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Restructure the ctx initialization code such that the ctx isn't locked
across portions of the initialization code where allocation could occur.
Instead artificially inflate the cnt_merged.curobjs field, just as is
done elsewhere to avoid similar races to the one that would otherwise be
created by the reduction in locking scope.
This bug affected interval- and growth-triggered heap dumping, but not
manual heap dumping.
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Fix a race condition in ctx destruction that could cause undefined
behavior (deadlock observed).
Add mutex unlocks to some OOM error paths.
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Replace the single-character run-time flags with key/value pairs, which
can be set via the malloc_conf global, /etc/malloc.conf, and the
MALLOC_CONF environment variable.
Replace the JEMALLOC_PROF_PREFIX environment variable with the
"opt.prof_prefix" option.
Replace umax2s() with u2s().
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Fix a regression due to the recent heap profiling accuracy improvements:
prof_{m,re}alloc() must set the object's profiling context regardless of
whether it is sampled.
Fix management of the CHUNK_MAP_CLASS chunk map bits, such that all
large object (re-)allocation paths correctly initialize the bits. Prior
to this fix, in-place realloc() cleared the bits, resulting in incorrect
reported object size from arena_salloc_demote(). After this fix the
non-demoted bit pattern is all zeros (instead of all ones), which makes
it easier to assure that the bits are properly set.
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Inline the heap sampling code that is executed for every allocation
event (regardless of whether a sample is taken).
Combine all prof TLS data into a single data structure, in order to
reduce the TLS lookup volume.
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Add the "thread.allocated" and "thread.deallocated" mallctls, which can
be used to query the total number of bytes ever allocated/deallocated by
the calling thread.
Add s2u() and sa2u(), which can be used to compute the usable size that
will result from an allocation request of a particular size/alignment.
Re-factor ipalloc() to use sa2u().
Enhance the heap profiler to trigger samples based on usable size,
rather than request size. This has a subtle, but important, impact on
the accuracy of heap sampling. For example, previous to this change,
16- and 17-byte objects were sampled at nearly the same rate, but
17-byte objects actually consume 32 bytes each. Therefore it was
possible for the sample to be somewhat skewed compared to actual memory
usage of the allocated objects.
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Increase PRN 'a' and 'c' constants, so that high bits tend to cascade
more.
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Fix a bug in leak context count reporting that tended to cause the
number of contexts to be underreported. The reported number of leaked
objects and bytes were not affected by this bug.
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Increase the default backtrace depth, because shallow backtraces tend to
result in confusing pprof output graphs.
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Add the R option to control whether cumulative heap profile data
are maintained. Add the T option to control the size of per thread
backtrace caches, primarily because when the R option is specified,
backtraces that no longer have allocations associated with them are
discarded as soon as no thread caches refer to them.
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Use INT_MAX instead of MAX_INT in ALLOCM_ALIGN(), and #include
<limits.h> in order to get its definition.
Modify prof code related to hash tables to avoid aliasing warnings from
gcc 4.1.2 (gcc 4.4.0 and 4.4.3 do not warn).
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Add --enable-cc-silence, which can be used to silence harmless warnings.
Fix an aliasing bug in ckh_pointer_hash().
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Add allocm(), rallocm(), sallocm(), and dallocm(), which are a
functional superset of malloc(), calloc(), posix_memalign(),
malloc_usable_size(), and free().
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Add Mac OS X support, based in large part on the OS X support in
Mozilla's version of jemalloc.
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Fix the libunwind version of prof_backtrace() to set the backtrace depth
for all possible code paths. This fixes the zero-length backtrace
problem when using libunwind.
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When heap profiling is enabled but deactivated, there is no need to call
isalloc(ptr) in prof_{malloc,realloc}(). Avoid these calls, so that
profiling overhead under such conditions is negligible.
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Properly set the context associated with each allocated object, even
when the object is not sampled.
Remove debug print code that slipped in.
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Initialize bt2cnt_tsd so that cleanup at thread exit actually happens.
Associate (prof_ctx_t *) with allocated objects, rather than
(prof_thr_cnt_t *). Each thread must always operate on its own
(prof_thr_cnt_t *), and an object may outlive the thread that allocated it.
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Remove a duplicate prof_leave() call in an error path through
prof_dump().
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Leak reporting is useful even if sampling is enabled; some leaks may not
be reported, but those reported are still genuine leaks.
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Add the E/e options to control whether the application starts with
sampling active/inactive (secondary control to F/f). Add the
prof.active mallctl so that the application can activate/deactivate
sampling on the fly.
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Make it possible to disable interval-triggered profile dumping, even if
profiling is enabled. This is useful if the user only wants a single
dump at exit, or if the application manually triggers profile dumps.
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If the mean heap sampling interval is larger than one page, simulate
sampled small objects with large objects. This allows profiling context
pointers to be omitted for small objects. As a result, the memory
overhead for sampling decreases as the sampling interval is increased.
Fix a compilation error in the profiling code.
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Rather than passing four strings to malloc_message(), malloc_write4(),
and all the functions that use them, only pass one string.
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Move prof_sample_threshold initialization into prof_alloc_prep(),
before using it to decide whether to capture a backtrace.
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Add mallctl interfaces for profiling parameters.
Fix a file descriptor leak in heap profile dumping.
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If JEMALLOC_PROF_PREFIX is set in the environment, use it as the
filename prefix when dumping heap profiles, rather than "jeprof".
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Bootstrap profiling in three stages, so that it is usable by the time
the first application allocation occurs.
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Add the --disable-prof-libgcc configure option, and add backtracing
based on libgcc, which is used by default.
Fix a bug in hash().
Fix various configuration-dependent compilation errors.
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Add the --enable-prof and --enable-prof-libunwind configure options.
Add the B/b, F/f, I/i, L/l, and U/u JEMALLOC_OPTIONS.
Interval-based profile dump triggering is not yet implemented.
Add supporting generic code:
* Add memory barriers.
* Add prn (LCG PRNG).
* Add hash (Murmur hash function).
* Add ckh (cuckoo hash tables).
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