| | 1 | Following are change highlights associated with official releases. Important |
| | 2 | bug fixes are all mentioned, but internal enhancements are omitted here for |
| | 3 | brevity (even though they are more fun to write about). Much more detail can be |
| | 4 | found in the git revision history: |
| | 5 | |
| | 6 | http://www.canonware.com/cgi-bin/gitweb.cgi?p=jemalloc.git |
| | 7 | git://canonware.com/jemalloc.git |
| | 8 | |
| | 9 | * 2.2.5 (November 14, 2011) |
| | 10 | |
| | 11 | Bug fixes: |
| | 12 | - Fix huge_ralloc() race when using mremap(2). This is a serious bug that |
| | 13 | could cause memory corruption and/or crashes. |
| | 14 | - Fix huge_ralloc() to maintain chunk statistics. |
| | 15 | - Fix malloc_stats_print(..., "a") output. |
| | 16 | |
| | 17 | * 2.2.4 (November 5, 2011) |
| | 18 | |
| | 19 | Bug fixes: |
| | 20 | - Initialize arenas_tsd before using it. This bug existed for 2.2.[0-3], as |
| | 21 | well as for --disable-tls builds in earlier releases. |
| | 22 | - Do not assume a 4 KiB page size in test/rallocm.c. |
| | 23 | |
| | 24 | * 2.2.3 (August 31, 2011) |
| | 25 | |
| | 26 | This version fixes numerous bugs related to heap profiling. |
| | 27 | |
| | 28 | Bug fixes: |
| | 29 | - Fix a prof-related race condition. This bug could cause memory corruption, |
| | 30 | but only occurred in non-default configurations (prof_accum:false). |
| | 31 | - Fix off-by-one backtracing issues (make sure that prof_alloc_prep() is |
| | 32 | excluded from backtraces). |
| | 33 | - Fix a prof-related bug in realloc() (only triggered by OOM errors). |
| | 34 | - Fix prof-related bugs in allocm() and rallocm(). |
| | 35 | - Fix prof_tdata_cleanup() for --disable-tls builds. |
| | 36 | - Fix a relative include path, to fix objdir builds. |
| | 37 | |
| | 38 | * 2.2.2 (July 30, 2011) |
| | 39 | |
| | 40 | Bug fixes: |
| | 41 | - Fix a build error for --disable-tcache. |
| | 42 | - Fix assertions in arena_purge() (for real this time). |
| | 43 | - Add the --with-private-namespace option. This is a workaround for symbol |
| | 44 | conflicts that can inadvertently arise when using static libraries. |
| | 45 | |
| | 46 | * 2.2.1 (March 30, 2011) |
| | 47 | |
| | 48 | Bug fixes: |
| | 49 | - Implement atomic operations for x86/x64. This fixes compilation failures |
| | 50 | for versions of gcc that are still in wide use. |
| | 51 | - Fix an assertion in arena_purge(). |
| | 52 | |
| | 53 | * 2.2.0 (March 22, 2011) |
| | 54 | |
| | 55 | This version incorporates several improvements to algorithms and data |
| | 56 | structures that tend to reduce fragmentation and increase speed. |
| | 57 | |
| | 58 | New features: |
| | 59 | - Add the "stats.cactive" mallctl. |
| | 60 | - Update pprof (from google-perftools 1.7). |
| | 61 | - Improve backtracing-related configuration logic, and add the |
| | 62 | --disable-prof-libgcc option. |
| | 63 | |
| | 64 | Bug fixes: |
| | 65 | - Change default symbol visibility from "internal", to "hidden", which |
| | 66 | decreases the overhead of library-internal function calls. |
| | 67 | - Fix symbol visibility so that it is also set on OS X. |
| | 68 | - Fix a build dependency regression caused by the introduction of the .pic.o |
| | 69 | suffix for PIC object files. |
| | 70 | - Add missing checks for mutex initialization failures. |
| | 71 | - Don't use libgcc-based backtracing except on x64, where it is known to work. |
| | 72 | - Fix deadlocks on OS X that were due to memory allocation in |
| | 73 | pthread_mutex_lock(). |
| | 74 | - Heap profiling-specific fixes: |
| | 75 | + Fix memory corruption due to integer overflow in small region index |
| | 76 | computation, when using a small enough sample interval that profiling |
| | 77 | context pointers are stored in small run headers. |
| | 78 | + Fix a bootstrap ordering bug that only occurred with TLS disabled. |
| | 79 | + Fix a rallocm() rsize bug. |
| | 80 | + Fix error detection bugs for aligned memory allocation. |
| | 81 | |
| | 82 | * 2.1.3 (March 14, 2011) |
| | 83 | |
| | 84 | Bug fixes: |
| | 85 | - Fix a cpp logic regression (due to the "thread.{de,}allocatedp" mallctl fix |
| | 86 | for OS X in 2.1.2). |
| | 87 | - Fix a "thread.arena" mallctl bug. |
| | 88 | - Fix a thread cache stats merging bug. |
| | 89 | |
| | 90 | * 2.1.2 (March 2, 2011) |
| | 91 | |
| | 92 | Bug fixes: |
| | 93 | - Fix "thread.{de,}allocatedp" mallctl for OS X. |
| | 94 | - Add missing jemalloc.a to build system. |
| | 95 | |
| | 96 | * 2.1.1 (January 31, 2011) |
| | 97 | |
| | 98 | Bug fixes: |
| | 99 | - Fix aligned huge reallocation (affected allocm()). |
| | 100 | - Fix the ALLOCM_LG_ALIGN macro definition. |
| | 101 | - Fix a heap dumping deadlock. |
| | 102 | - Fix a "thread.arena" mallctl bug. |
| | 103 | |
| | 104 | * 2.1.0 (December 3, 2010) |
| | 105 | |
| | 106 | This version incorporates some optimizations that can't quite be considered |
| | 107 | bug fixes. |
| | 108 | |
| | 109 | New features: |
| | 110 | - Use Linux's mremap(2) for huge object reallocation when possible. |
| | 111 | - Avoid locking in mallctl*() when possible. |
| | 112 | - Add the "thread.[de]allocatedp" mallctl's. |
| | 113 | - Convert the manual page source from roff to DocBook, and generate both roff |
| | 114 | and HTML manuals. |
| | 115 | |
| | 116 | Bug fixes: |
| | 117 | - Fix a crash due to incorrect bootstrap ordering. This only impacted |
| | 118 | --enable-debug --enable-dss configurations. |
| | 119 | - Fix a minor statistics bug for mallctl("swap.avail", ...). |
| | 120 | |
| | 121 | * 2.0.1 (October 29, 2010) |
| | 122 | |
| | 123 | Bug fixes: |
| | 124 | - Fix a race condition in heap profiling that could cause undefined behavior |
| | 125 | if "opt.prof_accum" were disabled. |
| | 126 | - Add missing mutex unlocks for some OOM error paths in the heap profiling |
| | 127 | code. |
| | 128 | - Fix a compilation error for non-C99 builds. |
| | 129 | |
| | 130 | * 2.0.0 (October 24, 2010) |
| | 131 | |
| | 132 | This version focuses on the experimental *allocm() API, and on improved |
| | 133 | run-time configuration/introspection. Nonetheless, numerous performance |
| | 134 | improvements are also included. |
| | 135 | |
| | 136 | New features: |
| | 137 | - Implement the experimental {,r,s,d}allocm() API, which provides a superset |
| | 138 | of the functionality available via malloc(), calloc(), posix_memalign(), |
| | 139 | realloc(), malloc_usable_size(), and free(). These functions can be used to |
| | 140 | allocate/reallocate aligned zeroed memory, ask for optional extra memory |
| | 141 | during reallocation, prevent object movement during reallocation, etc. |
| | 142 | - Replace JEMALLOC_OPTIONS/JEMALLOC_PROF_PREFIX with MALLOC_CONF, which is |
| | 143 | more human-readable, and more flexible. For example: |
| | 144 | JEMALLOC_OPTIONS=AJP |
| | 145 | is now: |
| | 146 | MALLOC_CONF=abort:true,fill:true,stats_print:true |
| | 147 | - Port to Apple OS X. Sponsored by Mozilla. |
| | 148 | - Make it possible for the application to control thread-->arena mappings via |
| | 149 | the "thread.arena" mallctl. |
| | 150 | - Add compile-time support for all TLS-related functionality via pthreads TSD. |
| | 151 | This is mainly of interest for OS X, which does not support TLS, but has a |
| | 152 | TSD implementation with similar performance. |
| | 153 | - Override memalign() and valloc() if they are provided by the system. |
| | 154 | - Add the "arenas.purge" mallctl, which can be used to synchronously purge all |
| | 155 | dirty unused pages. |
| | 156 | - Make cumulative heap profiling data optional, so that it is possible to |
| | 157 | limit the amount of memory consumed by heap profiling data structures. |
| | 158 | - Add per thread allocation counters that can be accessed via the |
| | 159 | "thread.allocated" and "thread.deallocated" mallctls. |
| | 160 | |
| | 161 | Incompatible changes: |
| | 162 | - Remove JEMALLOC_OPTIONS and malloc_options (see MALLOC_CONF above). |
| | 163 | - Increase default backtrace depth from 4 to 128 for heap profiling. |
| | 164 | - Disable interval-based profile dumps by default. |
| | 165 | |
| | 166 | Bug fixes: |
| | 167 | - Remove bad assertions in fork handler functions. These assertions could |
| | 168 | cause aborts for some combinations of configure settings. |
| | 169 | - Fix strerror_r() usage to deal with non-standard semantics in GNU libc. |
| | 170 | - Fix leak context reporting. This bug tended to cause the number of contexts |
| | 171 | to be underreported (though the reported number of objects and bytes were |
| | 172 | correct). |
| | 173 | - Fix a realloc() bug for large in-place growing reallocation. This bug could |
| | 174 | cause memory corruption, but it was hard to trigger. |
| | 175 | - Fix an allocation bug for small allocations that could be triggered if |
| | 176 | multiple threads raced to create a new run of backing pages. |
| | 177 | - Enhance the heap profiler to trigger samples based on usable size, rather |
| | 178 | than request size. |
| | 179 | - Fix a heap profiling bug due to sometimes losing track of requested object |
| | 180 | size for sampled objects. |
| | 181 | |
| | 182 | * 1.0.3 (August 12, 2010) |
| | 183 | |
| | 184 | Bug fixes: |
| | 185 | - Fix the libunwind-based implementation of stack backtracing (used for heap |
| | 186 | profiling). This bug could cause zero-length backtraces to be reported. |
| | 187 | - Add a missing mutex unlock in library initialization code. If multiple |
| | 188 | threads raced to initialize malloc, some of them could end up permanently |
| | 189 | blocked. |
| | 190 | |
| | 191 | * 1.0.2 (May 11, 2010) |
| | 192 | |
| | 193 | Bug fixes: |
| | 194 | - Fix junk filling of large objects, which could cause memory corruption. |
| | 195 | - Add MAP_NORESERVE support for chunk mapping, because otherwise virtual |
| | 196 | memory limits could cause swap file configuration to fail. Contributed by |
| | 197 | Jordan DeLong. |
| | 198 | |
| | 199 | * 1.0.1 (April 14, 2010) |
| | 200 | |
| | 201 | Bug fixes: |
| | 202 | - Fix compilation when --enable-fill is specified. |
| | 203 | - Fix threads-related profiling bugs that affected accuracy and caused memory |
| | 204 | to be leaked during thread exit. |
| | 205 | - Fix dirty page purging race conditions that could cause crashes. |
| | 206 | - Fix crash in tcache flushing code during thread destruction. |
| | 207 | |
| | 208 | * 1.0.0 (April 11, 2010) |
| | 209 | |
| | 210 | This release focuses on speed and run-time introspection. Numerous |
| | 211 | algorithmic improvements make this release substantially faster than its |
| | 212 | predecessors. |
| | 213 | |
| | 214 | New features: |
| | 215 | - Implement autoconf-based configuration system. |
| | 216 | - Add mallctl*(), for the purposes of introspection and run-time |
| | 217 | configuration. |
| | 218 | - Make it possible for the application to manually flush a thread's cache, via |
| | 219 | the "tcache.flush" mallctl. |
| | 220 | - Base maximum dirty page count on proportion of active memory. |
| | 221 | - Compute various addtional run-time statistics, including per size class |
| | 222 | statistics for large objects. |
| | 223 | - Expose malloc_stats_print(), which can be called repeatedly by the |
| | 224 | application. |
| | 225 | - Simplify the malloc_message() signature to only take one string argument, |
| | 226 | and incorporate an opaque data pointer argument for use by the application |
| | 227 | in combination with malloc_stats_print(). |
| | 228 | - Add support for allocation backed by one or more swap files, and allow the |
| | 229 | application to disable over-commit if swap files are in use. |
| | 230 | - Implement allocation profiling and leak checking. |
| | 231 | |
| | 232 | Removed features: |
| | 233 | - Remove the dynamic arena rebalancing code, since thread-specific caching |
| | 234 | reduces its utility. |
| | 235 | |
| | 236 | Bug fixes: |
| | 237 | - Modify chunk allocation to work when address space layout randomization |
| | 238 | (ASLR) is in use. |
| | 239 | - Fix thread cleanup bugs related to TLS destruction. |
| | 240 | - Handle 0-size allocation requests in posix_memalign(). |
| | 241 | - Fix a chunk leak. The leaked chunks were never touched, so this impacted |
| | 242 | virtual memory usage, but not physical memory usage. |
| | 243 | |
| | 244 | * linux_2008082[78]a (August 27/28, 2008) |
| | 245 | |
| | 246 | These snapshot releases are the simple result of incorporating Linux-specific |
| | 247 | support into the FreeBSD malloc sources. |
| | 248 | |
| | 249 | -------------------------------------------------------------------------------- |
| | 250 | vim:filetype=text:textwidth=80 |
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