Struct mmtk::util::metadata::side_metadata::global::SideMetadataContext

pub(crate) struct SideMetadataContext {
    pub global: Vec<SideMetadataSpec>,
    pub local: Vec<SideMetadataSpec>,
}

This struct stores all the side metadata specs for a policy. Generally a policy needs to know its own side metadata spec as well as the plan’s specs.

Fields

global: Vec<SideMetadataSpec>

local: Vec<SideMetadataSpec>

Implementations

impl SideMetadataContext

pub fn new_global_specs(specs: &[SideMetadataSpec]) -> Vec<SideMetadataSpec>

pub fn get_local_specs(&self) -> &[SideMetadataSpec]

pub fn calculate_reserved_pages(&self, data_pages: usize) -> usize

Return the pages reserved for side metadata based on the data pages we used.

pub fn try_map_metadata_space(&self, start: Address, size: usize) -> Result<()>

Tries to map the required metadata space and returns true is successful. This can be called at page granularity.

pub fn try_map_metadata_address_range( &self, start: Address, size: usize ) -> Result<()>

Tries to map the required metadata address range, without reserving swap-space/physical memory for it. This will make sure the address range is exclusive to the caller. This should be called at chunk granularity.

NOTE: Accessing addresses in this range will produce a segmentation fault if swap-space is not mapped using the try_map_metadata_space function.

fn map_metadata_internal( &self, start: Address, size: usize, no_reserve: bool ) -> Result<()>

The internal function to mmap metadata

Arguments

• start - The starting address of the source data.
• size - The size of the source data (in bytes).
• no_reserve - whether to invoke mmap with a noreserve flag (we use this flag to quarantine address range)