> Hi, > > This patch improves the performance of a typical `Arena::allocate` in several > ways: > > - Delay the creation of the NativeMemorySegmentImpl. This avoids the merge of > the instance with the one obtained from the call in the uncommon path, > increasing the chance the object being scalar replaced. > - Split the allocation of over-aligned memory to a slow-path method. > - Align the memory to 8 bytes, allowing faster zeroing. > - Use a dedicated method to zero the just-allocated native memory, reduce > code size and make it more straightforward. > - Make `VM.pageAlignDirectMemory` a `Boolean` instead of a `boolean` so that > `false` value can be constant folded. > > Please take a look and leave your reviews, thanks a lot.
Quan Anh Mai has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains eight additional commits since the last revision: - revert changes to CallocArena - Merge branch 'master' into segmentallocate - copyright - Merge branch 'master' into segmentallocate - wrong init - move segment instance creation to SegmentFactories - address review - improve the implementation of SegmentFactories::allocateSegment ------------- Changes: - all: https://git.openjdk.org/jdk/pull/22610/files - new: https://git.openjdk.org/jdk/pull/22610/files/d3cba466..f2330067 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=22610&range=04 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=22610&range=03-04 Stats: 34672 lines in 1350 files changed: 16246 ins; 10070 del; 8356 mod Patch: https://git.openjdk.org/jdk/pull/22610.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/22610/head:pull/22610 PR: https://git.openjdk.org/jdk/pull/22610
