cpu: store EPP and EPB

src/config.rs

@@ -50,7 +50,7 @@ pub struct CpuDelta {
 
 impl CpuDelta {
     pub fn apply(&self) -> anyhow::Result<()> {
-        let cpus = match &self.for_ {
+        let mut cpus = match &self.for_ {
             Some(numbers) => {
                 let mut cpus = Vec::with_capacity(numbers.len());
 
@@ -63,7 +63,7 @@ impl CpuDelta {
             None => cpu::Cpu::all().context("failed to get all CPUs and their information")?,
         };
 
-        for cpu in cpus {
+        for cpu in &mut cpus {
             if let Some(governor) = self.governor.as_ref() {
                 cpu.set_governor(governor)?;
             }
@@ -77,11 +77,11 @@ impl CpuDelta {
             }
 
             if let Some(mhz_minimum) = self.frequency_mhz_minimum {
-                cpu.set_frequency_minimum(mhz_minimum)?;
+                cpu.set_frequency_mhz_minimum(mhz_minimum)?;
             }
 
             if let Some(mhz_maximum) = self.frequency_mhz_maximum {
-                cpu.set_frequency_maximum(mhz_maximum)?;
+                cpu.set_frequency_mhz_maximum(mhz_maximum)?;
             }
         }
 

src/core.rs

@@ -6,17 +6,12 @@ pub struct SystemInfo {
 pub struct CpuCoreInfo {
     // Per-core data
     pub core_id: u32,
-    pub current_frequency_mhz: Option<u32>,
-    pub min_frequency_mhz: Option<u32>,
-    pub max_frequency_mhz: Option<u32>,
     pub usage_percent: Option<f32>,
     pub temperature_celsius: Option<f32>,
 }
 
 pub struct CpuGlobalInfo {
     // System-wide CPU settings
-    pub current_governor: Option<String>,
-    pub available_governors: Vec<String>,
     pub turbo_status: Option<bool>, // true for enabled, false for disabled
     pub epp: Option<String>,        // Energy Performance Preference
     pub epb: Option<String>,        // Energy Performance Bias

src/cpu.rs

@@ -11,6 +11,19 @@ pub struct Cpu {
 
     pub has_cpufreq: bool,
 
+    pub available_governors: Vec<String>,
+    pub governor: Option<String>,
+
+    pub frequency_mhz: Option<u64>,
+    pub frequency_mhz_minimum: Option<u64>,
+    pub frequency_mhz_maximum: Option<u64>,
+
+    pub available_epps: Vec<String>,
+    pub epp: Option<String>,
+
+    pub available_epbs: Vec<String>,
+    pub epb: Option<String>,
+
     pub time_user: u64,
     pub time_nice: u64,
     pub time_system: u64,
@@ -52,6 +65,19 @@ impl Cpu {
             number,
             has_cpufreq: false,
 
+            available_governors: Vec::new(),
+            governor: None,
+
+            frequency_mhz: None,
+            frequency_mhz_minimum: None,
+            frequency_mhz_maximum: None,
+
+            available_epps: Vec::new(),
+            epp: None,
+
+            available_epbs: Vec::new(),
+            epb: None,
+
             time_user: 0,
             time_nice: 0,
             time_system: 0,
@@ -116,6 +142,13 @@ impl Cpu {
 
         self.rescan_times()?;
 
+        if self.has_cpufreq {
+            self.rescan_governor()?;
+            self.rescan_frequency()?;
+            self.rescan_epp()?;
+            self.rescan_epb()?;
+        }
+
         Ok(())
     }
 
@@ -180,25 +213,134 @@ impl Cpu {
         Ok(())
     }
 
-    pub fn get_available_governors(&self) -> Vec<String> {
-        let Self { number, .. } = self;
+    fn rescan_governor(&mut self) -> anyhow::Result<()> {
+        let Self { number, .. } = *self;
 
-        let Some(Ok(content)) = fs::read(format!(
-            "/sys/devices/system/cpu/cpu{number}/cpufreq/scaling_available_governors"
-        )) else {
-            return Vec::new();
+        self.available_governors = 'available_governors: {
+            let Some(Ok(content)) = fs::read(format!(
+                "/sys/devices/system/cpu/cpu{number}/cpufreq/scaling_available_governors"
+            )) else {
+                break 'available_governors Vec::new();
+            };
+
+            content
+                .split_whitespace()
+                .map(ToString::to_string)
+                .collect()
         };
 
-        content
-            .split_whitespace()
-            .map(ToString::to_string)
-            .collect()
+        self.governor = Some(
+            fs::read(format!(
+                "/sys/devices/system/cpu/cpu{number}/cpufreq/scaling_governor"
+            ))
+            .with_context(|| format!("failed to find {self} scaling governor"))?
+            .with_context(|| format!("failed to read {self} scaling governor"))?,
+        );
+
+        Ok(())
     }
 
-    pub fn set_governor(&self, governor: &str) -> anyhow::Result<()> {
+    fn rescan_frequency(&mut self) -> anyhow::Result<()> {
+        let Self { number, .. } = *self;
+
+        let frequency_khz = fs::read_u64(format!(
+            "/sys/devices/system/cpu/cpu{number}/cpufreq/scaling_cur_freq"
+        ))
+        .with_context(|| format!("failed to find {self} frequency"))?
+        .with_context(|| format!("failed to parse {self} frequency"))?;
+        let frequency_khz_minimum = fs::read_u64(format!(
+            "/sys/devices/system/cpu/cpu{number}/cpufreq/scaling_min_freq"
+        ))
+        .with_context(|| format!("failed to find {self} frequency minimum"))?
+        .with_context(|| format!("failed to parse {self} frequency"))?;
+        let frequency_khz_maximum = fs::read_u64(format!(
+            "/sys/devices/system/cpu/cpu{number}/cpufreq/scaling_max_freq"
+        ))
+        .with_context(|| format!("failed to find {self} frequency maximum"))?
+        .with_context(|| format!("failed to parse {self} frequency"))?;
+
+        self.frequency_mhz = Some(frequency_khz / 1000);
+        self.frequency_mhz_minimum = Some(frequency_khz_minimum / 1000);
+        self.frequency_mhz_maximum = Some(frequency_khz_maximum / 1000);
+
+        Ok(())
+    }
+
+    fn rescan_epp(&mut self) -> anyhow::Result<()> {
         let Self { number, .. } = self;
 
-        let governors = self.get_available_governors();
+        self.available_epps = 'available_epps: {
+            let Some(Ok(content)) = fs::read(format!(
+                "/sys/devices/system/cpu/cpu{number}/cpufreq/energy_performance_available_preferences"
+            )) else {
+                break 'available_epps Vec::new();
+            };
+
+            content
+                .split_whitespace()
+                .map(ToString::to_string)
+                .collect()
+        };
+
+        self.epp = Some(
+            fs::read(format!(
+                "/sys/devices/system/cpu/cpu{number}/cpufreq/energy_performance_preference"
+            ))
+            .with_context(|| format!("failed to find {self} EPP"))?
+            .with_context(|| format!("failed to read {self} EPP"))?,
+        );
+
+        Ok(())
+    }
+
+    fn rescan_epb(&mut self) -> anyhow::Result<()> {
+        let Self { number, .. } = self;
+
+        self.available_epbs = if self.has_cpufreq {
+            vec![
+                "1".to_owned(),
+                "2".to_owned(),
+                "3".to_owned(),
+                "4".to_owned(),
+                "5".to_owned(),
+                "6".to_owned(),
+                "7".to_owned(),
+                "8".to_owned(),
+                "9".to_owned(),
+                "10".to_owned(),
+                "11".to_owned(),
+                "12".to_owned(),
+                "13".to_owned(),
+                "14".to_owned(),
+                "15".to_owned(),
+                "performance".to_owned(),
+                "balance-performance".to_owned(),
+                "balance_performance".to_owned(), // Alternative form with underscore.
+                "balance-power".to_owned(),
+                "balance_power".to_owned(), // Alternative form with underscore.
+                "power".to_owned(),
+            ]
+        } else {
+            Vec::new()
+        };
+
+        self.epb = Some(
+            fs::read(format!(
+                "/sys/devices/system/cpu/cpu{number}/cpufreq/energy_performance_bias"
+            ))
+            .with_context(|| format!("failed to find {self} EPB"))?
+            .with_context(|| format!("failed to read {self} EPB"))?,
+        );
+
+        Ok(())
+    }
+
+    pub fn set_governor(&mut self, governor: &str) -> anyhow::Result<()> {
+        let Self {
+            number,
+            available_governors: ref governors,
+            ..
+        } = *self;
 
         if !governors
             .iter()
@@ -218,28 +360,19 @@ impl Cpu {
             format!(
                 "this probably means that {self} doesn't exist or doesn't support changing governors"
             )
-        })
+        })?;
+
+        self.governor = Some(governor.to_owned());
+
+        Ok(())
     }
 
-    pub fn get_available_epps(&self) -> Vec<String> {
-        let Self { number, .. } = self;
-
-        let Some(Ok(content)) = fs::read(format!(
-            "/sys/devices/system/cpu/cpu{number}/cpufreq/energy_performance_available_preferences"
-        )) else {
-            return Vec::new();
-        };
-
-        content
-            .split_whitespace()
-            .map(ToString::to_string)
-            .collect()
-    }
-
-    pub fn set_epp(&self, epp: &str) -> anyhow::Result<()> {
-        let Self { number, .. } = self;
-
-        let epps = self.get_available_epps();
+    pub fn set_epp(&mut self, epp: &str) -> anyhow::Result<()> {
+        let Self {
+            number,
+            available_epps: ref epps,
+            ..
+        } = *self;
 
         if !epps.iter().any(|avail_epp| avail_epp == epp) {
             bail!(
@@ -257,42 +390,14 @@ impl Cpu {
         })
     }
 
-    pub fn get_available_epbs(&self) -> &'static [&'static str] {
-        if !self.has_cpufreq {
-            return &[];
-        }
-
-        &[
-            "1",
-            "2",
-            "3",
-            "4",
-            "5",
-            "6",
-            "7",
-            "8",
-            "9",
-            "10",
-            "11",
-            "12",
-            "13",
-            "14",
-            "15",
-            "performance",
-            "balance-performance",
-            "balance_performance", // Alternative form with underscore.
-            "balance-power",
-            "balance_power", // Alternative form with underscore.
-            "power",
-        ]
-    }
-
     pub fn set_epb(&self, epb: &str) -> anyhow::Result<()> {
-        let Self { number, .. } = self;
+        let Self {
+            number,
+            available_epbs: ref epbs,
+            ..
+        } = *self;
 
-        let epbs = self.get_available_epbs();
-
-        if !epbs.contains(&epb) {
+        if !epbs.iter().any(|avail_epb| avail_epb == epb) {
             bail!(
                 "EPB value '{epb}' is not available for {self}. available EPB values: {valid}",
                 valid = epbs.join(", "),
@@ -308,10 +413,10 @@ impl Cpu {
         })
     }
 
-    pub fn set_frequency_minimum(&self, frequency_mhz: u64) -> anyhow::Result<()> {
-        let Self { number, .. } = self;
+    pub fn set_frequency_mhz_minimum(&mut self, frequency_mhz: u64) -> anyhow::Result<()> {
+        let Self { number, .. } = *self;
 
-        self.validate_frequency_minimum(frequency_mhz)?;
+        self.validate_frequency_mhz_minimum(frequency_mhz)?;
 
         // We use u64 for the intermediate calculation to prevent overflow
         let frequency_khz = frequency_mhz * 1000;
@@ -323,10 +428,14 @@ impl Cpu {
         )
         .with_context(|| {
             format!("this probably means that {self} doesn't exist or doesn't support changing minimum frequency")
-        })
+        })?;
+
+        self.frequency_mhz_minimum = Some(frequency_mhz);
+
+        Ok(())
     }
 
-    fn validate_frequency_minimum(&self, new_frequency_mhz: u64) -> anyhow::Result<()> {
+    fn validate_frequency_mhz_minimum(&self, new_frequency_mhz: u64) -> anyhow::Result<()> {
         let Self { number, .. } = self;
 
         let Some(Ok(minimum_frequency_khz)) = fs::read_u64(format!(
@@ -346,10 +455,10 @@ impl Cpu {
         Ok(())
     }
 
-    pub fn set_frequency_maximum(&self, frequency_mhz: u64) -> anyhow::Result<()> {
-        let Self { number, .. } = self;
+    pub fn set_frequency_mhz_maximum(&mut self, frequency_mhz: u64) -> anyhow::Result<()> {
+        let Self { number, .. } = *self;
 
-        self.validate_frequency_maximum(frequency_mhz)?;
+        self.validate_frequency_mhz_maximum(frequency_mhz)?;
 
         // We use u64 for the intermediate calculation to prevent overflow
         let frequency_khz = frequency_mhz * 1000;
@@ -361,10 +470,14 @@ impl Cpu {
         )
         .with_context(|| {
             format!("this probably means that {self} doesn't exist or doesn't support changing maximum frequency")
-        })
+        })?;
+
+        self.frequency_mhz_maximum = Some(frequency_mhz);
+
+        Ok(())
     }
 
-    fn validate_frequency_maximum(&self, new_frequency_mhz: u64) -> anyhow::Result<()> {
+    fn validate_frequency_mhz_maximum(&self, new_frequency_mhz: u64) -> anyhow::Result<()> {
         let Self { number, .. } = self;
 
         let Some(Ok(maximum_frequency_khz)) = fs::read_u64(format!(

src/fs.rs

@@ -19,7 +19,7 @@ pub fn read(path: impl AsRef<Path>) -> Option<anyhow::Result<String>> {
     let path = path.as_ref();
 
     match fs::read_to_string(path) {
-        Ok(string) => Some(Ok(string)),
+        Ok(string) => Some(Ok(string.trim().to_owned())),
 
         Err(error) if error.kind() == io::ErrorKind::NotFound => None,
 

src/monitor.rs

@@ -21,18 +21,6 @@ pub fn get_cpu_core_info(
     prev_times: &CpuTimes,
     current_times: &CpuTimes,
 ) -> anyhow::Result<CpuCoreInfo> {
-    let cpufreq_path = PathBuf::from(format!("/sys/devices/system/cpu/cpu{core_id}/cpufreq/"));
-
-    let current_frequency_mhz = read_sysfs_value::<u32>(cpufreq_path.join("scaling_cur_freq"))
-        .map(|khz| khz / 1000)
-        .ok();
-    let min_frequency_mhz = read_sysfs_value::<u32>(cpufreq_path.join("scaling_min_freq"))
-        .map(|khz| khz / 1000)
-        .ok();
-    let max_frequency_mhz = read_sysfs_value::<u32>(cpufreq_path.join("scaling_max_freq"))
-        .map(|khz| khz / 1000)
-        .ok();
-
     // Temperature detection.
     // Should be generic enough to be able to support for multiple hardware sensors
     // with the possibility of extending later down the road.
@@ -144,9 +132,6 @@ pub fn get_cpu_core_info(
 
     Ok(CpuCoreInfo {
         core_id,
-        current_frequency_mhz,
-        min_frequency_mhz,
-        max_frequency_mhz,
         usage_percent,
         temperature_celsius,
     })
@@ -253,47 +238,9 @@ pub fn get_all_cpu_core_info() -> anyhow::Result<Vec<CpuCoreInfo>> {
 }
 
 pub fn get_cpu_global_info(cpu_cores: &[CpuCoreInfo]) -> CpuGlobalInfo {
-    // Find a valid CPU to read global settings from
-    // Try cpu0 first, then fall back to any available CPU with cpufreq
-    let mut cpufreq_base_path_buf = PathBuf::from("/sys/devices/system/cpu/cpu0/cpufreq/");
-
-    if !cpufreq_base_path_buf.exists() {
-        let core_count = get_real_cpus().unwrap_or_else(|e| {
-            eprintln!("Warning: {e}");
-            0
-        });
-
-        for i in 0..core_count {
-            let test_path = PathBuf::from(format!("/sys/devices/system/cpu/cpu{i}/cpufreq/"));
-            if test_path.exists() {
-                cpufreq_base_path_buf = test_path;
-                break; // Exit the loop as soon as we find a valid path
-            }
-        }
-    }
-
     let turbo_status_path = Path::new("/sys/devices/system/cpu/intel_pstate/no_turbo");
     let boost_path = Path::new("/sys/devices/system/cpu/cpufreq/boost");
 
-    let current_governor = if cpufreq_base_path_buf.join("scaling_governor").exists() {
-        read_sysfs_file_trimmed(cpufreq_base_path_buf.join("scaling_governor")).ok()
-    } else {
-        None
-    };
-
-    let available_governors = if cpufreq_base_path_buf
-        .join("scaling_available_governors")
-        .exists()
-    {
-        read_sysfs_file_trimmed(cpufreq_base_path_buf.join("scaling_available_governors"))
-            .map_or_else(
-                |_| vec![],
-                |s| s.split_whitespace().map(String::from).collect(),
-            )
-    } else {
-        vec![]
-    };
-
     let turbo_status = if turbo_status_path.exists() {
         // 0 means turbo enabled, 1 means disabled for intel_pstate
         read_sysfs_value::<u8>(turbo_status_path)
@@ -306,14 +253,6 @@ pub fn get_cpu_global_info(cpu_cores: &[CpuCoreInfo]) -> CpuGlobalInfo {
         None
     };
 
-    // EPP (Energy Performance Preference)
-    let energy_perf_pref =
-        read_sysfs_file_trimmed(cpufreq_base_path_buf.join("energy_performance_preference")).ok();
-
-    // EPB (Energy Performance Bias)
-    let energy_perf_bias =
-        read_sysfs_file_trimmed(cpufreq_base_path_buf.join("energy_performance_bias")).ok();
-
     let platform_profile = read_sysfs_file_trimmed("/sys/firmware/acpi/platform_profile").ok();
 
     // Calculate average CPU temperature from the core temperatures
@@ -340,11 +279,7 @@ pub fn get_cpu_global_info(cpu_cores: &[CpuCoreInfo]) -> CpuGlobalInfo {
 
     // Return the constructed CpuGlobalInfo
     CpuGlobalInfo {
-        current_governor,
-        available_governors,
         turbo_status,
-        epp: energy_perf_pref,
-        epb: energy_perf_bias,
         platform_profile,
         average_temperature_celsius,
     }