| <!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/root/.cargo/registry/src/github.com-1ecc6299db9ec823/num_cpus-1.15.0/src/linux.rs`."><meta name="keywords" content="rust, rustlang, rust-lang"><title>linux.rs - source</title><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Regular.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../FiraSans-Medium.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Regular.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceSerif4-Bold.ttf.woff2"><link rel="preload" as="font" type="font/woff2" crossorigin href="../../SourceCodePro-Semibold.ttf.woff2"><link rel="stylesheet" href="../../normalize.css"><link rel="stylesheet" href="../../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" href="../../ayu.css" disabled><link rel="stylesheet" href="../../dark.css" disabled><link rel="stylesheet" href="../../light.css" id="themeStyle"><script id="default-settings" ></script><script src="../../storage.js"></script><script defer src="../../source-script.js"></script><script defer src="../../source-files.js"></script><script defer src="../../main.js"></script><noscript><link rel="stylesheet" href="../../noscript.css"></noscript><link rel="alternate icon" type="image/png" href="../../favicon-16x16.png"><link rel="alternate icon" type="image/png" href="../../favicon-32x32.png"><link rel="icon" type="image/svg+xml" href="../../favicon.svg"></head><body class="rustdoc source"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><a class="sidebar-logo" href="../../num_cpus/index.html"><div class="logo-container"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></div></a></nav><main><div class="width-limiter"><nav class="sub"><a class="sub-logo-container" href="../../num_cpus/index.html"><img class="rust-logo" src="../../rust-logo.svg" alt="logo"></a><form class="search-form"><div class="search-container"><span></span><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"><div id="help-button" title="help" tabindex="-1"><a href="../../help.html">?</a></div><div id="settings-menu" tabindex="-1"><a href="../../settings.html" title="settings"><img width="22" height="22" alt="Change settings" src="../../wheel.svg"></a></div></div></form></nav><section id="main-content" class="content"><div class="example-wrap"><pre class="src-line-numbers"><span id="1">1</span> |
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| <span id="539">539</span> |
| <span id="540">540</span> |
| <span id="541">541</span> |
| <span id="542">542</span> |
| <span id="543">543</span> |
| <span id="544">544</span> |
| <span id="545">545</span> |
| <span id="546">546</span> |
| <span id="547">547</span> |
| <span id="548">548</span> |
| <span id="549">549</span> |
| <span id="550">550</span> |
| <span id="551">551</span> |
| <span id="552">552</span> |
| <span id="553">553</span> |
| <span id="554">554</span> |
| <span id="555">555</span> |
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| <span id="561">561</span> |
| <span id="562">562</span> |
| <span id="563">563</span> |
| <span id="564">564</span> |
| <span id="565">565</span> |
| <span id="566">566</span> |
| <span id="567">567</span> |
| <span id="568">568</span> |
| <span id="569">569</span> |
| <span id="570">570</span> |
| <span id="571">571</span> |
| <span id="572">572</span> |
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| <span id="574">574</span> |
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| <span id="576">576</span> |
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| <span id="580">580</span> |
| <span id="581">581</span> |
| <span id="582">582</span> |
| <span id="583">583</span> |
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| <span id="585">585</span> |
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| <span id="589">589</span> |
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| <span id="592">592</span> |
| <span id="593">593</span> |
| <span id="594">594</span> |
| <span id="595">595</span> |
| </pre><pre class="rust"><code><span class="kw">use </span>std::collections::HashMap; |
| <span class="kw">use </span>std::fs::File; |
| <span class="kw">use </span>std::io::{BufRead, BufReader, Read}; |
| <span class="kw">use </span>std::mem; |
| <span class="kw">use </span>std::path::{Path, PathBuf}; |
| <span class="kw">use </span>std::sync::atomic::{AtomicUsize, Ordering}; |
| <span class="kw">use </span>std::sync::Once; |
| |
| <span class="kw">use </span>libc; |
| |
| <span class="macro">macro_rules! </span>debug { |
| ($(<span class="macro-nonterminal">$args</span>:expr),<span class="kw-2">*</span>) => ({ |
| <span class="kw">if </span><span class="bool-val">false </span>{ |
| <span class="comment">//if true { |
| </span><span class="macro">println!</span>($(<span class="macro-nonterminal">$args</span>),<span class="kw-2">*</span>); |
| } |
| }); |
| } |
| |
| <span class="macro">macro_rules! </span>some { |
| (<span class="macro-nonterminal">$e</span>:expr) => {{ |
| <span class="kw">match </span><span class="macro-nonterminal">$e </span>{ |
| <span class="prelude-val">Some</span>(v) => v, |
| <span class="prelude-val">None </span>=> { |
| <span class="macro">debug!</span>(<span class="string">"NONE: {:?}"</span>, <span class="macro">stringify!</span>(<span class="macro-nonterminal">$e</span>)); |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| } |
| }}; |
| } |
| |
| <span class="kw">pub fn </span>get_num_cpus() -> usize { |
| <span class="kw">match </span>cgroups_num_cpus() { |
| <span class="prelude-val">Some</span>(n) => n, |
| <span class="prelude-val">None </span>=> logical_cpus(), |
| } |
| } |
| |
| <span class="kw">fn </span>logical_cpus() -> usize { |
| <span class="kw">let </span><span class="kw-2">mut </span>set: libc::cpu_set_t = <span class="kw">unsafe </span>{ mem::zeroed() }; |
| <span class="kw">if unsafe </span>{ libc::sched_getaffinity(<span class="number">0</span>, mem::size_of::<libc::cpu_set_t>(), <span class="kw-2">&mut </span>set) } == <span class="number">0 </span>{ |
| <span class="kw">let </span><span class="kw-2">mut </span>count: u32 = <span class="number">0</span>; |
| <span class="kw">for </span>i <span class="kw">in </span><span class="number">0</span>..libc::CPU_SETSIZE <span class="kw">as </span>usize { |
| <span class="kw">if unsafe </span>{ libc::CPU_ISSET(i, <span class="kw-2">&</span>set) } { |
| count += <span class="number">1 |
| </span>} |
| } |
| count <span class="kw">as </span>usize |
| } <span class="kw">else </span>{ |
| <span class="kw">let </span>cpus = <span class="kw">unsafe </span>{ libc::sysconf(libc::_SC_NPROCESSORS_ONLN) }; |
| <span class="kw">if </span>cpus < <span class="number">1 </span>{ |
| <span class="number">1 |
| </span>} <span class="kw">else </span>{ |
| cpus <span class="kw">as </span>usize |
| } |
| } |
| } |
| |
| <span class="kw">pub fn </span>get_num_physical_cpus() -> usize { |
| <span class="kw">let </span>file = <span class="kw">match </span>File::open(<span class="string">"/proc/cpuinfo"</span>) { |
| <span class="prelude-val">Ok</span>(val) => val, |
| <span class="prelude-val">Err</span>(<span class="kw">_</span>) => <span class="kw">return </span>get_num_cpus(), |
| }; |
| <span class="kw">let </span>reader = BufReader::new(file); |
| <span class="kw">let </span><span class="kw-2">mut </span>map = HashMap::new(); |
| <span class="kw">let </span><span class="kw-2">mut </span>physid: u32 = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>cores: usize = <span class="number">0</span>; |
| <span class="kw">let </span><span class="kw-2">mut </span>chgcount = <span class="number">0</span>; |
| <span class="kw">for </span>line <span class="kw">in </span>reader.lines().filter_map(|result| result.ok()) { |
| <span class="kw">let </span><span class="kw-2">mut </span>it = line.split(<span class="string">':'</span>); |
| <span class="kw">let </span>(key, value) = <span class="kw">match </span>(it.next(), it.next()) { |
| (<span class="prelude-val">Some</span>(key), <span class="prelude-val">Some</span>(value)) => (key.trim(), value.trim()), |
| <span class="kw">_ </span>=> <span class="kw">continue</span>, |
| }; |
| <span class="kw">if </span>key == <span class="string">"physical id" </span>{ |
| <span class="kw">match </span>value.parse() { |
| <span class="prelude-val">Ok</span>(val) => physid = val, |
| <span class="prelude-val">Err</span>(<span class="kw">_</span>) => <span class="kw">break</span>, |
| }; |
| chgcount += <span class="number">1</span>; |
| } |
| <span class="kw">if </span>key == <span class="string">"cpu cores" </span>{ |
| <span class="kw">match </span>value.parse() { |
| <span class="prelude-val">Ok</span>(val) => cores = val, |
| <span class="prelude-val">Err</span>(<span class="kw">_</span>) => <span class="kw">break</span>, |
| }; |
| chgcount += <span class="number">1</span>; |
| } |
| <span class="kw">if </span>chgcount == <span class="number">2 </span>{ |
| map.insert(physid, cores); |
| chgcount = <span class="number">0</span>; |
| } |
| } |
| <span class="kw">let </span>count = map.into_iter().fold(<span class="number">0</span>, |acc, (<span class="kw">_</span>, cores)| acc + cores); |
| |
| <span class="kw">if </span>count == <span class="number">0 </span>{ |
| get_num_cpus() |
| } <span class="kw">else </span>{ |
| count |
| } |
| } |
| |
| <span class="doccomment">/// Cached CPUs calculated from cgroups. |
| /// |
| /// If 0, check logical cpus. |
| </span><span class="comment">// Allow deprecation warnings, we want to work on older rustc |
| </span><span class="attribute">#[allow(warnings)] |
| </span><span class="kw">static </span>CGROUPS_CPUS: AtomicUsize = ::std::sync::atomic::ATOMIC_USIZE_INIT; |
| |
| <span class="kw">fn </span>cgroups_num_cpus() -> <span class="prelude-ty">Option</span><usize> { |
| <span class="attribute">#[allow(warnings)] |
| </span><span class="kw">static </span>ONCE: Once = ::std::sync::ONCE_INIT; |
| |
| ONCE.call_once(init_cgroups); |
| |
| <span class="kw">let </span>cpus = CGROUPS_CPUS.load(Ordering::Acquire); |
| |
| <span class="kw">if </span>cpus > <span class="number">0 </span>{ |
| <span class="prelude-val">Some</span>(cpus) |
| } <span class="kw">else </span>{ |
| <span class="prelude-val">None |
| </span>} |
| } |
| |
| <span class="kw">fn </span>init_cgroups() { |
| <span class="comment">// Should only be called once |
| </span><span class="macro">debug_assert!</span>(CGROUPS_CPUS.load(Ordering::SeqCst) == <span class="number">0</span>); |
| |
| <span class="comment">// Fails in Miri by default (cannot open files), and Miri does not have parallelism anyway. |
| </span><span class="kw">if </span><span class="macro">cfg!</span>(miri) { |
| <span class="kw">return</span>; |
| } |
| |
| <span class="kw">if let </span><span class="prelude-val">Some</span>(quota) = load_cgroups(<span class="string">"/proc/self/cgroup"</span>, <span class="string">"/proc/self/mountinfo"</span>) { |
| <span class="kw">if </span>quota == <span class="number">0 </span>{ |
| <span class="kw">return</span>; |
| } |
| |
| <span class="kw">let </span>logical = logical_cpus(); |
| <span class="kw">let </span>count = ::std::cmp::min(quota, logical); |
| |
| CGROUPS_CPUS.store(count, Ordering::SeqCst); |
| } |
| } |
| |
| <span class="kw">fn </span>load_cgroups<P1, P2>(cgroup_proc: P1, mountinfo_proc: P2) -> <span class="prelude-ty">Option</span><usize> |
| <span class="kw">where |
| </span>P1: AsRef<Path>, |
| P2: AsRef<Path>, |
| { |
| <span class="kw">let </span>subsys = <span class="macro">some!</span>(Subsys::load_cpu(cgroup_proc)); |
| <span class="kw">let </span>mntinfo = <span class="macro">some!</span>(MountInfo::load_cpu(mountinfo_proc, subsys.version)); |
| <span class="kw">let </span>cgroup = <span class="macro">some!</span>(Cgroup::translate(mntinfo, subsys)); |
| cgroup.cpu_quota() |
| } |
| |
| <span class="attribute">#[derive(Debug, Clone, Copy, PartialEq, Eq)] |
| </span><span class="kw">enum </span>CgroupVersion { |
| V1, |
| V2, |
| } |
| |
| <span class="kw">struct </span>Cgroup { |
| version: CgroupVersion, |
| base: PathBuf, |
| } |
| |
| <span class="kw">struct </span>MountInfo { |
| version: CgroupVersion, |
| root: String, |
| mount_point: String, |
| } |
| |
| <span class="kw">struct </span>Subsys { |
| version: CgroupVersion, |
| base: String, |
| } |
| |
| <span class="kw">impl </span>Cgroup { |
| <span class="kw">fn </span>new(version: CgroupVersion, dir: PathBuf) -> Cgroup { |
| Cgroup { version: version, base: dir } |
| } |
| |
| <span class="kw">fn </span>translate(mntinfo: MountInfo, subsys: Subsys) -> <span class="prelude-ty">Option</span><Cgroup> { |
| <span class="comment">// Translate the subsystem directory via the host paths. |
| </span><span class="macro">debug!</span>( |
| <span class="string">"subsys = {:?}; root = {:?}; mount_point = {:?}"</span>, |
| subsys.base, mntinfo.root, mntinfo.mount_point |
| ); |
| |
| <span class="kw">let </span>rel_from_root = <span class="macro">some!</span>(Path::new(<span class="kw-2">&</span>subsys.base).strip_prefix(<span class="kw-2">&</span>mntinfo.root).ok()); |
| |
| <span class="macro">debug!</span>(<span class="string">"rel_from_root: {:?}"</span>, rel_from_root); |
| |
| <span class="comment">// join(mp.MountPoint, relPath) |
| </span><span class="kw">let </span><span class="kw-2">mut </span>path = PathBuf::from(mntinfo.mount_point); |
| path.push(rel_from_root); |
| <span class="prelude-val">Some</span>(Cgroup::new(mntinfo.version, path)) |
| } |
| |
| <span class="kw">fn </span>cpu_quota(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">let </span>(quota_us, period_us) = <span class="kw">match </span><span class="self">self</span>.version { |
| CgroupVersion::V1 => (<span class="macro">some!</span>(<span class="self">self</span>.quota_us()), <span class="macro">some!</span>(<span class="self">self</span>.period_us())), |
| CgroupVersion::V2 => <span class="macro">some!</span>(<span class="self">self</span>.max()), |
| }; |
| |
| <span class="comment">// protect against dividing by zero |
| </span><span class="kw">if </span>period_us == <span class="number">0 </span>{ |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| <span class="comment">// Ceil the division, since we want to be able to saturate |
| // the available CPUs, and flooring would leave a CPU un-utilized. |
| |
| </span><span class="prelude-val">Some</span>((quota_us <span class="kw">as </span>f64 / period_us <span class="kw">as </span>f64).ceil() <span class="kw">as </span>usize) |
| } |
| |
| <span class="kw">fn </span>quota_us(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="self">self</span>.param(<span class="string">"cpu.cfs_quota_us"</span>) |
| } |
| |
| <span class="kw">fn </span>period_us(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="self">self</span>.param(<span class="string">"cpu.cfs_period_us"</span>) |
| } |
| |
| <span class="kw">fn </span>max(<span class="kw-2">&</span><span class="self">self</span>) -> <span class="prelude-ty">Option</span><(usize, usize)> { |
| <span class="kw">let </span>max = <span class="macro">some!</span>(<span class="self">self</span>.raw_param(<span class="string">"cpu.max"</span>)); |
| <span class="kw">let </span><span class="kw-2">mut </span>max = <span class="macro">some!</span>(max.lines().next()).split(<span class="string">' '</span>); |
| |
| <span class="kw">let </span>quota = <span class="macro">some!</span>(max.next().and_then(|quota| quota.parse().ok())); |
| <span class="kw">let </span>period = <span class="macro">some!</span>(max.next().and_then(|period| period.parse().ok())); |
| |
| <span class="prelude-val">Some</span>((quota, period)) |
| } |
| |
| <span class="kw">fn </span>param(<span class="kw-2">&</span><span class="self">self</span>, param: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Option</span><usize> { |
| <span class="kw">let </span>buf = <span class="macro">some!</span>(<span class="self">self</span>.raw_param(param)); |
| |
| buf.trim().parse().ok() |
| } |
| |
| <span class="kw">fn </span>raw_param(<span class="kw-2">&</span><span class="self">self</span>, param: <span class="kw-2">&</span>str) -> <span class="prelude-ty">Option</span><String> { |
| <span class="kw">let </span><span class="kw-2">mut </span>file = <span class="macro">some!</span>(File::open(<span class="self">self</span>.base.join(param)).ok()); |
| |
| <span class="kw">let </span><span class="kw-2">mut </span>buf = String::new(); |
| <span class="macro">some!</span>(file.read_to_string(<span class="kw-2">&mut </span>buf).ok()); |
| |
| <span class="prelude-val">Some</span>(buf) |
| } |
| } |
| |
| <span class="kw">impl </span>MountInfo { |
| <span class="kw">fn </span>load_cpu<P: AsRef<Path>>(proc_path: P, version: CgroupVersion) -> <span class="prelude-ty">Option</span><MountInfo> { |
| <span class="kw">let </span>file = <span class="macro">some!</span>(File::open(proc_path).ok()); |
| <span class="kw">let </span>file = BufReader::new(file); |
| |
| file.lines() |
| .filter_map(|result| result.ok()) |
| .filter_map(MountInfo::parse_line) |
| .find(|mount_info| mount_info.version == version) |
| } |
| |
| <span class="kw">fn </span>parse_line(line: String) -> <span class="prelude-ty">Option</span><MountInfo> { |
| <span class="kw">let </span><span class="kw-2">mut </span>fields = line.split(<span class="string">' '</span>); |
| |
| <span class="comment">// 7 5 0:6 </> /sys/fs/cgroup/cpu,cpuacct rw,nosuid,nodev,noexec,relatime shared:7 - cgroup cgroup rw,cpu,cpuacct |
| </span><span class="kw">let </span>mnt_root = <span class="macro">some!</span>(fields.nth(<span class="number">3</span>)); |
| <span class="comment">// 7 5 0:6 / </sys/fs/cgroup/cpu,cpuacct> rw,nosuid,nodev,noexec,relatime shared:7 - cgroup cgroup rw,cpu,cpuacct |
| </span><span class="kw">let </span>mnt_point = <span class="macro">some!</span>(fields.next()); |
| |
| <span class="comment">// Ignore all fields until the separator(-). |
| // Note: there could be zero or more optional fields before hyphen. |
| // See: https://man7.org/linux/man-pages/man5/proc.5.html |
| // 7 5 0:6 / /sys/fs/cgroup/cpu,cpuacct rw,nosuid,nodev,noexec,relatime shared:7 <-> cgroup cgroup rw,cpu,cpuacct |
| // Note: we cannot use `?` here because we need to support Rust 1.13. |
| </span><span class="kw">match </span>fields.find(|<span class="kw-2">&</span>s| s == <span class="string">"-"</span>) { |
| <span class="prelude-val">Some</span>(<span class="kw">_</span>) => {} |
| <span class="prelude-val">None </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| }; |
| |
| <span class="comment">// 7 5 0:6 / /sys/fs/cgroup/cpu,cpuacct rw,nosuid,nodev,noexec,relatime shared:7 - <cgroup> cgroup rw,cpu,cpuacct |
| </span><span class="kw">let </span>version = <span class="kw">match </span>fields.next() { |
| <span class="prelude-val">Some</span>(<span class="string">"cgroup"</span>) => CgroupVersion::V1, |
| <span class="prelude-val">Some</span>(<span class="string">"cgroup2"</span>) => CgroupVersion::V2, |
| <span class="kw">_ </span>=> <span class="kw">return </span><span class="prelude-val">None</span>, |
| }; |
| |
| <span class="comment">// cgroups2 only has a single mount point |
| </span><span class="kw">if </span>version == CgroupVersion::V1 { |
| <span class="comment">// 7 5 0:6 / /sys/fs/cgroup/cpu,cpuacct rw,nosuid,nodev,noexec,relatime shared:7 - cgroup cgroup <rw,cpu,cpuacct> |
| </span><span class="kw">let </span>super_opts = <span class="macro">some!</span>(fields.nth(<span class="number">1</span>)); |
| |
| <span class="comment">// We only care about the 'cpu' option |
| </span><span class="kw">if </span>!super_opts.split(<span class="string">','</span>).any(|opt| opt == <span class="string">"cpu"</span>) { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| } |
| |
| <span class="prelude-val">Some</span>(MountInfo { |
| version: version, |
| root: mnt_root.to_owned(), |
| mount_point: mnt_point.to_owned(), |
| }) |
| } |
| } |
| |
| <span class="kw">impl </span>Subsys { |
| <span class="kw">fn </span>load_cpu<P: AsRef<Path>>(proc_path: P) -> <span class="prelude-ty">Option</span><Subsys> { |
| <span class="kw">let </span>file = <span class="macro">some!</span>(File::open(proc_path).ok()); |
| <span class="kw">let </span>file = BufReader::new(file); |
| |
| file.lines() |
| .filter_map(|result| result.ok()) |
| .filter_map(Subsys::parse_line) |
| .fold(<span class="prelude-val">None</span>, |previous, line| { |
| <span class="comment">// already-found v1 trumps v2 since it explicitly specifies its controllers |
| </span><span class="kw">if </span>previous.is_some() && line.version == CgroupVersion::V2 { |
| <span class="kw">return </span>previous; |
| } |
| |
| <span class="prelude-val">Some</span>(line) |
| }) |
| } |
| |
| <span class="kw">fn </span>parse_line(line: String) -> <span class="prelude-ty">Option</span><Subsys> { |
| <span class="comment">// Example format: |
| // 11:cpu,cpuacct:/ |
| </span><span class="kw">let </span><span class="kw-2">mut </span>fields = line.split(<span class="string">':'</span>); |
| |
| <span class="kw">let </span>sub_systems = <span class="macro">some!</span>(fields.nth(<span class="number">1</span>)); |
| |
| <span class="kw">let </span>version = <span class="kw">if </span>sub_systems.is_empty() { |
| CgroupVersion::V2 |
| } <span class="kw">else </span>{ |
| CgroupVersion::V1 |
| }; |
| |
| <span class="kw">if </span>version == CgroupVersion::V1 && !sub_systems.split(<span class="string">','</span>).any(|sub| sub == <span class="string">"cpu"</span>) { |
| <span class="kw">return </span><span class="prelude-val">None</span>; |
| } |
| |
| fields.next().map(|path| Subsys { |
| version: version, |
| base: path.to_owned(), |
| }) |
| } |
| } |
| |
| <span class="attribute">#[cfg(test)] |
| </span><span class="kw">mod </span>tests { |
| <span class="kw">mod </span>v1 { |
| <span class="kw">use </span><span class="kw">super</span>::<span class="kw">super</span>::{Cgroup, CgroupVersion, MountInfo, Subsys}; |
| <span class="kw">use </span>std::path::{Path, PathBuf}; |
| |
| <span class="comment">// `static_in_const` feature is not stable in Rust 1.13. |
| </span><span class="kw">static </span>FIXTURES_PROC: <span class="kw-2">&</span><span class="lifetime">'static </span>str = <span class="string">"fixtures/cgroups/proc/cgroups"</span>; |
| |
| <span class="kw">static </span>FIXTURES_CGROUPS: <span class="kw-2">&</span><span class="lifetime">'static </span>str = <span class="string">"fixtures/cgroups/cgroups"</span>; |
| |
| <span class="macro">macro_rules! </span>join { |
| (<span class="macro-nonterminal">$base</span>:expr, $(<span class="macro-nonterminal">$path</span>:expr),+) => ({ |
| Path::new(<span class="macro-nonterminal">$base</span>) |
| $(.join(<span class="macro-nonterminal">$path</span>))+ |
| }) |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_load_mountinfo() { |
| <span class="comment">// test only one optional fields |
| </span><span class="kw">let </span>path = <span class="macro">join!</span>(FIXTURES_PROC, <span class="string">"mountinfo"</span>); |
| |
| <span class="kw">let </span>mnt_info = MountInfo::load_cpu(path, CgroupVersion::V1).unwrap(); |
| |
| <span class="macro">assert_eq!</span>(mnt_info.root, <span class="string">"/"</span>); |
| <span class="macro">assert_eq!</span>(mnt_info.mount_point, <span class="string">"/sys/fs/cgroup/cpu,cpuacct"</span>); |
| |
| <span class="comment">// test zero optional field |
| </span><span class="kw">let </span>path = <span class="macro">join!</span>(FIXTURES_PROC, <span class="string">"mountinfo_zero_opt"</span>); |
| |
| <span class="kw">let </span>mnt_info = MountInfo::load_cpu(path, CgroupVersion::V1).unwrap(); |
| |
| <span class="macro">assert_eq!</span>(mnt_info.root, <span class="string">"/"</span>); |
| <span class="macro">assert_eq!</span>(mnt_info.mount_point, <span class="string">"/sys/fs/cgroup/cpu,cpuacct"</span>); |
| |
| <span class="comment">// test multi optional fields |
| </span><span class="kw">let </span>path = <span class="macro">join!</span>(FIXTURES_PROC, <span class="string">"mountinfo_multi_opt"</span>); |
| |
| <span class="kw">let </span>mnt_info = MountInfo::load_cpu(path, CgroupVersion::V1).unwrap(); |
| |
| <span class="macro">assert_eq!</span>(mnt_info.root, <span class="string">"/"</span>); |
| <span class="macro">assert_eq!</span>(mnt_info.mount_point, <span class="string">"/sys/fs/cgroup/cpu,cpuacct"</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_load_subsys() { |
| <span class="kw">let </span>path = <span class="macro">join!</span>(FIXTURES_PROC, <span class="string">"cgroup"</span>); |
| |
| <span class="kw">let </span>subsys = Subsys::load_cpu(path).unwrap(); |
| |
| <span class="macro">assert_eq!</span>(subsys.base, <span class="string">"/"</span>); |
| <span class="macro">assert_eq!</span>(subsys.version, CgroupVersion::V1); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_cgroup_mount() { |
| <span class="kw">let </span>cases = <span class="kw-2">&</span>[ |
| (<span class="string">"/"</span>, <span class="string">"/sys/fs/cgroup/cpu"</span>, <span class="string">"/"</span>, <span class="prelude-val">Some</span>(<span class="string">"/sys/fs/cgroup/cpu"</span>)), |
| ( |
| <span class="string">"/docker/01abcd"</span>, |
| <span class="string">"/sys/fs/cgroup/cpu"</span>, |
| <span class="string">"/docker/01abcd"</span>, |
| <span class="prelude-val">Some</span>(<span class="string">"/sys/fs/cgroup/cpu"</span>), |
| ), |
| ( |
| <span class="string">"/docker/01abcd"</span>, |
| <span class="string">"/sys/fs/cgroup/cpu"</span>, |
| <span class="string">"/docker/01abcd/"</span>, |
| <span class="prelude-val">Some</span>(<span class="string">"/sys/fs/cgroup/cpu"</span>), |
| ), |
| ( |
| <span class="string">"/docker/01abcd"</span>, |
| <span class="string">"/sys/fs/cgroup/cpu"</span>, |
| <span class="string">"/docker/01abcd/large"</span>, |
| <span class="prelude-val">Some</span>(<span class="string">"/sys/fs/cgroup/cpu/large"</span>), |
| ), |
| <span class="comment">// fails |
| </span>(<span class="string">"/docker/01abcd"</span>, <span class="string">"/sys/fs/cgroup/cpu"</span>, <span class="string">"/"</span>, <span class="prelude-val">None</span>), |
| (<span class="string">"/docker/01abcd"</span>, <span class="string">"/sys/fs/cgroup/cpu"</span>, <span class="string">"/docker"</span>, <span class="prelude-val">None</span>), |
| (<span class="string">"/docker/01abcd"</span>, <span class="string">"/sys/fs/cgroup/cpu"</span>, <span class="string">"/elsewhere"</span>, <span class="prelude-val">None</span>), |
| ( |
| <span class="string">"/docker/01abcd"</span>, |
| <span class="string">"/sys/fs/cgroup/cpu"</span>, |
| <span class="string">"/docker/01abcd-other-dir"</span>, |
| <span class="prelude-val">None</span>, |
| ), |
| ]; |
| |
| <span class="kw">for </span><span class="kw-2">&</span>(root, mount_point, subsys, expected) <span class="kw">in </span>cases.iter() { |
| <span class="kw">let </span>mnt_info = MountInfo { |
| version: CgroupVersion::V1, |
| root: root.into(), |
| mount_point: mount_point.into(), |
| }; |
| <span class="kw">let </span>subsys = Subsys { |
| version: CgroupVersion::V1, |
| base: subsys.into(), |
| }; |
| |
| <span class="kw">let </span>actual = Cgroup::translate(mnt_info, subsys).map(|c| c.base); |
| <span class="kw">let </span>expected = expected.map(PathBuf::from); |
| <span class="macro">assert_eq!</span>(actual, expected); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_cgroup_cpu_quota() { |
| <span class="kw">let </span>cgroup = Cgroup::new(CgroupVersion::V1, <span class="macro">join!</span>(FIXTURES_CGROUPS, <span class="string">"good"</span>)); |
| <span class="macro">assert_eq!</span>(cgroup.cpu_quota(), <span class="prelude-val">Some</span>(<span class="number">6</span>)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_cgroup_cpu_quota_divide_by_zero() { |
| <span class="kw">let </span>cgroup = Cgroup::new(CgroupVersion::V1, <span class="macro">join!</span>(FIXTURES_CGROUPS, <span class="string">"zero-period"</span>)); |
| <span class="macro">assert!</span>(cgroup.quota_us().is_some()); |
| <span class="macro">assert_eq!</span>(cgroup.period_us(), <span class="prelude-val">Some</span>(<span class="number">0</span>)); |
| <span class="macro">assert_eq!</span>(cgroup.cpu_quota(), <span class="prelude-val">None</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_cgroup_cpu_quota_ceil() { |
| <span class="kw">let </span>cgroup = Cgroup::new(CgroupVersion::V1, <span class="macro">join!</span>(FIXTURES_CGROUPS, <span class="string">"ceil"</span>)); |
| <span class="macro">assert_eq!</span>(cgroup.cpu_quota(), <span class="prelude-val">Some</span>(<span class="number">2</span>)); |
| } |
| } |
| |
| <span class="kw">mod </span>v2 { |
| <span class="kw">use </span><span class="kw">super</span>::<span class="kw">super</span>::{Cgroup, CgroupVersion, MountInfo, Subsys}; |
| <span class="kw">use </span>std::path::{Path, PathBuf}; |
| |
| <span class="comment">// `static_in_const` feature is not stable in Rust 1.13. |
| </span><span class="kw">static </span>FIXTURES_PROC: <span class="kw-2">&</span><span class="lifetime">'static </span>str = <span class="string">"fixtures/cgroups2/proc/cgroups"</span>; |
| |
| <span class="kw">static </span>FIXTURES_CGROUPS: <span class="kw-2">&</span><span class="lifetime">'static </span>str = <span class="string">"fixtures/cgroups2/cgroups"</span>; |
| |
| <span class="macro">macro_rules! </span>join { |
| (<span class="macro-nonterminal">$base</span>:expr, $(<span class="macro-nonterminal">$path</span>:expr),+) => ({ |
| Path::new(<span class="macro-nonterminal">$base</span>) |
| $(.join(<span class="macro-nonterminal">$path</span>))+ |
| }) |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_load_mountinfo() { |
| <span class="comment">// test only one optional fields |
| </span><span class="kw">let </span>path = <span class="macro">join!</span>(FIXTURES_PROC, <span class="string">"mountinfo"</span>); |
| |
| <span class="kw">let </span>mnt_info = MountInfo::load_cpu(path, CgroupVersion::V2).unwrap(); |
| |
| <span class="macro">assert_eq!</span>(mnt_info.root, <span class="string">"/"</span>); |
| <span class="macro">assert_eq!</span>(mnt_info.mount_point, <span class="string">"/sys/fs/cgroup"</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_load_subsys() { |
| <span class="kw">let </span>path = <span class="macro">join!</span>(FIXTURES_PROC, <span class="string">"cgroup"</span>); |
| |
| <span class="kw">let </span>subsys = Subsys::load_cpu(path).unwrap(); |
| |
| <span class="macro">assert_eq!</span>(subsys.base, <span class="string">"/"</span>); |
| <span class="macro">assert_eq!</span>(subsys.version, CgroupVersion::V2); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_load_subsys_multi() { |
| <span class="kw">let </span>path = <span class="macro">join!</span>(FIXTURES_PROC, <span class="string">"cgroup_multi"</span>); |
| |
| <span class="kw">let </span>subsys = Subsys::load_cpu(path).unwrap(); |
| |
| <span class="macro">assert_eq!</span>(subsys.base, <span class="string">"/"</span>); |
| <span class="macro">assert_eq!</span>(subsys.version, CgroupVersion::V1); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_cgroup_mount() { |
| <span class="kw">let </span>cases = <span class="kw-2">&</span>[ |
| (<span class="string">"/"</span>, <span class="string">"/sys/fs/cgroup/cpu"</span>, <span class="string">"/"</span>, <span class="prelude-val">Some</span>(<span class="string">"/sys/fs/cgroup/cpu"</span>)), |
| ( |
| <span class="string">"/docker/01abcd"</span>, |
| <span class="string">"/sys/fs/cgroup/cpu"</span>, |
| <span class="string">"/docker/01abcd"</span>, |
| <span class="prelude-val">Some</span>(<span class="string">"/sys/fs/cgroup/cpu"</span>), |
| ), |
| ( |
| <span class="string">"/docker/01abcd"</span>, |
| <span class="string">"/sys/fs/cgroup/cpu"</span>, |
| <span class="string">"/docker/01abcd/"</span>, |
| <span class="prelude-val">Some</span>(<span class="string">"/sys/fs/cgroup/cpu"</span>), |
| ), |
| ( |
| <span class="string">"/docker/01abcd"</span>, |
| <span class="string">"/sys/fs/cgroup/cpu"</span>, |
| <span class="string">"/docker/01abcd/large"</span>, |
| <span class="prelude-val">Some</span>(<span class="string">"/sys/fs/cgroup/cpu/large"</span>), |
| ), |
| <span class="comment">// fails |
| </span>(<span class="string">"/docker/01abcd"</span>, <span class="string">"/sys/fs/cgroup/cpu"</span>, <span class="string">"/"</span>, <span class="prelude-val">None</span>), |
| (<span class="string">"/docker/01abcd"</span>, <span class="string">"/sys/fs/cgroup/cpu"</span>, <span class="string">"/docker"</span>, <span class="prelude-val">None</span>), |
| (<span class="string">"/docker/01abcd"</span>, <span class="string">"/sys/fs/cgroup/cpu"</span>, <span class="string">"/elsewhere"</span>, <span class="prelude-val">None</span>), |
| ( |
| <span class="string">"/docker/01abcd"</span>, |
| <span class="string">"/sys/fs/cgroup/cpu"</span>, |
| <span class="string">"/docker/01abcd-other-dir"</span>, |
| <span class="prelude-val">None</span>, |
| ), |
| ]; |
| |
| <span class="kw">for </span><span class="kw-2">&</span>(root, mount_point, subsys, expected) <span class="kw">in </span>cases.iter() { |
| <span class="kw">let </span>mnt_info = MountInfo { |
| version: CgroupVersion::V1, |
| root: root.into(), |
| mount_point: mount_point.into(), |
| }; |
| <span class="kw">let </span>subsys = Subsys { |
| version: CgroupVersion::V1, |
| base: subsys.into(), |
| }; |
| |
| <span class="kw">let </span>actual = Cgroup::translate(mnt_info, subsys).map(|c| c.base); |
| <span class="kw">let </span>expected = expected.map(PathBuf::from); |
| <span class="macro">assert_eq!</span>(actual, expected); |
| } |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_cgroup_cpu_quota() { |
| <span class="kw">let </span>cgroup = Cgroup::new(CgroupVersion::V2, <span class="macro">join!</span>(FIXTURES_CGROUPS, <span class="string">"good"</span>)); |
| <span class="macro">assert_eq!</span>(cgroup.cpu_quota(), <span class="prelude-val">Some</span>(<span class="number">6</span>)); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_cgroup_cpu_quota_divide_by_zero() { |
| <span class="kw">let </span>cgroup = Cgroup::new(CgroupVersion::V2, <span class="macro">join!</span>(FIXTURES_CGROUPS, <span class="string">"zero-period"</span>)); |
| <span class="kw">let </span>period = cgroup.max().map(|max| max.<span class="number">1</span>); |
| |
| <span class="macro">assert_eq!</span>(period, <span class="prelude-val">Some</span>(<span class="number">0</span>)); |
| <span class="macro">assert_eq!</span>(cgroup.cpu_quota(), <span class="prelude-val">None</span>); |
| } |
| |
| <span class="attribute">#[test] |
| </span><span class="kw">fn </span>test_cgroup_cpu_quota_ceil() { |
| <span class="kw">let </span>cgroup = Cgroup::new(CgroupVersion::V2, <span class="macro">join!</span>(FIXTURES_CGROUPS, <span class="string">"ceil"</span>)); |
| <span class="macro">assert_eq!</span>(cgroup.cpu_quota(), <span class="prelude-val">Some</span>(<span class="number">2</span>)); |
| } |
| } |
| } |
| </code></pre></div> |
| </section></div></main><div id="rustdoc-vars" data-root-path="../../" data-current-crate="num_cpus" data-themes="ayu,dark,light" data-resource-suffix="" data-rustdoc-version="1.66.0-nightly (5c8bff74b 2022-10-21)" ></div></body></html> |
