mirror of
https://github.com/containers/youki
synced 2024-05-17 21:16:30 +02:00
241 lines
7.2 KiB
Rust
241 lines
7.2 KiB
Rust
use std::path::Path;
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use anyhow::{bail, Context, Result};
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use oci_spec::{LinuxCpu, LinuxResources};
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use crate::{
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common,
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stats::{CpuThrottling, StatsProvider},
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};
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use super::Controller;
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const CGROUP_CPU_SHARES: &str = "cpu.shares";
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const CGROUP_CPU_QUOTA: &str = "cpu.cfs_quota_us";
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const CGROUP_CPU_PERIOD: &str = "cpu.cfs_period_us";
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const CGROUP_CPU_RT_RUNTIME: &str = "cpu.rt_runtime_us";
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const CGROUP_CPU_RT_PERIOD: &str = "cpu.rt_period_us";
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const CGROUP_CPU_STAT: &str = "cpu.stat";
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pub struct Cpu {}
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impl Controller for Cpu {
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type Resource = LinuxCpu;
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fn apply(linux_resources: &LinuxResources, cgroup_root: &Path) -> Result<()> {
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log::debug!("Apply Cpu cgroup config");
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if let Some(cpu) = Self::needs_to_handle(linux_resources) {
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Self::apply(cgroup_root, cpu)?;
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}
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Ok(())
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}
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fn needs_to_handle(linux_resources: &LinuxResources) -> Option<&Self::Resource> {
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if let Some(cpu) = &linux_resources.cpu {
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if cpu.shares.is_some()
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|| cpu.period.is_some()
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|| cpu.quota.is_some()
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|| cpu.realtime_period.is_some()
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|| cpu.realtime_runtime.is_some()
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{
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return Some(cpu);
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}
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}
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None
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}
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}
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impl StatsProvider for Cpu {
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type Stats = CpuThrottling;
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fn stats(cgroup_path: &Path) -> Result<Self::Stats> {
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let mut stats = CpuThrottling::default();
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let stat_path = cgroup_path.join(CGROUP_CPU_STAT);
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let stat_content = common::read_cgroup_file(&stat_path)?;
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let parts: Vec<&str> = stat_content.split_ascii_whitespace().collect();
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if parts.len() < 6 {
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bail!(
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"{} contains less than the expected number of entries",
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stat_path.display()
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);
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}
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if parts[0] != "nr_periods" {
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bail!(
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"{} does not contain the number of elapsed periods",
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stat_path.display()
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);
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}
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if parts[2] != "nr_throttled" {
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bail!(
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"{} does not contain the number of throttled periods",
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stat_path.display()
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);
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}
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if parts[4] != "throttled_time" {
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bail!(
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"{} does not contain the total time tasks have spent throttled",
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stat_path.display()
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);
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}
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stats.periods = parts[1].parse().context("failed to parse nr_periods")?;
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stats.throttled_periods = parts[3].parse().context("failed to parse nr_throttled")?;
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stats.throttled_time = parts[5].parse().context("failed to parse throttled time")?;
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Ok(stats)
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}
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}
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impl Cpu {
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fn apply(root_path: &Path, cpu: &LinuxCpu) -> Result<()> {
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if let Some(cpu_shares) = cpu.shares {
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if cpu_shares != 0 {
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common::write_cgroup_file(root_path.join(CGROUP_CPU_SHARES), cpu_shares)?;
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}
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}
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if let Some(cpu_period) = cpu.period {
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if cpu_period != 0 {
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common::write_cgroup_file(root_path.join(CGROUP_CPU_PERIOD), cpu_period)?;
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}
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}
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if let Some(cpu_quota) = cpu.quota {
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if cpu_quota != 0 {
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common::write_cgroup_file(root_path.join(CGROUP_CPU_QUOTA), cpu_quota)?;
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}
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}
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if let Some(rt_runtime) = cpu.realtime_runtime {
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if rt_runtime != 0 {
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common::write_cgroup_file(root_path.join(CGROUP_CPU_RT_RUNTIME), rt_runtime)?;
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}
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}
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if let Some(rt_period) = cpu.realtime_period {
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if rt_period != 0 {
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common::write_cgroup_file(root_path.join(CGROUP_CPU_RT_PERIOD), rt_period)?;
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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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#[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, setup, LinuxCpuBuilder};
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use std::fs;
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#[test]
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fn test_set_shares() {
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// arrange
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let (tmp, shares) = setup("test_set_shares", CGROUP_CPU_SHARES);
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let _ = set_fixture(&tmp, CGROUP_CPU_SHARES, "")
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.unwrap_or_else(|_| panic!("set test fixture for {}", CGROUP_CPU_SHARES));
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let cpu = LinuxCpuBuilder::new().with_shares(2048).build();
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// act
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Cpu::apply(&tmp, &cpu).expect("apply cpu");
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// assert
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let content = fs::read_to_string(shares)
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.unwrap_or_else(|_| panic!("read {} file content", CGROUP_CPU_SHARES));
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assert_eq!(content, 2048.to_string());
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}
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#[test]
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fn test_set_quota() {
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// arrange
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const QUOTA: i64 = 200000;
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let (tmp, max) = setup("test_set_quota", CGROUP_CPU_QUOTA);
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let cpu = LinuxCpuBuilder::new().with_quota(QUOTA).build();
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// act
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Cpu::apply(&tmp, &cpu).expect("apply cpu");
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// assert
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let content = fs::read_to_string(max)
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.unwrap_or_else(|_| panic!("read {} file content", CGROUP_CPU_QUOTA));
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assert_eq!(content, QUOTA.to_string());
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}
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#[test]
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fn test_set_period() {
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// arrange
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const PERIOD: u64 = 100000;
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let (tmp, max) = setup("test_set_period", CGROUP_CPU_PERIOD);
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let cpu = LinuxCpuBuilder::new().with_period(PERIOD).build();
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// act
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Cpu::apply(&tmp, &cpu).expect("apply cpu");
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// assert
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let content = fs::read_to_string(max)
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.unwrap_or_else(|_| panic!("read {} file content", CGROUP_CPU_PERIOD));
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assert_eq!(content, PERIOD.to_string());
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}
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#[test]
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fn test_set_rt_runtime() {
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// arrange
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const RUNTIME: i64 = 100000;
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let (tmp, max) = setup("test_set_rt_runtime", CGROUP_CPU_RT_RUNTIME);
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let cpu = LinuxCpuBuilder::new()
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.with_realtime_runtime(RUNTIME)
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.build();
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// act
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Cpu::apply(&tmp, &cpu).expect("apply cpu");
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// assert
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let content = fs::read_to_string(max)
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.unwrap_or_else(|_| panic!("read {} file content", CGROUP_CPU_RT_RUNTIME));
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assert_eq!(content, RUNTIME.to_string());
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}
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#[test]
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fn test_set_rt_period() {
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// arrange
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const PERIOD: u64 = 100000;
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let (tmp, max) = setup("test_set_rt_period", CGROUP_CPU_RT_PERIOD);
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let cpu = LinuxCpuBuilder::new().with_realtime_period(PERIOD).build();
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// act
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Cpu::apply(&tmp, &cpu).expect("apply cpu");
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// assert
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let content = fs::read_to_string(max)
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.unwrap_or_else(|_| panic!("read {} file content", CGROUP_CPU_RT_PERIOD));
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assert_eq!(content, PERIOD.to_string());
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}
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#[test]
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fn test_stat_cpu_throttling() {
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let tmp = create_temp_dir("test_stat_cpu_throttling").expect("create test directory");
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let stat_content = &[
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"nr_periods 165000",
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"nr_throttled 27",
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"throttled_time 1080",
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]
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.join("\n");
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set_fixture(&tmp, CGROUP_CPU_STAT, stat_content).expect("create stat file");
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let actual = Cpu::stats(&tmp).expect("get cgroup stats");
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let expected = CpuThrottling {
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periods: 165000,
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throttled_periods: 27,
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throttled_time: 1080,
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};
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assert_eq!(actual, expected);
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}
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}
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