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Update YJIT section of NEWS.md (#6803)

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* Update YJIT section of `NEWS.md`

* Update NEWS.md
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Maxime Chevalier-Boisvert 2022-11-24 16:37:04 -05:00 committed by GitHub
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@ -370,17 +370,25 @@ The following deprecated APIs are removed.
### YJIT ### YJIT
* Support arm64 / aarch64 on UNIX platforms. * YJIT now supports both x86-64 and arm64/aarch64 CPUs on Linux, MacOS, BSD and other UNIX platforms.
* This release brings support for Mac M1/M2, AWS Graviton and Raspberry Pi 4 ARM64 processors.
* Building YJIT requires Rust 1.58.0+. [[Feature #18481]] * Building YJIT requires Rust 1.58.0+. [[Feature #18481]]
* In order to ensure that CRuby is built with YJIT, please install rustc >= 1.58.0 and
run `./configure` with `--enable-yjit`.
* Please reach out to the YJIT team should you run into any issues.
* Physical memory for JIT code is lazily allocated. Unlike Ruby 3.1, * Physical memory for JIT code is lazily allocated. Unlike Ruby 3.1,
the RSS of a Ruby process is minimized because virtual memory pages the RSS of a Ruby process is minimized because virtual memory pages
allocated by `--yjit-exec-mem-size` will not be mapped to physical allocated by `--yjit-exec-mem-size` will not be mapped to physical
memory pages until actually utilized by JIT code. memory pages until actually utilized by JIT code.
* Introduce Code GC that frees all code pages when the memory consumption * Introduce Code GC that frees all code pages when the memory consumption
by JIT code reaches `--yjit-exec-mem-size`. by JIT code reaches `--yjit-exec-mem-size`.
* `RubyVM::YJIT.runtime_stats` returns Code GC metrics in addition to * `RubyVM::YJIT.runtime_stats` returns Code GC metrics in addition to
existing `inline_code_size` and `outlined_code_size` keys: existing `inline_code_size` and `outlined_code_size` keys:
`code_gc_count`, `live_page_count`, `freed_page_count`, and `freed_code_size`. `code_gc_count`, `live_page_count`, `freed_page_count`, and `freed_code_size`.
* Most of the statistics produced by `RubyVM::YJIT.runtime_stats` are now available in release builds.
* Simply run ruby with `--yjit-stats` to compute stats (incurs some run-time overhead).
* YJIT is now optimized to take advantage of object shapes. [[Feature #18776]]
* Take advantage of finer-grained constant invalidation to invalidate less code when defining new constants. [[Feature #18589]]
### MJIT ### MJIT
@ -438,6 +446,7 @@ The following deprecated APIs are removed.
[Feature #18630]: https://bugs.ruby-lang.org/issues/18630 [Feature #18630]: https://bugs.ruby-lang.org/issues/18630
[Bug #18633]: https://bugs.ruby-lang.org/issues/18633 [Bug #18633]: https://bugs.ruby-lang.org/issues/18633
[Feature #18685]: https://bugs.ruby-lang.org/issues/18685 [Feature #18685]: https://bugs.ruby-lang.org/issues/18685
[Feature #18776]: https://bugs.ruby-lang.org/issues/18776
[Bug #18782]: https://bugs.ruby-lang.org/issues/18782 [Bug #18782]: https://bugs.ruby-lang.org/issues/18782
[Feature #18788]: https://bugs.ruby-lang.org/issues/18788 [Feature #18788]: https://bugs.ruby-lang.org/issues/18788
[Feature #18809]: https://bugs.ruby-lang.org/issues/18809 [Feature #18809]: https://bugs.ruby-lang.org/issues/18809