feat(memory): implement MMMemoryTelemetryProvider with Mach VM breakdown, swap, and pressure (Issue #8)

MacMonitor.xcodeproj/project.pbxproj

@@ -12,10 +12,12 @@
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 		4419FE7554489B23976E2970 /* MMCPULoadProvider.m in Sources */ = {isa = PBXBuildFile; fileRef = D68FC8100D08DB6202F46339 /* MMCPULoadProvider.m */; };
+		6201FD599FED061F6C736E8B /* MMMemoryTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 099DCF7EF03A58ADA40A94A1 /* MMMemoryTests.swift */; };
 		88387CDAE2AC1CC74EF89B57 /* MacMonitorApp.swift in Sources */ = {isa = PBXBuildFile; fileRef = ADEA6BD38BA8D887B1DB64A9 /* MacMonitorApp.swift */; };
 		9BCE74C5454F81EF80492E75 /* MacMonitorTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 2EC3EDFCD5C50CB352FCED87 /* MacMonitorTests.swift */; };
 		A7609CE56D49EC3419987468 /* SystemTelemetryStore.swift in Sources */ = {isa = PBXBuildFile; fileRef = E4B4E94FB2886C60D5548A2A /* SystemTelemetryStore.swift */; };
 		A9FCAEC0BF27A419DB148C4A /* ContentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = E142AE61F9B87757997870DD /* ContentView.swift */; };
+		B9C2D6574E808B517BA34C83 /* MMMemoryTelemetryProvider.m in Sources */ = {isa = PBXBuildFile; fileRef = 991AEEAF262F3C6BE930BC77 /* MMMemoryTelemetryProvider.m */; };
 		CD91FC663B19DA1FEA3D49D7 /* MMAppleSMCClient.m in Sources */ = {isa = PBXBuildFile; fileRef = 5555436CD3CB8A73F5D6504F /* MMAppleSMCClient.m */; };
 		EAFAF5A10502D4ACC64F4720 /* MMTelemetryCoordinator.m in Sources */ = {isa = PBXBuildFile; fileRef = F9F9AD1268F906761032AF4D /* MMTelemetryCoordinator.m */; };
 		EC9FA3E4A119277B89E73F8D /* MMSMCTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 940D608A1AF80F75584E744E /* MMSMCTests.swift */; };
@@ -33,6 +35,8 @@
 
 /* Begin PBXFileReference section */
 		007F48A5A599AB4E8D216D16 /* IOKit.framework */ = {isa = PBXFileReference; lastKnownFileType = wrapper.framework; name = IOKit.framework; path = System/Library/Frameworks/IOKit.framework; sourceTree = SDKROOT; };
+		0130BD1E18972DF9E2955334 /* MMMemoryTelemetryProvider.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MMMemoryTelemetryProvider.h; sourceTree = "<group>"; };
+		099DCF7EF03A58ADA40A94A1 /* MMMemoryTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MMMemoryTests.swift; sourceTree = "<group>"; };
 		1AD9EEE571CD904BBCD1C96B /* MMSMCParser.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MMSMCParser.h; sourceTree = "<group>"; };
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 		2EC3EDFCD5C50CB352FCED87 /* MacMonitorTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MacMonitorTests.swift; sourceTree = "<group>"; };
@@ -47,6 +51,7 @@
 		726005CB5A6C86E7D80D3CA0 /* MMAppleSMCClient.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MMAppleSMCClient.h; sourceTree = "<group>"; };
 		8FBB436F3D9472194D8C6EDD /* MMSMCDefines.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = MMSMCDefines.h; sourceTree = "<group>"; };
 		940D608A1AF80F75584E744E /* MMSMCTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MMSMCTests.swift; sourceTree = "<group>"; };
+		991AEEAF262F3C6BE930BC77 /* MMMemoryTelemetryProvider.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MMMemoryTelemetryProvider.m; sourceTree = "<group>"; };
 		ADEA6BD38BA8D887B1DB64A9 /* MacMonitorApp.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = MacMonitorApp.swift; sourceTree = "<group>"; };
 		D68FC8100D08DB6202F46339 /* MMCPULoadProvider.m */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.objc; path = MMCPULoadProvider.m; sourceTree = "<group>"; };
 		E142AE61F9B87757997870DD /* ContentView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContentView.swift; sourceTree = "<group>"; };
@@ -131,6 +136,7 @@
 			isa = PBXGroup;
 			children = (
 				78383CED205BCA772701AE48 /* CPU */,
+				EE2F5EFC9DC33CEDA79A131F /* Memory */,
 			);
 			path = Telemetry;
 			sourceTree = "<group>";
@@ -157,6 +163,7 @@
 			children = (
 				2EC3EDFCD5C50CB352FCED87 /* MacMonitorTests.swift */,
 				4CE92B1A8D7FDBB6499448E1 /* MMCPULoadTests.swift */,
+				099DCF7EF03A58ADA40A94A1 /* MMMemoryTests.swift */,
 				940D608A1AF80F75584E744E /* MMSMCTests.swift */,
 			);
 			path = Tests;
@@ -183,6 +190,15 @@
 			name = Frameworks;
 			sourceTree = "<group>";
 		};
+		EE2F5EFC9DC33CEDA79A131F /* Memory */ = {
+			isa = PBXGroup;
+			children = (
+				0130BD1E18972DF9E2955334 /* MMMemoryTelemetryProvider.h */,
+				991AEEAF262F3C6BE930BC77 /* MMMemoryTelemetryProvider.m */,
+			);
+			path = Memory;
+			sourceTree = "<group>";
+		};
 /* End PBXGroup section */
 
 /* Begin PBXNativeTarget section */
@@ -259,6 +275,7 @@
 			buildActionMask = 2147483647;
 			files = (
 				160334CC765E091A7CBE21AA /* MMCPULoadTests.swift in Sources */,
+				6201FD599FED061F6C736E8B /* MMMemoryTests.swift in Sources */,
 				EC9FA3E4A119277B89E73F8D /* MMSMCTests.swift in Sources */,
 				9BCE74C5454F81EF80492E75 /* MacMonitorTests.swift in Sources */,
 			);
@@ -271,6 +288,7 @@
 				A9FCAEC0BF27A419DB148C4A /* ContentView.swift in Sources */,
 				CD91FC663B19DA1FEA3D49D7 /* MMAppleSMCClient.m in Sources */,
 				4419FE7554489B23976E2970 /* MMCPULoadProvider.m in Sources */,
+				B9C2D6574E808B517BA34C83 /* MMMemoryTelemetryProvider.m in Sources */,
 				1B3F1C8ABF0ADFAA290FF6F6 /* MMSMCParser.m in Sources */,
 				EAFAF5A10502D4ACC64F4720 /* MMTelemetryCoordinator.m in Sources */,
 				88387CDAE2AC1CC74EF89B57 /* MacMonitorApp.swift in Sources */,

Sources/Bridging/MacMonitor-Bridging-Header.h

@@ -13,5 +13,6 @@
 
 // Telemetry Providers
 #import "MMCPULoadProvider.h"
+#import "MMMemoryTelemetryProvider.h"
 
 #endif /* MacMonitor_Bridging_Header_h */

Sources/Telemetry/Memory/MMMemoryTelemetryProvider.h

@@ -0,0 +1,32 @@
+#ifndef MMMemoryTelemetryProvider_h
+#define MMMemoryTelemetryProvider_h
+
+#import <Foundation/Foundation.h>
+#import <mach/mach.h>
+#import <sys/sysctl.h>
+#import "MMTelemetryProvider.h"
+
+NS_ASSUME_NONNULL_BEGIN
+
+/**
+ * MMMemoryTelemetryProvider
+ * Samples Mach virtual memory statistics, wired/active/inactive/compressed memory allocations,
+ * swap usage, and system-wide memory pressure levels.
+ */
+@interface MMMemoryTelemetryProvider : NSObject <MMTelemetryProvider>
+
+@property (nonatomic, readonly) uint64_t totalPhysicalMemoryBytes;
+
+/**
+ * Deterministic helper method for unit testing VM metric calculations.
+ */
++ (NSDictionary<NSString *, id> *)calculateMemoryMetricsWithVMInfo:(const vm_statistics64_data_t *)vmInfo
+                                                           pageSize:(vm_size_t)pageSize
+                                                   totalPhysicalRAM:(uint64_t)totalRAM
+                                                          swapUsage:(const struct xsw_usage * _Nullable)swap;
+
+@end
+
+NS_ASSUME_NONNULL_END
+
+#endif /* MMMemoryTelemetryProvider_h */

Sources/Telemetry/Memory/MMMemoryTelemetryProvider.m

@@ -0,0 +1,135 @@
+#import "MMMemoryTelemetryProvider.h"
+#import <sys/sysctl.h>
+
+@interface MMMemoryTelemetryProvider () {
+    uint64_t _totalPhysicalMemoryBytes;
+    vm_size_t _pageSize;
+}
+@end
+
+@implementation MMMemoryTelemetryProvider
+
+- (instancetype)init {
+    self = [super init];
+    if (self) {
+        // Read physical memory size
+        uint64_t memSize = 0;
+        size_t size = sizeof(memSize);
+        sysctlbyname("hw.memsize", &memSize, &size, NULL, 0);
+        _totalPhysicalMemoryBytes = memSize;
+        
+        // Read virtual memory page size
+        vm_size_t pSize = 4096;
+        host_page_size(mach_host_self(), &pSize);
+        _pageSize = pSize;
+    }
+    return self;
+}
+
+- (MMTelemetryDomain)domain {
+    return MMTelemetryDomainMemory;
+}
+
+- (NSString *)providerIdentifier {
+    return @"com.i3omb.macmonitor.telemetry.memory";
+}
+
+- (BOOL)isAvailable {
+    return YES;
+}
+
+- (uint64_t)totalPhysicalMemoryBytes {
+    return _totalPhysicalMemoryBytes;
+}
+
++ (NSDictionary<NSString *, id> *)calculateMemoryMetricsWithVMInfo:(const vm_statistics64_data_t *)vmInfo
+                                                           pageSize:(vm_size_t)pageSize
+                                                   totalPhysicalRAM:(uint64_t)totalRAM
+                                                          swapUsage:(const struct xsw_usage * _Nullable)swap {
+    if (!vmInfo) return @{};
+    
+    uint64_t appMemory = (vmInfo->internal_page_count > vmInfo->purgeable_count)
+        ? (uint64_t)(vmInfo->internal_page_count - vmInfo->purgeable_count) * pageSize
+        : 0;
+    uint64_t wired = (uint64_t)vmInfo->wire_count * pageSize;
+    uint64_t compressed = (uint64_t)vmInfo->compressor_page_count * pageSize;
+    uint64_t used = appMemory + wired + compressed;
+    
+    uint64_t freeRAM = (uint64_t)vmInfo->free_count * pageSize;
+    uint64_t purgeable = (uint64_t)vmInfo->purgeable_count * pageSize;
+    uint64_t active = (uint64_t)vmInfo->active_count * pageSize;
+    uint64_t inactive = (uint64_t)vmInfo->inactive_count * pageSize;
+    
+    // Calculate Memory Pressure percentage
+    uint64_t availableForUse = (uint64_t)(vmInfo->free_count + vmInfo->inactive_count) * pageSize;
+    double pressurePct = 0.0;
+    if (totalRAM > 0) {
+        pressurePct = (1.0 - ((double)availableForUse / (double)totalRAM)) * 100.0;
+        if (pressurePct < 0.0) pressurePct = 0.0;
+        if (pressurePct > 100.0) pressurePct = 100.0;
+    }
+    
+    NSString *pressureStatus = @"Normal";
+    if (pressurePct >= 80.0) {
+        pressureStatus = @"Critical";
+    } else if (pressurePct >= 60.0) {
+        pressureStatus = @"Warning";
+    }
+    
+    uint64_t swapTotal = swap ? swap->xsu_total : 0;
+    uint64_t swapUsed = swap ? swap->xsu_used : 0;
+    uint64_t swapFree = swap ? swap->xsu_avail : 0;
+    
+    return @{
+        @"totalBytes": @(totalRAM),
+        @"usedBytes": @(used),
+        @"freeBytes": @(freeRAM),
+        @"appMemoryBytes": @(appMemory),
+        @"wiredBytes": @(wired),
+        @"compressedBytes": @(compressed),
+        @"purgeableBytes": @(purgeable),
+        @"activeBytes": @(active),
+        @"inactiveBytes": @(inactive),
+        @"memoryPressurePercent": @(pressurePct),
+        @"memoryPressureStatus": pressureStatus,
+        @"swapTotalBytes": @(swapTotal),
+        @"swapUsedBytes": @(swapUsed),
+        @"swapFreeBytes": @(swapFree)
+    };
+}
+
+- (nullable NSDictionary<NSString *, id> *)sampleTelemetryWithError:(NSError **)error {
+    vm_statistics64_data_t vmInfo = {0};
+    mach_msg_type_number_t count = HOST_VM_INFO64_COUNT;
+    
+    kern_return_t kr = host_statistics64(
+        mach_host_self(),
+        HOST_VM_INFO64,
+        (host_info64_t)&vmInfo,
+        &count
+    );
+    
+    if (kr != KERN_SUCCESS) {
+        if (error) {
+            *error = [NSError errorWithDomain:@"com.i3omb.MacMonitor.Memory"
+                                         code:kr
+                                     userInfo:@{NSLocalizedDescriptionKey: @"host_statistics64 failed to sample VM metrics"}];
+        }
+        return nil;
+    }
+    
+    // Read swap usage
+    struct xsw_usage swap = {0};
+    size_t swapSize = sizeof(swap);
+    struct xsw_usage *swapPtr = NULL;
+    if (sysctlbyname("vm.swapusage", &swap, &swapSize, NULL, 0) == 0) {
+        swapPtr = &swap;
+    }
+    
+    return [MMMemoryTelemetryProvider calculateMemoryMetricsWithVMInfo:&vmInfo
+                                                              pageSize:_pageSize
+                                                      totalPhysicalRAM:_totalPhysicalMemoryBytes
+                                                             swapUsage:swapPtr];
+}
+
+@end

Tests/MMMemoryTests.swift

@@ -0,0 +1,64 @@
+import XCTest
+@testable import MacMonitor
+
+final class MMMemoryTests: XCTestCase {
+    
+    func testMemoryMetricCalculation() {
+        var vmInfo = vm_statistics64_data_t()
+        let pageSize: vm_size_t = 4096
+        let totalRAM: UInt64 = 16 * 1024 * 1024 * 1024 // 16 GB
+        
+        // 1GB wired (262144 pages), 2GB app (524288 pages), 1GB compressed (262144 pages)
+        vmInfo.wire_count = 262_144
+        vmInfo.internal_page_count = 524_288
+        vmInfo.purgeable_count = 0
+        vmInfo.compressor_page_count = 262_144
+        vmInfo.active_count = 524_288
+        vmInfo.inactive_count = 1_048_576 // 4GB
+        vmInfo.free_count = 2_097_152     // 8GB
+        
+        var swap = xsw_usage()
+        swap.xsu_total = 2 * 1024 * 1024 * 1024
+        swap.xsu_used = 512 * 1024 * 1024
+        swap.xsu_avail = swap.xsu_total - swap.xsu_used
+        
+        withUnsafePointer(to: vmInfo) { vmPtr in
+            withUnsafePointer(to: swap) { swapPtr in
+                let metrics = MMMemoryTelemetryProvider.calculateMemoryMetrics(
+                    withVMInfo: vmPtr,
+                    pageSize: pageSize,
+                    totalPhysicalRAM: totalRAM,
+                    swapUsage: swapPtr
+                )
+                
+                let wired = metrics["wiredBytes"] as? UInt64 ?? 0
+                let app = metrics["appMemoryBytes"] as? UInt64 ?? 0
+                let compressed = metrics["compressedBytes"] as? UInt64 ?? 0
+                let used = metrics["usedBytes"] as? UInt64 ?? 0
+                let pressureStatus = metrics["memoryPressureStatus"] as? String ?? ""
+                
+                XCTAssertEqual(wired, 1024 * 1024 * 1024)
+                XCTAssertEqual(app, 2 * 1024 * 1024 * 1024)
+                XCTAssertEqual(compressed, 1024 * 1024 * 1024)
+                XCTAssertEqual(used, 4 * 1024 * 1024 * 1024)
+                XCTAssertEqual(pressureStatus, "Normal")
+            }
+        }
+    }
+    
+    func testLiveMemoryProvider() throws {
+        let provider = MMMemoryTelemetryProvider()
+        XCTAssertTrue(provider.isAvailable)
+        XCTAssertEqual(provider.domain, .memory)
+        XCTAssertGreaterThan(provider.totalPhysicalMemoryBytes, 0)
+        
+        let sample = try provider.sampleTelemetry()
+        let total = sample["totalBytes"] as? UInt64 ?? 0
+        let used = sample["usedBytes"] as? UInt64 ?? 0
+        let free = sample["freeBytes"] as? UInt64 ?? 0
+        
+        XCTAssertGreaterThan(total, 0)
+        XCTAssertGreaterThan(used, 0)
+        XCTAssertGreaterThanOrEqual(free, 0)
+    }
+}