[jdk17u-dev] RFR: 8314220: Configurable InlineCacheBuffer size

Aleksey Shipilev shade at openjdk.org
Tue Dec 5 18:16:47 UTC 2023


Unclean backport to allow a tunable for IC buffer size, to avoid excess `ICBufferFull` safepoints in some workloads.

The backport is not clean for two reasons:
 1. Usual `NULL` and `nullptr` context conflict.
 2. `% CodeEntryAlignment` and `% stub_alignment()` conflict due to missing [JDK-8284578](https://bugs.openjdk.org/browse/JDK-8284578) in JDK 17u. We could backport that one first, as we expect some other backports in this area as well, like [JDK-8321137](https://bugs.openjdk.org/browse/JDK-8321137). But it was rejected one time, so I would rather see JDK-8321137 to pan out, and then resolve a little conflict introduced by this change later.

Additional testing:
 - [x] Eyeballing `-XX:+TraceICBuffer` output on ad-hoc workloads

-------------

Commit messages:
 - Backport a40d8d97e84d88d1a65aba81bfc09339be95e427

Changes: https://git.openjdk.org/jdk17u-dev/pull/2015/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=2015&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8314220
  Stats: 11 lines in 4 files changed: 8 ins; 2 del; 1 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/2015.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev.git pull/2015/head:pull/2015

PR: https://git.openjdk.org/jdk17u-dev/pull/2015


More information about the jdk-updates-dev mailing list