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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Thu, 29 Apr 2010 09:59:17 +0000 (UTC)
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Subject: svn commit: r207365 - head/sys/vm
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Author: kib
Date: Thu Apr 29 09:59:16 2010
New Revision: 207365
URL: http://svn.freebsd.org/changeset/base/207365

Log:
  When doing kstack swapin, read as much pages in one run as possible.
  
  Suggested and reviewed by:	alc (previous version)
  Tested by:	pho
  MFC after:	2 weeks

Modified:
  head/sys/vm/vm_glue.c

Modified: head/sys/vm/vm_glue.c
==============================================================================
--- head/sys/vm/vm_glue.c	Thu Apr 29 09:57:25 2010	(r207364)
+++ head/sys/vm/vm_glue.c	Thu Apr 29 09:59:16 2010	(r207365)
@@ -538,23 +538,37 @@ static void
 vm_thread_swapin(struct thread *td)
 {
 	vm_object_t ksobj;
-	vm_page_t m, ma[KSTACK_MAX_PAGES];
-	int i, pages, rv;
+	vm_page_t ma[KSTACK_MAX_PAGES];
+	int i, j, k, pages, rv;
 
 	pages = td->td_kstack_pages;
 	ksobj = td->td_kstack_obj;
 	VM_OBJECT_LOCK(ksobj);
-	for (i = 0; i < pages; i++) {
-		m = vm_page_grab(ksobj, i, VM_ALLOC_NORMAL | VM_ALLOC_RETRY |
+	for (i = 0; i < pages; i++)
+		ma[i] = vm_page_grab(ksobj, i, VM_ALLOC_NORMAL | VM_ALLOC_RETRY |
 		    VM_ALLOC_WIRED);
-		if (m->valid != VM_PAGE_BITS_ALL) {
-			rv = vm_pager_get_pages(ksobj, &m, 1, 0);
+	for (i = 0; i < pages; i++) {
+		if (ma[i]->valid != VM_PAGE_BITS_ALL) {
+			KASSERT(ma[i]->oflags & VPO_BUSY,
+			    ("lost busy 1"));
+			vm_object_pip_add(ksobj, 1);
+			for (j = i + 1; j < pages; j++) {
+				KASSERT(ma[j]->valid == VM_PAGE_BITS_ALL ||
+				    (ma[j]->oflags & VPO_BUSY),
+				    ("lost busy 2"));
+				if (ma[j]->valid == VM_PAGE_BITS_ALL)
+					break;
+			}
+			rv = vm_pager_get_pages(ksobj, ma + i, j - i, 0);
 			if (rv != VM_PAGER_OK)
-				panic("vm_thread_swapin: cannot get kstack for proc: %d", td->td_proc->p_pid);
-			m = vm_page_lookup(ksobj, i);
-		}
-		ma[i] = m;
-		vm_page_wakeup(m);
+	panic("vm_thread_swapin: cannot get kstack for proc: %d",
+				    td->td_proc->p_pid);
+			vm_object_pip_wakeup(ksobj);
+			for (k = i; k < j; k++)
+				ma[k] = vm_page_lookup(ksobj, k);
+			vm_page_wakeup(ma[i]);
+		} else if (ma[i]->oflags & VPO_BUSY)
+			vm_page_wakeup(ma[i]);
 	}
 	VM_OBJECT_UNLOCK(ksobj);
 	pmap_qenter(td->td_kstack, ma, pages);