Struct PageFaultCounter 

pub struct PageFaultCounter { /* private fields */ }

Stores monotonic counters of page refaults and total page faults in a shared VMO.

Both counters are measured in pages supplied by the userspace pager (including readahead), rather than the number of pager requests:

• refault_count_ptr (offset 0): pages supplied that had already been supplied before and were subsequently evicted.
• fault_count_ptr (offset 8): total pages supplied by the userspace pager.

Implementations

impl PageFaultCounter

pub fn new() -> Result<Self, Status>

Creates a new read-write PageFaultCounter.

pub fn from_vmo_readonly(vmo: Vmo) -> Result<Self, Status>

Creates a new read-only PageFaultCounter from the provided VMO. The VMO must have the READ, MAP, and GET_PROPERTY rights.

pub fn increment_refaults(&self, count: u64, order: Ordering)

Increments the page refault counter by count pages (pages resupplied after eviction).

pub fn read_refaults(&self, order: Ordering) -> u64

Reads the page refault counter (in pages).

pub fn increment_faults(&self, count: u64, order: Ordering)

Increments the total page fault counter by count pages (total pages supplied by the userspace pager, including readahead).

pub fn read_faults(&self, order: Ordering) -> u64

Reads the total page fault counter (in pages supplied).

pub fn readonly_vmo(&self) -> Result<Vmo, Status>

Returns a read-only handle for the backing VMO.

Trait Implementations

impl Send for PageFaultCounter

impl Sync for PageFaultCounter