6a7,76
> * 4.0.2 (September 21, 2015)
>
> This bugfix release addresses a few bugs specific to heap profiling.
>
> Bug fixes:
> - Fix ixallocx_prof_sample() to never modify nor create sampled small
> allocations. xallocx() is in general incapable of moving small allocations,
> so this fix removes buggy code without loss of generality.
> - Fix irallocx_prof_sample() to always allocate large regions, even when
> alignment is non-zero.
> - Fix prof_alloc_rollback() to read tdata from thread-specific data rather
> than dereferencing a potentially invalid tctx.
>
> * 4.0.1 (September 15, 2015)
>
> This is a bugfix release that is somewhat high risk due to the amount of
> refactoring required to address deep xallocx() problems. As a side effect of
> these fixes, xallocx() now tries harder to partially fulfill requests for
> optional extra space. Note that a couple of minor heap profiling
> optimizations are included, but these are better thought of as performance
> fixes that were integral to disovering most of the other bugs.
>
> Optimizations:
> - Avoid a chunk metadata read in arena_prof_tctx_set(), since it is in the
> fast path when heap profiling is enabled. Additionally, split a special
> case out into arena_prof_tctx_reset(), which also avoids chunk metadata
> reads.
> - Optimize irallocx_prof() to optimistically update the sampler state. The
> prior implementation appears to have been a holdover from when
> rallocx()/xallocx() functionality was combined as rallocm().
>
> Bug fixes:
> - Fix TLS configuration such that it is enabled by default for platforms on
> which it works correctly.
> - 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.
> - Fix xallocx() bugs related to size+extra exceeding HUGE_MAXCLASS.
> - Fix chunk purge hook calls for in-place huge shrinking reallocation to
> specify the old chunk size rather than the new chunk size. This bug caused
> no correctness issues for the default chunk purge function, but was
> visible to custom functions set via the "arena.<i>.chunk_hooks" mallctl.
> - Fix heap profiling bugs:
> + Fix heap profiling to distinguish among otherwise identical sample sites
> with interposed resets (triggered via the "prof.reset" mallctl). This bug
> could cause data structure corruption that would most likely result in a
> segfault.
> + Fix irealloc_prof() to prof_alloc_rollback() on OOM.
> + Make one call to prof_active_get_unlocked() per allocation event, and use
> the result throughout the relevant functions that handle an allocation
> event. Also add a missing check in prof_realloc(). These fixes protect
> allocation events against concurrent prof_active changes.
> + Fix ixallocx_prof() to pass usize_max and zero to ixallocx_prof_sample()
> in the correct order.
> + Fix prof_realloc() to call prof_free_sampled_object() after calling
> prof_malloc_sample_object(). Prior to this fix, if tctx and old_tctx were
> the same, the tctx could have been prematurely destroyed.
> - Fix portability bugs:
> + 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.
> + Don't assume that /bin/sh is appropriate when running size_classes.sh
> during configuration.
> + Consider __sparcv9 a synonym for __sparc64__ when defining LG_QUANTUM.
> + Link tests to librt if it contains clock_gettime(2).
>
> * 4.0.2 (September 21, 2015)
>
> This bugfix release addresses a few bugs specific to heap profiling.
>
> Bug fixes:
> - Fix ixallocx_prof_sample() to never modify nor create sampled small
> allocations. xallocx() is in general incapable of moving small allocations,
> so this fix removes buggy code without loss of generality.
> - Fix irallocx_prof_sample() to always allocate large regions, even when
> alignment is non-zero.
> - Fix prof_alloc_rollback() to read tdata from thread-specific data rather
> than dereferencing a potentially invalid tctx.
>
> * 4.0.1 (September 15, 2015)
>
> This is a bugfix release that is somewhat high risk due to the amount of
> refactoring required to address deep xallocx() problems. As a side effect of
> these fixes, xallocx() now tries harder to partially fulfill requests for
> optional extra space. Note that a couple of minor heap profiling
> optimizations are included, but these are better thought of as performance
> fixes that were integral to disovering most of the other bugs.
>
> Optimizations:
> - Avoid a chunk metadata read in arena_prof_tctx_set(), since it is in the
> fast path when heap profiling is enabled. Additionally, split a special
> case out into arena_prof_tctx_reset(), which also avoids chunk metadata
> reads.
> - Optimize irallocx_prof() to optimistically update the sampler state. The
> prior implementation appears to have been a holdover from when
> rallocx()/xallocx() functionality was combined as rallocm().
>
> Bug fixes:
> - Fix TLS configuration such that it is enabled by default for platforms on
> which it works correctly.
> - 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.
> - Fix xallocx() bugs related to size+extra exceeding HUGE_MAXCLASS.
> - Fix chunk purge hook calls for in-place huge shrinking reallocation to
> specify the old chunk size rather than the new chunk size. This bug caused
> no correctness issues for the default chunk purge function, but was
> visible to custom functions set via the "arena.<i>.chunk_hooks" mallctl.
> - Fix heap profiling bugs:
> + Fix heap profiling to distinguish among otherwise identical sample sites
> with interposed resets (triggered via the "prof.reset" mallctl). This bug
> could cause data structure corruption that would most likely result in a
> segfault.
> + Fix irealloc_prof() to prof_alloc_rollback() on OOM.
> + Make one call to prof_active_get_unlocked() per allocation event, and use
> the result throughout the relevant functions that handle an allocation
> event. Also add a missing check in prof_realloc(). These fixes protect
> allocation events against concurrent prof_active changes.
> + Fix ixallocx_prof() to pass usize_max and zero to ixallocx_prof_sample()
> in the correct order.
> + Fix prof_realloc() to call prof_free_sampled_object() after calling
> prof_malloc_sample_object(). Prior to this fix, if tctx and old_tctx were
> the same, the tctx could have been prematurely destroyed.
> - Fix portability bugs:
> + 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.
> + Don't assume that /bin/sh is appropriate when running size_classes.sh
> during configuration.
> + Consider __sparcv9 a synonym for __sparc64__ when defining LG_QUANTUM.
> + Link tests to librt if it contains clock_gettime(2).
>