Files
Jonathan Schwender 516dba791f allocator: Add libc Heap information on macos (#44037)
Despite using `jemalloc` by default on macos as the Rust global
allocator, the default system allocator will still be used by some C/C++
libraries.
Using `malloc_zone_statistics` on macos allows us to get information
about the system allocator heap usage.
Since the macos statistic also provides information about reserved, but
currently unused memory, we also expose that and attempt to calculate
the same metric on Linux, which should be
arena (Non-mmapped space allocated (bytes)) + hblkhd (Space allocated in
mmapped regions (bytes)) See
https://man7.org/linux/man-pages/man3/mallinfo.3.html

Loading `servo.org` in a debug build on macOS and then navigating to
about:memory, I see 31MB system-heap-allocated and 92 MB
system-heap-reserved.

Testing: Manually tested on macOS. Not tested on Linux.

---------

Signed-off-by: Jonathan Schwender <schwenderjonathan@gmail.com>
2026-04-08 18:23:49 +00:00
..