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#[derive(Debug)]
pub struct Mem {
#[cfg(target_os = "linux")]
cgroups: Option<cgroups_mem::CgroupsMem>,
sysinfo: sysinfo_mem::SysinfoMem,
}
impl Mem {
#[allow(clippy::new_without_default)]
pub fn new() -> Self {
Self {
#[cfg(target_os = "linux")]
cgroups: cgroups_mem::CgroupsMem::new(),
sysinfo: sysinfo_mem::SysinfoMem::new(),
}
}
pub fn refresh(&mut self) {
#[cfg(target_os = "linux")]
if let Some(cgroups) = &mut self.cgroups {
cgroups.refresh();
}
self.sysinfo.refresh();
}
pub fn total_memory_bytes(&self) -> u64 {
#[cfg(target_os = "linux")]
if let Some(cgroups) = &self.cgroups {
if let Some(memory_limit_bytes) = cgroups.memory_limit_bytes() {
return memory_limit_bytes;
}
}
self.sysinfo.total_memory_bytes()
}
pub fn available_memory_bytes(&self) -> u64 {
#[cfg(target_os = "linux")]
if let Some(cgroups) = &self.cgroups {
if let Some(memory_limit_bytes) = cgroups.memory_limit_bytes() {
return memory_limit_bytes.saturating_sub(cgroups.used_memory_bytes());
}
}
self.sysinfo.available_memory_bytes()
}
}
#[cfg(target_os = "linux")]
mod cgroups_mem {
use cgroups_rs::{hierarchies, memory, Cgroup};
use procfs::process::Process;
#[derive(Clone, Debug)]
pub struct CgroupsMem {
mem_controller: memory::MemController,
memory_limit_bytes: Option<u64>,
used_memory_bytes: u64,
}
impl CgroupsMem {
pub fn new() -> Option<Self> {
let memory_cgroup_path = match get_current_process_memory_cgroup_path() {
Ok(memory_cgroup_path) => memory_cgroup_path?,
Err(err) => {
log::error!(
"Failed to query current process info \
while initializing CgroupsMem: {err}"
);
return None;
}
};
let cgroup = Cgroup::load(
hierarchies::auto(),
memory_cgroup_path.trim_start_matches('/'),
);
let mut mem = Self {
mem_controller: cgroup.controller_of::<memory::MemController>()?.clone(),
memory_limit_bytes: None,
used_memory_bytes: 0,
};
mem.refresh();
Some(mem)
}
pub fn refresh(&mut self) {
let stat = self.mem_controller.memory_stat();
self.memory_limit_bytes = stat.limit_in_bytes.try_into().ok();
self.used_memory_bytes = stat.usage_in_bytes;
}
pub fn memory_limit_bytes(&self) -> Option<u64> {
self.memory_limit_bytes
}
pub fn used_memory_bytes(&self) -> u64 {
self.used_memory_bytes
}
}
fn get_current_process_memory_cgroup_path() -> procfs::ProcResult<Option<String>> {
let process = Process::myself()?;
let cgroups = process.cgroups()?;
for cgroup in cgroups {
// TODO: Can a process belong to multiple v2 cgroups!?
let is_v2_cgroup = cgroup.controllers.is_empty()
|| cgroup
.controllers
.iter()
.all(|controller| controller.is_empty());
// TODO: Can a process belong to multiple v1 cgroups, with some of these cgroups having the same controllers (e.g., memory)!?
let is_v1_memory_cgroup = cgroup
.controllers
.iter()
.any(|controller| controller == "memory");
if is_v2_cgroup || is_v1_memory_cgroup {
return Ok(Some(cgroup.pathname));
}
}
Ok(None)
}
}
mod sysinfo_mem {
use sysinfo::{MemoryRefreshKind, RefreshKind, System};
#[derive(Debug)]
pub struct SysinfoMem {
system: System,
}
impl SysinfoMem {
pub fn new() -> Self {
let system = System::new_with_specifics(
RefreshKind::new().with_memory(MemoryRefreshKind::everything()),
);
Self { system }
}
pub fn refresh(&mut self) {
self.system.refresh_memory();
}
pub fn total_memory_bytes(&self) -> u64 {
self.system.total_memory()
}
pub fn available_memory_bytes(&self) -> u64 {
self.system.available_memory()
}
}
}
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