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.
Remove malloc_swap_enable(), which was obsoleted by the "swap.fds"
mallctl. The prototype for malloc_swap_enable() was removed from
jemalloc/jemalloc.h, but the function itself was accidentally left in
place.
Base dynamic structure size on offsetof(), rather than subtracting the
size of the dynamic structure member. Results could differ on systems
with strict data structure alignment requirements.
Invert the chunk map bit that tracks whether a page is zeroed, so that
for zeroed arena chunks, the interior of the page map does not need to
be initialized (as it consists entirely of zero bytes).
It is common to have to specify something like JEMALLOC_OPTIONS=F31i,
because interval-based dumps are often unuseful or too expensive.
Therefore, disable interval-based dumps by default. To get the previous
default behavior it is now necessary to specify 31I as part of the
options.
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).
Remove assertions that malloc_{pre,post}fork() are only called if
threading is enabled. This was true of these functions in the context
of FreeBSD's libc, but now the functions are called unconditionally as a
result of registering them with pthread_atfork().
Add allocm(), rallocm(), sallocm(), and dallocm(), which are a
functional superset of malloc(), calloc(), posix_memalign(),
malloc_usable_size(), and free().
Move the table of size classes from jemalloc.c to the manual page. When
manually formatting the manual page, it is now necessary to use:
nroff -man -t jemalloc.3
If multiple threads race to initialize malloc, the loser(s) busy-wait
until initialization is complete. Add a missing mutex lock so that the
loser(s) properly release the initialization mutex. Under some
race conditions, this flaw could have caused one or more threads to
become permanently blocked.
Reported by Terrell Magee.
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.
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.
If there is more than one arena, initialize next_arena so that the
first and second threads to allocate memory use arenas 0 and 1, rather
than both using arena 0.
Use the size argument to tcache_dalloc_large() to control the number of
bytes set to 0x5a when junk filling is enabled, rather than accessing a
non-existent arena bin. This bug was capable of corrupting an
arbitrarily large memory region, depending on what followed the arena
data structure in memory (typically zeroed memory, another arena_t, or a
red-black tree node for a huge object).
Properly maintain tcache_bin_t's avail pointer such that it is NULL if
no objects are cached. This only caused problems during thread cache
destruction, since cache flushing otherwise never occurs on an empty
bin.
Fix arena_chunk_dealloc() to put the new spare in a consistent state before
dropping the arena mutex to deallocate the previous spare.
Fix arena_run_dalloc() to insert a newly dirtied chunk into the
chunks_dirty list before potentially deallocating the chunk, so that dirty
page accounting is self-consistent.
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.
Now that JEMALLOC_OPTIONS=P isn't the only way to cause stats_print() to
be called, opt_stats_print must actually be checked when reporting the
state of the P/p option.
Don't build with -march=native by default, because the generated code
may perform especially poorly on ABI-compatible, but internally
different, systems.
Fix divide-by-zero error in pprof. It is possible for sample contexts
to currently have no associated objects, but the cumulative statistics
are still useful, depending on how the user invokes pprof. Since
jemalloc intentionally does not filter such contexts, take care not to
divide by 0 when re-scaling for v2 heap sampling.
Install pprof as part of 'make install'.
Update pprof documentation.
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.
