mmtk::util::metadata::side_metadata::helpers

Function log_data_meta_ratio

source 
pub(super) const fn log_data_meta_ratio(
    metadata_spec: &SideMetadataSpec,
) -> usize
Expand description

Return the base-2 logarithm of the ratio of data bits and metadata bits per region.

Suppose a memory region has data_bits bits of data, and meta_bits bits of metadata for metadata_spec, and the result of log_data_meta_ratio(metadata_spec) is shift, then

  • data_bits >> shift == meta_bits
  • meta_bits << shift == data_bits