Method mmap0

core/src/main/java/io/questdb/std/MmapCache.java:302–308

(int fd, long len, long offset, int flags, int memoryTag)

    }

    private static long mmap0(int fd, long len, long offset, int flags, int memoryTag) {
        long address = Files.mmap0(fd, len, offset, flags, 0);
        if (address != FilesFacade.MAP_FAILED) {
            Unsafe.recordMemAlloc(len, memoryTag);
        }
        return address;
    }

    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);