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7029edec97
With profiling active, xallocx may decline to grow an allocation that is not page-aligned. The profiling path can require sampled xallocx growth to use page-aligned pointers; otherwise it can return the old usable size without committing the purged tail. Observed on Darwin, where decommit/commit are real VM state changes. The shrink/purge half succeeds and records a decommit, then the profiling-limited grow skips the matching commit. This is not Darwin-specific. Linux no-overcommit should expose the same mismatch. Usual Linux overcommit behavior papers it over by making commit/decommit hooks report unsupported, so both sides of the old equality check stay false. Relax the default-path assertion only while profiling is active, and add a page-aligned case that still requires xallocx shrink and grow to succeed, preserving commit/merge coverage. Assisted-by: Codex gpt-5.5 xhigh |
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| INSTALL.md | ||
| jemalloc.pc.in | ||
| Makefile.in | ||
| README | ||
| run_tests.sh | ||
| TUNING.md | ||
jemalloc is a general purpose malloc(3) implementation that emphasizes fragmentation avoidance and scalable concurrency support. jemalloc first came into use as the FreeBSD libc allocator in 2005, and since then it has found its way into numerous applications that rely on its predictable behavior. In 2010 jemalloc development efforts broadened to include developer support features such as heap profiling and extensive monitoring/tuning hooks. Modern jemalloc releases continue to be integrated back into FreeBSD, and therefore versatility remains critical. Ongoing development efforts trend toward making jemalloc among the best allocators for a broad range of demanding applications, and eliminating/mitigating weaknesses that have practical repercussions for real world applications. The COPYING file contains copyright and licensing information. The INSTALL file contains information on how to configure, build, and install jemalloc. The ChangeLog file contains a brief summary of changes for each release. URL: https://jemalloc.net/