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Fixes for ps on Linux (#6858)

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* Fix ps returning nothing when process dies

* Fix ps CPU calcs on Linux, remove unused thread code
This commit is contained in:
Reilly Wood 2022-10-22 09:54:46 -07:00 committed by GitHub
parent a3dce8ff19
commit fe7e87ee02
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 37 additions and 99 deletions
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1
Cargo.lock generated
View file

@ -2863,6 +2863,7 @@ dependencies = [
"errno",
"libc",
"libproc",
"log",
"mach2",
"nix 0.24.2",
"ntapi 0.3.7",

1
crates/nu-system/Cargo.toml
View file

@ -15,6 +15,7 @@ path = "src/main.rs"
[dependencies]
libc = "0.2"
log = "0.4"
[target.'cfg(target_family = "unix")'.dependencies]
nix = "0.24"

134
crates/nu-system/src/linux.rs
View file

@ -1,6 +1,6 @@
use procfs::process::{FDInfo, Io, Process, Stat, Status, TasksIter};
use log::info;
use procfs::process::{FDInfo, Io, Process, Stat, Status};
use procfs::{ProcError, ProcessCgroup};
use std::collections::HashMap;
use std::thread;
use std::time::{Duration, Instant};
@ -73,59 +73,43 @@ pub struct ProcessInfo {
pub pid: i32,
pub ppid: i32,
pub curr_proc: ProcessTask,
pub prev_proc: ProcessTask,
pub curr_io: Option<Io>,
pub prev_io: Option<Io>,
pub curr_stat: Option<Stat>,
pub prev_stat: Option<Stat>,
pub curr_status: Option<Status>,
pub interval: Duration,
}
pub fn collect_proc(interval: Duration, with_thread: bool) -> Vec<ProcessInfo> {
pub fn collect_proc(interval: Duration, _with_thread: bool) -> Vec<ProcessInfo> {
let mut base_procs = Vec::new();
let mut base_tasks = HashMap::new();
let mut ret = Vec::new();
// Take an initial snapshot of process I/O and CPU info, so we can calculate changes over time
if let Ok(all_proc) = procfs::process::all_processes() {
for proc in all_proc.flatten() {
let io = proc.io().ok();
let stat = proc.stat().ok();
let time = Instant::now();
if with_thread {
if let Ok(iter) = proc.tasks() {
collect_task(iter, &mut base_tasks);
}
}
base_procs.push((proc.pid(), proc, io, time));
// match proc {
// Ok(p) => {
// let io = p.io().ok();
// let time = Instant::now();
// if with_thread {
// if let Ok(iter) = p.tasks() {
// collect_task(iter, &mut base_tasks);
// }
// }
// base_procs.push((p.pid(), p, io, time));
// }
// Err(_) => {}
// }
base_procs.push((proc.pid(), io, stat, time));
}
}
// wait a bit...
thread::sleep(interval);
for (pid, prev_proc, prev_io, prev_time) in base_procs {
// now get process info again, build up results
for (pid, prev_io, prev_stat, prev_time) in base_procs {
let curr_proc_pid = pid;
let prev_proc_pid = prev_proc.pid();
let curr_proc = match Process::new(curr_proc_pid) {
Ok(p) => p,
Err(_) => return Vec::<ProcessInfo>::new(),
};
let prev_proc = match Process::new(prev_proc_pid) {
Ok(p) => p,
Err(_) => return Vec::<ProcessInfo>::new(),
let curr_proc = if let Ok(p) = Process::new(curr_proc_pid) {
p
} else {
info!("failed to retrieve info for pid={curr_proc_pid}, process probably died between snapshots");
continue;
};
let curr_io = curr_proc.io().ok();
let curr_stat = curr_proc.stat().ok();
let curr_status = curr_proc.status().ok();
let curr_time = Instant::now();
let interval = curr_time - prev_time;
@ -133,78 +117,26 @@ pub fn collect_proc(interval: Duration, with_thread: bool) -> Vec<ProcessInfo> {
Ok(p) => p.ppid,
Err(_) => 0,
};
let owner = curr_proc.uid().unwrap_or(0);
let mut curr_tasks = HashMap::new();
if with_thread {
if let Ok(iter) = curr_proc.tasks() {
collect_task(iter, &mut curr_tasks);
}
}
let curr_proc = ProcessTask::Process(curr_proc);
let prev_proc = ProcessTask::Process(prev_proc);
let proc = ProcessInfo {
pid,
ppid,
curr_proc,
prev_proc,
curr_io,
prev_io,
curr_stat,
prev_stat,
curr_status,
interval,
};
ret.push(proc);
for (tid, (pid, curr_stat, curr_status, curr_io)) in curr_tasks {
if let Some((_, prev_stat, _, prev_io)) = base_tasks.remove(&tid) {
let proc = ProcessInfo {
pid: tid,
ppid: pid,
curr_proc: ProcessTask::Task {
stat: Box::new(curr_stat),
owner,
},
prev_proc: ProcessTask::Task {
stat: Box::new(prev_stat),
owner,
},
curr_io,
prev_io,
curr_status,
interval,
};
ret.push(proc);
}
}
}
ret
}
#[allow(clippy::type_complexity)]
fn collect_task(iter: TasksIter, map: &mut HashMap<i32, (i32, Stat, Option<Status>, Option<Io>)>) {
for task in iter {
let task = if let Ok(x) = task {
x
} else {
continue;
};
if task.tid != task.pid {
let stat = if let Ok(x) = task.stat() {
x
} else {
continue;
};
let status = task.status().ok();
let io = task.io().ok();
map.insert(task.tid, (task.pid, stat, status, io));
}
}
}
impl ProcessInfo {
/// PID of process
pub fn pid(&self) -> i32 {
@ -263,18 +195,22 @@ impl ProcessInfo {
/// CPU usage as a percent of total
pub fn cpu_usage(&self) -> f64 {
let curr_time = match self.curr_proc.stat() {
Ok(c) => c.utime + c.stime,
Err(_) => 0,
};
let prev_time = match self.prev_proc.stat() {
Ok(c) => c.utime + c.stime,
Err(_) => 0,
};
let usage_ms =
(curr_time - prev_time) * 1000 / procfs::ticks_per_second().unwrap_or(100) as u64;
let interval_ms = self.interval.as_secs() * 1000 + u64::from(self.interval.subsec_millis());
usage_ms as f64 * 100.0 / interval_ms as f64
if let Some(cs) = &self.curr_stat {
if let Some(ps) = &self.prev_stat {
let curr_time = cs.utime + cs.stime;
let prev_time = ps.utime + ps.stime;
let usage_ms = (curr_time - prev_time) * 1000
/ procfs::ticks_per_second().unwrap_or(100) as u64;
let interval_ms =
self.interval.as_secs() * 1000 + u64::from(self.interval.subsec_millis());
usage_ms as f64 * 100.0 / interval_ms as f64
} else {
0.0
}
} else {
0.0
}
}
/// Memory size in number of bytes