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//! This module contains the implementation of the `cpuacct` cgroup subsystem.
//!
//! See the Kernel's documentation for more information about this subsystem, found at:
//! [Documentation/cgroup-v1/cpuacct.txt](https://www.kernel.org/doc/Documentation/cgroup-v1/cpuacct.txt)
use std::path::PathBuf;
use std::io::{Read, Write};
use std::fs::File;
use {Controllers, Resources, Subsystem, ControllIdentifier, Controller};
/// A controller that allows controlling the `cpuacct` subsystem of a Cgroup.
///
/// In essence, this control group provides accounting (hence the name `cpuacct`) for CPU usage of
/// the tasks in the control group.
#[derive(Debug, Clone)]
pub struct CpuAcctController {
base: PathBuf,
path: PathBuf,
}
/// Represents the statistics retrieved from the control group.
pub struct CpuAcct {
/// Divides the time used by the tasks into `user` time and `system` time.
pub stat: String,
/// Total CPU time (in nanoseconds) spent by the tasks.
pub usage: u64,
/// Total CPU time (in nanoseconds) spent by the tasks, broken down by CPU and by whether the
/// time spent is `user` time or `system` time.
///
/// An example is as follows:
/// ```
/// cpu user system
/// 0 8348363768 0
/// 1 8324369100 0
/// 2 8598185449 0
/// 3 8648262473 0
/// ```
pub usage_all: String,
/// CPU time (in nanoseconds) spent by the tasks, broken down by each CPU.
/// Times spent in each CPU are separated by a space.
pub usage_percpu: String,
/// As for `usage_percpu`, but the `system` time spent.
pub usage_percpu_sys: String,
/// As for `usage_percpu`, but the `user` time spent.
pub usage_percpu_user: String,
/// CPU time (in nanoseconds) spent by the tasks that counted for `system` time.
pub usage_sys: u64,
/// CPU time (in nanoseconds) spent by the tasks that counted for `user` time.
pub usage_user: u64,
}
impl Controller for CpuAcctController {
fn control_type(self: &Self) -> Controllers { Controllers::CpuAcct }
fn get_path<'a>(self: &'a Self) -> &'a PathBuf { &self.path }
fn get_path_mut<'a>(self: &'a mut Self) -> &'a mut PathBuf { &mut self.path }
fn get_base<'a>(self: &'a Self) -> &'a PathBuf { &self.base }
fn apply(self: &Self, _res: &Resources) {
}
}
impl ControllIdentifier for CpuAcctController {
fn controller_type() -> Controllers {
Controllers::CpuAcct
}
}
impl<'a> From<&'a Subsystem> for &'a CpuAcctController {
fn from(sub: &'a Subsystem) -> &'a CpuAcctController {
unsafe {
match sub {
Subsystem::CpuAcct(c) => c,
_ => {
assert_eq!(1, 0);
::std::mem::uninitialized()
},
}
}
}
}
fn read_u64_from(mut file: File) -> Option<u64> {
let mut string = String::new();
let _ = file.read_to_string(&mut string);
string.trim().parse().ok()
}
impl CpuAcctController {
/// Contructs a new `CpuAcctController` with `oroot` serving as the root of the control group.
pub fn new(oroot: PathBuf) -> Self {
let mut root = oroot;
root.push(Self::controller_type().to_string());
Self {
base: root.clone(),
path: root,
}
}
/// Gathers the statistics that are available in the control group into a `CpuAcct` structure.
pub fn cpuacct(self: &Self) -> CpuAcct {
CpuAcct {
stat: self.open_path("cpuacct.stat", false)
.and_then(|mut file| {
let mut string = String::new();
let _ = file.read_to_string(&mut string);
Some(string.trim().to_string())
}).unwrap_or("".to_string()),
usage: self.open_path("cpuacct.usage", false)
.and_then(|file| read_u64_from(file))
.unwrap_or(0),
usage_all: self.open_path("cpuacct.usage_all", false)
.and_then(|mut file| {
let mut string = String::new();
let _ = file.read_to_string(&mut string);
Some(string.trim().to_string())
}).unwrap_or("".to_string()),
usage_percpu: self.open_path("cpuacct.usage_percpu", false)
.and_then(|mut file| {
let mut string = String::new();
let _ = file.read_to_string(&mut string);
Some(string.trim().to_string())
}).unwrap_or("".to_string()),
usage_percpu_sys: self.open_path("cpuacct.usage_percpu_sys", false)
.and_then(|mut file| {
let mut string = String::new();
let _ = file.read_to_string(&mut string);
Some(string.trim().to_string())
}).unwrap_or("".to_string()),
usage_percpu_user: self.open_path("cpuacct.usage_percpu_user", false)
.and_then(|mut file| {
let mut string = String::new();
let _ = file.read_to_string(&mut string);
Some(string.trim().to_string())
}).unwrap_or("".to_string()),
usage_sys: self.open_path("cpuacct.usage_sys", false)
.and_then(|file| read_u64_from(file))
.unwrap_or(0),
usage_user: self.open_path("cpuacct.usage_user", false)
.and_then(|file| read_u64_from(file))
.unwrap_or(0),
}
}
/// Reset the statistics the kernel has gathered about the control group.
pub fn reset(self: &Self) {
self.open_path("cpuacct.usage", true).and_then(|mut file| {
file.write_all(b"0").ok()
});
}
}