The Transparent HugePages (THP) feature is enabled by default in Oracle Linux. With THP, the kernel automatically assigns huge pages to processes. With THP, you can assign only 2 MB pages on x86_64 platforms.

THP can run in the following modes:

• system-wide (default): The kernel assigns huge pages to processes that use large contiguous virtual memory areas whenever it's possible to do so.
• per-process: The kernel only assigns huge pages to application processes that explicitly request huge pages through the madvise() system call.

For more information about configuring THP, see Configuring Transparent HugePages