Attempt to schedule other processors more often by waking them up with a context switch when a process is created

src/arch/x86_64/idt.rs

@@ -3,6 +3,7 @@ use x86::current::irq::IdtEntry as X86IdtEntry;
 use x86::shared::dtables::{self, DescriptorTablePointer};
 
 use interrupt::*;
+use ipi::IpiKind;
 
 pub static mut INIT_IDTR: DescriptorTablePointer<X86IdtEntry> = DescriptorTablePointer {
     limit: 0,
@@ -69,9 +70,10 @@ pub unsafe fn init_paging() {
     IDT[47].set_func(irq::ata2);
 
     // Set IPI handlers
-    IDT[0x40].set_func(ipi::wakeup);
-    IDT[0x41].set_func(ipi::tlb);
-    IDT[0x42].set_func(ipi::pit);
+    IDT[IpiKind::Wakeup as usize].set_func(ipi::wakeup);
+    IDT[IpiKind::Switch as usize].set_func(ipi::switch);
+    IDT[IpiKind::Tlb as usize].set_func(ipi::tlb);
+    IDT[IpiKind::Pit as usize].set_func(ipi::pit);
 
     // Set syscall function
     IDT[0x80].set_func(syscall::syscall);

src/arch/x86_64/interrupt/ipi.rs

@@ -8,6 +8,17 @@ interrupt!(wakeup, {
     LOCAL_APIC.eoi();
 });
 
+interrupt!(tlb, {
+    LOCAL_APIC.eoi();
+    //TODO
+});
+
+interrupt!(switch, {
+    LOCAL_APIC.eoi();
+
+    let _ = context::switch();
+});
+
 interrupt!(pit, {
     LOCAL_APIC.eoi();
 
@@ -15,7 +26,3 @@ interrupt!(pit, {
         let _ = context::switch();
     }
 });
-
-interrupt!(tlb, {
-    LOCAL_APIC.eoi();
-});

src/arch/x86_64/ipi.rs

@@ -3,7 +3,8 @@
 pub enum IpiKind {
     Wakeup = 0x40,
     Tlb = 0x41,
-    Pit = 0x42,
+    Switch = 0x42,
+    Pit = 0x43,
 }
 
 #[derive(Clone, Copy, Debug)]

src/syscall/process.rs

@@ -17,6 +17,7 @@ use context::{ContextId, WaitpidKey};
 use context::file::FileDescriptor;
 #[cfg(not(feature="doc"))]
 use elf::{self, program_header};
+use ipi::{ipi, IpiKind, IpiTarget};
 use scheme::FileHandle;
 use syscall;
 use syscall::data::{SigAction, Stat};
@@ -477,6 +478,9 @@ pub fn clone(flags: usize, stack_base: usize) -> Result<ContextId> {
         }
     }
 
+    // Race to pick up the new process!
+    ipi(IpiKind::Switch, IpiTarget::Other);
+
     let _ = unsafe { context::switch() };
 
     Ok(pid)