Date: Sat, 19 Jul 2003 04:30:16 -0700 (PDT) From: Bruce M Simpson <bms@spc.org> To: freebsd-standards@FreeBSD.org Subject: Re: standards/54223: [PATCH] Add mlockall(), munlockall() syscalls to -CURRENT Message-ID: <200307191130.h6JBUGMp098758@freefall.freebsd.org>
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The following reply was made to PR standards/54223; it has been noted by GNATS.
From: Bruce M Simpson <bms@spc.org>
To: FreeBSD-gnats-submit@FreeBSD.org, freebsd-standards@FreeBSD.org
Cc: alc@freebsd.org
Subject: Re: standards/54223: [PATCH] Add mlockall(), munlockall() syscalls to -CURRENT
Date: Sat, 19 Jul 2003 12:19:52 +0100
--OgqxwSJOaUobr8KG
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
Here is an updated patch which fixes some issues.
BMS
--OgqxwSJOaUobr8KG
Content-Type: text/plain; charset=us-ascii
Content-Disposition: attachment; filename="mlockall.patch"
Revised patch to add mlockall()/munlockall() to FreeBSD 5.1-RELEASE.
- Believed to back out of allocations and locks correctly
(tested with WITNESS, MUTEX_PROFILING, INVARIANTS and DIAGNOSTIC).
- Inspected at the vmstat, top and vm pager sysctl stats level.
Paging-in activity is occurring correctly, using a test harness.
- The RES size for a process may appear to be greater than its SIZE.
This is believed to be due to mappings of the same shared library
page being wired twice. Further exploration is needed.
- All those diffs to syscalls.master for each architecture *are*
necessary. This needed clarification; the stub code generation for
mlockall() was disabled, which would prevent applications from
linking to this API (suggested by mux@freebsd.org)
- vm_map_*_all() may be eliminated and 0 no longer special
(reviewed by alc@freebsd.org)
- Giant has been quoshed. It is no longer held by the code, as
the required locking has been pushed down within vm_map.c.
Bruce M Simpson
<bms@spc.org>
Generated by diffcoll on Sat 19 Jul 2003 00:54:30 BST
diff -uN src/lib/libc/alpha/sys/Makefile.inc.orig src/lib/libc/alpha/sys/Makefile.inc
--- /usr/src/lib/libc/alpha/sys/Makefile.inc.orig Fri May 30 11:25:46 2003
+++ /usr/src/lib/libc/alpha/sys/Makefile.inc Sat Jul 19 00:52:04 2003
@@ -5,7 +5,7 @@
# Don't generate default code for these syscalls:
NOASM= break.o exit.o ftruncate.o getdomainname.o getlogin.o \
- lseek.o mlockall.o mmap.o munlockall.o openbsd_poll.o pread.o \
+ lseek.o mmap.o openbsd_poll.o pread.o \
pwrite.o setdomainname.o sstk.o truncate.o uname.o vfork.o yield.o
PSEUDO= _getlogin.o _exit.o
diff -uN src/lib/libc/amd64/sys/Makefile.inc.orig src/lib/libc/amd64/sys/Makefile.inc
--- /usr/src/lib/libc/amd64/sys/Makefile.inc.orig Fri May 30 11:26:03 2003
+++ /usr/src/lib/libc/amd64/sys/Makefile.inc Sat Jul 19 00:52:04 2003
@@ -6,7 +6,7 @@
# Don't generate default code for these syscalls:
NOASM= break.o exit.o ftruncate.o getdomainname.o getlogin.o \
- lseek.o mlockall.o mmap.o munlockall.o openbsd_poll.o pread.o \
+ lseek.o mmap.o openbsd_poll.o pread.o \
pwrite.o setdomainname.o sstk.o truncate.o uname.o vfork.o yield.o
PSEUDO= _getlogin.o _exit.o
diff -uN src/lib/libc/i386/sys/Makefile.inc.orig src/lib/libc/i386/sys/Makefile.inc
--- /usr/src/lib/libc/i386/sys/Makefile.inc.orig Fri May 30 04:44:28 2003
+++ /usr/src/lib/libc/i386/sys/Makefile.inc Sat Jul 19 00:52:04 2003
@@ -9,7 +9,7 @@
# Don't generate default code for these syscalls:
NOASM= break.o exit.o ftruncate.o getdomainname.o getlogin.o \
- lseek.o mlockall.o mmap.o munlockall.o openbsd_poll.o pread.o \
+ lseek.o mmap.o openbsd_poll.o pread.o \
pwrite.o setdomainname.o sstk.o truncate.o uname.o vfork.o yield.o
PSEUDO= _getlogin.o _exit.o
diff -uN src/lib/libc/ia64/sys/Makefile.inc.orig src/lib/libc/ia64/sys/Makefile.inc
--- /usr/src/lib/libc/ia64/sys/Makefile.inc.orig Fri May 30 11:26:25 2003
+++ /usr/src/lib/libc/ia64/sys/Makefile.inc Sat Jul 19 00:52:04 2003
@@ -5,7 +5,7 @@
# Don't generate default code for these syscalls:
NOASM= break.o exit.o ftruncate.o getdomainname.o getlogin.o \
- lseek.o mlockall.o mmap.o munlockall.o openbsd_poll.o pread.o \
+ lseek.o mmap.o openbsd_poll.o pread.o \
pwrite.o setdomainname.o sstk.o truncate.o uname.o vfork.o yield.o
PSEUDO= _getlogin.o _exit.o
diff -uN src/lib/libc/powerpc/sys/Makefile.inc.orig src/lib/libc/powerpc/sys/Makefile.inc
--- /usr/src/lib/libc/powerpc/sys/Makefile.inc.orig Fri May 30 11:26:40 2003
+++ /usr/src/lib/libc/powerpc/sys/Makefile.inc Sat Jul 19 00:52:04 2003
@@ -4,7 +4,7 @@
# Don't generate default code for these syscalls:
NOASM= break.o exit.o ftruncate.o getdomainname.o getlogin.o \
- lseek.o mlockall.o mmap.o munlockall.o openbsd_poll.o pread.o \
+ lseek.o mmap.o openbsd_poll.o pread.o \
pwrite.o setdomainname.o sstk.o truncate.o uname.o yield.o
PSEUDO= _getlogin.o _exit.o
diff -uN src/lib/libc/sparc64/sys/Makefile.inc.orig src/lib/libc/sparc64/sys/Makefile.inc
--- /usr/src/lib/libc/sparc64/sys/Makefile.inc.orig Fri May 30 11:27:02 2003
+++ /usr/src/lib/libc/sparc64/sys/Makefile.inc Sat Jul 19 00:52:04 2003
@@ -16,7 +16,7 @@
# Don't generate default code for these syscalls:
NOASM= break.o exit.o ftruncate.o getdomainname.o getlogin.o \
- lseek.o mlockall.o mmap.o munlockall.o openbsd_poll.o pread.o \
+ lseek.o mmap.o openbsd_poll.o pread.o \
pwrite.o setdomainname.o sstk.o truncate.o uname.o yield.o
PSEUDO= _getlogin.o _exit.o
diff -uN src/lib/libc/sys/Makefile.inc.orig src/lib/libc/sys/Makefile.inc
--- /usr/src/lib/libc/sys/Makefile.inc.orig Sat Jun 21 10:03:26 2003
+++ /usr/src/lib/libc/sys/Makefile.inc Sat Jul 19 00:52:04 2003
@@ -69,8 +69,8 @@
kldfind.2 kldfirstmod.2 kldload.2 kldnext.2 kldstat.2 kldsym.2 \
kldunload.2 kqueue.2 kse.2 ktrace.2 link.2 lio_listio.2 listen.2 \
lseek.2 \
- madvise.2 mincore.2 minherit.2 mkdir.2 mkfifo.2 mknod.2 mlock.2 mmap.2 \
- modfind.2 modnext.2 modstat.2 mount.2 \
+ madvise.2 mincore.2 minherit.2 mkdir.2 mkfifo.2 mknod.2 mlock.2 \
+ mlockall.2 mmap.2 modfind.2 modnext.2 modstat.2 mount.2 \
mprotect.2 msync.2 munmap.2 nanosleep.2 ntp_adjtime.2 ntp_gettime.2 \
nfssvc.2 open.2 pathconf.2 pipe.2 poll.2 profil.2 ptrace.2 quotactl.2 \
read.2 readlink.2 reboot.2 recv.2 rename.2 revoke.2 rfork.2 rmdir.2 \
diff -uN src/lib/libc/sys/mlockall.2.orig src/lib/libc/sys/mlockall.2
--- /usr/src/lib/libc/sys/mlockall.2.orig Fri May 30 07:01:26 2003
+++ /usr/src/lib/libc/sys/mlockall.2 Sat Jul 19 00:52:04 2003
@@ -0,0 +1,140 @@
+.\" $NetBSD: mlockall.2,v 1.11 2003/04/16 13:34:54 wiz Exp $
+.\"
+.\" Copyright (c) 1999 The NetBSD Foundation, Inc.
+.\" All rights reserved.
+.\"
+.\" This code is derived from software contributed to The NetBSD Foundation
+.\" by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
+.\" NASA Ames Research Center.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\" notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\" notice, this list of conditions and the following disclaimer in the
+.\" documentation and/or other materials provided with the distribution.
+.\" 3. All advertising materials mentioning features or use of this software
+.\" must display the following acknowledgement:
+.\" This product includes software developed by the NetBSD
+.\" Foundation, Inc. and its contributors.
+.\" 4. Neither the name of The NetBSD Foundation nor the names of its
+.\" contributors may be used to endorse or promote products derived
+.\" from this software without specific prior written permission.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+.\" ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+.\" TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+.\" BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+.\" CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+.\" SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+.\" INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+.\" CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+.\" POSSIBILITY OF SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd June 12, 1999
+.Dt MLOCKALL 2
+.Os
+.Sh NAME
+.Nm mlockall ,
+.Nm munlockall
+.Nd lock (unlock) the address space of a process
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/mman.h
+.Ft int
+.Fn mlockall "int flags"
+.Ft int
+.Fn munlockall "void"
+.Sh DESCRIPTION
+The
+.Nm mlockall
+system call locks into memory the physical pages associated with the
+address space of a process until the address space is unlocked, the
+process exits, or execs another program image.
+.Pp
+The following flags affect the behavior of
+.Nm mlockall :
+.Bl -tag -width MCL_CURRENT
+.It Dv MCL_CURRENT
+Lock all pages currently mapped into the process's address space.
+.It Dv MCL_FUTURE
+Lock all pages mapped into the process's address space in the future,
+at the time the mapping is established.
+Note that this may cause future mappings to fail if those mappings
+cause resource limits to be exceeded.
+.El
+.Pp
+Since physical memory is a potentially scarce resource, processes are
+limited in how much they can lock down.
+A single process can lock the minimum of a system-wide
+.Dq wired pages
+limit and the per-process
+.Li RLIMIT_MEMLOCK
+resource limit.
+.Pp
+The
+.Nm munlockall
+call unlocks any locked memory regions in the process address space.
+Any regions mapped after an
+.Nm munlockall
+call will not be locked.
+.Sh RETURN VALUES
+A return value of 0 indicates that the call
+succeeded and all pages in the range have either been locked or unlocked.
+A return value of -1 indicates an error occurred and the locked
+status of all pages in the range remains unchanged.
+In this case, the global location
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+.Fn mlockall
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EINVAL
+The
+.Ar flags
+argument is zero, or includes unimplemented flags.
+.It Bq Er ENOMEM
+Locking the indicated range would exceed either the system or per-process
+limit for locked memory.
+.It Bq Er EAGAIN
+Some or all of the memory mapped into the process's address space
+could not be locked when the call was made.
+.It Bq Er EPERM
+The calling process does not have the appropriate privilege to perform
+the requested operation.
+.El
+.Sh SEE ALSO
+.Xr mincore 2 ,
+.Xr mlock 2 ,
+.Xr mmap 2 ,
+.Xr munmap 2 ,
+.Xr setrlimit 2
+.Sh STANDARDS
+The
+.Fn mlockall
+and
+.Fn munlockall
+functions are believed to conform to
+.St -p1003.1-2001 .
+.Sh HISTORY
+The
+.Fn mlockall
+and
+.Fn munlockall
+functions first appeared in
+.Fx 5.1 .
+.Sh BUGS
+The per-process resource limit is a limit on the amount of virtual
+memory locked, while the system-wide limit is for the number of locked
+physical pages.
+Hence a process with two distinct locked mappings of the same physical page
+counts as 2 pages against the per-process limit and as only a single page
+in the system limit.
diff -uN src/sys/kern/link_elf.c.orig src/sys/kern/link_elf.c
--- /usr/src/sys/kern/link_elf.c.orig Fri Jun 27 07:47:39 2003
+++ /usr/src/sys/kern/link_elf.c Sat Jul 19 00:52:04 2003
@@ -744,7 +744,7 @@
vm_map_wire(kernel_map,
(vm_offset_t) segbase,
(vm_offset_t) segbase + segs[i]->p_memsz,
- FALSE);
+ VM_MAP_WIRE_SYSTEM);
#endif
}
diff -uN src/sys/sys/mman.h.orig src/sys/sys/mman.h
--- /usr/src/sys/sys/mman.h.orig Sat Jul 19 00:54:26 2003
+++ /usr/src/sys/sys/mman.h Sat Jul 19 00:53:13 2003
@@ -178,6 +178,8 @@
int munlock(const void *, size_t);
int munmap(void *, size_t);
#if __POSIX_VISIBLE >= 199309
+int mlockall(int);
+int munlockall(void);
int shm_open(const char *, int, mode_t);
int shm_unlink(const char *);
#endif
diff -uN src/sys/vm/vm_contig.c.orig src/sys/vm/vm_contig.c
--- /usr/src/sys/vm/vm_contig.c.orig Fri Jun 27 07:48:49 2003
+++ /usr/src/sys/vm/vm_contig.c Sat Jul 19 00:52:04 2003
@@ -254,7 +254,7 @@
tmp_addr += PAGE_SIZE;
}
VM_OBJECT_UNLOCK(kernel_object);
- vm_map_wire(map, addr, addr + size, FALSE);
+ vm_map_wire(map, addr, addr + size, VM_MAP_WIRE_SYSTEM);
splx(s);
return ((void *)addr);
diff -uN src/sys/vm/vm_glue.c.orig src/sys/vm/vm_glue.c
--- /usr/src/sys/vm/vm_glue.c.orig Fri Jun 27 07:49:23 2003
+++ /usr/src/sys/vm/vm_glue.c Sat Jul 19 00:52:04 2003
@@ -186,7 +186,7 @@
{
vm_map_wire(&curproc->p_vmspace->vm_map, trunc_page((vm_offset_t)addr),
- round_page((vm_offset_t)addr + len), FALSE);
+ round_page((vm_offset_t)addr + len), VM_MAP_WIRE_SYSTEM);
}
/*
@@ -200,7 +200,7 @@
vm_map_unwire(&curproc->p_vmspace->vm_map,
trunc_page((vm_offset_t)addr),
- round_page((vm_offset_t)addr + len), FALSE);
+ round_page((vm_offset_t)addr + len), VM_MAP_WIRE_SYSTEM);
}
/*
diff -uN src/sys/vm/vm_kern.c.orig src/sys/vm/vm_kern.c
--- /usr/src/sys/vm/vm_kern.c.orig Fri Jun 27 07:50:53 2003
+++ /usr/src/sys/vm/vm_kern.c Sat Jul 19 00:52:04 2003
@@ -210,7 +210,7 @@
/*
* And finally, mark the data as non-pageable.
*/
- (void) vm_map_wire(map, addr, addr + size, FALSE);
+ (void) vm_map_wire(map, addr, addr + size, VM_MAP_WIRE_SYSTEM);
return (addr);
}
diff -uN src/sys/vm/vm_map.c.orig src/sys/vm/vm_map.c
--- /usr/src/sys/vm/vm_map.c.orig Wed Jun 4 11:01:59 2003
+++ /usr/src/sys/vm/vm_map.c Sat Jul 19 00:52:04 2003
@@ -1559,19 +1559,32 @@
*/
int
vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
- boolean_t user_unwire)
+ int flags)
{
vm_map_entry_t entry, first_entry, tmp_entry;
vm_offset_t saved_start;
unsigned int last_timestamp;
int rv;
boolean_t need_wakeup, result;
+ boolean_t user_unwire;
+
+ user_unwire = (flags & VM_MAP_WIRE_USER) ? TRUE : FALSE;
vm_map_lock(map);
VM_MAP_RANGE_CHECK(map, start, end);
- if (!vm_map_lookup_entry(map, start, &first_entry)) {
- vm_map_unlock(map);
- return (KERN_INVALID_ADDRESS);
+ if (start != (vm_offset_t) 0) {
+ /* operating on arbitrary range */
+ if (!vm_map_lookup_entry(map, start, &first_entry)) {
+ vm_map_unlock(map);
+ return (KERN_INVALID_ADDRESS);
+ }
+ } else {
+ /* operating on entire process space */
+ if (map->header.next == NULL) {
+ vm_map_unlock(map);
+ return (KERN_INVALID_ADDRESS);
+ }
+ first_entry = map->header.next;
}
last_timestamp = map->timestamp;
entry = first_entry;
@@ -1627,9 +1640,11 @@
entry->eflags |= MAP_ENTRY_IN_TRANSITION;
/*
* Check the map for holes in the specified region.
+ * If VM_MAP_WIRE_NONCONTIG was specified, skip this check.
*/
- if (entry->end < end && (entry->next == &map->header ||
- entry->next->start > entry->end)) {
+ if (((flags & VM_MAP_WIRE_NONCONTIG) == 0) &&
+ (entry->end < end && (entry->next == &map->header ||
+ entry->next->start > entry->end))) {
end = entry->end;
rv = KERN_INVALID_ADDRESS;
goto done;
@@ -1688,19 +1703,25 @@
*/
int
vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end,
- boolean_t user_wire)
+ int flags)
{
vm_map_entry_t entry, first_entry, tmp_entry;
vm_offset_t saved_end, saved_start;
unsigned int last_timestamp;
int rv;
boolean_t need_wakeup, result;
+ boolean_t user_wire;
+
+ user_wire = (flags & VM_MAP_WIRE_USER) ? TRUE : FALSE;
vm_map_lock(map);
VM_MAP_RANGE_CHECK(map, start, end);
if (!vm_map_lookup_entry(map, start, &first_entry)) {
- vm_map_unlock(map);
- return (KERN_INVALID_ADDRESS);
+ if ((flags & VM_MAP_WIRE_NONCONTIG) == 0) {
+ vm_map_unlock(map);
+ return (KERN_INVALID_ADDRESS);
+ } else
+ first_entry = map->header.next;
}
last_timestamp = map->timestamp;
entry = first_entry;
@@ -1811,9 +1832,11 @@
}
/*
* Check the map for holes in the specified region.
+ * If VM_MAP_WIRE_NONCONTIG was specified, skip this check.
*/
- if (entry->end < end && (entry->next == &map->header ||
- entry->next->start > entry->end)) {
+ if (((flags & VM_MAP_WIRE_NONCONTIG) == 0) &&
+ (entry->end < end && (entry->next == &map->header ||
+ entry->next->start > entry->end))) {
end = entry->end;
rv = KERN_INVALID_ADDRESS;
goto done;
@@ -2351,6 +2374,10 @@
new_map = &vm2->vm_map; /* XXX */
new_map->timestamp = 1;
+ /* Do not inherit the MAP_WIREFUTURE property. */
+ if ((new_map->flags & MAP_WIREFUTURE) == MAP_WIREFUTURE)
+ new_map->flags &= ~MAP_WIREFUTURE;
+
old_entry = old_map->header.next;
while (old_entry != &old_map->header) {
@@ -2660,6 +2687,14 @@
}
vm_map_unlock(map);
+ /*
+ * Heed the MAP_WIREFUTURE flag if it was set for this process.
+ */
+ if (rv == KERN_SUCCESS && (map->flags & MAP_WIREFUTURE))
+ vm_map_wire(map, addr, stack_entry->start,
+ (p->p_flag & P_SYSTEM ? VM_MAP_WIRE_SYSTEM :
+ VM_MAP_WIRE_USER));
+
return (rv);
}
diff -uN src/sys/vm/vm_map.h.orig src/sys/vm/vm_map.h
--- /usr/src/sys/vm/vm_map.h.orig Wed Jun 4 13:45:35 2003
+++ /usr/src/sys/vm/vm_map.h Sat Jul 19 00:52:04 2003
@@ -81,6 +81,7 @@
* vm_map_entry_t an entry in an address map.
*/
+typedef u_int vm_flags_t;
typedef u_int vm_eflags_t;
/*
@@ -177,8 +178,11 @@
pmap_t pmap; /* (c) Physical map */
#define min_offset header.start /* (c) */
#define max_offset header.end /* (c) */
+ vm_flags_t flags; /* flags for this vm_map */
};
+#define MAP_WIREFUTURE 0x0001 /* wire all future pages */
+
#ifdef _KERNEL
static __inline vm_offset_t
vm_map_max(vm_map_t map)
@@ -197,6 +201,12 @@
{
return (map->pmap);
}
+
+static __inline void
+vm_map_modflags(vm_map_t map, vm_flags_t set, vm_flags_t clear)
+{
+ map->flags = (map->flags | set) & ~clear;
+}
#endif /* _KERNEL */
/*
@@ -296,6 +306,13 @@
#define VM_FAULT_WIRE_MASK (VM_FAULT_CHANGE_WIRING|VM_FAULT_USER_WIRE)
#define VM_FAULT_DIRTY 8 /* Dirty the page */
+/*
+ * vm_map_[un]wire option flags
+ */
+#define VM_MAP_WIRE_SYSTEM 0 /* wiring in a kernel map */
+#define VM_MAP_WIRE_USER 1 /* wiring in a user map */
+#define VM_MAP_WIRE_NONCONTIG 2 /* requested region has holes */
+
#ifdef _KERNEL
boolean_t vm_map_check_protection (vm_map_t, vm_offset_t, vm_offset_t, vm_prot_t);
struct pmap;
@@ -321,9 +338,9 @@
int vm_map_stack (vm_map_t, vm_offset_t, vm_size_t, vm_prot_t, vm_prot_t, int);
int vm_map_growstack (struct proc *p, vm_offset_t addr);
int vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
- boolean_t user_unwire);
+ int flags);
int vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end,
- boolean_t user_wire);
+ int flags);
int vmspace_swap_count (struct vmspace *vmspace);
#endif /* _KERNEL */
#endif /* _VM_MAP_ */
diff -uN src/sys/vm/vm_mmap.c.orig src/sys/vm/vm_mmap.c
--- /usr/src/sys/vm/vm_mmap.c.orig Fri Jun 27 08:32:54 2003
+++ /usr/src/sys/vm/vm_mmap.c Sat Jul 19 00:52:04 2003
@@ -1039,7 +1039,7 @@
#endif
error = vm_map_wire(&td->td_proc->p_vmspace->vm_map, addr,
- addr + size, TRUE);
+ addr + size, VM_MAP_WIRE_USER);
return (error == KERN_SUCCESS ? 0 : ENOMEM);
}
@@ -1057,14 +1057,55 @@
struct thread *td;
struct mlockall_args *uap;
{
- /* mtx_lock(&Giant); */
- /* mtx_unlock(&Giant); */
- return 0;
+ int error;
+ vm_map_t map;
+
+ error = 0;
+ map = &td->td_proc->p_vmspace->vm_map;
+
+ if ((uap->how == 0) || ((uap->how & ~(MCL_CURRENT|MCL_FUTURE)) != 0))
+ return (EINVAL);
+
+#ifdef pmap_wired_count
+ /*
+ * If wiring all pages in the process would cause it to exceed
+ * a hard resource limit, return ENOMEM.
+ */
+ if (map->size - ptoa(pmap_wired_count(vm_map_pmap(map)) >
+ td->td_proc->p_rlimit[RLIMIT_MEMLOCK].rlim_cur))
+ return (ENOMEM);
+#else
+ error = suser(td);
+ if (error)
+ return (error);
+#endif
+
+ if (uap->how & MCL_FUTURE) {
+ vm_map_lock(map);
+ vm_map_modflags(map, MAP_WIREFUTURE, 0);
+ vm_map_unlock(map);
+ error = 0;
+ }
+
+ if (uap->how & MCL_CURRENT) {
+ /*
+ * P1003.1-2001 actually mandates that all currently
+ * mapped pages will be memory resident and locked (wired).
+ * This implies that we need to prefault. However, the act
+ * of wiring the page will incur a call to vm_fault_wire(),
+ * which will fault in the newly wired page.
+ */
+ error = vm_map_wire(map, vm_map_min(map), vm_map_max(map),
+ VM_MAP_WIRE_USER|VM_MAP_WIRE_NONCONTIG);
+ error = (error == KERN_SUCCESS ? 0 : EAGAIN);
+ }
+
+ return (error);
}
#ifndef _SYS_SYSPROTO_H_
struct munlockall_args {
- int how;
+ register_t dummy;
};
#endif
@@ -1076,9 +1117,27 @@
struct thread *td;
struct munlockall_args *uap;
{
- /* mtx_lock(&Giant); */
- /* mtx_unlock(&Giant); */
- return 0;
+ int error;
+ vm_map_t map;
+
+#ifndef pmap_wired_count
+ error = suser(td);
+ if (error)
+ return (error);
+#endif
+ error = 0;
+ map = &td->td_proc->p_vmspace->vm_map;
+
+ /* Clear the MAP_WIREFUTURE flag from this vm_map. */
+ vm_map_lock(map);
+ vm_map_modflags(map, 0, MAP_WIREFUTURE);
+ vm_map_unlock(map);
+
+ /* Forcibly unwire all pages. */
+ error = vm_map_unwire(map, vm_map_min(map), vm_map_max(map),
+ VM_MAP_WIRE_USER|VM_MAP_WIRE_NONCONTIG);
+
+ return (error);
}
#ifndef _SYS_SYSPROTO_H_
@@ -1118,7 +1177,7 @@
#endif
error = vm_map_unwire(&td->td_proc->p_vmspace->vm_map, addr,
- addr + size, TRUE);
+ addr + size, VM_MAP_WIRE_USER);
return (error == KERN_SUCCESS ? 0 : ENOMEM);
}
@@ -1275,6 +1334,14 @@
if (rv != KERN_SUCCESS)
(void) vm_map_remove(map, *addr, *addr + size);
}
+
+ /*
+ * If the process has requested that all future mappings
+ * be wired, then heed this.
+ */
+ if ((rv == KERN_SUCCESS) && (map->flags & MAP_WIREFUTURE))
+ vm_map_wire(map, *addr, *addr + size, VM_MAP_WIRE_USER);
+
switch (rv) {
case KERN_SUCCESS:
return (0);
diff -uN src/sys/vm/vm_unix.c.orig src/sys/vm/vm_unix.c
--- /usr/src/sys/vm/vm_unix.c.orig Wed Jun 4 22:40:38 2003
+++ /usr/src/sys/vm/vm_unix.c Sat Jul 19 00:52:04 2003
@@ -77,6 +77,9 @@
vm_offset_t new, old, base;
int rv;
int error = 0;
+ boolean_t do_map_wirefuture;
+
+ do_map_wirefuture = FALSE;
new = round_page((vm_offset_t)uap->nsize);
vm_map_lock(&vm->vm_map);
@@ -119,6 +122,21 @@
goto done;
}
vm->vm_dsize += btoc(new - old);
+ /*
+ * Handle the MAP_WIREFUTURE case for legacy applications,
+ * by marking the newly mapped range of pages as wired.
+ *
+ * We are not required to perform a corresponding
+ * vm_map_unwire() before vm_map_delete() below, as
+ * it will forcibly unwire the pages in the range.
+ *
+ * XXX If the pages cannot be wired, no error is returned.
+ */
+ if ((vm->vm_map.flags & MAP_WIREFUTURE) == MAP_WIREFUTURE) {
+ if (bootverbose)
+ printf("obreak: MAP_WIREFUTURE set\n");
+ do_map_wirefuture = TRUE;
+ }
} else if (new < old) {
rv = vm_map_delete(&vm->vm_map, new, old);
if (rv != KERN_SUCCESS) {
@@ -129,6 +147,10 @@
}
done:
vm_map_unlock(&vm->vm_map);
+
+ if (do_map_wirefuture)
+ (void) vm_map_wire(&vm->vm_map, old, new, VM_MAP_WIRE_USER);
+
return (error);
}
--OgqxwSJOaUobr8KG--
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