Method mremap0

core/src/main/java/io/questdb/std/MmapCache.java:310–321

(int fd, long address, long previousSize, long newSize, long offset, int flags, int oldMemoryTag, int memoryTag)

    }

    private static long mremap0(int fd, long address, long previousSize, long newSize, long offset, int flags, int oldMemoryTag, int memoryTag) {
        address = Files.mremap0(fd, address, previousSize, newSize, offset, flags);
        if (address != -1) {
            if (oldMemoryTag == memoryTag) {
                Unsafe.recordMemAlloc(newSize - previousSize, memoryTag);
            } else {
                Unsafe.recordMemAlloc(newSize, memoryTag);
                Unsafe.recordMemAlloc(-previousSize, oldMemoryTag);
            }
        }
        return address;
    }

    private static void munmapTaskConsumer(MunmapTask task) {
        int result = Files.munmap0(task.address, task.size);