Changes to exit handling.

cpu_exit no longer frees the vmspace and u-area. This is now handled by a
separate kernel thread "reaper". This is to avoid sleeping locks in the
critical path of cpu_exit where we're not allowed to sleep.

From NetBSD

2 files changed, 22 insertions, 37 deletions

diff --git a/sys/arch/i386/i386/locore.s b/sys/arch/i386/i386/locore.s
index 5600f8c33c3..05c0f3dc1c0 100644
--- a/sys/arch/i386/i386/locore.s
+++ b/sys/arch/i386/i386/locore.s
@@ -1,4 +1,4 @@
-/*	$OpenBSD: locore.s,v 1.50 2000/05/01 00:43:41 mickey Exp $	*/
+/*	$OpenBSD: locore.s,v 1.51 2000/06/05 11:02:54 art Exp $	*/
 /*	$NetBSD: locore.s,v 1.145 1996/05/03 19:41:19 christos Exp $	*/
 
 /*-
@@ -1943,24 +1943,12 @@ ENTRY(switch_exit)
 	/* Interrupts are okay again. */
 	sti
 
-	/* Thoroughly nuke the old process's resources. */
-	pushl	P_ADDR(%edi)
-	call	_tss_free
-	pushl	P_VMSPACE(%edi)
-#if defined(UVM)
-	call	_C_LABEL(uvmspace_free)
-#else
-	call	_vmspace_free
-#endif
-	pushl	$USPACE
-	pushl	P_ADDR(%edi)
-	pushl	_kernel_map
-#if defined(UVM)
-	call	_C_LABEL(uvm_km_free)
-#else
-	call	_kmem_free
-#endif
-	addl	$20,%esp
+	/*
+	 * Schedule the dead process's vmspace and stack to be freed.
+	 */
+	pushl   %edi			/* exit2(p) */
+	call    _C_LABEL(exit2)
+	addl    $4,%esp
 
 	/* Jump into cpu_switch() with the right state. */
 	movl	%ebx,%esi
diff --git a/sys/arch/i386/i386/vm_machdep.c b/sys/arch/i386/i386/vm_machdep.c
index 78c3e5fa531..5ba85422128 100644
--- a/sys/arch/i386/i386/vm_machdep.c
+++ b/sys/arch/i386/i386/vm_machdep.c
@@ -1,4 +1,4 @@
-/*	$OpenBSD: vm_machdep.c,v 1.17 1999/08/17 10:32:16 niklas Exp $	*/
+/*	$OpenBSD: vm_machdep.c,v 1.18 2000/06/05 11:02:54 art Exp $	*/
 /*	$NetBSD: vm_machdep.c,v 1.61 1996/05/03 19:42:35 christos Exp $	*/
 
 /*-
@@ -206,29 +206,12 @@ void
 cpu_exit(p)
 	register struct proc *p;
 {
-#ifdef USER_LDT
-	struct pcb *pcb;
-#endif
-	struct vmspace *vm;
-
 #if NNPX > 0
 	/* If we were using the FPU, forget about it. */
 	if (npxproc == p)
 		npxproc = 0;
 #endif
 
-#ifdef USER_LDT
-	pcb = &p->p_addr->u_pcb;
-	if (pcb->pcb_flags & PCB_USER_LDT)
-		i386_user_cleanup(pcb);
-#endif
-
-	vm = p->p_vmspace;
-#if !defined(UVM)
-	if (vm->vm_refcnt == 1)
-		vm_map_remove(&vm->vm_map, VM_MIN_ADDRESS, VM_MAXUSER_ADDRESS);
-#endif
-
 #if defined(UVM)
 	uvmexp.swtch++;
 #else
@@ -237,6 +220,20 @@ cpu_exit(p)
 	switch_exit(p);
 }
 
+void
+cpu_wait(p)
+	struct proc *p;
+{
+	struct pcb *pcb;
+
+	pcb = &p->p_addr->u_pcb;
+#ifdef USER_LDT
+	if (pcb->pcb_flags & PCB_USER_LDT)
+		i386_user_cleanup(pcb);
+#endif
+	tss_free(pcb);
+}
+
 /*
  * Dump the machine specific segment at the start of a core dump.
  */