feat: graphing in MTK toolkit, kernel exposes CPU time, Processes app Performance tab

kernel/src/Api/Process.hpp

@@ -107,6 +107,7 @@ namespace Montauk {
                 buf[count].name[j] = '\0';
             }
             buf[count].heapUsed = Sched::g_allocatedPages[i] * 0x1000;
+            buf[count].cpuTimeMs = proc->cpuTimeMs;
             count++;
         }
         return count;

kernel/src/Api/Syscall.hpp

@@ -407,6 +407,7 @@ namespace Montauk {
         uint8_t  _pad[3];
         char     name[64];
         uint64_t heapUsed;     // heapNext - UserHeapBase (bytes)
+        uint64_t cpuTimeMs;    // accumulated scheduler runtime
     };
 
     // Bluetooth scan result (returned by SYS_BTSCAN)

kernel/src/Sched/Scheduler.cpp

@@ -163,6 +163,7 @@ namespace Sched {
             processTable[i].stackBase = 0;
             processTable[i].entryPoint = 0;
             processTable[i].sliceRemaining = 0;
+            processTable[i].cpuTimeMs = 0;
             processTable[i].pml4Phys = 0;
             processTable[i].kernelStackTop = 0;
             processTable[i].userStackTop = 0;
@@ -353,6 +354,7 @@ namespace Sched {
         proc.stackBase = (uint64_t)kernelStackBase;
         proc.entryPoint = entry;
         proc.sliceRemaining = TimeSliceMs;
+        proc.cpuTimeMs = 0;
         proc.pml4Phys = pml4Phys;
         proc.kernelStackTop = kernelStackTop;
         proc.userStackTop = UserStackTop - 8;
@@ -638,6 +640,8 @@ namespace Sched {
             return;
         }
 
+        processTable[slot].cpuTimeMs += elapsedMs;
+
         // Check if another CPU requested this process be killed.
         // We are on the CPU running it, so ExitProcess is safe here.
         if (processTable[slot].killPending) {

kernel/src/Sched/Scheduler.hpp

@@ -42,6 +42,7 @@ namespace Sched {
         uint64_t stackBase;       // Bottom of allocated kernel stack (lowest address)
         uint64_t entryPoint;
         uint64_t sliceRemaining;  // Milliseconds left in current time slice
+        uint64_t cpuTimeMs;       // Accumulated scheduler runtime in milliseconds
         uint64_t pml4Phys;        // Physical address of per-process PML4
         uint64_t kernelStackTop;  // Top of kernel stack (for TSS RSP0 / SYSCALL)
         uint64_t userStackTop;    // User-space stack top