323 lines
13 KiB
Plaintext
323 lines
13 KiB
Plaintext
|
Following are change highlights associated with official releases. Important
|
||
|
|
bug fixes are all mentioned, but internal enhancements are omitted here for
|
||
|
|
brevity (even though they are more fun to write about). Much more detail can be
|
||
|
|
found in the git revision history:
|
||
|
|
|
||
|
|
http://www.canonware.com/cgi-bin/gitweb.cgi?p=jemalloc.git
|
||
|
|
git://canonware.com/jemalloc.git
|
||
|
|
|
||
|
|
* 3.0.0 (XXX not yet released)
|
||
|
|
|
||
|
|
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 operating systems:
|
||
|
|
+ FreeBSD
|
||
|
|
+ Mac OS X Lion
|
||
|
|
- 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 --disable-munmap option, and make it the default on Linux.
|
||
|
|
- Add the --with-mangling option.
|
||
|
|
- Add the --disable-experimental option.
|
||
|
|
- Add the "thread.tcache.enabled" mallctl.
|
||
|
|
|
||
|
|
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".
|
||
|
|
|
||
|
|
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 fork-related bugs that could cause deadlock in children between fork
|
||
|
|
and exec.
|
||
|
|
- Fix a statistics-related bug in the "thread.arena" mallctl that could cause
|
||
|
|
invalid statistics and crashes.
|
||
|
|
- Work around TLS dallocation via free() on Linux. This bug could cause
|
||
|
|
write-after-free memory corruption.
|
||
|
|
- 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 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.
|
||
|
|
|
||
|
|
* 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 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
|