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184f304dd3
src/stats.c fused mallctl reads with dual-format (text/JSON) emission inside a
few very large, bottom-up functions, behind dense macros, with the public entry
point at the very bottom. Rework it to be output-preserving but much easier to
read and extend:
- Separate gathering from emission where it is worth it: most sections become a
small gather (stats_gather_*, the mallctl reads into a typed struct) plus an
emit that renders it, with the plumbing macros (CTL_*, COL*) and gather
structs moved to internal header (stats_internal.h). This is a balance,
not a rule: the per-size-class tables stay O(1) streaming (per-row gather+emit,
no large stack buffers, avoiding heap buffering), the mutex rows keep reading
straight into emitter columns, and the already-readable config/opt probes are
left as they are.
- Read like the output: open with a table-of-contents comment and the public
stats_print(), then the section functions top-down, keeping the
interval/boot/fork plumbing at the bottom. The ToC names the function that
prints each section, and its JSON sub-path.
- Keep one emission engine: the emitter remains the single dual-format renderer,
so each section has one rendering path rather than parallel renderers (the two
formats are not field-identical). Move some table-only concerns into it --
gap-collapsing ("---") and a dual columnar row op (emitter_row) -- so section
code carries less table-format detail.
Output-preserving: text is byte-identical and JSON keys/values are unchanged.
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/