treewide: set up Hotpath for benchmarking individual allocations

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I0351e5753996e6d0391fc9e2f329878a6a6a6964

Cargo.toml

@@ -12,12 +12,19 @@ name = "microfetch"
 path = "src/main.rs"
 
 [dependencies]
-libc = "0.2.175"
+hotpath = { optional = true, version = "0.6" }
-nix  = { default-features = false, features = [ "fs", "hostname", "feature" ], version = "0.30.1" }
+libc    = "0.2.175"
+nix     = { default-features = false, features = [ "fs", "hostname", "feature" ], version = "0.30.1" }
 
 [dev-dependencies]
 criterion = "0.7"
 
+[features]
+hotpath                   = [ "dep:hotpath", "hotpath/hotpath" ]
+hotpath-alloc-bytes-total = [ "hotpath/hotpath-alloc-bytes-total" ]
+hotpath-alloc-count-total = [ "hotpath/hotpath-alloc-count-total" ]
+hotpath-off               = [ "hotpath/hotpath-off" ]
+
 [[bench]]
 harness = false
 name    = "benchmark"

src/colors.rs

@@ -43,6 +43,7 @@ pub static COLORS: LazyLock<Colors> = LazyLock::new(|| {
 });
 
 #[must_use]
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
 pub fn print_dots() -> String {
   format!(
     "{}  {}  {}  {}  {}  {}  {}",

src/desktop.rs

@@ -1,4 +1,5 @@
 #[must_use]
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
 pub fn get_desktop_info() -> String {
   // Retrieve the environment variables and handle Result types
   let desktop_env = std::env::var("XDG_CURRENT_DESKTOP");

src/main.rs

@@ -19,6 +19,7 @@ use crate::{
   uptime::get_current,
 };
 
+#[cfg_attr(feature = "hotpath", hotpath::main)]
 fn main() -> Result<(), Box<dyn std::error::Error>> {
   if Some("--version") == std::env::args().nth(1).as_deref() {
     println!("Microfetch {}", env!("CARGO_PKG_VERSION"));
@@ -56,6 +57,7 @@ struct Fields {
   colors:         String,
 }
 
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
 fn print_system_info(
   fields: &Fields,
 ) -> Result<(), Box<dyn std::error::Error>> {

src/release.rs

@@ -6,6 +6,7 @@ use std::{
 use nix::sys::utsname::UtsName;
 
 #[must_use]
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
 pub fn get_system_info(utsname: &UtsName) -> String {
   format!(
     "{} {} ({})",
@@ -15,6 +16,7 @@ pub fn get_system_info(utsname: &UtsName) -> String {
   )
 }
 
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
 pub fn get_os_pretty_name() -> Result<String, io::Error> {
   let file = File::open("/etc/os-release")?;
   let reader = BufReader::new(file);

src/system.rs

@@ -9,6 +9,7 @@ use nix::sys::{statvfs::statvfs, utsname::UtsName};
 use crate::colors::COLORS;
 
 #[must_use]
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
 pub fn get_username_and_hostname(utsname: &UtsName) -> String {
   let username = env::var("USER").unwrap_or_else(|_| "unknown_user".to_owned());
   let hostname = utsname
@@ -26,6 +27,7 @@ pub fn get_username_and_hostname(utsname: &UtsName) -> String {
 }
 
 #[must_use]
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
 pub fn get_shell() -> String {
   let shell_path =
     env::var("SHELL").unwrap_or_else(|_| "unknown_shell".to_owned());
@@ -33,6 +35,7 @@ pub fn get_shell() -> String {
   shell_name.to_owned()
 }
 
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
 pub fn get_root_disk_usage() -> Result<String, io::Error> {
   let vfs = statvfs("/")?;
   let block_size = vfs.block_size() as u64;
@@ -53,7 +56,9 @@ pub fn get_root_disk_usage() -> Result<String, io::Error> {
   ))
 }
 
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
 pub fn get_memory_usage() -> Result<String, io::Error> {
+  #[cfg_attr(feature = "hotpath", hotpath::measure)]
   fn parse_memory_info() -> Result<(f64, f64), io::Error> {
     let mut total_memory_kb = 0.0;
     let mut available_memory_kb = 0.0;

src/uptime.rs

@@ -1,5 +1,6 @@
 use std::{io, mem::MaybeUninit};
 
+#[cfg_attr(feature = "hotpath", hotpath::measure)]
 pub fn get_current() -> Result<String, io::Error> {
   let uptime_seconds = {
     let mut info = MaybeUninit::uninit();