| Following are change highlights associated with official releases. Important |
| bug fixes are all mentioned, but some internal enhancements are omitted here for |
| brevity. Much more detail can be found in the git revision history: |
| |
| https://github.com/jemalloc/jemalloc |
| |
| * 4.0.1 (XXX) |
| |
| Bug fixes: |
| - Fix arenas_cache_cleanup() and arena_get_hard() to handle |
| allocation/deallocation within the application's thread-specific data |
| cleanup functions even after arenas_cache is torn down. |
| - Don't bitshift by negative amounts when encoding/decoding run sizes in chunk |
| header maps. This affected systems with page sizes greater than 8 KiB. |
| - Rename index_t to szind_t to avoid an existing type on Solaris. |
| - Add JEMALLOC_CXX_THROW to the memalign() function prototype, in order to |
| match glibc and avoid compilation errors when including both |
| jemalloc/jemalloc.h and malloc.h in C++ code. |
| |
| * 4.0.0 (August 17, 2015) |
| |
| This version contains many speed and space optimizations, both minor and |
| major. The major themes are generalization, unification, and simplification. |
| Although many of these optimizations cause no visible behavior change, their |
| cumulative effect is substantial. |
| |
| New features: |
| - Normalize size class spacing to be consistent across the complete size |
| range. By default there are four size classes per size doubling, but this |
| is now configurable via the --with-lg-size-class-group option. Also add the |
| --with-lg-page, --with-lg-page-sizes, --with-lg-quantum, and |
| --with-lg-tiny-min options, which can be used to tweak page and size class |
| settings. Impacts: |
| + Worst case performance for incrementally growing/shrinking reallocation |
| is improved because there are far fewer size classes, and therefore |
| copying happens less often. |
| + Internal fragmentation is limited to 20% for all but the smallest size |
| classes (those less than four times the quantum). (1B + 4 KiB) |
| and (1B + 4 MiB) previously suffered nearly 50% internal fragmentation. |
| + Chunk fragmentation tends to be lower because there are fewer distinct run |
| sizes to pack. |
| - Add support for explicit tcaches. The "tcache.create", "tcache.flush", and |
| "tcache.destroy" mallctls control tcache lifetime and flushing, and the |
| MALLOCX_TCACHE(tc) and MALLOCX_TCACHE_NONE flags to the *allocx() API |
| control which tcache is used for each operation. |
| - Implement per thread heap profiling, as well as the ability to |
| enable/disable heap profiling on a per thread basis. Add the "prof.reset", |
| "prof.lg_sample", "thread.prof.name", "thread.prof.active", |
| "opt.prof_thread_active_init", "prof.thread_active_init", and |
| "thread.prof.active" mallctls. |
| - Add support for per arena application-specified chunk allocators, configured |
| via the "arena.<i>.chunk_hooks" mallctl. |
| - Refactor huge allocation to be managed by arenas, so that arenas now |
| function as general purpose independent allocators. This is important in |
| the context of user-specified chunk allocators, aside from the scalability |
| benefits. Related new statistics: |
| + The "stats.arenas.<i>.huge.allocated", "stats.arenas.<i>.huge.nmalloc", |
| "stats.arenas.<i>.huge.ndalloc", and "stats.arenas.<i>.huge.nrequests" |
| mallctls provide high level per arena huge allocation statistics. |
| + The "arenas.nhchunks", "arenas.hchunk.<i>.size", |
| "stats.arenas.<i>.hchunks.<j>.nmalloc", |
| "stats.arenas.<i>.hchunks.<j>.ndalloc", |
| "stats.arenas.<i>.hchunks.<j>.nrequests", and |
| "stats.arenas.<i>.hchunks.<j>.curhchunks" mallctls provide per size class |
| statistics. |
| - Add the 'util' column to malloc_stats_print() output, which reports the |
| proportion of available regions that are currently in use for each small |
| size class. |
| - Add "alloc" and "free" modes for for junk filling (see the "opt.junk" |
| mallctl), so that it is possible to separately enable junk filling for |
| allocation versus deallocation. |
| - Add the jemalloc-config script, which provides information about how |
| jemalloc was configured, and how to integrate it into application builds. |
| - Add metadata statistics, which are accessible via the "stats.metadata", |
| "stats.arenas.<i>.metadata.mapped", and |
| "stats.arenas.<i>.metadata.allocated" mallctls. |
| - Add the "stats.resident" mallctl, which reports the upper limit of |
| physically resident memory mapped by the allocator. |
| - Add per arena control over unused dirty page purging, via the |
| "arenas.lg_dirty_mult", "arena.<i>.lg_dirty_mult", and |
| "stats.arenas.<i>.lg_dirty_mult" mallctls. |
| - Add the "prof.gdump" mallctl, which makes it possible to toggle the gdump |
| feature on/off during program execution. |
| - Add sdallocx(), which implements sized deallocation. The primary |
| optimization over dallocx() is the removal of a metadata read, which often |
| suffers an L1 cache miss. |
| - Add missing header includes in jemalloc/jemalloc.h, so that applications |
| only have to #include <jemalloc/jemalloc.h>. |
| - Add support for additional platforms: |
| + Bitrig |
| + Cygwin |
| + DragonFlyBSD |
| + iOS |
| + OpenBSD |
| + OpenRISC/or1k |
| |
| Optimizations: |
| - Maintain dirty runs in per arena LRUs rather than in per arena trees of |
| dirty-run-containing chunks. In practice this change significantly reduces |
| dirty page purging volume. |
| - Integrate whole chunks into the unused dirty page purging machinery. This |
| reduces the cost of repeated huge allocation/deallocation, because it |
| effectively introduces a cache of chunks. |
| - Split the arena chunk map into two separate arrays, in order to increase |
| cache locality for the frequently accessed bits. |
| - Move small run metadata out of runs, into arena chunk headers. This reduces |
| run fragmentation, smaller runs reduce external fragmentation for small size |
| classes, and packed (less uniformly aligned) metadata layout improves CPU |
| cache set distribution. |
| - Randomly distribute large allocation base pointer alignment relative to page |
| boundaries in order to more uniformly utilize CPU cache sets. This can be |
| disabled via the --disable-cache-oblivious configure option, and queried via |
| the "config.cache_oblivious" mallctl. |
| - Micro-optimize the fast paths for the public API functions. |
| - Refactor thread-specific data to reside in a single structure. This assures |
| that only a single TLS read is necessary per call into the public API. |
| - Implement in-place huge allocation growing and shrinking. |
| - Refactor rtree (radix tree for chunk lookups) to be lock-free, and make |
| additional optimizations that reduce maximum lookup depth to one or two |
| levels. This resolves what was a concurrency bottleneck for per arena huge |
| allocation, because a global data structure is critical for determining |
| which arenas own which huge allocations. |
| |
| Incompatible changes: |
| - Replace --enable-cc-silence with --disable-cc-silence to suppress spurious |
| warnings by default. |
| - Assure that the constness of malloc_usable_size()'s return type matches that |
| of the system implementation. |
| - Change the heap profile dump format to support per thread heap profiling, |
| rename pprof to jeprof, and enhance it with the --thread=<n> option. As a |
| result, the bundled jeprof must now be used rather than the upstream |
| (gperftools) pprof. |
| - Disable "opt.prof_final" by default, in order to avoid atexit(3), which can |
| internally deadlock on some platforms. |
| - Change the "arenas.nlruns" mallctl type from size_t to unsigned. |
| - Replace the "stats.arenas.<i>.bins.<j>.allocated" mallctl with |
| "stats.arenas.<i>.bins.<j>.curregs". |
| - Ignore MALLOC_CONF in set{uid,gid,cap} binaries. |
| - Ignore MALLOCX_ARENA(a) in dallocx(), in favor of using the |
| MALLOCX_TCACHE(tc) and MALLOCX_TCACHE_NONE flags to control tcache usage. |
| |
| Removed features: |
| - Remove the *allocm() API, which is superseded by the *allocx() API. |
| - Remove the --enable-dss options, and make dss non-optional on all platforms |
| which support sbrk(2). |
| - Remove the "arenas.purge" mallctl, which was obsoleted by the |
| "arena.<i>.purge" mallctl in 3.1.0. |
| - Remove the unnecessary "opt.valgrind" mallctl; jemalloc automatically |
| detects whether it is running inside Valgrind. |
| - Remove the "stats.huge.allocated", "stats.huge.nmalloc", and |
| "stats.huge.ndalloc" mallctls. |
| - Remove the --enable-mremap option. |
| - Remove the "stats.chunks.current", "stats.chunks.total", and |
| "stats.chunks.high" mallctls. |
| |
| Bug fixes: |
| - Fix the cactive statistic to decrease (rather than increase) when active |
| memory decreases. This regression was first released in 3.5.0. |
| - Fix OOM handling in memalign() and valloc(). A variant of this bug existed |
| in all releases since 2.0.0, which introduced these functions. |
| - Fix an OOM-related regression in arena_tcache_fill_small(), which could |
| cause cache corruption on OOM. This regression was present in all releases |
| from 2.2.0 through 3.6.0. |
| - Fix size class overflow handling for malloc(), posix_memalign(), memalign(), |
| calloc(), and realloc() when profiling is enabled. |
| - Fix the "arena.<i>.dss" mallctl to return an error if "primary" or |
| "secondary" precedence is specified, but sbrk(2) is not supported. |
| - Fix fallback lg_floor() implementations to handle extremely large inputs. |
| - Ensure the default purgeable zone is after the default zone on OS X. |
| - Fix latent bugs in atomic_*(). |
| - Fix the "arena.<i>.dss" mallctl to handle read-only calls. |
| - Fix tls_model configuration to enable the initial-exec model when possible. |
| - Mark malloc_conf as a weak symbol so that the application can override it. |
| - Correctly detect glibc's adaptive pthread mutexes. |
| - Fix the --without-export configure option. |
| |
| * 3.6.0 (March 31, 2014) |
| |
| This version contains a critical bug fix for a regression present in 3.5.0 and |
| 3.5.1. |
| |
| Bug fixes: |
| - Fix a regression in arena_chunk_alloc() that caused crashes during |
| small/large allocation if chunk allocation failed. In the absence of this |
| bug, chunk allocation failure would result in allocation failure, e.g. NULL |
| return from malloc(). This regression was introduced in 3.5.0. |
| - Fix backtracing for gcc intrinsics-based backtracing by specifying |
| -fno-omit-frame-pointer to gcc. Note that the application (and all the |
| libraries it links to) must also be compiled with this option for |
| backtracing to be reliable. |
| - Use dss allocation precedence for huge allocations as well as small/large |
| allocations. |
| - Fix test assertion failure message formatting. This bug did not manifest on |
| x86_64 systems because of implementation subtleties in va_list. |
| - Fix inconsequential test failures for hash and SFMT code. |
| |
| New features: |
| - Support heap profiling on FreeBSD. This feature depends on the proc |
| filesystem being mounted during heap profile dumping. |
| |
| * 3.5.1 (February 25, 2014) |
| |
| This version primarily addresses minor bugs in test code. |
| |
| Bug fixes: |
| - Configure Solaris/Illumos to use MADV_FREE. |
| - Fix junk filling for mremap(2)-based huge reallocation. This is only |
| relevant if configuring with the --enable-mremap option specified. |
| - Avoid compilation failure if 'restrict' C99 keyword is not supported by the |
| compiler. |
| - Add a configure test for SSE2 rather than assuming it is usable on i686 |
| systems. This fixes test compilation errors, especially on 32-bit Linux |
| systems. |
| - Fix mallctl argument size mismatches (size_t vs. uint64_t) in the stats unit |
| test. |
| - Fix/remove flawed alignment-related overflow tests. |
| - Prevent compiler optimizations that could change backtraces in the |
| prof_accum unit test. |
| |
| * 3.5.0 (January 22, 2014) |
| |
| This version focuses on refactoring and automated testing, though it also |
| includes some non-trivial heap profiling optimizations not mentioned below. |
| |
| New features: |
| - Add the *allocx() API, which is a successor to the experimental *allocm() |
| API. The *allocx() functions are slightly simpler to use because they have |
| fewer parameters, they directly return the results of primary interest, and |
| mallocx()/rallocx() avoid the strict aliasing pitfall that |
| allocm()/rallocm() share with posix_memalign(). Note that *allocm() is |
| slated for removal in the next non-bugfix release. |
| - Add support for LinuxThreads. |
| |
| Bug fixes: |
| - Unless heap profiling is enabled, disable floating point code and don't link |
| with libm. This, in combination with e.g. EXTRA_CFLAGS=-mno-sse on x64 |
| systems, makes it possible to completely disable floating point register |
| use. Some versions of glibc neglect to save/restore caller-saved floating |
| point registers during dynamic lazy symbol loading, and the symbol loading |
| code uses whatever malloc the application happens to have linked/loaded |
| with, the result being potential floating point register corruption. |
| - Report ENOMEM rather than EINVAL if an OOM occurs during heap profiling |
| backtrace creation in imemalign(). This bug impacted posix_memalign() and |
| aligned_alloc(). |
| - Fix a file descriptor leak in a prof_dump_maps() error path. |
| - Fix prof_dump() to close the dump file descriptor for all relevant error |
| paths. |
| - Fix rallocm() to use the arena specified by the ALLOCM_ARENA(s) flag for |
| allocation, not just deallocation. |
| - Fix a data race for large allocation stats counters. |
| - Fix a potential infinite loop during thread exit. This bug occurred on |
| Solaris, and could affect other platforms with similar pthreads TSD |
| implementations. |
| - Don't junk-fill reallocations unless usable size changes. This fixes a |
| violation of the *allocx()/*allocm() semantics. |
| - Fix growing large reallocation to junk fill new space. |
| - Fix huge deallocation to junk fill when munmap is disabled. |
| - Change the default private namespace prefix from empty to je_, and change |
| --with-private-namespace-prefix so that it prepends an additional prefix |
| rather than replacing je_. This reduces the likelihood of applications |
| which statically link jemalloc experiencing symbol name collisions. |
| - Add missing private namespace mangling (relevant when |
| --with-private-namespace is specified). |
| - Add and use JEMALLOC_INLINE_C so that static inline functions are marked as |
| static even for debug builds. |
| - Add a missing mutex unlock in a malloc_init_hard() error path. In practice |
| this error path is never executed. |
| - Fix numerous bugs in malloc_strotumax() error handling/reporting. These |
| bugs had no impact except for malformed inputs. |
| - Fix numerous bugs in malloc_snprintf(). These bugs were not exercised by |
| existing calls, so they had no impact. |
| |
| * 3.4.1 (October 20, 2013) |
| |
| Bug fixes: |
| - Fix a race in the "arenas.extend" mallctl that could cause memory corruption |
| of internal data structures and subsequent crashes. |
| - Fix Valgrind integration flaws that caused Valgrind warnings about reads of |
| uninitialized memory in: |
| + arena chunk headers |
| + internal zero-initialized data structures (relevant to tcache and prof |
| code) |
| - Preserve errno during the first allocation. A readlink(2) call during |
| initialization fails unless /etc/malloc.conf exists, so errno was typically |
| set during the first allocation prior to this fix. |
| - Fix compilation warnings reported by gcc 4.8.1. |
| |
| * 3.4.0 (June 2, 2013) |
| |
| This version is essentially a small bugfix release, but the addition of |
| aarch64 support requires that the minor version be incremented. |
| |
| Bug fixes: |
| - Fix race-triggered deadlocks in chunk_record(). These deadlocks were |
| typically triggered by multiple threads concurrently deallocating huge |
| objects. |
| |
| New features: |
| - Add support for the aarch64 architecture. |
| |
| * 3.3.1 (March 6, 2013) |
| |
| This version fixes bugs that are typically encountered only when utilizing |
| custom run-time options. |
| |
| Bug fixes: |
| - Fix a locking order bug that could cause deadlock during fork if heap |
| profiling were enabled. |
| - Fix a chunk recycling bug that could cause the allocator to lose track of |
| whether a chunk was zeroed. On FreeBSD, NetBSD, and OS X, it could cause |
| corruption if allocating via sbrk(2) (unlikely unless running with the |
| "dss:primary" option specified). This was completely harmless on Linux |
| unless using mlockall(2) (and unlikely even then, unless the |
| --disable-munmap configure option or the "dss:primary" option was |
| specified). This regression was introduced in 3.1.0 by the |
| mlockall(2)/madvise(2) interaction fix. |
| - Fix TLS-related memory corruption that could occur during thread exit if the |
| thread never allocated memory. Only the quarantine and prof facilities were |
| susceptible. |
| - Fix two quarantine bugs: |
| + Internal reallocation of the quarantined object array leaked the old |
| array. |
| + Reallocation failure for internal reallocation of the quarantined object |
| array (very unlikely) resulted in memory corruption. |
| - Fix Valgrind integration to annotate all internally allocated memory in a |
| way that keeps Valgrind happy about internal data structure access. |
| - Fix building for s390 systems. |
| |
| * 3.3.0 (January 23, 2013) |
| |
| This version includes a few minor performance improvements in addition to the |
| listed new features and bug fixes. |
| |
| New features: |
| - Add clipping support to lg_chunk option processing. |
| - Add the --enable-ivsalloc option. |
| - Add the --without-export option. |
| - Add the --disable-zone-allocator option. |
| |
| Bug fixes: |
| - Fix "arenas.extend" mallctl to output the number of arenas. |
| - Fix chunk_recycle() to unconditionally inform Valgrind that returned memory |
| is undefined. |
| - Fix build break on FreeBSD related to alloca.h. |
| |
| * 3.2.0 (November 9, 2012) |
| |
| In addition to a couple of bug fixes, this version modifies page run |
| allocation and dirty page purging algorithms in order to better control |
| page-level virtual memory fragmentation. |
| |
| Incompatible changes: |
| - Change the "opt.lg_dirty_mult" default from 5 to 3 (32:1 to 8:1). |
| |
| Bug fixes: |
| - Fix dss/mmap allocation precedence code to use recyclable mmap memory only |
| after primary dss allocation fails. |
| - Fix deadlock in the "arenas.purge" mallctl. This regression was introduced |
| in 3.1.0 by the addition of the "arena.<i>.purge" mallctl. |
| |
| * 3.1.0 (October 16, 2012) |
| |
| New features: |
| - Auto-detect whether running inside Valgrind, thus removing the need to |
| manually specify MALLOC_CONF=valgrind:true. |
| - Add the "arenas.extend" mallctl, which allows applications to create |
| manually managed arenas. |
| - Add the ALLOCM_ARENA() flag for {,r,d}allocm(). |
| - Add the "opt.dss", "arena.<i>.dss", and "stats.arenas.<i>.dss" mallctls, |
| which provide control over dss/mmap precedence. |
| - Add the "arena.<i>.purge" mallctl, which obsoletes "arenas.purge". |
| - Define LG_QUANTUM for hppa. |
| |
| Incompatible changes: |
| - Disable tcache by default if running inside Valgrind, in order to avoid |
| making unallocated objects appear reachable to Valgrind. |
| - Drop const from malloc_usable_size() argument on Linux. |
| |
| Bug fixes: |
| - Fix heap profiling crash if sampled object is freed via realloc(p, 0). |
| - Remove const from __*_hook variable declarations, so that glibc can modify |
| them during process forking. |
| - Fix mlockall(2)/madvise(2) interaction. |
| - Fix fork(2)-related deadlocks. |
| - Fix error return value for "thread.tcache.enabled" mallctl. |
| |
| * 3.0.0 (May 11, 2012) |
| |
| Although this version adds some major new features, the primary focus is on |
| internal code cleanup that facilitates maintainability and portability, most |
| of which is not reflected in the ChangeLog. This is the first release to |
| incorporate substantial contributions from numerous other developers, and the |
| result is a more broadly useful allocator (see the git revision history for |
| contribution details). Note that the license has been unified, thanks to |
| Facebook granting a license under the same terms as the other copyright |
| holders (see COPYING). |
| |
| New features: |
| - Implement Valgrind support, redzones, and quarantine. |
| - Add support for additional platforms: |
| + FreeBSD |
| + Mac OS X Lion |
| + MinGW |
| + Windows (no support yet for replacing the system malloc) |
| - Add support for additional architectures: |
| + MIPS |
| + SH4 |
| + Tilera |
| - Add support for cross compiling. |
| - Add nallocm(), which rounds a request size up to the nearest size class |
| without actually allocating. |
| - Implement aligned_alloc() (blame C11). |
| - Add the "thread.tcache.enabled" mallctl. |
| - Add the "opt.prof_final" mallctl. |
| - Update pprof (from gperftools 2.0). |
| - Add the --with-mangling option. |
| - Add the --disable-experimental option. |
| - Add the --disable-munmap option, and make it the default on Linux. |
| - Add the --enable-mremap option, which disables use of mremap(2) by default. |
| |
| Incompatible changes: |
| - Enable stats by default. |
| - Enable fill by default. |
| - Disable lazy locking by default. |
| - Rename the "tcache.flush" mallctl to "thread.tcache.flush". |
| - Rename the "arenas.pagesize" mallctl to "arenas.page". |
| - Change the "opt.lg_prof_sample" default from 0 to 19 (1 B to 512 KiB). |
| - Change the "opt.prof_accum" default from true to false. |
| |
| Removed features: |
| - Remove the swap feature, including the "config.swap", "swap.avail", |
| "swap.prezeroed", "swap.nfds", and "swap.fds" mallctls. |
| - Remove highruns statistics, including the |
| "stats.arenas.<i>.bins.<j>.highruns" and |
| "stats.arenas.<i>.lruns.<j>.highruns" mallctls. |
| - As part of small size class refactoring, remove the "opt.lg_[qc]space_max", |
| "arenas.cacheline", "arenas.subpage", "arenas.[tqcs]space_{min,max}", and |
| "arenas.[tqcs]bins" mallctls. |
| - Remove the "arenas.chunksize" mallctl. |
| - Remove the "opt.lg_prof_tcmax" option. |
| - Remove the "opt.lg_prof_bt_max" option. |
| - Remove the "opt.lg_tcache_gc_sweep" option. |
| - Remove the --disable-tiny option, including the "config.tiny" mallctl. |
| - Remove the --enable-dynamic-page-shift configure option. |
| - Remove the --enable-sysv configure option. |
| |
| Bug fixes: |
| - Fix a statistics-related bug in the "thread.arena" mallctl that could cause |
| invalid statistics and crashes. |
| - Work around TLS deallocation via free() on Linux. This bug could cause |
| write-after-free memory corruption. |
| - Fix a potential deadlock that could occur during interval- and |
| growth-triggered heap profile dumps. |
| - Fix large calloc() zeroing bugs due to dropping chunk map unzeroed flags. |
| - Fix chunk_alloc_dss() to stop claiming memory is zeroed. This bug could |
| cause memory corruption and crashes with --enable-dss specified. |
| - Fix fork-related bugs that could cause deadlock in children between fork |
| and exec. |
| - Fix malloc_stats_print() to honor 'b' and 'l' in the opts parameter. |
| - Fix realloc(p, 0) to act like free(p). |
| - Do not enforce minimum alignment in memalign(). |
| - Check for NULL pointer in malloc_usable_size(). |
| - Fix an off-by-one heap profile statistics bug that could be observed in |
| interval- and growth-triggered heap profiles. |
| - Fix the "epoch" mallctl to update cached stats even if the passed in epoch |
| is 0. |
| - Fix bin->runcur management to fix a layout policy bug. This bug did not |
| affect correctness. |
| - Fix a bug in choose_arena_hard() that potentially caused more arenas to be |
| initialized than necessary. |
| - Add missing "opt.lg_tcache_max" mallctl implementation. |
| - Use glibc allocator hooks to make mixed allocator usage less likely. |
| - Fix build issues for --disable-tcache. |
| - Don't mangle pthread_create() when --with-private-namespace is specified. |
| |
| * 2.2.5 (November 14, 2011) |
| |
| Bug fixes: |
| - Fix huge_ralloc() race when using mremap(2). This is a serious bug that |
| could cause memory corruption and/or crashes. |
| - Fix huge_ralloc() to maintain chunk statistics. |
| - Fix malloc_stats_print(..., "a") output. |
| |
| * 2.2.4 (November 5, 2011) |
| |
| Bug fixes: |
| - Initialize arenas_tsd before using it. This bug existed for 2.2.[0-3], as |
| well as for --disable-tls builds in earlier releases. |
| - Do not assume a 4 KiB page size in test/rallocm.c. |
| |
| * 2.2.3 (August 31, 2011) |
| |
| This version fixes numerous bugs related to heap profiling. |
| |
| Bug fixes: |
| - Fix a prof-related race condition. This bug could cause memory corruption, |
| but only occurred in non-default configurations (prof_accum:false). |
| - Fix off-by-one backtracing issues (make sure that prof_alloc_prep() is |
| excluded from backtraces). |
| - Fix a prof-related bug in realloc() (only triggered by OOM errors). |
| - Fix prof-related bugs in allocm() and rallocm(). |
| - Fix prof_tdata_cleanup() for --disable-tls builds. |
| - Fix a relative include path, to fix objdir builds. |
| |
| * 2.2.2 (July 30, 2011) |
| |
| Bug fixes: |
| - Fix a build error for --disable-tcache. |
| - Fix assertions in arena_purge() (for real this time). |
| - Add the --with-private-namespace option. This is a workaround for symbol |
| conflicts that can inadvertently arise when using static libraries. |
| |
| * 2.2.1 (March 30, 2011) |
| |
| Bug fixes: |
| - Implement atomic operations for x86/x64. This fixes compilation failures |
| for versions of gcc that are still in wide use. |
| - Fix an assertion in arena_purge(). |
| |
| * 2.2.0 (March 22, 2011) |
| |
| This version incorporates several improvements to algorithms and data |
| structures that tend to reduce fragmentation and increase speed. |
| |
| New features: |
| - Add the "stats.cactive" mallctl. |
| - Update pprof (from google-perftools 1.7). |
| - Improve backtracing-related configuration logic, and add the |
| --disable-prof-libgcc option. |
| |
| Bug fixes: |
| - Change default symbol visibility from "internal", to "hidden", which |
| decreases the overhead of library-internal function calls. |
| - Fix symbol visibility so that it is also set on OS X. |
| - Fix a build dependency regression caused by the introduction of the .pic.o |
| suffix for PIC object files. |
| - Add missing checks for mutex initialization failures. |
| - Don't use libgcc-based backtracing except on x64, where it is known to work. |
| - Fix deadlocks on OS X that were due to memory allocation in |
| pthread_mutex_lock(). |
| - Heap profiling-specific fixes: |
| + Fix memory corruption due to integer overflow in small region index |
| computation, when using a small enough sample interval that profiling |
| context pointers are stored in small run headers. |
| + Fix a bootstrap ordering bug that only occurred with TLS disabled. |
| + Fix a rallocm() rsize bug. |
| + Fix error detection bugs for aligned memory allocation. |
| |
| * 2.1.3 (March 14, 2011) |
| |
| Bug fixes: |
| - Fix a cpp logic regression (due to the "thread.{de,}allocatedp" mallctl fix |
| for OS X in 2.1.2). |
| - Fix a "thread.arena" mallctl bug. |
| - Fix a thread cache stats merging bug. |
| |
| * 2.1.2 (March 2, 2011) |
| |
| Bug fixes: |
| - Fix "thread.{de,}allocatedp" mallctl for OS X. |
| - Add missing jemalloc.a to build system. |
| |
| * 2.1.1 (January 31, 2011) |
| |
| Bug fixes: |
| - Fix aligned huge reallocation (affected allocm()). |
| - Fix the ALLOCM_LG_ALIGN macro definition. |
| - Fix a heap dumping deadlock. |
| - Fix a "thread.arena" mallctl bug. |
| |
| * 2.1.0 (December 3, 2010) |
| |
| This version incorporates some optimizations that can't quite be considered |
| bug fixes. |
| |
| New features: |
| - Use Linux's mremap(2) for huge object reallocation when possible. |
| - Avoid locking in mallctl*() when possible. |
| - Add the "thread.[de]allocatedp" mallctl's. |
| - Convert the manual page source from roff to DocBook, and generate both roff |
| and HTML manuals. |
| |
| Bug fixes: |
| - Fix a crash due to incorrect bootstrap ordering. This only impacted |
| --enable-debug --enable-dss configurations. |
| - Fix a minor statistics bug for mallctl("swap.avail", ...). |
| |
| * 2.0.1 (October 29, 2010) |
| |
| Bug fixes: |
| - Fix a race condition in heap profiling that could cause undefined behavior |
| if "opt.prof_accum" were disabled. |
| - Add missing mutex unlocks for some OOM error paths in the heap profiling |
| code. |
| - Fix a compilation error for non-C99 builds. |
| |
| * 2.0.0 (October 24, 2010) |
| |
| This version focuses on the experimental *allocm() API, and on improved |
| run-time configuration/introspection. Nonetheless, numerous performance |
| improvements are also included. |
| |
| New features: |
| - Implement the experimental {,r,s,d}allocm() API, which provides a superset |
| of the functionality available via malloc(), calloc(), posix_memalign(), |
| realloc(), malloc_usable_size(), and free(). These functions can be used to |
| allocate/reallocate aligned zeroed memory, ask for optional extra memory |
| during reallocation, prevent object movement during reallocation, etc. |
| - Replace JEMALLOC_OPTIONS/JEMALLOC_PROF_PREFIX with MALLOC_CONF, which is |
| more human-readable, and more flexible. For example: |
| JEMALLOC_OPTIONS=AJP |
| is now: |
| MALLOC_CONF=abort:true,fill:true,stats_print:true |
| - Port to Apple OS X. Sponsored by Mozilla. |
| - Make it possible for the application to control thread-->arena mappings via |
| the "thread.arena" mallctl. |
| - Add compile-time support for all TLS-related functionality via pthreads TSD. |
| This is mainly of interest for OS X, which does not support TLS, but has a |
| TSD implementation with similar performance. |
| - Override memalign() and valloc() if they are provided by the system. |
| - Add the "arenas.purge" mallctl, which can be used to synchronously purge all |
| dirty unused pages. |
| - Make cumulative heap profiling data optional, so that it is possible to |
| limit the amount of memory consumed by heap profiling data structures. |
| - Add per thread allocation counters that can be accessed via the |
| "thread.allocated" and "thread.deallocated" mallctls. |
| |
| Incompatible changes: |
| - Remove JEMALLOC_OPTIONS and malloc_options (see MALLOC_CONF above). |
| - Increase default backtrace depth from 4 to 128 for heap profiling. |
| - Disable interval-based profile dumps by default. |
| |
| Bug fixes: |
| - Remove bad assertions in fork handler functions. These assertions could |
| cause aborts for some combinations of configure settings. |
| - Fix strerror_r() usage to deal with non-standard semantics in GNU libc. |
| - Fix leak context reporting. This bug tended to cause the number of contexts |
| to be underreported (though the reported number of objects and bytes were |
| correct). |
| - Fix a realloc() bug for large in-place growing reallocation. This bug could |
| cause memory corruption, but it was hard to trigger. |
| - Fix an allocation bug for small allocations that could be triggered if |
| multiple threads raced to create a new run of backing pages. |
| - Enhance the heap profiler to trigger samples based on usable size, rather |
| than request size. |
| - Fix a heap profiling bug due to sometimes losing track of requested object |
| size for sampled objects. |
| |
| * 1.0.3 (August 12, 2010) |
| |
| Bug fixes: |
| - Fix the libunwind-based implementation of stack backtracing (used for heap |
| profiling). This bug could cause zero-length backtraces to be reported. |
| - Add a missing mutex unlock in library initialization code. If multiple |
| threads raced to initialize malloc, some of them could end up permanently |
| blocked. |
| |
| * 1.0.2 (May 11, 2010) |
| |
| Bug fixes: |
| - Fix junk filling of large objects, which could cause memory corruption. |
| - Add MAP_NORESERVE support for chunk mapping, because otherwise virtual |
| memory limits could cause swap file configuration to fail. Contributed by |
| Jordan DeLong. |
| |
| * 1.0.1 (April 14, 2010) |
| |
| Bug fixes: |
| - Fix compilation when --enable-fill is specified. |
| - Fix threads-related profiling bugs that affected accuracy and caused memory |
| to be leaked during thread exit. |
| - Fix dirty page purging race conditions that could cause crashes. |
| - Fix crash in tcache flushing code during thread destruction. |
| |
| * 1.0.0 (April 11, 2010) |
| |
| This release focuses on speed and run-time introspection. Numerous |
| algorithmic improvements make this release substantially faster than its |
| predecessors. |
| |
| New features: |
| - Implement autoconf-based configuration system. |
| - Add mallctl*(), for the purposes of introspection and run-time |
| configuration. |
| - Make it possible for the application to manually flush a thread's cache, via |
| the "tcache.flush" mallctl. |
| - Base maximum dirty page count on proportion of active memory. |
| - Compute various additional run-time statistics, including per size class |
| statistics for large objects. |
| - Expose malloc_stats_print(), which can be called repeatedly by the |
| application. |
| - Simplify the malloc_message() signature to only take one string argument, |
| and incorporate an opaque data pointer argument for use by the application |
| in combination with malloc_stats_print(). |
| - Add support for allocation backed by one or more swap files, and allow the |
| application to disable over-commit if swap files are in use. |
| - Implement allocation profiling and leak checking. |
| |
| Removed features: |
| - Remove the dynamic arena rebalancing code, since thread-specific caching |
| reduces its utility. |
| |
| Bug fixes: |
| - Modify chunk allocation to work when address space layout randomization |
| (ASLR) is in use. |
| - Fix thread cleanup bugs related to TLS destruction. |
| - Handle 0-size allocation requests in posix_memalign(). |
| - Fix a chunk leak. The leaked chunks were never touched, so this impacted |
| virtual memory usage, but not physical memory usage. |
| |
| * linux_2008082[78]a (August 27/28, 2008) |
| |
| These snapshot releases are the simple result of incorporating Linux-specific |
| support into the FreeBSD malloc sources. |
| |
| -------------------------------------------------------------------------------- |
| vim:filetype=text:textwidth=80 |