling crash if sampled object is freed via realloc(p, 0). 464 - Remove const from __*_hook variable declarations, so that glibc can modify 465 them during process forking. 466 - Fix mlockall(2)/madvise(2) interaction. 467 - Fix fork(2)-related deadlocks. 468 - Fix error return value for "thread.tcache.enabled" mallctl. 469 470* 3.0.0 (May 11, 2012) 471 472 Although this version adds some major new features, the primary focus is on 473 internal code cleanup that facilitates maintainability and portability, most 474 of which is not reflected in the ChangeLog. This is the first release to 475 incorporate substantial contributions from numerous other developers, and the 476 result is a more broadly useful allocator (see the git revision history for 477 contribution details). Note that the license has been unified, thanks to 478 Facebook granting a license under the same terms as the other copyright 479 holders (see COPYING). 480 481 New features: 482 - Implement Valgrind support, redzones, and quarantine. 483 - Add support for additional platforms: 484 + FreeBSD 485 + Mac OS X Lion 486 + MinGW 487 + Windows (no support yet for replacing the system malloc) 488 - Add support for additional architectures: 489 + MIPS 490 + SH4 491 + Tilera 492 - Add support for cross compiling. 493 - Add nallocm(), which rounds a request size up to the nearest size class 494 without actually allocating. 495 - Implement aligned_alloc() (blame C11). 496 - Add the "thread.tcache.enabled" mallctl. 497 - Add the "opt.prof_final" mallctl. 498 - Update pprof (from gperftools 2.0). 499 - Add the --with-mangling option. 500 - Add the --disable-experimental option. 501 - Add the --disable-munmap option, and make it the default on Linux. 502 - Add the --enable-mremap option, which disables use of mremap(2) by default. 503 504 Incompatible changes: 505 - Enable stats by default. 506 - Enable fill by default. 507 - Disable lazy locking by default. 508 - Rename the "tcache.flush" mallctl to "thread.tcache.flush". 509 - Rename the "arenas.pagesize" mallctl to "arenas.page". 510 - Change the "opt.lg_prof_sample" default from 0 to 19 (1 B to 512 KiB). 511 - Change the "opt.prof_accum" default from true to false. 512 513 Removed features: 514 - Remove the swap feature, including the "config.swap", "swap.avail", 515 "swap.prezeroed", "swap.nfds", and "swap.fds" mallctls. 516 - Remove highruns statistics, including the 517 "stats.arenas.<i>.bins.<j>.highruns" and 518 "stats.arenas.<i>.lruns.<j>.highruns" mallctls. 519 - As part of small size class refactoring, remove the "opt.lg_[qc]space_max", 520 "arenas.cacheline", "arenas.subpage", "arenas.[tqcs]space_{min,max}", and 521 "arenas.[tqcs]bins" mallctls. 522 - Remove the "arenas.chunksize" mallctl. 523 - Remove the "opt.lg_prof_tcmax" option. 524 - Remove the "opt.lg_prof_bt_max" option. 525 - Remove the "opt.lg_tcache_gc_sweep" option. 526 - Remove the --disable-tiny option, including the "config.tiny" mallctl. 527 - Remove the --enable-dynamic-page-shift configure option. 528 - Remove the --enable-sysv configure option. 529 530 Bug fixes: 531 - Fix a statistics-related bug in the "thread.arena" mallctl that could cause 532 invalid statistics and crashes. 533 - Work around TLS deallocation via free() on Linux. This bug could cause 534 write-after-free memory corruption. 535 - Fix a potential deadlock that could occur during interval- and 536 growth-triggered heap profile dumps. 537 - Fix large calloc() zeroing bugs due to dropping chunk map unzeroed flags. 538 - Fix chunk_alloc_dss() to stop claiming memory is zeroed. This bug could 539 cause memory corruption and crashes with --enable-dss specified. 540 - Fix fork-related bugs that could cause deadlock in children between fork 541 and exec. 542 - Fix malloc_stats_print() to honor 'b' and 'l' in the opts parameter. 543 - Fix realloc(p, 0) to act like free(p). 544 - Do not enforce minimum alignment in memalign(). 545 - Check for NULL pointer in malloc_usable_size(). 546 - Fix an off-by-one heap profile statistics bug that could be observed in 547 interval- and growth-triggered heap profiles. 548 - Fix the "epoch" mallctl to update cached stats even if the passed in epoch 549 is 0. 550 - Fix bin->runcur management to fix a layout policy bug. This bug did not 551 affect correctness. 552 - Fix a bug in choose_arena_hard() that potentially caused more arenas to be 553 initialized than necessary. 554 - Add missing "opt.lg_tcache_max" mallctl implementation. 555 - Use glibc allocator hooks to make mixed allocator usage less likely. 556 - Fix build issues for --disable-tcache. 557 - Don't mangle pthread_create() when --with-private-namespace is specified. 558 559* 2.2.5 (November 14, 2011) 560 561 Bug fixes: 562 - Fix huge_ralloc() race when using mremap(2). This is a serious bug that 563 could cause memory corruption and/or crashes. 564 - Fix huge_ralloc() to maintain chunk statistics. 565 - Fix malloc_stats_print(..., "a") output. 566 567* 2.2.4 (November 5, 2011) 568 569 Bug fixes: 570 - Initialize arenas_tsd before using it. This bug existed for 2.2.[0-3], as 571 well as for --disable-tls builds in earlier releases. 572 - Do not assume a 4 KiB page size in test/rallocm.c. 573 574* 2.2.3 (August 31, 2011) 575 576 This version fixes numerous bugs related to heap profiling. 577 578 Bug fixes: 579 - Fix a prof-related race condition. This bug could cause memory corruption, 580 but only occurred in non-default configurations (prof_accum:false). 581 - Fix off-by-one backtracing issues (make sure that prof_alloc_prep() is 582 excluded from backtraces). 583 - Fix a prof-related bug in realloc() (only triggered by OOM errors). 584 - Fix prof-related bugs in allocm() and rallocm(). 585 - Fix prof_tdata_cleanup() for --disable-tls builds. 586 - Fix a relative include path, to fix objdir builds. 587 588* 2.2.2 (July 30, 2011) 589 590 Bug fixes: 591 - Fix a build error for --disable-tcache. 592 - Fix assertions in arena_purge() (for real this time). 593 - Add the --with-private-namespace option. This is a workaround for symbol 594 conflicts that can inadvertently arise when using static libraries. 595 596* 2.2.1 (March 30, 2011) 597 598 Bug fixes: 599 - Implement atomic operations for x86/x64. This fixes compilation failures 600 for versions of gcc that are still in wide use. 601 - Fix an assertion in arena_purge(). 602 603* 2.2.0 (March 22, 2011) 604 605 This version incorporates several improvements to algorithms and data 606 structures that tend to reduce fragmentation and increase speed. 607 608 New features: 609 - Add the "stats.cactive" mallctl. 610 - Update pprof (from google-perftools 1.7). 611 - Improve backtracing-related configuration logic, and add the 612 --disable-prof-libgcc option. 613 614 Bug fixes: 615 - Change default symbol visibility from "internal", to "hidden", which 616 decreases the overhead of library-internal function calls. 617 - Fix symbol visibility so that it is also set on OS X. 618 - Fix a build dependency regression caused by the introduction of the .pic.o 619 suffix for PIC object files. 620 - Add missing checks for mutex initialization failures. 621 - Don't use libgcc-based backtracing except on x64, where it is known to work. 622 - Fix deadlocks on OS X that were due to memory allocation in 623 pthread_mutex_lock(). 624 - Heap profiling-specific fixes: 625 + Fix memory corruption due to integer overflow in small region index 626 computation, when using a small enough sample interval that profiling 627 context pointers are stored in small run headers. 628 + Fix a bootstrap ordering bug that only occurred with TLS disabled. 629 + Fix a rallocm() rsize bug. 630 + Fix error detection bugs for aligned memory allocation. 631 632* 2.1.3 (March 14, 2011) 633 634 Bug fixes: 635 - Fix a cpp logic regression (due to the "thread.{de,}allocatedp" mallctl fix 636 for OS X in 2.1.2). 637 - Fix a "thread.arena" mallctl bug. 638 - Fix a thread cache stats merging bug. 639 640* 2.1.2 (March 2, 2011) 641 642 Bug fixes: 643 - Fix "thread.{de,}allocatedp" mallctl for OS X. 644 - Add missing jemalloc.a to build system. 645 646* 2.1.1 (January 31, 2011) 647 648 Bug fixes: 649 - Fix aligned huge reallocation (affected allocm()). 650 - Fix the ALLOCM_LG_ALIGN macro definition. 651 - Fix a heap dumping deadlock. 652 - Fix a "thread.arena" mallctl bug. 653 654* 2.1.0 (December 3, 2010) 655 656 This version incorporates some optimizations that can't quite be considered 657 bug fixes. 658 659 New features: 660 - Use Linux's mremap(2) for huge object reallocation when possible. 661 - Avoid locking in mallctl*() when possible. 662 - Add the "thread.[de]allocatedp" mallctl's. 663 - Convert the manual page source from roff to DocBook, and generate both roff 664 and HTML manuals. 665 666 Bug fixes: 667 - Fix a crash due to incorrect bootstrap ordering. This only impacted 668 --enable-debug --enable-dss configurations. 669 - Fix a minor statistics bug for mallctl("swap.avail", ...). 670 671* 2.0.1 (October 29, 2010) 672 673 Bug fixes: 674 - Fix a race condition in heap profiling that could cause undefined behavior 675 if "opt.prof_accum" were disabled. 676 - Add missing mutex unlocks for some OOM error paths in the heap profiling 677 code. 678 - Fix a compilation error for non-C99 builds. 679 680* 2.0.0 (October 24, 2010) 681 682 This version focuses on the experimental *allocm() API, and on improved 683 run-time configuration/introspection. Nonetheless, numerous performance 684 improvements are also included. 685 686 New features: 687 - Implement the experimental {,r,s,d}allocm() API, which provides a superset 688 of the functionality available via malloc(), calloc(), posix_memalign(), 689 realloc(), malloc_usable_size(), and free(). These functions can be used to 690 allocate/reallocate aligned zeroed memory, ask for optional extra memory 691 during reallocation, prevent object movement during reallocation, etc. 692 - Replace JEMALLOC_OPTIONS/JEMALLOC_PROF_PREFIX with MALLOC_CONF, which is 693 more human-readable, and more flexible. For example: 694 JEMALLOC_OPTIONS=AJP 695 is now: 696 MALLOC_CONF=abort:true,fill:true,stats_print:true 697 - Port to Apple OS X. Sponsored by Mozilla. 698 - Make it possible for the application to control thread-->arena mappings via 699 the "thread.arena" mallctl. 700 - Add compile-time support for all TLS-related functionality via pthreads TSD. 701 This is mainly of interest for OS X, which does not support TLS, but has a 702 TSD implementation with similar performance. 703 - Override memalign() and valloc() if they are provided by the system. 704 - Add the "arenas.purge" mallctl, which can be used to synchronously purge all 705 dirty unused pages. 706 - Make cumulative heap profiling data optional, so that it is possible to 707 limit the amount of memory consumed by heap profiling data structures. 708 - Add per thread allocation counters that can be accessed via the 709 "thread.allocated" and "thread.deallocated" mallctls. 710 711 Incompatible changes: 712 - Remove JEMALLOC_OPTIONS and malloc_options (see MALLOC_CONF above). 713 - Increase default backtrace depth from 4 to 128 for heap profiling. 714 - Disable interval-based profile dumps by default. 715 716 Bug fixes: 717 - Remove bad assertions in fork handler functions. These assertions could 718 cause aborts for some combinations of configure settings. 719 - Fix strerror_r() usage to deal with non-standard semantics in GNU libc. 720 - Fix leak context reporting. This bug tended to cause the number of contexts 721 to be underreported (though the reported number of objects and bytes were 722 correct). 723 - Fix a realloc() bug for large in-place growing reallocation. This bug could 724 cause memory corruption, but it was hard to trigger. 725 - Fix an allocation bug for small allocations that could be triggered if 726 multiple threads raced to create a new run of backing pages. 727 - Enhance the heap profiler to trigger samples based on usable size, rather 728 than request size. 729 - Fix a heap profiling bug due to sometimes losing track of requested object 730 size for sampled objects. 731 732* 1.0.3 (August 12, 2010) 733 734 Bug fixes: 735 - Fix the libunwind-based implementation of stack backtracing (used for heap 736 profiling). This bug could cause zero-length backtraces to be reported. 737 - Add a missing mutex unlock in library initialization code. If multiple 738 threads raced to initialize malloc, some of them could end up permanently 739 blocked. 740 741* 1.0.2 (May 11, 2010) 742 743 Bug fixes: 744 - Fix junk filling of large objects, which could cause memory corruption. 745 - Add MAP_NORESERVE support for chunk mapping, because otherwise virtual 746 memory limits could cause swap file configuration to fail. Contributed by 747 Jordan DeLong. 748 749* 1.0.1 (April 14, 2010) 750 751 Bug fixes: 752 - Fix compilation when --enable-fill is specified. 753 - Fix threads-related profiling bugs that affected accuracy and caused memory 754 to be leaked during thread exit. 755 - Fix dirty page purging race conditions that could cause crashes. 756 - Fix crash in tcache flushing code during thread destruction. 757 758* 1.0.0 (April 11, 2010) 759 760 This release focuses on speed and run-time introspection. Numerous 761 algorithmic improvements make this release substantially faster than its 762 predecessors. 763 764 New features: 765 - Implement autoconf-based configuration system. 766 - Add mallctl*(), for the purposes of introspection and run-time 767 configuration. 768 - Make it possible for the application to manually flush a thread's cache, via 769 the "tcache.flush" mallctl. 770 - Base maximum dirty page count on proportion of active memory. 771 - Compute various additional run-time statistics, including per size class 772 statistics for large objects. 773 - Expose malloc_stats_print(), which can be called repeatedly by the 774 application. 775 - Simplify the malloc_message() signature to only take one string argument, 776 and incorporate an opaque data pointer argument for use by the application 777 in combination with malloc_stats_print(). 778 - Add support for allocation backed by one or more swap files, and allow the 779 application to disable over-commit if swap files are in use. 780 - Implement allocation profiling and leak checking. 781 782 Removed features: 783 - Remove the dynamic arena rebalancing code, since thread-specific caching 784 reduces its utility. 785 786 Bug fixes: 787 - Modify chunk allocation to work when address space layout randomization 788 (ASLR) is in use. 789 - Fix thread cleanup bugs related to TLS destruction. 790 - Handle 0-size allocation requests in posix_memalign(). 791 - Fix a chunk leak. The leaked chunks were never touched, so this impacted 792 virtual memory usage, but not physical memory usage. 793 794* linux_2008082[78]a (August 27/28, 2008) 795 796 These snapshot releases are the simple result of incorporating Linux-specific 797 support into the FreeBSD malloc sources. 798 799-------------------------------------------------------------------------------- 800vim:filetype=text:textwidth=80 801