This publish contains complete 160 commits, focusing on the specialized debts
cleaning including refactorings, bug fixes, test safety improvement, and
option cleanups. The publish additionally includes portability improvements per
upstream issues report.
New features:
- Add EXTENT_ALLOC_FLAG_PINNED so tradition extent-allocation hooks can
mark non-reclaimable mappings, specified as HugeTLB pages, for preferential
reuse exterior the decay and purge pipeline. Add the mallctl interfaces
stats.pinned, stats.arenas.<i>.pinned,
stats.arenas.<i>.extents.<j>.npinned,
stats.arenas.<i>.extents.<j>.pinned_bytes, and
stats.arenas.<i>.mutexes.extents_pinned.{counter} to report
pinned-memory use and mutex statistics. (@binliu19: be2de8c) - Allow resuming per-CPU arena choice via thread.arena.
(@Algunenano: 68c35f6) - Better align the contents of human-readable and JSON malloc statistics.
(@spredolac: 68fe1be, 30b1a41, 04aad97) - Replace the runtime experimental_infallible_new choice alongside the
compile-time --enable-cxx-infallible-new option, enabling
compiler-level optimizations and optimization in move constructors,
and fix the new(std::nothrow) agreement (@spredolac: 160ab9d, fe33667)
Incompatible changes:
- Adapt tcache inhabit and preservation targets per bin to petition observed
between GC events, replacing the fixed refill/flush policy. Remove
seven bequest non-experimental controls: lg_tcache_nslots_mul,
tcache_nslots_small_min, tcache_nslots_small_max,
tcache_nslots_large, tcache_gc_delay_bytes,
lg_tcache_flush_small_div, and lg_tcache_flush_large_div.
Corresponding malloc_conf settings are silently ignored, matching
opt.* mallctls come back ENOENT, and tcache_ncached_max remains
supported. (@spredolac: d13fe91)
Bug fixes:
- Preserve errno throughout free, free_sized, and free_aligned_sized,
and throughout process_madvise-based leaf purging. (@spredolac: 3a77966,
86f0582) - Fix numeric overflow checks in size classes. (@spredolac: 6b24522)
- Accept NULL in free_sized() and free_aligned_sized() (C23
correctness). (@bigbruno: 7ce8b91) - Fix TSD lifecycle border cases by 1) initializing thread-cache bins before
marking the cache enabled, preventing reentrant bootstrap allocations
from using uninitialized state, and 2) avoiding TSD recreation for late
deallocations following thread teardown on generic-TSD platforms.
(@fzakaria: 54f22c8, @spredolac: fb5499a) - Use O_CLOEXEC whenever beginning the THP sysfs document in init_thp_state.
(@ibookstein: d070554) - Fix copy opt.stats_print and opt.stats_print_opts sectors in
malloc_stats_print output. (@spredolac: dfe3a2e) - Fix a possible deadlock during arena_reset. (@guangli-dai: 6957341)
- Fix a prof-sampling / guard-page communication bug in the SAN. (@gctony:
e36a0fa)
Optimizations and refactors:
- Modularize jemalloc's forefront end by extracting arena management,
initialization, fork orchestration, and allocation dispatch from
jemalloc.c; untangle tcache/arena ownership; and consolidate the
internal header chart to eliminate circular dependencies. (@spredolac:
ba1e2fe, 8874597, 9d75722, de9ad14, ...) - Simplify ctl dispatch by refactoring arena helpers, internalizing an
implementation-only control, replacing control-flow macros alongside typed
helpers, and organizing ctl.c by subsystem. (@spredolac: 9e14346,
901365d, 4e903a0, 5bc8d6e) - Cap the base-block growth heuristic to evade virtual-memory exhaustion
under rare racy conditions. (@guangli-dai: 2f4db8c) - Move background-thread lifecycle and province operations into the
background-thread module, clarifying ownership independently of PAC/HPA
callers. (@guangli-dai: f1f0792) - Simplify the page-allocation border by replacing PAI vtable dispatch
with straightforward PAC/HPA calls, removing the obsolete pai_t/pai.h
abstraction, and moving deferred-work and decay orchestration out of the
arena. (@guangli-dai: 1dfa6f7, 8edd101, d410f43) - Refactor data gathering and rendering into separate
gather/emission stages and descriptor-driven tables. (@spredolac:
184f304, 80c8fcb) - Introduce an OS idea tier and move platform-dependent
file/process I/O, time, synchronization, CPU, virtual-memory, atfork,
error-handling, profiling, thread-yield, and configuration-access
operations out of allocator center code. (@guangli-dai: c4158ac,
c8e2e01, ...)
Portability improvements:
- Replace the std::__throw_bad_alloc call alongside norm C++ (#2900).
(@lexprfuncall: 1a15fe3) - Make arena_s use a elastic gathering associate (bin_t all_bins[]) for C99
or newer. (@grueninger: 300b58b) - Fix rdtscp finding alongside --with-lg-vaddr. (@xinydev: e8a0d2b)
- Fix malloc_getcpu on macOS to peruse the current CPU figure correctly.
(@Algunenano: 5aabbc8) - Use CLOCK_MONOTONIC for background-thread sleep to prevent
clock-rollback stalls, and detect monotonic-condvar assistance at configure
time. (@antonio2368: ebacec3, 8361239) - Fix compilation warnings on macOS. (@gctony: abb0a8a)
- Fix thread-exit TSD cleanup on MinGW builds. (@gctony: 1e92317)
- Fix GCC 16 build warnings by removing -Wpedantic violations in macro
and function syntax and explicitly NUL-terminating profiling thread-name
copies to determine -Wstringop-truncation. (@grueninger: 5acdcee,
c22d929, @jasonangelov: 6a245e0) - Parse PID-namespace symlinks without glibc-dependent strtok/atol,
and come back identifiers as uint64_t. (@guangli-dai: 278d90a)
