Author: alc
Date: Tue Oct 25 23:19:57 2011
New Revision: 226763
URL: http://svn.freebsd.org/changeset/base/226763
Log:
MFC r211937
Add the MAP_PREFAULT_READ option to mmap(2).
Modified:
stable/8/sys/sys/mman.h
stable/8/sys/sys/param.h
stable/8/sys/vm/vm_mmap.c
Directory Properties:
stable/8/sys/ (props changed)
stable/8/sys/amd64/include/xen/ (props changed)
stable/8/sys/cddl/contrib/opensolaris/ (props changed)
stable/8/sys/contrib/dev/acpica/ (props changed)
stable/8/sys/contrib/pf/ (props changed)
Modified: stable/8/sys/sys/mman.h
==============================================================================
--- stable/8/sys/sys/mman.h Tue Oct 25 23:17:53 2011 (r226762)
+++ stable/8/sys/sys/mman.h Tue Oct 25 23:19:57 2011 (r226763)
@@ -87,6 +87,7 @@
* Extended flags
*/
#define MAP_NOCORE 0x00020000 /* dont include these pages in a
coredump */
+#define MAP_PREFAULT_READ 0x00040000 /* prefault mapping for reading */
#endif /* __BSD_VISIBLE */
#if __POSIX_VISIBLE >= 199309
Modified: stable/8/sys/sys/param.h
==============================================================================
--- stable/8/sys/sys/param.h Tue Oct 25 23:17:53 2011 (r226762)
+++ stable/8/sys/sys/param.h Tue Oct 25 23:19:57 2011 (r226763)
@@ -58,7 +58,7 @@
* in the range 5 to 9.
*/
#undef __FreeBSD_version
-#define __FreeBSD_version 802512 /* Master, propagated to newvers */
+#define __FreeBSD_version 802513 /* Master, propagated to newvers */
#ifdef _KERNEL
#define P_OSREL_SIGWAIT 700000
Modified: stable/8/sys/vm/vm_mmap.c
==============================================================================
--- stable/8/sys/vm/vm_mmap.c Tue Oct 25 23:17:53 2011 (r226762)
+++ stable/8/sys/vm/vm_mmap.c Tue Oct 25 23:19:57 2011 (r226763)
@@ -1388,9 +1388,10 @@ vm_mmap(vm_map_t map, vm_offset_t *addr,
*/
if (handle == 0)
foff = 0;
- } else {
+ } else if (flags & MAP_PREFAULT_READ)
+ docow = MAP_PREFAULT;
+ else
docow = MAP_PREFAULT_PARTIAL;
- }
if ((flags & (MAP_ANON|MAP_SHARED)) == 0)
docow |= MAP_COPY_ON_WRITE;
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