507 lines
22 KiB
Plaintext
507 lines
22 KiB
Plaintext
Following are change highlights associated with official releases. Important
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bug fixes are all mentioned, but internal enhancements are omitted here for
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brevity (even though they are more fun to write about). Much more detail can be
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found in the git revision history:
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http://www.canonware.com/cgi-bin/gitweb.cgi?p=jemalloc.git
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git://canonware.com/jemalloc.git
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* 3.5.0 (January 22, 2014)
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This version focuses on refactoring and automated testing, though it also
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includes some non-trivial heap profiling optimizations not mentioned below.
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New features:
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- Add the *allocx() API, which is a successor to the experimental *allocm()
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API. The *allocx() functions are slightly simpler to use because they have
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fewer parameters, they directly return the results of primary interest, and
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mallocx()/rallocx() avoid the strict aliasing pitfall that
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allocm()/rallocx() share with posix_memalign(). Note that *allocm() is
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slated for removal in the next non-bugfix release.
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- Add support for LinuxThreads.
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Bug fixes:
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- Unless heap profiling is enabled, disable floating point code and don't link
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with libm. This, in combination with e.g. EXTRA_CFLAGS=-mno-sse on x64
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systems, makes it possible to completely disable floating point register
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use. Some versions of glibc neglect to save/restore caller-saved floating
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point registers during dynamic lazy symbol loading, and the symbol loading
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code uses whatever malloc the application happens to have linked/loaded
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with, the result being potential floating point register corruption.
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- Report ENOMEM rather than EINVAL if an OOM occurs during heap profiling
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backtrace creation in imemalign(). This bug impacted posix_memalign() and
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aligned_alloc().
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- Fix a file descriptor leak in a prof_dump_maps() error path.
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- Fix prof_dump() to close the dump file descriptor for all relevant error
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paths.
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- Fix rallocm() to use the arena specified by the ALLOCM_ARENA(s) flag for
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allocation, not just deallocation.
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- Fix a data race for large allocation stats counters.
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- Fix a potential infinite loop during thread exit. This bug occurred on
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Solaris, and could affect other platforms with similar pthreads TSD
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implementations.
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- Don't junk-fill reallocations unless usable size changes. This fixes a
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violation of the *allocx()/*allocm() semantics.
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- Fix growing large reallocation to junk fill new space.
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- Fix huge deallocation to junk fill when munmap is disabled.
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- Change the default private namespace prefix from empty to je_, and change
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--with-private-namespace-prefix so that it prepends an additional prefix
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rather than replacing je_. This reduces the likelihood of applications
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which statically link jemalloc experiencing symbol name collisions.
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- Add missing private namespace mangling (relevant when
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--with-private-namespace is specified).
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- Add and use JEMALLOC_INLINE_C so that static inline functions are marked as
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static even for debug builds.
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- Add a missing mutex unlock in a malloc_init_hard() error path. In practice
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this error path is never executed.
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- Fix numerous bugs in malloc_strotumax() error handling/reporting. These
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bugs had no impact except for malformed inputs.
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- Fix numerous bugs in malloc_snprintf(). These bugs were not exercised by
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existing calls, so they had no impact.
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* 3.4.1 (October 20, 2013)
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Bug fixes:
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- Fix a race in the "arenas.extend" mallctl that could cause memory corruption
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of internal data structures and subsequent crashes.
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- Fix Valgrind integration flaws that caused Valgrind warnings about reads of
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uninitialized memory in:
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+ arena chunk headers
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+ internal zero-initialized data structures (relevant to tcache and prof
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code)
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- Preserve errno during the first allocation. A readlink(2) call during
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initialization fails unless /etc/malloc.conf exists, so errno was typically
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set during the first allocation prior to this fix.
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- Fix compilation warnings reported by gcc 4.8.1.
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* 3.4.0 (June 2, 2013)
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This version is essentially a small bugfix release, but the addition of
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aarch64 support requires that the minor version be incremented.
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Bug fixes:
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- Fix race-triggered deadlocks in chunk_record(). These deadlocks were
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typically triggered by multiple threads concurrently deallocating huge
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objects.
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New features:
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- Add support for the aarch64 architecture.
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* 3.3.1 (March 6, 2013)
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This version fixes bugs that are typically encountered only when utilizing
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custom run-time options.
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Bug fixes:
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- Fix a locking order bug that could cause deadlock during fork if heap
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profiling were enabled.
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- Fix a chunk recycling bug that could cause the allocator to lose track of
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whether a chunk was zeroed. On FreeBSD, NetBSD, and OS X, it could cause
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corruption if allocating via sbrk(2) (unlikely unless running with the
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"dss:primary" option specified). This was completely harmless on Linux
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unless using mlockall(2) (and unlikely even then, unless the
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--disable-munmap configure option or the "dss:primary" option was
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specified). This regression was introduced in 3.1.0 by the
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mlockall(2)/madvise(2) interaction fix.
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- Fix TLS-related memory corruption that could occur during thread exit if the
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thread never allocated memory. Only the quarantine and prof facilities were
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susceptible.
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- Fix two quarantine bugs:
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+ Internal reallocation of the quarantined object array leaked the old
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array.
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+ Reallocation failure for internal reallocation of the quarantined object
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array (very unlikely) resulted in memory corruption.
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- Fix Valgrind integration to annotate all internally allocated memory in a
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way that keeps Valgrind happy about internal data structure access.
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- Fix building for s390 systems.
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* 3.3.0 (January 23, 2013)
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This version includes a few minor performance improvements in addition to the
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listed new features and bug fixes.
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New features:
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- Add clipping support to lg_chunk option processing.
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- Add the --enable-ivsalloc option.
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- Add the --without-export option.
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- Add the --disable-zone-allocator option.
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Bug fixes:
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- Fix "arenas.extend" mallctl to output the number of arenas.
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- Fix chunk_recycle() to unconditionally inform Valgrind that returned memory
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is undefined.
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- Fix build break on FreeBSD related to alloca.h.
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* 3.2.0 (November 9, 2012)
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In addition to a couple of bug fixes, this version modifies page run
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allocation and dirty page purging algorithms in order to better control
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page-level virtual memory fragmentation.
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Incompatible changes:
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- Change the "opt.lg_dirty_mult" default from 5 to 3 (32:1 to 8:1).
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Bug fixes:
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- Fix dss/mmap allocation precedence code to use recyclable mmap memory only
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after primary dss allocation fails.
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- Fix deadlock in the "arenas.purge" mallctl. This regression was introduced
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in 3.1.0 by the addition of the "arena.<i>.purge" mallctl.
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* 3.1.0 (October 16, 2012)
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New features:
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- Auto-detect whether running inside Valgrind, thus removing the need to
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manually specify MALLOC_CONF=valgrind:true.
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- Add the "arenas.extend" mallctl, which allows applications to create
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manually managed arenas.
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- Add the ALLOCM_ARENA() flag for {,r,d}allocm().
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- Add the "opt.dss", "arena.<i>.dss", and "stats.arenas.<i>.dss" mallctls,
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which provide control over dss/mmap precedence.
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- Add the "arena.<i>.purge" mallctl, which obsoletes "arenas.purge".
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- Define LG_QUANTUM for hppa.
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Incompatible changes:
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- Disable tcache by default if running inside Valgrind, in order to avoid
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making unallocated objects appear reachable to Valgrind.
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- Drop const from malloc_usable_size() argument on Linux.
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Bug fixes:
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- Fix heap profiling crash if sampled object is freed via realloc(p, 0).
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- Remove const from __*_hook variable declarations, so that glibc can modify
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them during process forking.
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- Fix mlockall(2)/madvise(2) interaction.
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- Fix fork(2)-related deadlocks.
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- Fix error return value for "thread.tcache.enabled" mallctl.
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* 3.0.0 (May 11, 2012)
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Although this version adds some major new features, the primary focus is on
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internal code cleanup that facilitates maintainability and portability, most
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of which is not reflected in the ChangeLog. This is the first release to
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incorporate substantial contributions from numerous other developers, and the
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result is a more broadly useful allocator (see the git revision history for
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contribution details). Note that the license has been unified, thanks to
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Facebook granting a license under the same terms as the other copyright
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holders (see COPYING).
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New features:
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- Implement Valgrind support, redzones, and quarantine.
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- Add support for additional platforms:
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+ FreeBSD
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+ Mac OS X Lion
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+ MinGW
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+ Windows (no support yet for replacing the system malloc)
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- Add support for additional architectures:
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+ MIPS
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+ SH4
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+ Tilera
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- Add support for cross compiling.
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- Add nallocm(), which rounds a request size up to the nearest size class
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without actually allocating.
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- Implement aligned_alloc() (blame C11).
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- Add the "thread.tcache.enabled" mallctl.
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- Add the "opt.prof_final" mallctl.
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- Update pprof (from gperftools 2.0).
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- Add the --with-mangling option.
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- Add the --disable-experimental option.
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- Add the --disable-munmap option, and make it the default on Linux.
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- Add the --enable-mremap option, which disables use of mremap(2) by default.
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Incompatible changes:
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- Enable stats by default.
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- Enable fill by default.
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- Disable lazy locking by default.
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- Rename the "tcache.flush" mallctl to "thread.tcache.flush".
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- Rename the "arenas.pagesize" mallctl to "arenas.page".
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- Change the "opt.lg_prof_sample" default from 0 to 19 (1 B to 512 KiB).
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- Change the "opt.prof_accum" default from true to false.
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Removed features:
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- Remove the swap feature, including the "config.swap", "swap.avail",
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"swap.prezeroed", "swap.nfds", and "swap.fds" mallctls.
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- Remove highruns statistics, including the
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"stats.arenas.<i>.bins.<j>.highruns" and
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"stats.arenas.<i>.lruns.<j>.highruns" mallctls.
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- As part of small size class refactoring, remove the "opt.lg_[qc]space_max",
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"arenas.cacheline", "arenas.subpage", "arenas.[tqcs]space_{min,max}", and
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"arenas.[tqcs]bins" mallctls.
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- Remove the "arenas.chunksize" mallctl.
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- Remove the "opt.lg_prof_tcmax" option.
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- Remove the "opt.lg_prof_bt_max" option.
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- Remove the "opt.lg_tcache_gc_sweep" option.
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- Remove the --disable-tiny option, including the "config.tiny" mallctl.
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- Remove the --enable-dynamic-page-shift configure option.
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- Remove the --enable-sysv configure option.
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Bug fixes:
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- Fix a statistics-related bug in the "thread.arena" mallctl that could cause
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invalid statistics and crashes.
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- Work around TLS deallocation via free() on Linux. This bug could cause
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write-after-free memory corruption.
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- Fix a potential deadlock that could occur during interval- and
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growth-triggered heap profile dumps.
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- Fix large calloc() zeroing bugs due to dropping chunk map unzeroed flags.
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- Fix chunk_alloc_dss() to stop claiming memory is zeroed. This bug could
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cause memory corruption and crashes with --enable-dss specified.
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- Fix fork-related bugs that could cause deadlock in children between fork
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and exec.
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- Fix malloc_stats_print() to honor 'b' and 'l' in the opts parameter.
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- Fix realloc(p, 0) to act like free(p).
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- Do not enforce minimum alignment in memalign().
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- Check for NULL pointer in malloc_usable_size().
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- Fix an off-by-one heap profile statistics bug that could be observed in
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interval- and growth-triggered heap profiles.
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- Fix the "epoch" mallctl to update cached stats even if the passed in epoch
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is 0.
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- Fix bin->runcur management to fix a layout policy bug. This bug did not
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affect correctness.
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- Fix a bug in choose_arena_hard() that potentially caused more arenas to be
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initialized than necessary.
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- Add missing "opt.lg_tcache_max" mallctl implementation.
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- Use glibc allocator hooks to make mixed allocator usage less likely.
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- Fix build issues for --disable-tcache.
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- Don't mangle pthread_create() when --with-private-namespace is specified.
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* 2.2.5 (November 14, 2011)
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Bug fixes:
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- Fix huge_ralloc() race when using mremap(2). This is a serious bug that
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could cause memory corruption and/or crashes.
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- Fix huge_ralloc() to maintain chunk statistics.
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- Fix malloc_stats_print(..., "a") output.
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* 2.2.4 (November 5, 2011)
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Bug fixes:
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- Initialize arenas_tsd before using it. This bug existed for 2.2.[0-3], as
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well as for --disable-tls builds in earlier releases.
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- Do not assume a 4 KiB page size in test/rallocm.c.
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* 2.2.3 (August 31, 2011)
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This version fixes numerous bugs related to heap profiling.
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Bug fixes:
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- Fix a prof-related race condition. This bug could cause memory corruption,
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but only occurred in non-default configurations (prof_accum:false).
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- Fix off-by-one backtracing issues (make sure that prof_alloc_prep() is
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excluded from backtraces).
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- Fix a prof-related bug in realloc() (only triggered by OOM errors).
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- Fix prof-related bugs in allocm() and rallocm().
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- Fix prof_tdata_cleanup() for --disable-tls builds.
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- Fix a relative include path, to fix objdir builds.
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* 2.2.2 (July 30, 2011)
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Bug fixes:
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- Fix a build error for --disable-tcache.
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- Fix assertions in arena_purge() (for real this time).
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- Add the --with-private-namespace option. This is a workaround for symbol
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conflicts that can inadvertently arise when using static libraries.
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* 2.2.1 (March 30, 2011)
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Bug fixes:
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- Implement atomic operations for x86/x64. This fixes compilation failures
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for versions of gcc that are still in wide use.
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- Fix an assertion in arena_purge().
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* 2.2.0 (March 22, 2011)
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This version incorporates several improvements to algorithms and data
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structures that tend to reduce fragmentation and increase speed.
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New features:
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- Add the "stats.cactive" mallctl.
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- Update pprof (from google-perftools 1.7).
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- Improve backtracing-related configuration logic, and add the
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--disable-prof-libgcc option.
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Bug fixes:
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- Change default symbol visibility from "internal", to "hidden", which
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decreases the overhead of library-internal function calls.
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- Fix symbol visibility so that it is also set on OS X.
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- Fix a build dependency regression caused by the introduction of the .pic.o
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suffix for PIC object files.
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- Add missing checks for mutex initialization failures.
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- Don't use libgcc-based backtracing except on x64, where it is known to work.
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- Fix deadlocks on OS X that were due to memory allocation in
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pthread_mutex_lock().
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- Heap profiling-specific fixes:
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+ Fix memory corruption due to integer overflow in small region index
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computation, when using a small enough sample interval that profiling
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context pointers are stored in small run headers.
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+ Fix a bootstrap ordering bug that only occurred with TLS disabled.
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+ Fix a rallocm() rsize bug.
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+ Fix error detection bugs for aligned memory allocation.
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* 2.1.3 (March 14, 2011)
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Bug fixes:
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- Fix a cpp logic regression (due to the "thread.{de,}allocatedp" mallctl fix
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for OS X in 2.1.2).
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- Fix a "thread.arena" mallctl bug.
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- Fix a thread cache stats merging bug.
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* 2.1.2 (March 2, 2011)
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Bug fixes:
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- Fix "thread.{de,}allocatedp" mallctl for OS X.
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- Add missing jemalloc.a to build system.
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* 2.1.1 (January 31, 2011)
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Bug fixes:
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- Fix aligned huge reallocation (affected allocm()).
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- Fix the ALLOCM_LG_ALIGN macro definition.
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- Fix a heap dumping deadlock.
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- Fix a "thread.arena" mallctl bug.
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* 2.1.0 (December 3, 2010)
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This version incorporates some optimizations that can't quite be considered
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bug fixes.
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New features:
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- Use Linux's mremap(2) for huge object reallocation when possible.
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- Avoid locking in mallctl*() when possible.
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- Add the "thread.[de]allocatedp" mallctl's.
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- Convert the manual page source from roff to DocBook, and generate both roff
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and HTML manuals.
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Bug fixes:
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- Fix a crash due to incorrect bootstrap ordering. This only impacted
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--enable-debug --enable-dss configurations.
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- Fix a minor statistics bug for mallctl("swap.avail", ...).
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* 2.0.1 (October 29, 2010)
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Bug fixes:
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- Fix a race condition in heap profiling that could cause undefined behavior
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if "opt.prof_accum" were disabled.
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- Add missing mutex unlocks for some OOM error paths in the heap profiling
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code.
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- Fix a compilation error for non-C99 builds.
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* 2.0.0 (October 24, 2010)
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This version focuses on the experimental *allocm() API, and on improved
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run-time configuration/introspection. Nonetheless, numerous performance
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improvements are also included.
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New features:
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- Implement the experimental {,r,s,d}allocm() API, which provides a superset
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of the functionality available via malloc(), calloc(), posix_memalign(),
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realloc(), malloc_usable_size(), and free(). These functions can be used to
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allocate/reallocate aligned zeroed memory, ask for optional extra memory
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during reallocation, prevent object movement during reallocation, etc.
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- Replace JEMALLOC_OPTIONS/JEMALLOC_PROF_PREFIX with MALLOC_CONF, which is
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more human-readable, and more flexible. For example:
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JEMALLOC_OPTIONS=AJP
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is now:
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MALLOC_CONF=abort:true,fill:true,stats_print:true
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- Port to Apple OS X. Sponsored by Mozilla.
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- Make it possible for the application to control thread-->arena mappings via
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the "thread.arena" mallctl.
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- Add compile-time support for all TLS-related functionality via pthreads TSD.
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This is mainly of interest for OS X, which does not support TLS, but has a
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TSD implementation with similar performance.
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- Override memalign() and valloc() if they are provided by the system.
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- Add the "arenas.purge" mallctl, which can be used to synchronously purge all
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dirty unused pages.
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- Make cumulative heap profiling data optional, so that it is possible to
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limit the amount of memory consumed by heap profiling data structures.
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- Add per thread allocation counters that can be accessed via the
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"thread.allocated" and "thread.deallocated" mallctls.
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Incompatible changes:
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- Remove JEMALLOC_OPTIONS and malloc_options (see MALLOC_CONF above).
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- Increase default backtrace depth from 4 to 128 for heap profiling.
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- Disable interval-based profile dumps by default.
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Bug fixes:
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- Remove bad assertions in fork handler functions. These assertions could
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cause aborts for some combinations of configure settings.
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- Fix strerror_r() usage to deal with non-standard semantics in GNU libc.
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- Fix leak context reporting. This bug tended to cause the number of contexts
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to be underreported (though the reported number of objects and bytes were
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correct).
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- Fix a realloc() bug for large in-place growing reallocation. This bug could
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cause memory corruption, but it was hard to trigger.
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- Fix an allocation bug for small allocations that could be triggered if
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multiple threads raced to create a new run of backing pages.
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- Enhance the heap profiler to trigger samples based on usable size, rather
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than request size.
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- Fix a heap profiling bug due to sometimes losing track of requested object
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size for sampled objects.
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* 1.0.3 (August 12, 2010)
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Bug fixes:
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- Fix the libunwind-based implementation of stack backtracing (used for heap
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profiling). This bug could cause zero-length backtraces to be reported.
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- Add a missing mutex unlock in library initialization code. If multiple
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threads raced to initialize malloc, some of them could end up permanently
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blocked.
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* 1.0.2 (May 11, 2010)
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Bug fixes:
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- 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 addtional 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
|