feat: various power and thermal optimizations, fix Printers app regression

kernel/src/Sched/Scheduler.hpp

@@ -41,7 +41,7 @@ namespace Sched {
         uint64_t savedRsp;
         uint64_t stackBase;       // Bottom of allocated kernel stack (lowest address)
         uint64_t entryPoint;
-        uint64_t sliceRemaining;  // Ticks left in current time slice
+        uint64_t sliceRemaining;  // Milliseconds left in current time slice
         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
@@ -87,8 +87,12 @@ namespace Sched {
     int Spawn(const char* vfsPath, const char* args = nullptr);
     void Schedule();
 
-    // Called from the APIC timer handler on every tick (per-CPU).
-    void Tick();
+    // True when there is runnable work somewhere in the process table.
+    bool HasReadyProcesses();
+
+    // Called from the APIC timer handler with the elapsed time for that CPU's
+    // tick interval. The BSP runs at 1 ms; APs may use a coarser interval.
+    void Tick(uint32_t elapsedMs = 1);
 
     // Get the PID of the currently running process (-1 if idle)
     int GetCurrentPid();
@@ -112,6 +116,14 @@ namespace Sched {
     // timeoutMs == 0 means wait indefinitely.
     void BlockOnObject(void* object, uint64_t timeoutMs = 0);
 
+    // BSP-only scheduler housekeeping: wake expired sleepers and reclaim
+    // terminated process resources.
+    void RunBspMaintenance();
+
+    // Return the earliest blocked sleep/object timeout deadline in ticks,
+    // or 0 when no timed waits are pending.
+    uint64_t GetNextDeadlineTick();
+
     // Wake any processes blocked on the given object.
     void WakeObjectWaiters(void* object);