Increment 2: deep per-process data + process inspector

- ProcessItem: disk read/write rate + cumulative bytes, energy-impact score,
  executable path; equality now tracks energy/disk so the table refreshes
- ProcessMonitor: disk I/O + idle-wakeup rates from rusage_info_v4; full path
  capture; on-demand KERN_PROCARGS2 args + PROC_PIDLISTFDS open-file count
- EnergyModel heuristic + pure ProcArgs parser (both unit-tested)
- ProcessView: sortable Energy + Disk I/O columns (icon folded into Name to stay
  within SwiftUI's 10-column limit); Get Info (double-click / ⌘I) opens inspector
- ProcessInspectorSheet: live stats, path, args, open files, Reveal/Copy Path
- 10 new tests (32 total green); smoke: stable under CPU+disk load

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

TopManager.xcodeproj/project.pbxproj

@@ -14,6 +14,7 @@
 		1F25A84B560709AE71C27D23 /* GPUInfo.swift in Sources */ = {isa = PBXBuildFile; fileRef = F481045B4FC6017F50849FF1 /* GPUInfo.swift */; };
 		24F63686869A69C8B0FCD7FA /* MetricsStoreTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 0E786723FC46A64EFF5D3CE4 /* MetricsStoreTests.swift */; };
 		266B888ADE2FDDBCEC8D28A5 /* MemoryLineChart.swift in Sources */ = {isa = PBXBuildFile; fileRef = 7326AE4B2D75476BDCFE3FFB /* MemoryLineChart.swift */; };
+		2B74C177F49B4358D9642712 /* ProcessDataTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 332290DABD5326C87258723C /* ProcessDataTests.swift */; };
 		341C12CED58388D32ED6C5BB /* ContentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = C4F1ACD0492CAB741595DEAA /* ContentView.swift */; };
 		35852165B2DA76AB7F073723 /* MenuBarView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9D71CC63FC2FEF52A069372E /* MenuBarView.swift */; };
 		4427B8406B25B8FEDF27CDBA /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 334573CEB47D60570A40B55D /* Assets.xcassets */; };
@@ -64,6 +65,7 @@
 		295232B4C746511757DCF8FE /* ProcessMonitor.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ProcessMonitor.swift; sourceTree = "<group>"; };
 		3010F605712E09175D9D8878 /* NetworkInfo.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NetworkInfo.swift; sourceTree = "<group>"; };
 		301352EB5B362C732CE1A246 /* FormattingTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FormattingTests.swift; sourceTree = "<group>"; };
+		332290DABD5326C87258723C /* ProcessDataTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ProcessDataTests.swift; sourceTree = "<group>"; };
 		334573CEB47D60570A40B55D /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
 		33BCE156CB39EDADFFC938F9 /* Info.plist */ = {isa = PBXFileReference; lastKnownFileType = text.plist; path = Info.plist; sourceTree = "<group>"; };
 		347E47F825E496F40FD8ED11 /* NetworkMonitor.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = NetworkMonitor.swift; sourceTree = "<group>"; };
@@ -210,6 +212,7 @@
 			children = (
 				301352EB5B362C732CE1A246 /* FormattingTests.swift */,
 				0E786723FC46A64EFF5D3CE4 /* MetricsStoreTests.swift */,
+				332290DABD5326C87258723C /* ProcessDataTests.swift */,
 			);
 			path = TopManagerTests;
 			sourceTree = "<group>";
@@ -329,6 +332,7 @@
 			files = (
 				49D85FF611927294159C89D1 /* FormattingTests.swift in Sources */,
 				24F63686869A69C8B0FCD7FA /* MetricsStoreTests.swift in Sources */,
+				2B74C177F49B4358D9642712 /* ProcessDataTests.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

TopManager/Models/ProcessInfo.swift

@@ -14,9 +14,17 @@ struct ProcessItem: Identifiable, Hashable {
     let icon: NSImage?
     let parentPid: pid_t
     let startTime: Date?
+    let diskReadRate: Double    // bytes/sec read from disk
+    let diskWriteRate: Double   // bytes/sec written to disk
+    let diskReadBytes: UInt64   // cumulative bytes read
+    let diskWriteBytes: UInt64  // cumulative bytes written
+    let energyImpact: Double    // heuristic energy-impact score (proxy for Activity Monitor's)
+    let executablePath: String?
 
     var iconPlaceholder: String { "" }
 
+    var diskTotalRate: Double { diskReadRate + diskWriteRate }
+
     init(
         pid: pid_t,
         name: String,
@@ -28,7 +36,13 @@ struct ProcessItem: Identifiable, Hashable {
         state: ProcessState,
         icon: NSImage?,
         parentPid: pid_t,
-        startTime: Date?
+        startTime: Date?,
+        diskReadRate: Double = 0,
+        diskWriteRate: Double = 0,
+        diskReadBytes: UInt64 = 0,
+        diskWriteBytes: UInt64 = 0,
+        energyImpact: Double = 0,
+        executablePath: String? = nil
     ) {
         self.id = pid
         self.pid = pid
@@ -42,6 +56,12 @@ struct ProcessItem: Identifiable, Hashable {
         self.icon = icon
         self.parentPid = parentPid
         self.startTime = startTime
+        self.diskReadRate = diskReadRate
+        self.diskWriteRate = diskWriteRate
+        self.diskReadBytes = diskReadBytes
+        self.diskWriteBytes = diskWriteBytes
+        self.energyImpact = energyImpact
+        self.executablePath = executablePath
     }
 
     func hash(into hasher: inout Hasher) {
@@ -54,7 +74,19 @@ struct ProcessItem: Identifiable, Hashable {
         lhs.cpuUsageTotal == rhs.cpuUsageTotal &&
         lhs.memoryUsage == rhs.memoryUsage &&
         lhs.threadCount == rhs.threadCount &&
-        lhs.state == rhs.state
+        lhs.state == rhs.state &&
+        lhs.diskReadRate == rhs.diskReadRate &&
+        lhs.diskWriteRate == rhs.diskWriteRate &&
+        lhs.energyImpact == rhs.energyImpact
+    }
+}
+
+/// Heuristic "energy impact" proxy. This is *not* Apple's exact private formula;
+/// it approximates it: sustained CPU dominates, with a smaller penalty for idle
+/// (timer) wakeups, which correlate with power draw even at low CPU.
+enum EnergyModel {
+    static func impact(cpuPercent: Double, idleWakeupsPerSec: Double) -> Double {
+        max(0, cpuPercent) + max(0, idleWakeupsPerSec) * 0.045
     }
 }
 

TopManager/Services/ProcessMonitor.swift

@@ -4,10 +4,12 @@ import AppKit
 
 final class ProcessMonitor {
     private var previousCPUTimes: [pid_t: (user: UInt64, system: UInt64, timestamp: Date)] = [:]
+    private var previousDiskIO: [pid_t: (read: UInt64, write: UInt64, idle: UInt64, timestamp: Date)] = [:]
     private var lastKnownCPU: [pid_t: Double] = [:]  // Cache last known CPU usage
     private let iconCache = NSCache<NSNumber, NSImage>()
     private var noIconPids: Set<pid_t> = []  // Cache for PIDs with no icon
     private var nameCache: [pid_t: String] = [:]
+    private var pathCache: [pid_t: String] = [:]     // Full executable path
     private var userCache: [uid_t: String] = [:]
     private let timebaseInfo: mach_timebase_info_data_t
     private var refreshCounter = 0
@@ -48,8 +50,10 @@ final class ProcessMonitor {
         let stalePids = Set(nameCache.keys).subtracting(currentPids)
         for pid in stalePids {
             nameCache.removeValue(forKey: pid)
+            pathCache.removeValue(forKey: pid)
             iconCache.removeObject(forKey: NSNumber(value: pid))
             previousCPUTimes.removeValue(forKey: pid)
+            previousDiskIO.removeValue(forKey: pid)
             noIconPids.remove(pid)
             lastKnownCPU.removeValue(forKey: pid)
         }
@@ -80,6 +84,11 @@ final class ProcessMonitor {
         let memoryUsage: Int64
         let threadCount: Int32
         let cpuUsage: Double
+        var diskReadRate: Double = 0
+        var diskWriteRate: Double = 0
+        var diskReadBytes: UInt64 = 0
+        var diskWriteBytes: UInt64 = 0
+        var energyImpact: Double = 0
 
         if needsDetailedInfo {
             var taskInfo = proc_taskinfo()
@@ -96,6 +105,17 @@ final class ProcessMonitor {
                     userTime: rusageData.userTime,
                     systemTime: rusageData.systemTime
                 )
+                let extra = computeExtraRates(
+                    pid: pid,
+                    diskRead: rusageData.diskRead,
+                    diskWrite: rusageData.diskWrite,
+                    idleWakeups: rusageData.idleWakeups
+                )
+                diskReadRate = extra.readRate
+                diskWriteRate = extra.writeRate
+                diskReadBytes = rusageData.diskRead
+                diskWriteBytes = rusageData.diskWrite
+                energyImpact = EnergyModel.impact(cpuPercent: cpuUsage, idleWakeupsPerSec: extra.idleWakeupsPerSec)
             } else {
                 memoryUsage = 0
                 threadCount = 0
@@ -126,7 +146,13 @@ final class ProcessMonitor {
             state: state,
             icon: icon,
             parentPid: parentPid,
-            startTime: startTime
+            startTime: startTime,
+            diskReadRate: diskReadRate,
+            diskWriteRate: diskWriteRate,
+            diskReadBytes: diskReadBytes,
+            diskWriteBytes: diskWriteBytes,
+            energyImpact: energyImpact,
+            executablePath: pathCache[pid]
         )
     }
 
@@ -150,6 +176,7 @@ final class ProcessMonitor {
             // This protects against edge cases where buffer might not be null-terminated
             let pathData = Data(bytes: pathBuffer, count: pathLength)
             if let path = String(data: pathData, encoding: .utf8) {
+                pathCache[pid] = path
                 name = (path as NSString).lastPathComponent
             } else {
                 name = "Process \(pid)"
@@ -203,7 +230,16 @@ final class ProcessMonitor {
         return name
     }
 
-    private func fetchRusageData(pid: pid_t) -> (memory: Int64, userTime: UInt64, systemTime: UInt64) {
+    private struct RusageData {
+        var memory: Int64 = 0
+        var userTime: UInt64 = 0
+        var systemTime: UInt64 = 0
+        var diskRead: UInt64 = 0
+        var diskWrite: UInt64 = 0
+        var idleWakeups: UInt64 = 0
+    }
+
+    private func fetchRusageData(pid: pid_t) -> RusageData {
         var rusage = rusage_info_v4()
         let result = withUnsafeMutablePointer(to: &rusage) { ptr -> Int32 in
             ptr.withMemoryRebound(to: rusage_info_t?.self, capacity: 1) { rusagePtr in
@@ -212,25 +248,45 @@ final class ProcessMonitor {
         }
 
         if result == 0 {
-            return (
+            return RusageData(
                 memory: Int64(rusage.ri_phys_footprint),
                 userTime: rusage.ri_user_time,
-                systemTime: rusage.ri_system_time
+                systemTime: rusage.ri_system_time,
+                diskRead: rusage.ri_diskio_bytesread,
+                diskWrite: rusage.ri_diskio_byteswritten,
+                idleWakeups: rusage.ri_pkg_idle_wkups
             )
         }
 
-        // Fallback to proc_taskinfo if rusage fails
+        // Fallback to proc_taskinfo if rusage fails (no disk/wakeup data available)
         var taskInfo = proc_taskinfo()
         let taskInfoSize = Int32(MemoryLayout<proc_taskinfo>.size)
         if proc_pidinfo(pid, PROC_PIDTASKINFO, 0, &taskInfo, taskInfoSize) == taskInfoSize {
-            return (
+            return RusageData(
                 memory: Int64(taskInfo.pti_resident_size),
                 userTime: taskInfo.pti_total_user,
                 systemTime: taskInfo.pti_total_system
             )
         }
 
-        return (memory: 0, userTime: 0, systemTime: 0)
+        return RusageData()
+    }
+
+    /// Computes per-second disk read/write and idle-wakeup rates from cumulative
+    /// counters, using the previous snapshot. Mirrors the CPU delta approach.
+    private func computeExtraRates(pid: pid_t, diskRead: UInt64, diskWrite: UInt64, idleWakeups: UInt64)
+        -> (readRate: Double, writeRate: Double, idleWakeupsPerSec: Double) {
+        let now = Date()
+        defer { previousDiskIO[pid] = (diskRead, diskWrite, idleWakeups, now) }
+
+        guard let prev = previousDiskIO[pid] else { return (0, 0, 0) }
+        let dt = now.timeIntervalSince(prev.timestamp)
+        guard dt > 0 else { return (0, 0, 0) }
+
+        let readRate = diskRead >= prev.read ? Double(diskRead - prev.read) / dt : 0
+        let writeRate = diskWrite >= prev.write ? Double(diskWrite - prev.write) / dt : 0
+        let idleRate = idleWakeups >= prev.idle ? Double(idleWakeups - prev.idle) / dt : 0
+        return (readRate, writeRate, idleRate)
     }
 
     private func fetchBasicProcessInfo(pid: pid_t) -> ProcessItem? {
@@ -373,3 +429,55 @@ final class ProcessMonitor {
         previousCPUTimes.removeAll()
     }
 }
+
+// MARK: - On-demand deep inspection (called only when the inspector is open)
+
+/// Pure parser for a KERN_PROCARGS2 buffer, split out so it is unit-testable
+/// without a live process. Layout: [Int32 argc][exec_path\0][\0 padding][argv…][envp…]
+enum ProcArgs {
+    static func parse(_ bytes: [UInt8]) -> (path: String, args: [String])? {
+        guard bytes.count > 4 else { return nil }
+        // argc: first 4 bytes, host little-endian (arm64/x86_64)
+        let argc = Int(bytes[0]) | (Int(bytes[1]) << 8) | (Int(bytes[2]) << 16) | (Int(bytes[3]) << 24)
+        guard argc >= 0 else { return nil }
+
+        var i = 4
+        let pathStart = i
+        while i < bytes.count && bytes[i] != 0 { i += 1 }
+        let path = String(decoding: bytes[pathStart..<i], as: UTF8.self)
+
+        // Skip the NUL padding between exec_path and argv[0]
+        while i < bytes.count && bytes[i] == 0 { i += 1 }
+
+        var args: [String] = []
+        var consumed = 0
+        while consumed < argc && i < bytes.count {
+            let start = i
+            while i < bytes.count && bytes[i] != 0 { i += 1 }
+            args.append(String(decoding: bytes[start..<i], as: UTF8.self))
+            i += 1 // skip the NUL terminator
+            consumed += 1
+        }
+        return (path, args)
+    }
+}
+
+/// Fetches the launch arguments for a process (works for the current user's
+/// processes without elevated privileges; returns [] when denied/unavailable).
+func fetchProcessArguments(pid: pid_t) -> [String] {
+    var mib: [Int32] = [CTL_KERN, KERN_PROCARGS2, pid]
+    var size = 0
+    guard sysctl(&mib, 3, nil, &size, nil, 0) == 0, size > 0 else { return [] }
+
+    var buffer = [UInt8](repeating: 0, count: size)
+    guard sysctl(&mib, 3, &buffer, &size, nil, 0) == 0 else { return [] }
+    // sysctl may shrink `size`; only parse what was actually written.
+    return ProcArgs.parse(Array(buffer.prefix(size)))?.args ?? []
+}
+
+/// Counts open file descriptors for a process (files, sockets, pipes, …).
+func fetchOpenFileCount(pid: pid_t) -> Int? {
+    let bufferSize = proc_pidinfo(pid, PROC_PIDLISTFDS, 0, nil, 0)
+    guard bufferSize > 0 else { return nil }
+    return Int(bufferSize) / MemoryLayout<proc_fdinfo>.stride
+}

TopManager/Views/Processes/ProcessDetailView.swift

@@ -1,34 +1,67 @@
 import SwiftUI
+import AppKit
 
-struct ProcessDetailView: View {
-    let process: ProcessItem
+/// Deep-dive inspector for a single process, presented as a sheet. Shows live
+/// stats (looked up from the monitor by PID) plus on-demand details that are too
+/// expensive to compute for every row every cycle: full path, launch arguments,
+/// and open-file-descriptor count.
+struct ProcessInspectorSheet: View {
+    let initialProcess: ProcessItem
+    @EnvironmentObject var monitor: SystemMonitor
+    @Environment(\.dismiss) private var dismiss
+
+    @State private var arguments: [String] = []
+    @State private var openFiles: Int?
+    @State private var loadedDetails = false
+
+    /// Prefer the latest live snapshot for this PID; fall back to the one we opened with.
+    private var process: ProcessItem {
+        monitor.processes.first { $0.pid == initialProcess.pid } ?? initialProcess
+    }
 
     var body: some View {
         VStack(alignment: .leading, spacing: 16) {
-            // Header
+            header
+
+            Divider()
+
+            ScrollView {
+                VStack(alignment: .leading, spacing: 16) {
+                    liveStats
+                    pathSection
+                    detailsSection
+                }
+            }
+
+            Divider()
+            footer
+        }
+        .padding(20)
+        .frame(width: 460, height: 560)
+        .task(id: initialProcess.pid) {
+            let pid = initialProcess.pid
+            let result = await Task.detached(priority: .userInitiated) {
+                (args: fetchProcessArguments(pid: pid), files: fetchOpenFileCount(pid: pid))
+            }.value
+            arguments = result.args
+            openFiles = result.files
+            loadedDetails = true
+        }
+    }
+
+    private var header: some View {
         HStack(spacing: 12) {
             if let icon = process.icon {
-                    Image(nsImage: icon)
-                        .resizable()
-                        .frame(width: 48, height: 48)
+                Image(nsImage: icon).resizable().frame(width: 44, height: 44)
             } else {
-                    Image(systemName: "app.dashed")
-                        .font(.system(size: 48))
+                Image(systemName: "app.dashed").font(.system(size: 40)).foregroundColor(.secondary)
             }
-
-                VStack(alignment: .leading) {
-                    Text(process.name)
-                        .font(.title2)
-                        .fontWeight(.semibold)
-
-                    Text("PID: \(process.pid)")
-                        .foregroundColor(.secondary)
+            VStack(alignment: .leading, spacing: 2) {
+                Text(process.name).font(.title2).fontWeight(.semibold).lineLimit(1)
+                Text("PID \(process.pid)  •  \(process.user)").foregroundColor(.secondary)
             }
-
             Spacer()
-
-                VStack(alignment: .trailing) {
-                    HStack {
+            HStack(spacing: 4) {
                 Image(systemName: process.state.symbol)
                 Text(process.state.rawValue)
             }
@@ -36,28 +69,70 @@ struct ProcessDetailView: View {
         }
     }
 
-            Divider()
-
-            // Details grid
-            LazyVGrid(columns: [
-                GridItem(.flexible()),
-                GridItem(.flexible())
-            ], alignment: .leading, spacing: 12) {
-                DetailRow(label: "CPU Usage", value: String(format: "%.1f%%", process.cpuUsage))
+    private var liveStats: some View {
+        LazyVGrid(columns: [GridItem(.flexible()), GridItem(.flexible()), GridItem(.flexible())],
+                  alignment: .leading, spacing: 12) {
+            DetailRow(label: "CPU (core)", value: String(format: "%.1f%%", process.cpuUsage))
+            DetailRow(label: "CPU (total)", value: String(format: "%.2f%%", process.cpuUsageTotal))
+            DetailRow(label: "Energy", value: String(format: "%.1f", process.energyImpact))
             DetailRow(label: "Memory", value: formatBytes(process.memoryUsage))
             DetailRow(label: "Threads", value: "\(process.threadCount)")
-                DetailRow(label: "User", value: process.user)
+            DetailRow(label: "Open files", value: openFiles.map(String.init) ?? "…")
+            DetailRow(label: "Disk read/s", value: process.diskReadRate > 0 ? formatBytesPerSecond(process.diskReadRate) : "—")
+            DetailRow(label: "Disk write/s", value: process.diskWriteRate > 0 ? formatBytesPerSecond(process.diskWriteRate) : "—")
+            DetailRow(label: "Disk total", value: formatBytes(process.diskReadBytes + process.diskWriteBytes))
             DetailRow(label: "Parent PID", value: "\(process.parentPid)")
-
-                if let startTime = process.startTime {
-                    DetailRow(label: "Started", value: formatDate(startTime))
+            if let start = process.startTime {
+                DetailRow(label: "Started", value: formatDate(start))
+            }
         }
     }
 
+    @ViewBuilder private var pathSection: some View {
+        if let path = process.executablePath {
+            VStack(alignment: .leading, spacing: 4) {
+                Text("Path").font(.caption).foregroundColor(.secondary)
+                Text(path)
+                    .font(.system(.caption, design: .monospaced))
+                    .textSelection(.enabled)
+                    .lineLimit(3)
+                    .truncationMode(.middle)
+            }
+        }
+    }
+
+    @ViewBuilder private var detailsSection: some View {
+        VStack(alignment: .leading, spacing: 4) {
+            Text("Launch arguments").font(.caption).foregroundColor(.secondary)
+            if !loadedDetails {
+                Text("Loading…").font(.caption).foregroundColor(.secondary)
+            } else if arguments.isEmpty {
+                Text("Unavailable (process may be owned by another user)")
+                    .font(.caption).foregroundColor(.secondary)
+            } else {
+                Text(arguments.joined(separator: " "))
+                    .font(.system(.caption, design: .monospaced))
+                    .textSelection(.enabled)
+                    .frame(maxWidth: .infinity, alignment: .leading)
+            }
+        }
+    }
+
+    private var footer: some View {
+        HStack {
+            if let path = process.executablePath {
+                Button {
+                    NSWorkspace.shared.selectFile(path, inFileViewerRootedAtPath: "")
+                } label: { Label("Reveal in Finder", systemImage: "folder") }
+
+                Button {
+                    NSPasteboard.general.clearContents()
+                    NSPasteboard.general.setString(path, forType: .string)
+                } label: { Label("Copy Path", systemImage: "doc.on.doc") }
+            }
             Spacer()
+            Button("Close") { dismiss() }.keyboardShortcut(.defaultAction)
         }
-        .padding()
-        .frame(minWidth: 300)
     }
 
     private func stateColor(_ state: ProcessState) -> Color {
@@ -95,17 +170,14 @@ struct DetailRow: View {
 }
 
 #Preview {
-    ProcessDetailView(process: ProcessItem(
-        pid: 1234,
-        name: "Safari",
-        user: "ariel",
-        cpuUsage: 12.5,
-        cpuUsageTotal: 1.56,
-        memoryUsage: 512 * 1024 * 1024,
-        threadCount: 42,
-        state: .running,
-        icon: nil,
-        parentPid: 1,
-        startTime: Date()
+    ProcessInspectorSheet(initialProcess: ProcessItem(
+        pid: 1234, name: "Safari", user: "ariel",
+        cpuUsage: 12.5, cpuUsageTotal: 1.56,
+        memoryUsage: 512 * 1024 * 1024, threadCount: 42,
+        state: .running, icon: nil, parentPid: 1, startTime: Date(),
+        diskReadRate: 2048, diskWriteRate: 1024,
+        diskReadBytes: 900_000, diskWriteBytes: 400_000,
+        energyImpact: 14.2, executablePath: "/Applications/Safari.app/Contents/MacOS/Safari"
     ))
+    .environmentObject(SystemMonitor.shared)
 }

TopManager/Views/Processes/ProcessView.swift

@@ -1,7 +1,7 @@
 import SwiftUI
 
 enum ProcessSortColumn: String {
-    case name, pid, cpu, cpuTotal, memory, threads, user, state
+    case name, pid, cpu, cpuTotal, memory, threads, user, state, energy, disk
 }
 
 struct ProcessView: View {
@@ -30,6 +30,9 @@ struct ProcessView: View {
     @State private var errorTitle = ""
     @State private var errorMessage = ""
 
+    // Deep-dive inspector
+    @State private var inspectorProcess: ProcessItem?
+
     // Protected system processes that cannot be force-killed via UI
     private static let protectedProcesses = ["kernel_task", "launchd", "WindowServer", "loginwindow"]
 
@@ -63,6 +66,10 @@ struct ProcessView: View {
                 comparison = lhs.user.localizedCaseInsensitiveCompare(rhs.user)
             case .state:
                 comparison = lhs.state.rawValue.compare(rhs.state.rawValue)
+            case .energy:
+                comparison = lhs.energyImpact < rhs.energyImpact ? .orderedAscending : (lhs.energyImpact > rhs.energyImpact ? .orderedDescending : .orderedSame)
+            case .disk:
+                comparison = lhs.diskTotalRate < rhs.diskTotalRate ? .orderedAscending : (lhs.diskTotalRate > rhs.diskTotalRate ? .orderedDescending : .orderedSame)
             }
 
             // Primary sort
@@ -89,7 +96,8 @@ struct ProcessView: View {
 
             // Process table
             Table(displayedProcesses, selection: $selectedProcess, sortOrder: $sortOrder) {
-                TableColumn("") { process in
+                TableColumn("Name", value: \.name) { process in
+                    HStack(spacing: 6) {
                         if let icon = process.icon {
                             Image(nsImage: icon)
                                 .resizable()
@@ -97,15 +105,13 @@ struct ProcessView: View {
                         } else {
                             Image(systemName: "app.dashed")
                                 .frame(width: 16, height: 16)
+                                .foregroundColor(.secondary)
                         }
-                }
-                .width(24)
-
-                TableColumn("Name", value: \.name) { process in
                         Text(process.name)
                             .lineLimit(1)
                     }
-                .width(min: 150, ideal: 200)
+                }
+                .width(min: 170, ideal: 220)
 
                 TableColumn("PID", value: \.pid) { process in
                     Text("\(process.pid)")
@@ -127,12 +133,29 @@ struct ProcessView: View {
                 }
                 .width(70)
 
+                TableColumn("Energy", value: \.energyImpact) { process in
+                    Text(String(format: "%.1f", process.energyImpact))
+                        .monospacedDigit()
+                        .foregroundColor(energyColor(process.energyImpact))
+                }
+                .width(60)
+
                 TableColumn("Memory", value: \.memoryUsage) { process in
                     Text(formatBytes(process.memoryUsage))
                         .monospacedDigit()
                 }
                 .width(80)
 
+                TableColumn("Disk I/O", value: \.diskTotalRate) { process in
+                    if process.diskTotalRate > 0 {
+                        Text(formatBytesPerSecond(process.diskTotalRate))
+                            .monospacedDigit()
+                    } else {
+                        Text("—").foregroundColor(.secondary)
+                    }
+                }
+                .width(90)
+
                 TableColumn("Threads", value: \.threadCount) { process in
                     Text("\(process.threadCount)")
                         .monospacedDigit()
@@ -157,6 +180,10 @@ struct ProcessView: View {
             .contextMenu(forSelectionType: ProcessItem.ID.self) { selection in
                 if let pid = selection.first,
                    let process = monitor.processes.first(where: { $0.pid == pid }) {
+                    Button("Get Info (⌘I)") {
+                        inspectorProcess = process
+                    }
+                    Divider()
                     Button("Terminate (⌫)") {
                         initiateTerminate()
                     }
@@ -177,7 +204,11 @@ struct ProcessView: View {
                     }
                 }
             } primaryAction: { selection in
-                // Double-click action
+                // Double-click opens the deep-dive inspector
+                if let pid = selection.first,
+                   let process = monitor.processes.first(where: { $0.pid == pid }) {
+                    inspectorProcess = process
+                }
             }
             .onDeleteCommand {
                 initiateTerminate()
@@ -211,6 +242,10 @@ struct ProcessView: View {
                 sortColumn = .cpuTotal
             } else if keyPathString.contains("cpuUsage") {
                 sortColumn = .cpu
+            } else if keyPathString.contains("energyImpact") {
+                sortColumn = .energy
+            } else if keyPathString.contains("diskTotalRate") {
+                sortColumn = .disk
             } else if keyPathString.contains("memoryUsage") {
                 sortColumn = .memory
             } else if keyPathString.contains("name") {
@@ -229,7 +264,10 @@ struct ProcessView: View {
         }
         .background(
             KeyboardShortcutHandler(
-                onCommandBackspace: { initiateForceKill() }
+                onCommandBackspace: { initiateForceKill() },
+                onCommandI: {
+                    if let process = selectedProcessItem { inspectorProcess = process }
+                }
             )
         )
         .sheet(isPresented: $showTerminateConfirm) {
@@ -268,6 +306,10 @@ struct ProcessView: View {
         } message: {
             Text(errorMessage)
         }
+        .sheet(item: $inspectorProcess) { process in
+            ProcessInspectorSheet(initialProcess: process)
+                .environmentObject(monitor)
+        }
     }
 
     private func initiateTerminate() {
@@ -350,6 +392,17 @@ struct ProcessView: View {
         return .primary
     }
 
+    private func energyColor(_ impact: Double) -> Color {
+        if impact > 50 {
+            return .red
+        } else if impact > 20 {
+            return .orange
+        } else if impact > 8 {
+            return .yellow
+        }
+        return .primary
+    }
+
     private func stateColor(_ state: ProcessState) -> Color {
         switch state {
         case .running: return .green
@@ -441,28 +494,39 @@ struct ConfirmationSheet: View {
 
 struct KeyboardShortcutHandler: NSViewRepresentable {
     let onCommandBackspace: () -> Void
+    var onCommandI: (() -> Void)? = nil
 
     func makeNSView(context: Context) -> NSView {
         let view = KeyCaptureView()
         view.onCommandBackspace = onCommandBackspace
+        view.onCommandI = onCommandI
         return view
     }
 
     func updateNSView(_ nsView: NSView, context: Context) {
         if let view = nsView as? KeyCaptureView {
             view.onCommandBackspace = onCommandBackspace
+            view.onCommandI = onCommandI
         }
     }
 
     class KeyCaptureView: NSView {
         var onCommandBackspace: (() -> Void)?
+        var onCommandI: (() -> Void)?
 
         override func performKeyEquivalent(with event: NSEvent) -> Bool {
-            // Backspace = keyCode 51
-            if event.keyCode == 51 && event.modifierFlags.contains(.command) {
+            guard event.modifierFlags.contains(.command) else {
+                return super.performKeyEquivalent(with: event)
+            }
+            // Backspace = keyCode 51, "i" = keyCode 34
+            if event.keyCode == 51 {
                 onCommandBackspace?()
                 return true
             }
+            if event.keyCode == 34 {
+                onCommandI?()
+                return true
+            }
             return super.performKeyEquivalent(with: event)
         }
     }

TopManagerTests/ProcessDataTests.swift

@@ -0,0 +1,95 @@
+import XCTest
+@testable import TopManager
+
+final class ProcessDataTests: XCTestCase {
+
+    // MARK: - KERN_PROCARGS2 parsing
+
+    private func buildProcArgsBuffer(argc: Int32, path: String, args: [String], env: [String]) -> [UInt8] {
+        var bytes: [UInt8] = [
+            UInt8(argc & 0xff),
+            UInt8((argc >> 8) & 0xff),
+            UInt8((argc >> 16) & 0xff),
+            UInt8((argc >> 24) & 0xff)
+        ]
+        bytes += Array(path.utf8) + [0]
+        bytes += [0, 0] // NUL padding before argv[0]
+        for a in args { bytes += Array(a.utf8) + [0] }
+        for e in env { bytes += Array(e.utf8) + [0] }
+        return bytes
+    }
+
+    func testProcArgsParseExtractsPathAndArgs() {
+        let buffer = buildProcArgsBuffer(argc: 2, path: "/bin/foo",
+                                         args: ["/bin/foo", "--flag"],
+                                         env: ["PATH=/usr/bin"])
+        let parsed = ProcArgs.parse(buffer)
+        XCTAssertEqual(parsed?.path, "/bin/foo")
+        XCTAssertEqual(parsed?.args, ["/bin/foo", "--flag"])
+    }
+
+    func testProcArgsParseStopsAtArgcAndIgnoresEnv() {
+        // argc=1 → only the first arg is returned, env is not leaked into args
+        let buffer = buildProcArgsBuffer(argc: 1, path: "/usr/bin/x",
+                                         args: ["/usr/bin/x"],
+                                         env: ["SECRET=shh"])
+        let parsed = ProcArgs.parse(buffer)
+        XCTAssertEqual(parsed?.args, ["/usr/bin/x"])
+        XCTAssertFalse(parsed?.args.contains { $0.contains("SECRET") } ?? true)
+    }
+
+    func testProcArgsParseZeroArgc() {
+        let buffer = buildProcArgsBuffer(argc: 0, path: "/bin/x", args: [], env: [])
+        let parsed = ProcArgs.parse(buffer)
+        XCTAssertEqual(parsed?.path, "/bin/x")
+        XCTAssertEqual(parsed?.args, [])
+    }
+
+    func testProcArgsParseTooShortReturnsNil() {
+        XCTAssertNil(ProcArgs.parse([1, 2, 3]))
+    }
+
+    // MARK: - Energy model
+
+    func testEnergyImpactMonotonicInCPU() {
+        XCTAssertGreaterThan(
+            EnergyModel.impact(cpuPercent: 50, idleWakeupsPerSec: 0),
+            EnergyModel.impact(cpuPercent: 10, idleWakeupsPerSec: 0)
+        )
+    }
+
+    func testEnergyImpactMonotonicInWakeups() {
+        XCTAssertGreaterThan(
+            EnergyModel.impact(cpuPercent: 10, idleWakeupsPerSec: 500),
+            EnergyModel.impact(cpuPercent: 10, idleWakeupsPerSec: 0)
+        )
+    }
+
+    func testEnergyImpactClampsNegativeInputsToZero() {
+        XCTAssertEqual(EnergyModel.impact(cpuPercent: -5, idleWakeupsPerSec: -100), 0, accuracy: 0.0001)
+    }
+
+    func testEnergyImpactEqualsCPUWhenNoWakeups() {
+        XCTAssertEqual(EnergyModel.impact(cpuPercent: 33, idleWakeupsPerSec: 0), 33, accuracy: 0.0001)
+    }
+
+    // MARK: - ProcessItem derived + equality
+
+    func testDiskTotalRateSumsReadAndWrite() {
+        let p = ProcessItem(pid: 1, name: "a", user: "u", cpuUsage: 0, cpuUsageTotal: 0,
+                            memoryUsage: 0, threadCount: 0, state: .running, icon: nil,
+                            parentPid: 0, startTime: nil, diskReadRate: 100, diskWriteRate: 50)
+        XCTAssertEqual(p.diskTotalRate, 150)
+    }
+
+    func testEqualityDetectsEnergyChange() {
+        func make(energy: Double) -> ProcessItem {
+            ProcessItem(pid: 1, name: "a", user: "u", cpuUsage: 1, cpuUsageTotal: 1,
+                        memoryUsage: 1, threadCount: 1, state: .running, icon: nil,
+                        parentPid: 0, startTime: nil, energyImpact: energy)
+        }
+        // Table refresh relies on == seeing energy/disk changes.
+        XCTAssertNotEqual(make(energy: 5), make(energy: 9))
+        XCTAssertEqual(make(energy: 5), make(energy: 5))
+    }
+}