Date: Tue, 25 Oct 2011 23:19:57 +0000 (UTC) From: Alan Cox <alc@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r226763 - in stable/8/sys: sys vm Message-ID: <201110252319.p9PNJv5J021272@svn.freebsd.org>
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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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