Expand description
§SCX Cpumask
A crate that allows creating, reading, and manipulating cpumasks.
§Cpumask
A Cpumask object is simply a BitVec of u64’s, along with a series of helper functions for creating, manipulating, and reading these BitVec objects.
Empty Cpumasks can be created directly, or they can be created from a hexadecimal string:
use scx_utils::Cpumask;
let all_zeroes = Cpumask::new();
let from_str_mask = Cpumask::from_str("0xf0");The hexadecimal string also supports the special values “none” and “all”, respectively to specify no CPU (empty mask) or all CPUs (full mask):
use scx_utils::Cpumask;
let str = String::from("none");
let all_zeroes = Cpumask::from_str(&str);
let str = String::from("all");
let all_ones = Cpumask::from_str(&str);A Cpumask can be queried and updated using its helper functions:
use log::info;
use scx_utils::Cpumask;
let str = String::from("none");
let mut mask = Cpumask::from_str(&str).unwrap();
info!("{:#?}", mask); // 32:<11111111000000001111111100000000>
assert!(!mask.test_cpu(0));
mask.set_cpu(0);
assert!(mask.test_cpu(0));
mask.clear_all();
info!("{:#?}", mask); // 32:<00000000000000000000000000000000>
assert!(!mask.test_cpu(0));
mask.set_all();
info!("{:#?}", mask); // 32:<11111111111111111111111111111111>
assert!(mask.test_cpu(0));