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cgroups: fix the issue of getting wrong online cpus

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It's better to get the online cpus from
"/sys/devices/system/cpu/online" instead of from
cpuset cgroup, cause there would be an latency
between one cpu online and present in the root
cpuset cgroup.

Fixes: #1536

Signed-off-by: fupan.lfp <fupan.lfp@antfin.com>
This commit is contained in:
fupan.lfp 2021-03-23 14:35:47 +08:00
parent 5b5b5cc611
commit 3f46e6379d
1 changed files with 5 additions and 16 deletions
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21
src/agent/rustjail/src/cgroups/fs/mod.rs
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@ -37,6 +37,8 @@ use std::collections::HashMap;
use std::fs;
use std::path::Path;
const GUEST_CPUS_PATH: &str = "/sys/devices/system/cpu/online";
// Convenience macro to obtain the scope logger
macro_rules! sl {
() => {
@ -1027,23 +1029,10 @@ impl Manager {
}
}
// get the guest's online cpus.
pub fn get_guest_cpuset() -> Result<String> {
// for cgroup v2
if cgroups::hierarchies::is_cgroup2_unified_mode() {
let c = fs::read_to_string("/sys/fs/cgroup/cpuset.cpus.effective")?;
return Ok(c);
}
// for cgroup v1
let m = get_mounts()?;
if m.get("cpuset").is_none() {
warn!(sl!(), "no cpuset cgroup!");
return Err(nix::Error::Sys(Errno::ENOENT).into());
}
let p = format!("{}/cpuset.cpus", m.get("cpuset").unwrap());
let c = fs::read_to_string(p.as_str())?;
Ok(c)
let c = fs::read_to_string(GUEST_CPUS_PATH)?;
Ok(c.trim().to_string())
}
// Since the OCI spec is designed for cgroup v1, in some cases