The ResourceHashtable conversion for JDK-8292741 didn't add the resizing code. The old hashtable code was tuned for resizing in anticipation of large hashtables for JVMTI tags. This patch ports over the old hashtable resizing code. It also adds a ResourceHashtable::put_fast() function that prepends to the bucket list, which is also reclaims the performance of the old hashtable for this test with 10M tags. The ResourceHashtable put function is really a put_if_absent. This can be cleaned up in a future change. Also, the remove function needed a lambda to destroy the WeakHandle, since resizing requires copying entries.
Tested with JVMTI and JDI tests locally, and tier1-4 tests. ------------- Commit messages: - put back the comment for put. - 8306843: JVMTI tag map extremely slow after JDK-8292741 Changes: https://git.openjdk.org/jdk/pull/13818/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13818&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8306843 Stats: 326 lines in 8 files changed: 242 ins; 41 del; 43 mod Patch: https://git.openjdk.org/jdk/pull/13818.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/13818/head:pull/13818 PR: https://git.openjdk.org/jdk/pull/13818
