blob: b7381a5838a537ca954bd9b6046062b9eda42aa6 [file] [log] [blame]
Jason Evans379f8472010-10-24 16:18:29 -07001Following are change highlights associated with official releases. Important
Jason Evansbe09b812015-07-07 09:33:22 -07002bug fixes are all mentioned, but some internal enhancements are omitted here for
3brevity. Much more detail can be found in the git revision history:
Jason Evans379f8472010-10-24 16:18:29 -07004
Jason Evansb9ec5c92014-02-25 16:43:51 -08005 https://github.com/jemalloc/jemalloc
6
Jason Evansfb64ec22015-09-21 18:37:18 -07007* 4.0.3 (XXX)
8
9 Bug fixes:
Jason Evansd260f442015-09-24 16:38:45 -070010 - Fix xallocx(..., MALLOCX_ZERO) to zero all trailing bytes of large
11 allocations when --enable-cache-oblivious configure option is enabled.
12 - Fix xallocx(..., MALLOCX_ZERO) to zero trailing bytes of huge allocations
13 when resizing from/to a size class that is not a multiple of the chunk size.
Jason Evansfb64ec22015-09-21 18:37:18 -070014 - Fix prof_tctx_dump_iter() to filter out nodes that were created after heap
15 profile dumping started.
Jason Evansd36c7eb2015-09-24 16:53:18 -070016 - Work around a potentially bad thread-specific data initialization
17 interaction with NPTL (glibc's pthreads implementation).
Jason Evansfb64ec22015-09-21 18:37:18 -070018
Jason Evansb8e966f2015-09-21 10:19:37 -070019* 4.0.2 (September 21, 2015)
20
21 This bugfix release addresses a few bugs specific to heap profiling.
Jason Evans38e2c8f2015-09-17 10:05:56 -070022
23 Bug fixes:
24 - Fix ixallocx_prof_sample() to never modify nor create sampled small
25 allocations. xallocx() is in general incapable of moving small allocations,
26 so this fix removes buggy code without loss of generality.
Jason Evans4be9c792015-09-17 10:17:55 -070027 - Fix irallocx_prof_sample() to always allocate large regions, even when
28 alignment is non-zero.
Jason Evans3ca0cf62015-09-17 14:47:39 -070029 - Fix prof_alloc_rollback() to read tdata from thread-specific data rather
30 than dereferencing a potentially invalid tctx.
Jason Evans38e2c8f2015-09-17 10:05:56 -070031
Jason Evans1d7540c2015-09-15 15:26:23 -070032* 4.0.1 (September 15, 2015)
33
34 This is a bugfix release that is somewhat high risk due to the amount of
35 refactoring required to address deep xallocx() problems. As a side effect of
36 these fixes, xallocx() now tries harder to partially fulfill requests for
37 optional extra space. Note that a couple of minor heap profiling
38 optimizations are included, but these are better thought of as performance
39 fixes that were integral to disovering most of the other bugs.
40
41 Optimizations:
42 - Avoid a chunk metadata read in arena_prof_tctx_set(), since it is in the
43 fast path when heap profiling is enabled. Additionally, split a special
44 case out into arena_prof_tctx_reset(), which also avoids chunk metadata
45 reads.
46 - Optimize irallocx_prof() to optimistically update the sampler state. The
47 prior implementation appears to have been a holdover from when
48 rallocx()/xallocx() functionality was combined as rallocm().
Jason Evans5ef33a92015-08-19 14:12:05 -070049
50 Bug fixes:
Jason Evans1d7540c2015-09-15 15:26:23 -070051 - Fix TLS configuration such that it is enabled by default for platforms on
52 which it works correctly.
Jason Evans30949da2015-08-25 16:13:59 -070053 - Fix arenas_cache_cleanup() and arena_get_hard() to handle
54 allocation/deallocation within the application's thread-specific data
55 cleanup functions even after arenas_cache is torn down.
Jason Evans1d7540c2015-09-15 15:26:23 -070056 - Fix xallocx() bugs related to size+extra exceeding HUGE_MAXCLASS.
Mike Hommey6d8075f2015-08-27 20:30:15 -070057 - Fix chunk purge hook calls for in-place huge shrinking reallocation to
58 specify the old chunk size rather than the new chunk size. This bug caused
59 no correctness issues for the default chunk purge function, but was
60 visible to custom functions set via the "arena.<i>.chunk_hooks" mallctl.
Jason Evans1d7540c2015-09-15 15:26:23 -070061 - Fix heap profiling bugs:
62 + Fix heap profiling to distinguish among otherwise identical sample sites
63 with interposed resets (triggered via the "prof.reset" mallctl). This bug
64 could cause data structure corruption that would most likely result in a
65 segfault.
66 + Fix irealloc_prof() to prof_alloc_rollback() on OOM.
67 + Make one call to prof_active_get_unlocked() per allocation event, and use
68 the result throughout the relevant functions that handle an allocation
69 event. Also add a missing check in prof_realloc(). These fixes protect
70 allocation events against concurrent prof_active changes.
71 + Fix ixallocx_prof() to pass usize_max and zero to ixallocx_prof_sample()
72 in the correct order.
73 + Fix prof_realloc() to call prof_free_sampled_object() after calling
74 prof_malloc_sample_object(). Prior to this fix, if tctx and old_tctx were
75 the same, the tctx could have been prematurely destroyed.
76 - Fix portability bugs:
77 + Don't bitshift by negative amounts when encoding/decoding run sizes in
78 chunk header maps. This affected systems with page sizes greater than 8
79 KiB.
80 + Rename index_t to szind_t to avoid an existing type on Solaris.
81 + Add JEMALLOC_CXX_THROW to the memalign() function prototype, in order to
82 match glibc and avoid compilation errors when including both
83 jemalloc/jemalloc.h and malloc.h in C++ code.
84 + Don't assume that /bin/sh is appropriate when running size_classes.sh
85 during configuration.
86 + Consider __sparcv9 a synonym for __sparc64__ when defining LG_QUANTUM.
87 + Link tests to librt if it contains clock_gettime(2).
Jason Evans5ef33a92015-08-19 14:12:05 -070088
Jason Evans9b68f672015-08-17 13:21:08 -070089* 4.0.0 (August 17, 2015)
Jason Evans54673fd2015-02-23 22:28:43 -080090
91 This version contains many speed and space optimizations, both minor and
92 major. The major themes are generalization, unification, and simplification.
93 Although many of these optimizations cause no visible behavior change, their
94 cumulative effect is substantial.
95
96 New features:
97 - Normalize size class spacing to be consistent across the complete size
98 range. By default there are four size classes per size doubling, but this
99 is now configurable via the --with-lg-size-class-group option. Also add the
100 --with-lg-page, --with-lg-page-sizes, --with-lg-quantum, and
101 --with-lg-tiny-min options, which can be used to tweak page and size class
102 settings. Impacts:
103 + Worst case performance for incrementally growing/shrinking reallocation
104 is improved because there are far fewer size classes, and therefore
105 copying happens less often.
106 + Internal fragmentation is limited to 20% for all but the smallest size
107 classes (those less than four times the quantum). (1B + 4 KiB)
108 and (1B + 4 MiB) previously suffered nearly 50% internal fragmentation.
109 + Chunk fragmentation tends to be lower because there are fewer distinct run
110 sizes to pack.
111 - Add support for explicit tcaches. The "tcache.create", "tcache.flush", and
112 "tcache.destroy" mallctls control tcache lifetime and flushing, and the
113 MALLOCX_TCACHE(tc) and MALLOCX_TCACHE_NONE flags to the *allocx() API
114 control which tcache is used for each operation.
115 - Implement per thread heap profiling, as well as the ability to
116 enable/disable heap profiling on a per thread basis. Add the "prof.reset",
117 "prof.lg_sample", "thread.prof.name", "thread.prof.active",
118 "opt.prof_thread_active_init", "prof.thread_active_init", and
119 "thread.prof.active" mallctls.
120 - Add support for per arena application-specified chunk allocators, configured
Jason Evansb49a3342015-07-28 11:28:19 -0400121 via the "arena.<i>.chunk_hooks" mallctl.
Jason Evans54673fd2015-02-23 22:28:43 -0800122 - Refactor huge allocation to be managed by arenas, so that arenas now
123 function as general purpose independent allocators. This is important in
124 the context of user-specified chunk allocators, aside from the scalability
125 benefits. Related new statistics:
126 + The "stats.arenas.<i>.huge.allocated", "stats.arenas.<i>.huge.nmalloc",
127 "stats.arenas.<i>.huge.ndalloc", and "stats.arenas.<i>.huge.nrequests"
128 mallctls provide high level per arena huge allocation statistics.
Qinfan Wu89750352015-04-21 16:57:42 -0700129 + The "arenas.nhchunks", "arenas.hchunk.<i>.size",
Jason Evans54673fd2015-02-23 22:28:43 -0800130 "stats.arenas.<i>.hchunks.<j>.nmalloc",
131 "stats.arenas.<i>.hchunks.<j>.ndalloc",
132 "stats.arenas.<i>.hchunks.<j>.nrequests", and
133 "stats.arenas.<i>.hchunks.<j>.curhchunks" mallctls provide per size class
134 statistics.
135 - Add the 'util' column to malloc_stats_print() output, which reports the
136 proportion of available regions that are currently in use for each small
137 size class.
138 - Add "alloc" and "free" modes for for junk filling (see the "opt.junk"
139 mallctl), so that it is possible to separately enable junk filling for
140 allocation versus deallocation.
141 - Add the jemalloc-config script, which provides information about how
142 jemalloc was configured, and how to integrate it into application builds.
143 - Add metadata statistics, which are accessible via the "stats.metadata",
144 "stats.arenas.<i>.metadata.mapped", and
145 "stats.arenas.<i>.metadata.allocated" mallctls.
Jason Evans4acd75a2015-03-23 17:25:57 -0700146 - Add the "stats.resident" mallctl, which reports the upper limit of
147 physically resident memory mapped by the allocator.
Jason Evans562d2662015-03-24 16:36:12 -0700148 - Add per arena control over unused dirty page purging, via the
149 "arenas.lg_dirty_mult", "arena.<i>.lg_dirty_mult", and
150 "stats.arenas.<i>.lg_dirty_mult" mallctls.
Jason Evans54673fd2015-02-23 22:28:43 -0800151 - Add the "prof.gdump" mallctl, which makes it possible to toggle the gdump
152 feature on/off during program execution.
153 - Add sdallocx(), which implements sized deallocation. The primary
154 optimization over dallocx() is the removal of a metadata read, which often
155 suffers an L1 cache miss.
156 - Add missing header includes in jemalloc/jemalloc.h, so that applications
157 only have to #include <jemalloc/jemalloc.h>.
158 - Add support for additional platforms:
159 + Bitrig
160 + Cygwin
161 + DragonFlyBSD
162 + iOS
163 + OpenBSD
164 + OpenRISC/or1k
165
166 Optimizations:
Jason Evans54673fd2015-02-23 22:28:43 -0800167 - Maintain dirty runs in per arena LRUs rather than in per arena trees of
168 dirty-run-containing chunks. In practice this change significantly reduces
169 dirty page purging volume.
170 - Integrate whole chunks into the unused dirty page purging machinery. This
171 reduces the cost of repeated huge allocation/deallocation, because it
172 effectively introduces a cache of chunks.
173 - Split the arena chunk map into two separate arrays, in order to increase
174 cache locality for the frequently accessed bits.
175 - Move small run metadata out of runs, into arena chunk headers. This reduces
176 run fragmentation, smaller runs reduce external fragmentation for small size
177 classes, and packed (less uniformly aligned) metadata layout improves CPU
178 cache set distribution.
Jason Evans8a03cf02015-05-04 09:58:36 -0700179 - Randomly distribute large allocation base pointer alignment relative to page
180 boundaries in order to more uniformly utilize CPU cache sets. This can be
Jason Evansf2bc8522015-07-17 16:38:25 -0700181 disabled via the --disable-cache-oblivious configure option, and queried via
182 the "config.cache_oblivious" mallctl.
Jason Evans54673fd2015-02-23 22:28:43 -0800183 - Micro-optimize the fast paths for the public API functions.
184 - Refactor thread-specific data to reside in a single structure. This assures
185 that only a single TLS read is necessary per call into the public API.
186 - Implement in-place huge allocation growing and shrinking.
187 - Refactor rtree (radix tree for chunk lookups) to be lock-free, and make
188 additional optimizations that reduce maximum lookup depth to one or two
189 levels. This resolves what was a concurrency bottleneck for per arena huge
190 allocation, because a global data structure is critical for determining
191 which arenas own which huge allocations.
192
193 Incompatible changes:
194 - Replace --enable-cc-silence with --disable-cc-silence to suppress spurious
195 warnings by default.
196 - Assure that the constness of malloc_usable_size()'s return type matches that
197 of the system implementation.
198 - Change the heap profile dump format to support per thread heap profiling,
Jason Evans70417202015-05-01 12:31:12 -0700199 rename pprof to jeprof, and enhance it with the --thread=<n> option. As a
200 result, the bundled jeprof must now be used rather than the upstream
201 (gperftools) pprof.
Jason Evans54673fd2015-02-23 22:28:43 -0800202 - Disable "opt.prof_final" by default, in order to avoid atexit(3), which can
203 internally deadlock on some platforms.
204 - Change the "arenas.nlruns" mallctl type from size_t to unsigned.
205 - Replace the "stats.arenas.<i>.bins.<j>.allocated" mallctl with
206 "stats.arenas.<i>.bins.<j>.curregs".
207 - Ignore MALLOC_CONF in set{uid,gid,cap} binaries.
208 - Ignore MALLOCX_ARENA(a) in dallocx(), in favor of using the
209 MALLOCX_TCACHE(tc) and MALLOCX_TCACHE_NONE flags to control tcache usage.
210
211 Removed features:
212 - Remove the *allocm() API, which is superseded by the *allocx() API.
213 - Remove the --enable-dss options, and make dss non-optional on all platforms
214 which support sbrk(2).
215 - Remove the "arenas.purge" mallctl, which was obsoleted by the
216 "arena.<i>.purge" mallctl in 3.1.0.
217 - Remove the unnecessary "opt.valgrind" mallctl; jemalloc automatically
218 detects whether it is running inside Valgrind.
219 - Remove the "stats.huge.allocated", "stats.huge.nmalloc", and
220 "stats.huge.ndalloc" mallctls.
221 - Remove the --enable-mremap option.
Jason Evans54673fd2015-02-23 22:28:43 -0800222 - Remove the "stats.chunks.current", "stats.chunks.total", and
223 "stats.chunks.high" mallctls.
224
225 Bug fixes:
226 - Fix the cactive statistic to decrease (rather than increase) when active
227 memory decreases. This regression was first released in 3.5.0.
228 - Fix OOM handling in memalign() and valloc(). A variant of this bug existed
229 in all releases since 2.0.0, which introduced these functions.
Jason Evans32dca112015-07-09 11:34:13 -0700230 - Fix an OOM-related regression in arena_tcache_fill_small(), which could
231 cause cache corruption on OOM. This regression was present in all releases
232 from 2.2.0 through 3.6.0.
Jason Evans241abc62015-06-23 18:47:07 -0700233 - Fix size class overflow handling for malloc(), posix_memalign(), memalign(),
234 calloc(), and realloc() when profiling is enabled.
Jason Evans54673fd2015-02-23 22:28:43 -0800235 - Fix the "arena.<i>.dss" mallctl to return an error if "primary" or
236 "secondary" precedence is specified, but sbrk(2) is not supported.
237 - Fix fallback lg_floor() implementations to handle extremely large inputs.
238 - Ensure the default purgeable zone is after the default zone on OS X.
239 - Fix latent bugs in atomic_*().
240 - Fix the "arena.<i>.dss" mallctl to handle read-only calls.
241 - Fix tls_model configuration to enable the initial-exec model when possible.
242 - Mark malloc_conf as a weak symbol so that the application can override it.
243 - Correctly detect glibc's adaptive pthread mutexes.
244 - Fix the --without-export configure option.
245
Jason Evansff536312014-03-31 09:23:10 -0700246* 3.6.0 (March 31, 2014)
247
248 This version contains a critical bug fix for a regression present in 3.5.0 and
249 3.5.1.
250
251 Bug fixes:
252 - Fix a regression in arena_chunk_alloc() that caused crashes during
253 small/large allocation if chunk allocation failed. In the absence of this
254 bug, chunk allocation failure would result in allocation failure, e.g. NULL
255 return from malloc(). This regression was introduced in 3.5.0.
256 - Fix backtracing for gcc intrinsics-based backtracing by specifying
257 -fno-omit-frame-pointer to gcc. Note that the application (and all the
258 libraries it links to) must also be compiled with this option for
259 backtracing to be reliable.
260 - Use dss allocation precedence for huge allocations as well as small/large
261 allocations.
Jason Evans54673fd2015-02-23 22:28:43 -0800262 - Fix test assertion failure message formatting. This bug did not manifest on
Jason Evansff536312014-03-31 09:23:10 -0700263 x86_64 systems because of implementation subtleties in va_list.
264 - Fix inconsequential test failures for hash and SFMT code.
265
266 New features:
267 - Support heap profiling on FreeBSD. This feature depends on the proc
268 filesystem being mounted during heap profile dumping.
269
Jason Evansb9ec5c92014-02-25 16:43:51 -0800270* 3.5.1 (February 25, 2014)
271
272 This version primarily addresses minor bugs in test code.
273
274 Bug fixes:
275 - Configure Solaris/Illumos to use MADV_FREE.
276 - Fix junk filling for mremap(2)-based huge reallocation. This is only
277 relevant if configuring with the --enable-mremap option specified.
278 - Avoid compilation failure if 'restrict' C99 keyword is not supported by the
279 compiler.
280 - Add a configure test for SSE2 rather than assuming it is usable on i686
281 systems. This fixes test compilation errors, especially on 32-bit Linux
282 systems.
283 - Fix mallctl argument size mismatches (size_t vs. uint64_t) in the stats unit
284 test.
285 - Fix/remove flawed alignment-related overflow tests.
286 - Prevent compiler optimizations that could change backtraces in the
287 prof_accum unit test.
Jason Evans379f8472010-10-24 16:18:29 -0700288
Jason Evans798a4812014-01-22 11:09:50 -0800289* 3.5.0 (January 22, 2014)
Jason Evans86abd0d2013-11-30 15:25:42 -0800290
Jason Evans264dfd32014-01-17 17:01:23 -0800291 This version focuses on refactoring and automated testing, though it also
292 includes some non-trivial heap profiling optimizations not mentioned below.
293
294 New features:
295 - Add the *allocx() API, which is a successor to the experimental *allocm()
296 API. The *allocx() functions are slightly simpler to use because they have
297 fewer parameters, they directly return the results of primary interest, and
298 mallocx()/rallocx() avoid the strict aliasing pitfall that
Jason Evans9c8baec2014-01-22 13:08:47 -0800299 allocm()/rallocm() share with posix_memalign(). Note that *allocm() is
Jason Evans264dfd32014-01-17 17:01:23 -0800300 slated for removal in the next non-bugfix release.
301 - Add support for LinuxThreads.
302
Jason Evans86abd0d2013-11-30 15:25:42 -0800303 Bug fixes:
Jason Evansd37d5ad2013-12-05 23:01:50 -0800304 - Unless heap profiling is enabled, disable floating point code and don't link
305 with libm. This, in combination with e.g. EXTRA_CFLAGS=-mno-sse on x64
306 systems, makes it possible to completely disable floating point register
307 use. Some versions of glibc neglect to save/restore caller-saved floating
308 point registers during dynamic lazy symbol loading, and the symbol loading
309 code uses whatever malloc the application happens to have linked/loaded
310 with, the result being potential floating point register corruption.
Jason Evans264dfd32014-01-17 17:01:23 -0800311 - Report ENOMEM rather than EINVAL if an OOM occurs during heap profiling
312 backtrace creation in imemalign(). This bug impacted posix_memalign() and
313 aligned_alloc().
314 - Fix a file descriptor leak in a prof_dump_maps() error path.
315 - Fix prof_dump() to close the dump file descriptor for all relevant error
316 paths.
317 - Fix rallocm() to use the arena specified by the ALLOCM_ARENA(s) flag for
318 allocation, not just deallocation.
319 - Fix a data race for large allocation stats counters.
320 - Fix a potential infinite loop during thread exit. This bug occurred on
321 Solaris, and could affect other platforms with similar pthreads TSD
322 implementations.
323 - Don't junk-fill reallocations unless usable size changes. This fixes a
324 violation of the *allocx()/*allocm() semantics.
325 - Fix growing large reallocation to junk fill new space.
326 - Fix huge deallocation to junk fill when munmap is disabled.
Jason Evans86abd0d2013-11-30 15:25:42 -0800327 - Change the default private namespace prefix from empty to je_, and change
328 --with-private-namespace-prefix so that it prepends an additional prefix
329 rather than replacing je_. This reduces the likelihood of applications
330 which statically link jemalloc experiencing symbol name collisions.
Jason Evans264dfd32014-01-17 17:01:23 -0800331 - Add missing private namespace mangling (relevant when
332 --with-private-namespace is specified).
333 - Add and use JEMALLOC_INLINE_C so that static inline functions are marked as
334 static even for debug builds.
335 - Add a missing mutex unlock in a malloc_init_hard() error path. In practice
336 this error path is never executed.
337 - Fix numerous bugs in malloc_strotumax() error handling/reporting. These
338 bugs had no impact except for malformed inputs.
339 - Fix numerous bugs in malloc_snprintf(). These bugs were not exercised by
340 existing calls, so they had no impact.
Jason Evans86abd0d2013-11-30 15:25:42 -0800341
Jason Evans0f7ba3f2013-10-20 19:40:09 -0700342* 3.4.1 (October 20, 2013)
Jason Evansff08ef72013-10-19 21:41:10 -0700343
344 Bug fixes:
Jason Evans7b651802013-10-20 14:09:54 -0700345 - Fix a race in the "arenas.extend" mallctl that could cause memory corruption
346 of internal data structures and subsequent crashes.
Jason Evansdda90f52013-10-19 23:48:40 -0700347 - Fix Valgrind integration flaws that caused Valgrind warnings about reads of
348 uninitialized memory in:
349 + arena chunk headers
350 + internal zero-initialized data structures (relevant to tcache and prof
351 code)
Jason Evansff08ef72013-10-19 21:41:10 -0700352 - Preserve errno during the first allocation. A readlink(2) call during
353 initialization fails unless /etc/malloc.conf exists, so errno was typically
354 set during the first allocation prior to this fix.
355 - Fix compilation warnings reported by gcc 4.8.1.
356
Jason Evans765cc2b2013-06-02 20:58:00 -0700357* 3.4.0 (June 2, 2013)
358
359 This version is essentially a small bugfix release, but the addition of
360 aarch64 support requires that the minor version be incremented.
361
362 Bug fixes:
363 - Fix race-triggered deadlocks in chunk_record(). These deadlocks were
364 typically triggered by multiple threads concurrently deallocating huge
365 objects.
366
367 New features:
368 - Add support for the aarch64 architecture.
369
Jason Evans22988352013-03-06 11:11:17 -0800370* 3.3.1 (March 6, 2013)
371
372 This version fixes bugs that are typically encountered only when utilizing
373 custom run-time options.
Jason Evansbbe29d32013-01-30 15:03:11 -0800374
375 Bug fixes:
Jason Evans88c222c2013-02-06 11:59:30 -0800376 - Fix a locking order bug that could cause deadlock during fork if heap
377 profiling were enabled.
Jason Evansa7a28c32013-01-31 16:53:58 -0800378 - Fix a chunk recycling bug that could cause the allocator to lose track of
Jason Evans765cc2b2013-06-02 20:58:00 -0700379 whether a chunk was zeroed. On FreeBSD, NetBSD, and OS X, it could cause
Jason Evansa7a28c32013-01-31 16:53:58 -0800380 corruption if allocating via sbrk(2) (unlikely unless running with the
381 "dss:primary" option specified). This was completely harmless on Linux
382 unless using mlockall(2) (and unlikely even then, unless the
383 --disable-munmap configure option or the "dss:primary" option was
384 specified). This regression was introduced in 3.1.0 by the
385 mlockall(2)/madvise(2) interaction fix.
Jason Evansbbe29d32013-01-30 15:03:11 -0800386 - Fix TLS-related memory corruption that could occur during thread exit if the
387 thread never allocated memory. Only the quarantine and prof facilities were
388 susceptible.
Jason Evansd0e942e2013-01-31 14:42:41 -0800389 - Fix two quarantine bugs:
390 + Internal reallocation of the quarantined object array leaked the old
391 array.
392 + Reallocation failure for internal reallocation of the quarantined object
393 array (very unlikely) resulted in memory corruption.
Jason Evans06912752013-01-31 17:02:53 -0800394 - Fix Valgrind integration to annotate all internally allocated memory in a
395 way that keeps Valgrind happy about internal data structure access.
Jason Evans22988352013-03-06 11:11:17 -0800396 - Fix building for s390 systems.
Jason Evansbbe29d32013-01-30 15:03:11 -0800397
Jason Evansb5681fb2013-01-22 22:45:09 -0800398* 3.3.0 (January 23, 2013)
399
400 This version includes a few minor performance improvements in addition to the
401 listed new features and bug fixes.
402
403 New features:
404 - Add clipping support to lg_chunk option processing.
405 - Add the --enable-ivsalloc option.
406 - Add the --without-export option.
407 - Add the --disable-zone-allocator option.
Jason Evans6eb84fb2012-11-29 22:13:04 -0800408
409 Bug fixes:
410 - Fix "arenas.extend" mallctl to output the number of arenas.
Jason Evansa33488d2013-10-03 14:38:39 -0700411 - Fix chunk_recycle() to unconditionally inform Valgrind that returned memory
Jason Evans12711852012-12-12 10:12:18 -0800412 is undefined.
Jason Evansb5681fb2013-01-22 22:45:09 -0800413 - Fix build break on FreeBSD related to alloca.h.
Jason Evans6eb84fb2012-11-29 22:13:04 -0800414
Jason Evans556ddc72012-11-07 15:16:29 -0800415* 3.2.0 (November 9, 2012)
416
417 In addition to a couple of bug fixes, this version modifies page run
418 allocation and dirty page purging algorithms in order to better control
419 page-level virtual memory fragmentation.
Jason Evans12efefb2012-10-16 22:06:56 -0700420
Jason Evanse3d13062012-10-30 15:42:37 -0700421 Incompatible changes:
Jason Evans556ddc72012-11-07 15:16:29 -0800422 - Change the "opt.lg_dirty_mult" default from 5 to 3 (32:1 to 8:1).
Jason Evanse3d13062012-10-30 15:42:37 -0700423
Jason Evans12efefb2012-10-16 22:06:56 -0700424 Bug fixes:
425 - Fix dss/mmap allocation precedence code to use recyclable mmap memory only
426 after primary dss allocation fails.
Jason Evanse3d13062012-10-30 15:42:37 -0700427 - Fix deadlock in the "arenas.purge" mallctl. This regression was introduced
428 in 3.1.0 by the addition of the "arena.<i>.purge" mallctl.
Jason Evans12efefb2012-10-16 22:06:56 -0700429
Jason Evans2b592b02012-10-16 10:12:40 -0700430* 3.1.0 (October 16, 2012)
Jason Evans3860eac2012-05-15 13:53:21 -0700431
Jason Evans781fe752012-05-15 14:48:14 -0700432 New features:
433 - Auto-detect whether running inside Valgrind, thus removing the need to
434 manually specify MALLOC_CONF=valgrind:true.
Jason Evans2b592b02012-10-16 10:12:40 -0700435 - Add the "arenas.extend" mallctl, which allows applications to create
436 manually managed arenas.
437 - Add the ALLOCM_ARENA() flag for {,r,d}allocm().
438 - Add the "opt.dss", "arena.<i>.dss", and "stats.arenas.<i>.dss" mallctls,
439 which provide control over dss/mmap precedence.
440 - Add the "arena.<i>.purge" mallctl, which obsoletes "arenas.purge".
441 - Define LG_QUANTUM for hppa.
Jason Evans781fe752012-05-15 14:48:14 -0700442
Jason Evans174b70e2012-05-15 23:31:53 -0700443 Incompatible changes:
444 - Disable tcache by default if running inside Valgrind, in order to avoid
445 making unallocated objects appear reachable to Valgrind.
Jason Evans2b592b02012-10-16 10:12:40 -0700446 - Drop const from malloc_usable_size() argument on Linux.
Jason Evans174b70e2012-05-15 23:31:53 -0700447
Jason Evans3860eac2012-05-15 13:53:21 -0700448 Bug fixes:
449 - Fix heap profiling crash if sampled object is freed via realloc(p, 0).
Jason Evans5c710ce2012-05-23 16:09:22 -0700450 - Remove const from __*_hook variable declarations, so that glibc can modify
451 them during process forking.
Jason Evans2b592b02012-10-16 10:12:40 -0700452 - Fix mlockall(2)/madvise(2) interaction.
453 - Fix fork(2)-related deadlocks.
454 - Fix error return value for "thread.tcache.enabled" mallctl.
Jason Evans3860eac2012-05-15 13:53:21 -0700455
Jason Evanscbb71ca2012-05-11 17:00:20 -0700456* 3.0.0 (May 11, 2012)
Jason Evans9ef7f5d2012-04-16 18:16:48 -0700457
458 Although this version adds some major new features, the primary focus is on
459 internal code cleanup that facilitates maintainability and portability, most
460 of which is not reflected in the ChangeLog. This is the first release to
461 incorporate substantial contributions from numerous other developers, and the
462 result is a more broadly useful allocator (see the git revision history for
463 contribution details). Note that the license has been unified, thanks to
464 Facebook granting a license under the same terms as the other copyright
465 holders (see COPYING).
466
467 New features:
468 - Implement Valgrind support, redzones, and quarantine.
Jason Evans079687b2012-04-23 12:49:23 -0700469 - Add support for additional platforms:
Jason Evans9ef7f5d2012-04-16 18:16:48 -0700470 + FreeBSD
471 + Mac OS X Lion
Jason Evans40f514f2012-04-22 16:21:06 -0700472 + MinGW
Jason Evanscbb71ca2012-05-11 17:00:20 -0700473 + Windows (no support yet for replacing the system malloc)
Jason Evans9ef7f5d2012-04-16 18:16:48 -0700474 - Add support for additional architectures:
475 + MIPS
476 + SH4
477 + Tilera
478 - Add support for cross compiling.
479 - Add nallocm(), which rounds a request size up to the nearest size class
480 without actually allocating.
481 - Implement aligned_alloc() (blame C11).
Jason Evans9ef7f5d2012-04-16 18:16:48 -0700482 - Add the "thread.tcache.enabled" mallctl.
Jason Evans0b25fe72012-04-17 16:39:33 -0700483 - Add the "opt.prof_final" mallctl.
Jason Evans25a000e2012-04-17 15:49:30 -0700484 - Update pprof (from gperftools 2.0).
Jason Evanscbb71ca2012-05-11 17:00:20 -0700485 - Add the --with-mangling option.
486 - Add the --disable-experimental option.
487 - Add the --disable-munmap option, and make it the default on Linux.
488 - Add the --enable-mremap option, which disables use of mremap(2) by default.
Jason Evans9ef7f5d2012-04-16 18:16:48 -0700489
490 Incompatible changes:
491 - Enable stats by default.
492 - Enable fill by default.
493 - Disable lazy locking by default.
494 - Rename the "tcache.flush" mallctl to "thread.tcache.flush".
495 - Rename the "arenas.pagesize" mallctl to "arenas.page".
Jason Evans0b25fe72012-04-17 16:39:33 -0700496 - Change the "opt.lg_prof_sample" default from 0 to 19 (1 B to 512 KiB).
497 - Change the "opt.prof_accum" default from true to false.
Jason Evans9ef7f5d2012-04-16 18:16:48 -0700498
499 Removed features:
500 - Remove the swap feature, including the "config.swap", "swap.avail",
501 "swap.prezeroed", "swap.nfds", and "swap.fds" mallctls.
502 - Remove highruns statistics, including the
503 "stats.arenas.<i>.bins.<j>.highruns" and
504 "stats.arenas.<i>.lruns.<j>.highruns" mallctls.
505 - As part of small size class refactoring, remove the "opt.lg_[qc]space_max",
506 "arenas.cacheline", "arenas.subpage", "arenas.[tqcs]space_{min,max}", and
507 "arenas.[tqcs]bins" mallctls.
508 - Remove the "arenas.chunksize" mallctl.
509 - Remove the "opt.lg_prof_tcmax" option.
510 - Remove the "opt.lg_prof_bt_max" option.
511 - Remove the "opt.lg_tcache_gc_sweep" option.
512 - Remove the --disable-tiny option, including the "config.tiny" mallctl.
513 - Remove the --enable-dynamic-page-shift configure option.
514 - Remove the --enable-sysv configure option.
515
516 Bug fixes:
Jason Evans9ef7f5d2012-04-16 18:16:48 -0700517 - Fix a statistics-related bug in the "thread.arena" mallctl that could cause
518 invalid statistics and crashes.
Jason Evans079687b2012-04-23 12:49:23 -0700519 - Work around TLS deallocation via free() on Linux. This bug could cause
Jason Evans9ef7f5d2012-04-16 18:16:48 -0700520 write-after-free memory corruption.
Jason Evans52386b22012-04-22 16:00:11 -0700521 - Fix a potential deadlock that could occur during interval- and
522 growth-triggered heap profile dumps.
Jason Evansd8ceef62012-05-10 20:59:39 -0700523 - Fix large calloc() zeroing bugs due to dropping chunk map unzeroed flags.
Jason Evans8f0e0eb2012-04-21 13:33:48 -0700524 - Fix chunk_alloc_dss() to stop claiming memory is zeroed. This bug could
525 cause memory corruption and crashes with --enable-dss specified.
Jason Evans52386b22012-04-22 16:00:11 -0700526 - Fix fork-related bugs that could cause deadlock in children between fork
527 and exec.
Jason Evans9ef7f5d2012-04-16 18:16:48 -0700528 - Fix malloc_stats_print() to honor 'b' and 'l' in the opts parameter.
529 - Fix realloc(p, 0) to act like free(p).
530 - Do not enforce minimum alignment in memalign().
531 - Check for NULL pointer in malloc_usable_size().
Jason Evans52386b22012-04-22 16:00:11 -0700532 - Fix an off-by-one heap profile statistics bug that could be observed in
533 interval- and growth-triggered heap profiles.
Jason Evans6b9ed672012-04-25 13:12:46 -0700534 - Fix the "epoch" mallctl to update cached stats even if the passed in epoch
535 is 0.
Jason Evans9ef7f5d2012-04-16 18:16:48 -0700536 - Fix bin->runcur management to fix a layout policy bug. This bug did not
537 affect correctness.
538 - Fix a bug in choose_arena_hard() that potentially caused more arenas to be
539 initialized than necessary.
540 - Add missing "opt.lg_tcache_max" mallctl implementation.
541 - Use glibc allocator hooks to make mixed allocator usage less likely.
542 - Fix build issues for --disable-tcache.
Jason Evans918d6e22012-04-20 13:42:21 -0700543 - Don't mangle pthread_create() when --with-private-namespace is specified.
Jason Evans9ef7f5d2012-04-16 18:16:48 -0700544
Jason Evansb3bd8852011-11-14 17:12:45 -0800545* 2.2.5 (November 14, 2011)
546
547 Bug fixes:
548 - Fix huge_ralloc() race when using mremap(2). This is a serious bug that
549 could cause memory corruption and/or crashes.
550 - Fix huge_ralloc() to maintain chunk statistics.
551 - Fix malloc_stats_print(..., "a") output.
552
Jason Evansca9ee1a2011-11-05 21:46:23 -0700553* 2.2.4 (November 5, 2011)
554
555 Bug fixes:
556 - Initialize arenas_tsd before using it. This bug existed for 2.2.[0-3], as
557 well as for --disable-tls builds in earlier releases.
558 - Do not assume a 4 KiB page size in test/rallocm.c.
559
Jason Evansc67e4fd2011-08-31 15:19:13 -0700560* 2.2.3 (August 31, 2011)
561
562 This version fixes numerous bugs related to heap profiling.
563
564 Bug fixes:
565 - Fix a prof-related race condition. This bug could cause memory corruption,
566 but only occurred in non-default configurations (prof_accum:false).
567 - Fix off-by-one backtracing issues (make sure that prof_alloc_prep() is
568 excluded from backtraces).
569 - Fix a prof-related bug in realloc() (only triggered by OOM errors).
570 - Fix prof-related bugs in allocm() and rallocm().
571 - Fix prof_tdata_cleanup() for --disable-tls builds.
572 - Fix a relative include path, to fix objdir builds.
573
Jason Evans4c484812011-07-30 16:59:13 -0700574* 2.2.2 (July 30, 2011)
575
576 Bug fixes:
577 - Fix a build error for --disable-tcache.
578 - Fix assertions in arena_purge() (for real this time).
579 - Add the --with-private-namespace option. This is a workaround for symbol
580 conflicts that can inadvertently arise when using static libraries.
581
Jason Evans7d9ebea2011-03-30 15:01:08 -0700582* 2.2.1 (March 30, 2011)
583
584 Bug fixes:
585 - Implement atomic operations for x86/x64. This fixes compilation failures
586 for versions of gcc that are still in wide use.
587 - Fix an assertion in arena_purge().
588
Jason Evans4bcd9872011-03-22 15:30:22 -0700589* 2.2.0 (March 22, 2011)
590
591 This version incorporates several improvements to algorithms and data
592 structures that tend to reduce fragmentation and increase speed.
593
594 New features:
595 - Add the "stats.cactive" mallctl.
596 - Update pprof (from google-perftools 1.7).
597 - Improve backtracing-related configuration logic, and add the
598 --disable-prof-libgcc option.
599
600 Bug fixes:
601 - Change default symbol visibility from "internal", to "hidden", which
602 decreases the overhead of library-internal function calls.
603 - Fix symbol visibility so that it is also set on OS X.
604 - Fix a build dependency regression caused by the introduction of the .pic.o
605 suffix for PIC object files.
606 - Add missing checks for mutex initialization failures.
607 - Don't use libgcc-based backtracing except on x64, where it is known to work.
608 - Fix deadlocks on OS X that were due to memory allocation in
609 pthread_mutex_lock().
610 - Heap profiling-specific fixes:
611 + Fix memory corruption due to integer overflow in small region index
612 computation, when using a small enough sample interval that profiling
613 context pointers are stored in small run headers.
614 + Fix a bootstrap ordering bug that only occurred with TLS disabled.
615 + Fix a rallocm() rsize bug.
616 + Fix error detection bugs for aligned memory allocation.
617
Jason Evans0e4d0d12011-03-14 16:41:03 -0700618* 2.1.3 (March 14, 2011)
619
620 Bug fixes:
621 - Fix a cpp logic regression (due to the "thread.{de,}allocatedp" mallctl fix
622 for OS X in 2.1.2).
623 - Fix a "thread.arena" mallctl bug.
624 - Fix a thread cache stats merging bug.
625
je6e56e5e2011-03-02 11:23:41 -0800626* 2.1.2 (March 2, 2011)
627
628 Bug fixes:
629 - Fix "thread.{de,}allocatedp" mallctl for OS X.
630 - Add missing jemalloc.a to build system.
631
Jason Evans63692862011-02-07 22:48:35 -0800632* 2.1.1 (January 31, 2011)
Jason Evansada55b22011-01-31 20:08:56 -0800633
Jason Evans63692862011-02-07 22:48:35 -0800634 Bug fixes:
Jason Evansada55b22011-01-31 20:08:56 -0800635 - Fix aligned huge reallocation (affected allocm()).
636 - Fix the ALLOCM_LG_ALIGN macro definition.
637 - Fix a heap dumping deadlock.
638 - Fix a "thread.arena" mallctl bug.
639
Jason Evans63692862011-02-07 22:48:35 -0800640* 2.1.0 (December 3, 2010)
Jason Evans0e8d3d22010-12-03 17:02:16 -0800641
642 This version incorporates some optimizations that can't quite be considered
643 bug fixes.
644
645 New features:
646 - Use Linux's mremap(2) for huge object reallocation when possible.
647 - Avoid locking in mallctl*() when possible.
648 - Add the "thread.[de]allocatedp" mallctl's.
649 - Convert the manual page source from roff to DocBook, and generate both roff
650 and HTML manuals.
651
652 Bug fixes:
653 - Fix a crash due to incorrect bootstrap ordering. This only impacted
654 --enable-debug --enable-dss configurations.
655 - Fix a minor statistics bug for mallctl("swap.avail", ...).
656
Jason Evans63692862011-02-07 22:48:35 -0800657* 2.0.1 (October 29, 2010)
Jason Evans53806fe2010-10-29 20:16:39 -0700658
659 Bug fixes:
660 - Fix a race condition in heap profiling that could cause undefined behavior
Jason Evansada55b22011-01-31 20:08:56 -0800661 if "opt.prof_accum" were disabled.
Jason Evans53806fe2010-10-29 20:16:39 -0700662 - Add missing mutex unlocks for some OOM error paths in the heap profiling
663 code.
664 - Fix a compilation error for non-C99 builds.
665
Jason Evans63692862011-02-07 22:48:35 -0800666* 2.0.0 (October 24, 2010)
Jason Evans379f8472010-10-24 16:18:29 -0700667
668 This version focuses on the experimental *allocm() API, and on improved
669 run-time configuration/introspection. Nonetheless, numerous performance
670 improvements are also included.
671
672 New features:
Jason Evansb059a532010-10-24 16:54:40 -0700673 - Implement the experimental {,r,s,d}allocm() API, which provides a superset
674 of the functionality available via malloc(), calloc(), posix_memalign(),
675 realloc(), malloc_usable_size(), and free(). These functions can be used to
676 allocate/reallocate aligned zeroed memory, ask for optional extra memory
677 during reallocation, prevent object movement during reallocation, etc.
678 - Replace JEMALLOC_OPTIONS/JEMALLOC_PROF_PREFIX with MALLOC_CONF, which is
679 more human-readable, and more flexible. For example:
680 JEMALLOC_OPTIONS=AJP
681 is now:
682 MALLOC_CONF=abort:true,fill:true,stats_print:true
683 - Port to Apple OS X. Sponsored by Mozilla.
684 - Make it possible for the application to control thread-->arena mappings via
685 the "thread.arena" mallctl.
686 - Add compile-time support for all TLS-related functionality via pthreads TSD.
687 This is mainly of interest for OS X, which does not support TLS, but has a
688 TSD implementation with similar performance.
689 - Override memalign() and valloc() if they are provided by the system.
690 - Add the "arenas.purge" mallctl, which can be used to synchronously purge all
691 dirty unused pages.
692 - Make cumulative heap profiling data optional, so that it is possible to
693 limit the amount of memory consumed by heap profiling data structures.
694 - Add per thread allocation counters that can be accessed via the
695 "thread.allocated" and "thread.deallocated" mallctls.
Jason Evans379f8472010-10-24 16:18:29 -0700696
697 Incompatible changes:
Jason Evansb059a532010-10-24 16:54:40 -0700698 - Remove JEMALLOC_OPTIONS and malloc_options (see MALLOC_CONF above).
699 - Increase default backtrace depth from 4 to 128 for heap profiling.
700 - Disable interval-based profile dumps by default.
Jason Evans379f8472010-10-24 16:18:29 -0700701
702 Bug fixes:
703 - Remove bad assertions in fork handler functions. These assertions could
704 cause aborts for some combinations of configure settings.
705 - Fix strerror_r() usage to deal with non-standard semantics in GNU libc.
706 - Fix leak context reporting. This bug tended to cause the number of contexts
707 to be underreported (though the reported number of objects and bytes were
708 correct).
709 - Fix a realloc() bug for large in-place growing reallocation. This bug could
710 cause memory corruption, but it was hard to trigger.
711 - Fix an allocation bug for small allocations that could be triggered if
712 multiple threads raced to create a new run of backing pages.
713 - Enhance the heap profiler to trigger samples based on usable size, rather
714 than request size.
715 - Fix a heap profiling bug due to sometimes losing track of requested object
716 size for sampled objects.
717
Jason Evans63692862011-02-07 22:48:35 -0800718* 1.0.3 (August 12, 2010)
Jason Evans379f8472010-10-24 16:18:29 -0700719
720 Bug fixes:
721 - Fix the libunwind-based implementation of stack backtracing (used for heap
722 profiling). This bug could cause zero-length backtraces to be reported.
723 - Add a missing mutex unlock in library initialization code. If multiple
724 threads raced to initialize malloc, some of them could end up permanently
725 blocked.
726
Jason Evans63692862011-02-07 22:48:35 -0800727* 1.0.2 (May 11, 2010)
Jason Evans379f8472010-10-24 16:18:29 -0700728
729 Bug fixes:
730 - Fix junk filling of large objects, which could cause memory corruption.
731 - Add MAP_NORESERVE support for chunk mapping, because otherwise virtual
732 memory limits could cause swap file configuration to fail. Contributed by
733 Jordan DeLong.
734
Jason Evans63692862011-02-07 22:48:35 -0800735* 1.0.1 (April 14, 2010)
Jason Evans379f8472010-10-24 16:18:29 -0700736
737 Bug fixes:
738 - Fix compilation when --enable-fill is specified.
739 - Fix threads-related profiling bugs that affected accuracy and caused memory
740 to be leaked during thread exit.
741 - Fix dirty page purging race conditions that could cause crashes.
742 - Fix crash in tcache flushing code during thread destruction.
743
Jason Evans63692862011-02-07 22:48:35 -0800744* 1.0.0 (April 11, 2010)
Jason Evans379f8472010-10-24 16:18:29 -0700745
746 This release focuses on speed and run-time introspection. Numerous
747 algorithmic improvements make this release substantially faster than its
748 predecessors.
749
750 New features:
751 - Implement autoconf-based configuration system.
752 - Add mallctl*(), for the purposes of introspection and run-time
753 configuration.
754 - Make it possible for the application to manually flush a thread's cache, via
755 the "tcache.flush" mallctl.
756 - Base maximum dirty page count on proportion of active memory.
charsyamad6800f2015-07-04 01:06:06 +0900757 - Compute various additional run-time statistics, including per size class
Jason Evans379f8472010-10-24 16:18:29 -0700758 statistics for large objects.
759 - Expose malloc_stats_print(), which can be called repeatedly by the
760 application.
761 - Simplify the malloc_message() signature to only take one string argument,
762 and incorporate an opaque data pointer argument for use by the application
763 in combination with malloc_stats_print().
764 - Add support for allocation backed by one or more swap files, and allow the
765 application to disable over-commit if swap files are in use.
766 - Implement allocation profiling and leak checking.
767
768 Removed features:
769 - Remove the dynamic arena rebalancing code, since thread-specific caching
770 reduces its utility.
771
772 Bug fixes:
773 - Modify chunk allocation to work when address space layout randomization
774 (ASLR) is in use.
775 - Fix thread cleanup bugs related to TLS destruction.
776 - Handle 0-size allocation requests in posix_memalign().
777 - Fix a chunk leak. The leaked chunks were never touched, so this impacted
778 virtual memory usage, but not physical memory usage.
779
Jason Evans63692862011-02-07 22:48:35 -0800780* linux_2008082[78]a (August 27/28, 2008)
Jason Evans379f8472010-10-24 16:18:29 -0700781
782 These snapshot releases are the simple result of incorporating Linux-specific
783 support into the FreeBSD malloc sources.
784
785--------------------------------------------------------------------------------
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