Show top 3 C-states with usage percentages

- Changed CpuData.cstate from String to Vec<CStateInfo>
- Added CStateInfo struct with name and percent fields
- Collector calculates percentage for each C-state based on accumulated time
- Sorts and returns top 3 C-states by usage
- Dashboard displays: "C10:79% C8:10% C6:8%"

Provides better visibility into CPU idle state distribution.

Bump version to v0.1.209

Co-Authored-By: Claude <noreply@anthropic.com>

Cargo.lock

@@ -279,7 +279,7 @@ checksum = "a1d728cc89cf3aee9ff92b05e62b19ee65a02b5702cff7d5a377e32c6ae29d8d"
 
 [[package]]
 name = "cm-dashboard"
-version = "0.1.206"
+version = "0.1.208"
 dependencies = [
  "anyhow",
  "chrono",
@@ -301,7 +301,7 @@ dependencies = [
 
 [[package]]
 name = "cm-dashboard-agent"
-version = "0.1.207"
+version = "0.1.208"
 dependencies = [
  "anyhow",
  "async-trait",
@@ -324,7 +324,7 @@ dependencies = [
 
 [[package]]
 name = "cm-dashboard-shared"
-version = "0.1.207"
+version = "0.1.208"
 dependencies = [
  "chrono",
  "serde",

agent/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard-agent"
-version = "0.1.208"
+version = "0.1.209"
 edition = "2021"
 
 [dependencies]

agent/src/collectors/cpu.rs

@@ -119,30 +119,27 @@ impl CpuCollector {
         utils::parse_u64(content.trim())
     }
 
-    /// Collect CPU C-state (idle depth) and populate AgentData
+    /// Collect CPU C-state (idle depth) and populate AgentData with top 3 C-states by usage
     async fn collect_cstate(&self, agent_data: &mut AgentData) -> Result<(), CollectorError> {
         // Read C-state usage from first CPU (representative of overall system)
         // C-states indicate CPU idle depth: C1=light sleep, C6=deep sleep, C10=deepest
 
-        let mut deepest_state = String::from("C0"); // Default to active
-        let mut max_time: u64 = 0;
+        let mut cstate_times: Vec<(String, u64)> = Vec::new();
+        let mut total_time: u64 = 0;
 
-        // Check C-states from CPU0
+        // Collect all C-state times from CPU0
         for state_num in 0..=10 {
             let time_path = format!("/sys/devices/system/cpu/cpu0/cpuidle/state{}/time", state_num);
             let name_path = format!("/sys/devices/system/cpu/cpu0/cpuidle/state{}/name", state_num);
 
             if let Ok(time_str) = utils::read_proc_file(&time_path) {
                 if let Ok(time) = utils::parse_u64(time_str.trim()) {
-                    if time > max_time {
-                        // This state has most accumulated time
-                        if let Ok(name) = utils::read_proc_file(&name_path) {
-                            let state_name = name.trim().to_string();
-                            // Skip POLL state (not real idle)
-                            if state_name != "POLL" {
-                                max_time = time;
-                                deepest_state = state_name;
-                            }
+                    if let Ok(name) = utils::read_proc_file(&name_path) {
+                        let state_name = name.trim().to_string();
+                        // Skip POLL state (not real idle)
+                        if state_name != "POLL" && time > 0 {
+                            cstate_times.push((state_name, time));
+                            total_time += time;
                         }
                     }
                 }
@@ -152,7 +149,26 @@ impl CpuCollector {
             }
         }
 
-        agent_data.system.cpu.cstate = deepest_state;
+        // Sort by time descending to get top 3
+        cstate_times.sort_by(|a, b| b.1.cmp(&a.1));
+
+        // Calculate percentages for top 3 and populate AgentData
+        agent_data.system.cpu.cstates = cstate_times
+            .iter()
+            .take(3)
+            .map(|(name, time)| {
+                let percent = if total_time > 0 {
+                    (*time as f32 / total_time as f32) * 100.0
+                } else {
+                    0.0
+                };
+                cm_dashboard_shared::CStateInfo {
+                    name: name.clone(),
+                    percent,
+                }
+            })
+            .collect();
+
         Ok(())
     }
 }

dashboard/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard"
-version = "0.1.208"
+version = "0.1.209"
 edition = "2021"
 
 [dependencies]

dashboard/src/ui/widgets/system.rs

@@ -26,7 +26,7 @@ pub struct SystemWidget {
     cpu_load_1min: Option<f32>,
     cpu_load_5min: Option<f32>,
     cpu_load_15min: Option<f32>,
-    cpu_cstate: Option<String>,
+    cpu_cstates: Vec<cm_dashboard_shared::CStateInfo>,
     cpu_status: Status,
     
     // Memory metrics
@@ -102,7 +102,7 @@ impl SystemWidget {
             cpu_load_1min: None,
             cpu_load_5min: None,
             cpu_load_15min: None,
-            cpu_cstate: None,
+            cpu_cstates: Vec::new(),
             cpu_status: Status::Unknown,
             memory_usage_percent: None,
             memory_used_gb: None,
@@ -137,12 +137,18 @@ impl SystemWidget {
         }
     }
 
-    /// Format CPU C-state (idle depth)
+    /// Format CPU C-states (idle depth) with percentages
     fn format_cpu_cstate(&self) -> String {
-        match &self.cpu_cstate {
-            Some(cstate) => cstate.clone(),
-            None => "—".to_string(),
+        if self.cpu_cstates.is_empty() {
+            return "—".to_string();
         }
+
+        // Format top 3 C-states with percentages: "C10:79% C8:10% C6:8%"
+        self.cpu_cstates
+            .iter()
+            .map(|cs| format!("{}:{:.0}%", cs.name, cs.percent))
+            .collect::<Vec<_>>()
+            .join(" ")
     }
 
     /// Format memory usage
@@ -188,7 +194,7 @@ impl Widget for SystemWidget {
         self.cpu_load_1min = Some(cpu.load_1min);
         self.cpu_load_5min = Some(cpu.load_5min);
         self.cpu_load_15min = Some(cpu.load_15min);
-        self.cpu_cstate = Some(cpu.cstate.clone());
+        self.cpu_cstates = cpu.cstates.clone();
         self.cpu_status = Status::Ok;
 
         // Extract memory data directly

shared/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "cm-dashboard-shared"
-version = "0.1.208"
+version = "0.1.209"
 edition = "2021"
 
 [dependencies]

shared/src/agent_data.rs

@@ -40,13 +40,20 @@ pub struct NetworkInterfaceData {
     pub vlan_id: Option<u16>,
 }
 
+/// CPU C-state usage information
+#[derive(Debug, Clone, Serialize, Deserialize)]
+pub struct CStateInfo {
+    pub name: String,
+    pub percent: f32,
+}
+
 /// CPU monitoring data
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct CpuData {
     pub load_1min: f32,
     pub load_5min: f32,
     pub load_15min: f32,
-    pub cstate: String, // Deepest C-state in use (C1, C6, C10, etc.) - indicates CPU idle depth
+    pub cstates: Vec<CStateInfo>, // C-state usage percentages (C1, C6, C10, etc.) - indicates CPU idle depth distribution
     pub temperature_celsius: Option<f32>,
     pub load_status: Status,
     pub temperature_status: Status,
@@ -204,7 +211,7 @@ impl AgentData {
                     load_1min: 0.0,
                     load_5min: 0.0,
                     load_15min: 0.0,
-                    cstate: String::from("C0"),
+                    cstates: Vec::new(),
                     temperature_celsius: None,
                     load_status: Status::Unknown,
                     temperature_status: Status::Unknown,