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