mirror of
https://github.com/containers/youki
synced 2024-05-21 15:06:07 +02:00
165 lines
5.4 KiB
Rust
165 lines
5.4 KiB
Rust
use anyhow::{bail, Context, Result};
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use std::{collections::HashMap, path::Path};
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use super::controller::Controller;
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use crate::{
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common,
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stats::{parse_single_value, supported_page_sizes, HugeTlbStats, StatsProvider},
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};
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use oci_spec::{LinuxHugepageLimit, LinuxResources};
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pub struct HugeTlb {}
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impl Controller for HugeTlb {
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fn apply(linux_resources: &LinuxResources, cgroup_root: &std::path::Path) -> Result<()> {
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log::debug!("Apply hugetlb cgroup v2 config");
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if let Some(hugepage_limits) = linux_resources.hugepage_limits.as_ref() {
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for hugetlb in hugepage_limits {
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Self::apply(cgroup_root, hugetlb)?
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}
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}
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Ok(())
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}
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}
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impl StatsProvider for HugeTlb {
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type Stats = HashMap<String, HugeTlbStats>;
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fn stats(cgroup_path: &Path) -> Result<Self::Stats> {
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let page_sizes = supported_page_sizes()?;
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let mut hugetlb_stats = HashMap::with_capacity(page_sizes.len());
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for page_size in page_sizes {
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hugetlb_stats.insert(
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page_size.clone(),
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Self::stats_for_page_size(cgroup_path, &page_size)?,
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);
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}
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Ok(hugetlb_stats)
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}
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}
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impl HugeTlb {
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fn apply(root_path: &Path, hugetlb: &LinuxHugepageLimit) -> Result<()> {
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let page_size: String = hugetlb
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.page_size
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.chars()
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.take_while(|c| c.is_digit(10))
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.collect();
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let page_size: u64 = page_size.parse()?;
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if !Self::is_power_of_two(page_size) {
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bail!("page size must be in the format of 2^(integer)");
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}
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common::write_cgroup_file(
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root_path.join(format!("hugetlb.{}.limit_in_bytes", hugetlb.page_size)),
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hugetlb.limit,
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)?;
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Ok(())
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}
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fn is_power_of_two(number: u64) -> bool {
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(number != 0) && (number & (number - 1)) == 0
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}
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fn stats_for_page_size(cgroup_path: &Path, page_size: &str) -> Result<HugeTlbStats> {
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let events_file = format!("hugetlb.{}.events", page_size);
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let events = common::read_cgroup_file(cgroup_path.join(&events_file))?;
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let fail_count: u64 = events
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.lines()
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.find(|l| l.starts_with("max"))
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.map(|l| l[3..].trim().parse())
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.transpose()
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.with_context(|| format!("failed to parse max value for {}", events_file))?
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.unwrap_or_default();
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Ok(HugeTlbStats {
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usage: parse_single_value(&cgroup_path.join(format!("hugetlb.{}.current", page_size)))?,
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fail_count,
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..Default::default()
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})
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}
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::test::{create_temp_dir, set_fixture};
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use oci_spec::LinuxHugepageLimit;
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use std::fs::read_to_string;
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#[test]
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fn test_set_hugetlb() {
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let page_file_name = "hugetlb.2MB.limit_in_bytes";
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let tmp = create_temp_dir("test_set_hugetlbv2").expect("create temp directory for test");
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set_fixture(&tmp, page_file_name, "0").expect("Set fixture for 2 MB page size");
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let hugetlb = LinuxHugepageLimit {
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page_size: "2MB".to_owned(),
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limit: 16384,
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};
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HugeTlb::apply(&tmp, &hugetlb).expect("apply hugetlb");
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let content = read_to_string(tmp.join(page_file_name)).expect("Read hugetlb file content");
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assert_eq!(hugetlb.limit.to_string(), content);
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}
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#[test]
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fn test_set_hugetlb_with_invalid_page_size() {
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let tmp = create_temp_dir("test_set_hugetlbv2_with_invalid_page_size")
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.expect("create temp directory for test");
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let hugetlb = LinuxHugepageLimit {
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page_size: "3MB".to_owned(),
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limit: 16384,
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};
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let result = HugeTlb::apply(&tmp, &hugetlb);
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assert!(
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result.is_err(),
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"page size that is not a power of two should be an error"
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);
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}
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quickcheck! {
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fn property_test_set_hugetlb(hugetlb: LinuxHugepageLimit) -> bool {
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let page_file_name = format!("hugetlb.{:?}.limit_in_bytes", hugetlb.page_size);
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let tmp = create_temp_dir("property_test_set_hugetlbv2").expect("create temp directory for test");
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set_fixture(&tmp, &page_file_name, "0").expect("Set fixture for page size");
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let result = HugeTlb::apply(&tmp, &hugetlb);
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let page_size: String = hugetlb
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.page_size
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.chars()
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.take_while(|c| c.is_digit(10))
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.collect();
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let page_size: u64 = page_size.parse().expect("parse page size");
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if HugeTlb::is_power_of_two(page_size) && page_size != 1 {
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let content =
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read_to_string(tmp.join(page_file_name)).expect("Read hugetlb file content");
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hugetlb.limit.to_string() == content
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} else {
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result.is_err()
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}
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}
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}
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#[test]
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fn test_stat_hugetbl() {
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let tmp = create_temp_dir("test_stat_hugetlb").expect("create temp directory for test");
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set_fixture(&tmp, "hugetlb.2MB.current", "1024\n").expect("set hugetlb current");
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set_fixture(&tmp, "hugetlb.2MB.events", "max 5\n").expect("set hugetlb events");
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let actual = HugeTlb::stats_for_page_size(&tmp, "2MB").expect("get cgroup stats");
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let expected = HugeTlbStats {
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usage: 1024,
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max_usage: 0,
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fail_count: 5,
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};
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assert_eq!(actual, expected);
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}
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}
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