Add hugetop command

Cargo.toml

@@ -33,6 +33,7 @@ uudoc = []
 
 feat_common_core = [
     "free",
+    "hugetop",
     "pgrep",
     "pidof",
     "pidwait",
@@ -92,6 +93,7 @@ uucore = { workspace = true }
 
 #
 free = { optional = true, version = "0.0.1", package = "uu_free", path = "src/uu/free" }
+hugetop = {optional = true, version = "0.0.1", package = "uu_hugetop", path = "src/uu/hugetop"}
 pgrep = { optional = true, version = "0.0.1", package = "uu_pgrep", path = "src/uu/pgrep" }
 pidof = { optional = true, version = "0.0.1", package = "uu_pidof", path = "src/uu/pidof" }
 pidwait = { optional = true, version = "0.0.1", package = "uu_pidwait", path = "src/uu/pidwait" }

src/uu/hugetop/Cargo.toml

@@ -0,0 +1,27 @@
+[package]
+name = "uu_hugetop"
+version = "0.0.1"
+edition = "2021"
+authors = ["uutils developers"]
+license = "MIT"
+description = "hugetop ~ (uutils) Report huge page information"
+
+homepage = "https://github.com/uutils/procps"
+repository = "https://github.com/uutils/procps/tree/main/src/uu/hugetop"
+keywords = ["acl", "uutils", "cross-platform", "cli", "utility"]
+categories = ["command-line-utilities"]
+
+[dependencies]
+bytesize = { workspace = true }
+clap = { workspace = true }
+sysinfo = { workspace = true }
+uucore = { workspace = true }
+uu_pmap = { path = "../pmap" }
+uu_top= { path = "../top" }
+
+[lib]
+path = "src/hugetop.rs"
+
+[[bin]]
+name = "hugetop"
+path = "src/main.rs"

src/uu/hugetop/hugetop.md

@@ -0,0 +1,7 @@
+# hugetop
+
+```
+hugetop [options]
+```
+
+Displays huge page information of the system and processes.

src/uu/hugetop/src/hugetop.rs

@@ -0,0 +1,225 @@
+// This file is part of the uutils procps package.
+//
+// For the full copyright and license information, please view the LICENSE
+// file that was distributed with this source code.
+
+use clap::{arg, crate_version, ArgAction, Command};
+use std::env;
+use std::fs;
+use std::io::Error;
+use std::path::Path;
+use std::process;
+use uu_pmap::smaps_format_parser::parse_smap_entries;
+use uu_pmap::smaps_format_parser::SmapEntry;
+use uu_top::header;
+use uucore::uptime::get_formatted_time;
+use uucore::{error::UResult, format_usage, help_about, help_usage};
+
+const ABOUT: &str = help_about!("hugetop.md");
+const USAGE: &str = help_usage!("hugetop.md");
+
+#[derive(Debug)]
+struct ProcessHugepageInfo {
+    pid: u32,
+    name: String,
+    entries: Vec<SmapEntry>,
+}
+
+#[derive(Default, Debug)]
+struct HugePageSizeInfo {
+    size_kb: u64,
+    free: u64,
+    total: u64,
+}
+
+impl std::fmt::Display for HugePageSizeInfo {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        let size_str = match self.size_kb {
+            2048 => "2Mi",
+            1048576 => "1Gi",
+            _ => panic!("{}", self.size_kb),
+        };
+
+        write!(f, "{} - {}/{}", size_str, self.free, self.total)
+    }
+}
+
+fn parse_hugepage() -> Result<Vec<HugePageSizeInfo>, Error> {
+    let parse_hugepage_value = |p: &Path| -> Result<u64, Error> {
+        fs::read_to_string(p)?.trim().parse().map_err(|_| {
+            std::io::Error::new(
+                std::io::ErrorKind::InvalidData,
+                "Invalid memory info format",
+            )
+        })
+    };
+
+    let info_dir = fs::read_dir("/sys/kernel/mm/hugepages")?;
+
+    let mut sizes = Vec::new();
+
+    for entry in info_dir {
+        let entry = entry?;
+
+        let mut info = HugePageSizeInfo::default();
+
+        info.total = parse_hugepage_value(&entry.path().join("nr_hugepages"))?;
+        info.free = parse_hugepage_value(&entry.path().join("free_hugepages"))?;
+        info.size_kb = entry
+            .file_name()
+            .into_string()
+            .unwrap()
+            .split("-")
+            .nth(1)
+            .unwrap()
+            .replace("kB", "")
+            .parse()
+            .map_err(|_| {
+                std::io::Error::new(
+                    std::io::ErrorKind::InvalidData,
+                    "Invalid memory info format",
+                )
+            })?;
+
+        sizes.push(info);
+    }
+
+    Ok(sizes)
+}
+
+fn parse_process_info(p: &fs::DirEntry) -> Option<ProcessHugepageInfo> {
+    let pid_str = p.file_name().into_string().unwrap_or_default();
+
+    // Skip non-PID directories
+    let pid = pid_str.parse::<u32>().ok()?;
+
+    // Parse name
+    let name = fs::read_to_string(p.path().join("status"))
+        .ok()?
+        .lines()
+        .nth(0)
+        .unwrap_or_default()
+        .split(":")
+        .nth(1)
+        .unwrap_or_default()
+        .trim()
+        .to_string();
+
+    let contents = fs::read_to_string(p.path().join("smaps")).ok()?;
+    let smap_entries = parse_smap_entries(&contents).ok()?;
+    let smap_entries: Vec<_> = smap_entries
+        .into_iter()
+        .filter(|entry| entry.kernel_page_size_in_kb >= 2024)
+        .collect();
+
+    if smap_entries.is_empty() {
+        return None;
+    }
+
+    Some(ProcessHugepageInfo {
+        name,
+        pid,
+        entries: smap_entries,
+    })
+}
+
+#[cfg(target_os = "linux")]
+fn parse_process_hugepages() -> Result<Vec<ProcessHugepageInfo>, Error> {
+    let mut processes = Vec::new();
+    let proc_dir = fs::read_dir("/proc")?;
+
+    for entry in proc_dir {
+        let entry = entry?;
+        if let Some(info) = parse_process_info(&entry) {
+            processes.push(info);
+        }
+    }
+
+    Ok(processes)
+}
+
+#[uucore::main]
+pub fn uumain(args: impl uucore::Args) -> UResult<()> {
+    match parse_hugepage() {
+        Ok(sys_info) => match parse_process_hugepages() {
+            Ok(p_info) => {
+                print!("{}", construct_str(sys_info, &p_info,));
+            }
+            Err(e) => {
+                eprintln!("hugetop: failed to read process hugepage info: {}", e);
+                process::exit(1);
+            }
+        },
+        Err(e) => {
+            eprintln!("hugetop: failed to read hugepage info: {}", e);
+            process::exit(1);
+        }
+    }
+
+    Ok(())
+}
+
+pub fn uu_app() -> Command {
+    Command::new(uucore::util_name())
+        .version(crate_version!())
+        .about(ABOUT)
+        .override_usage(format_usage(USAGE))
+        .args_override_self(true)
+        .infer_long_args(true)
+        .disable_help_flag(true)
+        .arg(arg!(--help "display this help and exit").action(ArgAction::SetTrue))
+}
+
+fn construct_str(sys: Vec<HugePageSizeInfo>, processes: &[ProcessHugepageInfo]) -> String {
+    let mut output = String::new();
+
+    output.push_str(&construct_system_str(sys));
+    output.push_str(&format_process_str(processes));
+
+    output
+}
+
+fn format_process_str(processes: &[ProcessHugepageInfo]) -> String {
+    let mut output = String::new();
+    let header = format!(
+        "{:<8} {:<12} {:<12} {:<12}\n",
+        "PID", "Private", "Shared", "Process"
+    );
+
+    output.push_str(&header);
+
+    for process in processes {
+        for smap_entry in &process.entries {
+            output.push_str(&format!(
+                "{:<8} {:<12} {:<12} {:<12}\n",
+                process.pid,
+                smap_entry.private_hugetlb_in_kb,
+                smap_entry.shared_hugetlb_in_kb,
+                process.name
+            ));
+        }
+    }
+
+    output
+}
+
+fn construct_system_str(sys: Vec<HugePageSizeInfo>) -> String {
+    let mut output = String::new();
+    output.push_str(&format!(
+        "top - {time} {uptime}, {user}\n",
+        time = get_formatted_time(),
+        uptime = header::uptime(),
+        user = header::user(),
+    ));
+
+    for (i, info) in sys.iter().enumerate() {
+        if i < sys.len() - 1 {
+            output.push_str(&format!("{}, ", info.to_string()));
+        } else {
+            output.push_str(&info.to_string());
+            output.push('\n');
+        }
+    }
+
+    output
+}

src/uu/hugetop/src/main.rs

@@ -0,0 +1 @@
+uucore::bin!(uu_hugetop);

src/uu/pmap/src/pmap.rs

@@ -14,8 +14,7 @@ use uucore::error::{set_exit_code, UResult, USimpleError};
 use uucore::{format_usage, help_about, help_usage};
 
 mod maps_format_parser;
-mod pmap_config;
-mod smaps_format_parser;
+pub mod smaps_format_parser;
 
 const ABOUT: &str = help_about!("pmap.md");
 const USAGE: &str = help_usage!("pmap.md");

src/uu/top/src/header.rs

@@ -39,7 +39,7 @@ fn format_memory(memory_b: u64, unit: u64) -> f64 {
 }
 
 #[inline]
-fn uptime() -> String {
+pub fn uptime() -> String {
     get_formatted_uptime_procps().unwrap_or_default()
 }
 
@@ -91,7 +91,7 @@ pub fn get_nusers_systemd() -> uucore::error::UResult<usize> {
 }
 
 // see: https://gitlab.com/procps-ng/procps/-/blob/4740a0efa79cade867cfc7b32955fe0f75bf5173/library/uptime.c#L63-L115
-fn user() -> String {
+pub fn user() -> String {
     #[cfg(target_os = "linux")]
     if let Ok(nusers) = get_nusers_systemd() {
         return uucore::uptime::format_nusers(nusers);

src/uu/top/src/top.rs

@@ -19,7 +19,7 @@ const ABOUT: &str = help_about!("top.md");
 const USAGE: &str = help_usage!("top.md");
 
 mod field;
-mod header;
+pub mod header;
 mod picker;
 
 #[allow(unused)]