Collect all the (now equivalent) pmap_new_proc/pmap_dispose_proc/

pmap_swapin_proc/pmap_swapout_proc functions from the MD pmap code
and use a single equivalent MI version.  There are other cleanups
needed still.

While here, use the UMA zone hooks to keep a cache of preinitialized
proc structures handy, just like the thread system does.  This eliminates
one dependency on 'struct proc' being persistent even after being freed.
There are some comments about things that can be factored out into
ctor/dtor functions if it is worth it.  For now they are mostly just
doing statistics to get a feel of how it is working.

1 files changed, 0 insertions, 170 deletions

diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c
index 7b673e6..9e3c6c3 100644
--- a/sys/amd64/amd64/pmap.c
+++ b/sys/amd64/amd64/pmap.c
@@ -820,176 +820,6 @@ retry:
 }
 
 /*
- * Create the Uarea stack for a new process.
- * This routine directly affects the fork perf for a process.
- */
-void
-pmap_new_proc(struct proc *p)
-{
-#ifdef I386_CPU
-	int updateneeded = 0;
-#endif
-	int i;
-	vm_object_t upobj;
-	vm_offset_t up;
-	vm_page_t m;
-	pt_entry_t *ptek, oldpte;
-
-	/*
-	 * allocate object for the upage
-	 */
-	upobj = p->p_upages_obj;
-	if (upobj == NULL) {
-		upobj = vm_object_allocate(OBJT_DEFAULT, UAREA_PAGES);
-		p->p_upages_obj = upobj;
-	}
-
-	/* get a kernel virtual address for the U area for this thread */
-	up = (vm_offset_t)p->p_uarea;
-	if (up == 0) {
-		up = kmem_alloc_nofault(kernel_map, UAREA_PAGES * PAGE_SIZE);
-		if (up == 0)
-			panic("pmap_new_proc: upage allocation failed");
-		p->p_uarea = (struct user *)up;
-	}
-
-	ptek = vtopte(up);
-
-	for (i = 0; i < UAREA_PAGES; i++) {
-		/*
-		 * Get a kernel page for the uarea
-		 */
-		m = vm_page_grab(upobj, i, VM_ALLOC_NORMAL | VM_ALLOC_RETRY);
-
-		/*
-		 * Wire the page
-		 */
-		m->wire_count++;
-		cnt.v_wire_count++;
-
-		/*
-		 * Enter the page into the kernel address space.
-		 */
-		oldpte = ptek[i];
-		ptek[i] = VM_PAGE_TO_PHYS(m) | PG_RW | PG_V | pgeflag;
-		if (oldpte) {
-#ifdef I386_CPU
-			updateneeded = 1;
-#else
-			invlpg(up + i * PAGE_SIZE);
-#endif
-		}
-
-		vm_page_wakeup(m);
-		vm_page_flag_clear(m, PG_ZERO);
-		vm_page_flag_set(m, PG_MAPPED | PG_WRITEABLE);
-		m->valid = VM_PAGE_BITS_ALL;
-	}
-#ifdef I386_CPU
-	if (updateneeded)
-		invltlb();
-#endif
-}
-
-/*
- * Dispose the U-Area for a process that has exited.
- * This routine directly impacts the exit perf of a process.
- */
-void
-pmap_dispose_proc(p)
-	struct proc *p;
-{
-	int i;
-	vm_object_t upobj;
-	vm_offset_t up;
-	vm_page_t m;
-	pt_entry_t *ptek;
-
-	upobj = p->p_upages_obj;
-	up = (vm_offset_t)p->p_uarea;
-	ptek = vtopte(up);
-	for (i = 0; i < UAREA_PAGES; i++) {
-		m = vm_page_lookup(upobj, i);
-		if (m == NULL)
-			panic("pmap_dispose_proc: upage already missing?");
-		vm_page_busy(m);
-		ptek[i] = 0;
-#ifndef I386_CPU
-		invlpg(up + i * PAGE_SIZE);
-#endif
-		vm_page_unwire(m, 0);
-		vm_page_free(m);
-	}
-#ifdef I386_CPU
-	invltlb();
-#endif
-
-	/*
-	 * If the process got swapped out some of its UPAGES might have gotten
-	 * swapped.  Just get rid of the object to clean up the swap use
-	 * proactively.  NOTE! might block waiting for paging I/O to complete.
-	 */
-	if (upobj->type == OBJT_SWAP) {
-		p->p_upages_obj = NULL;
-		vm_object_deallocate(upobj);
-	}
-}
-
-/*
- * Allow the U_AREA for a process to be prejudicially paged out.
- */
-void
-pmap_swapout_proc(p)
-	struct proc *p;
-{
-	int i;
-	vm_object_t upobj;
-	vm_offset_t up;
-	vm_page_t m;
-
-	upobj = p->p_upages_obj;
-	up = (vm_offset_t)p->p_uarea;
-	for (i = 0; i < UAREA_PAGES; i++) {
-		m = vm_page_lookup(upobj, i);
-		if (m == NULL)
-			panic("pmap_swapout_proc: upage already missing?");
-		vm_page_dirty(m);
-		vm_page_unwire(m, 0);
-		pmap_kremove(up + i * PAGE_SIZE);
-	}
-}
-
-/*
- * Bring the U-Area for a specified process back in.
- */
-void
-pmap_swapin_proc(p)
-	struct proc *p;
-{
-	int i, rv;
-	vm_object_t upobj;
-	vm_offset_t up;
-	vm_page_t m;
-
-	upobj = p->p_upages_obj;
-	up = (vm_offset_t)p->p_uarea;
-	for (i = 0; i < UAREA_PAGES; i++) {
-		m = vm_page_grab(upobj, i, VM_ALLOC_NORMAL | VM_ALLOC_RETRY);
-		pmap_kenter(up + i * PAGE_SIZE, VM_PAGE_TO_PHYS(m));
-		if (m->valid != VM_PAGE_BITS_ALL) {
-			rv = vm_pager_get_pages(upobj, &m, 1, 0);
-			if (rv != VM_PAGER_OK)
-				panic("pmap_swapin_proc: cannot get upage for proc: %d\n", p->p_pid);
-			m = vm_page_lookup(upobj, i);
-			m->valid = VM_PAGE_BITS_ALL;
-		}
-		vm_page_wire(m);
-		vm_page_wakeup(m);
-		vm_page_flag_set(m, PG_MAPPED | PG_WRITEABLE);
-	}
-}
-
-/*
  * Create the kernel stack (including pcb for i386) for a new thread.
  * This routine directly affects the fork perf for a process and
  * create performance for a thread.