RFR: 8349146: [REDO] Implement a better allocator for downcalls [v8]
Per Minborg
pminborg at openjdk.org
Fri May 2 11:13:27 UTC 2025
> This PR is based on the work of @mernst-github and aims to implement an _internal_ thread-local 'stack' allocator, which works like a dynamically sized arena, but with reset functionality to reset the allocated size back to a certain level. The underlying memory could stay around between calls, which could improve performance.
>
> Re-allocated segments are not zeroed between allocations.
Per Minborg has updated the pull request incrementally with one additional commit since the last revision:
Cleanup and only create CleanupAction once per thread
-------------
Changes:
- all: https://git.openjdk.org/jdk/pull/24829/files
- new: https://git.openjdk.org/jdk/pull/24829/files/dcce2e94..c819553c
Webrevs:
- full: https://webrevs.openjdk.org/?repo=jdk&pr=24829&range=07
- incr: https://webrevs.openjdk.org/?repo=jdk&pr=24829&range=06-07
Stats: 33 lines in 2 files changed: 15 ins; 8 del; 10 mod
Patch: https://git.openjdk.org/jdk/pull/24829.diff
Fetch: git fetch https://git.openjdk.org/jdk.git pull/24829/head:pull/24829
PR: https://git.openjdk.org/jdk/pull/24829
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