infernap12/jdk
1
0
Fork 0
mirror of https://github.com/openjdk/jdk.git synced 2026-04-27 07:10:45 +00:00
Code Issues Packages Projects Releases Wiki Activity

8367463: Improved Arena allocations

Browse Source 
Reviewed-by: rhalade, rriggs, jvernee
This commit is contained in:
Per Minborg 2025-10-29 15:25:44 +00:00 committed by Jaikiran Pai
parent 3f242123e0
commit 152a497007
1 changed files with 6 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
src/java.base/share/classes/jdk/internal/foreign/SegmentFactories.java
View File

@ -190,15 +190,16 @@ public class SegmentFactories {
if (VM.isDirectMemoryPageAligned()) {
byteAlignment = Math.max(byteAlignment, AbstractMemorySegmentImpl.NIO_ACCESS.pageSize());
}
// Always allocate at least some memory so that zero-length segments have distinct
// non-zero addresses.
byteSize = Math.max(1, byteSize);
// Align the allocation size up to a multiple of 8 so we can init the memory with longs
long alignedSize = init ? Utils.alignUp(byteSize, Long.BYTES) : byteSize;
// Check for wrap around
if (alignedSize < 0) {
throw new OutOfMemoryError();
}
// Always allocate at least some memory so that zero-length segments have distinct
// non-zero addresses.
alignedSize = Math.max(1, alignedSize);
long allocationSize;
long allocationBase;
@ -226,12 +227,13 @@ public class SegmentFactories {
if (init) {
initNativeMemory(result, alignedSize);
}
final long cleanupByteSize = byteSize;
sessionImpl.addOrCleanupIfFail(new MemorySessionImpl.ResourceList.ResourceCleanup() {
@Override
public void cleanup() {
UNSAFE.freeMemory(allocationBase);
if (shouldReserve) {
AbstractMemorySegmentImpl.NIO_ACCESS.unreserveMemory(allocationSize, byteSize);
AbstractMemorySegmentImpl.NIO_ACCESS.unreserveMemory(allocationSize, cleanupByteSize);
}
}
});