Enum numa_gpu::runtime::numa::PageType

pub enum PageType {
    Default,
    Small,
    TransparentHuge,
    Huge2MB,
    Huge16MB,
    Huge1GB,
    Huge16GB,
}

Specifies the allocation page type

Linux supports multiple page sizes, as well as transparent huge pages. PageType configures type of pages (default, THP, HugeTLB) and page size used for a memory allocation.

Additional steps required

Before huge pages can be allocated, they first must be enabled by the system administrator. For example, this can be done by running:

echo 20 > /proc/sys/vm/nr_overcommit_hugepages

Documentation

See the Linux kernel documentation on transparent huge pages and HugeTLB for details.

Variants

Default

The default page type

As configured in the operating system. Modern Linux systems usually have transparent huge pages enabled.

Small

Small pages

Forces the use of small pages with madvise. Thus, small pages are allocated even if transparent huge pages are enabled. The small page size depends on the processor architecture. For x86_64 it’s 4 KiB, for ppc64le it’s 64 KiB.

TransparentHuge

Transparent huge pages

Forces the use of transparent huge pages with madvise, even if huge pages are disabled.

Huge2MB

2 MiB huge pages

Allocates 2 MiB huge pages using HugeTLB with mmap.

Huge16MB

16 MiB huge pages

Allocates 16 MiB huge pages using HugeTLB with mmap.

Huge1GB

1 GiB huge pages

Allocates 1 GiB huge pages using HugeTLB with mmap.

Huge16GB

16 GiB huge pages

Allocates 16 GiB huge pages using HugeTLB with mmap.

Trait Implementations

impl Clone for PageType

fn clone(&self) -> PageType

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PageType

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl PartialEq<PageType> for PageType

fn eq(&self, other: &PageType) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl Copy for PageType

impl Eq for PageType

impl StructuralEq for PageType

impl StructuralPartialEq for PageType