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Provide separate accounting for user-wired pages.

Browse Source 
Historically we have not distinguished between kernel wirings and user
wirings for accounting purposes.  User wirings (via mlock(2)) were
subject to a global limit on the number of wired pages, so if large
swaths of physical memory were wired by the kernel, as happens with
the ZFS ARC among other things, the limit could be exceeded, causing
user wirings to fail.

The change adds a new counter, v_user_wire_count, which counts the
number of virtual pages wired by user processes via mlock(2) and
mlockall(2).  Only user-wired pages are subject to the system-wide
limit which helps provide some safety against deadlocks.  In
particular, while sources of kernel wirings typically support some
backpressure mechanism, there is no way to reclaim user-wired pages
shorting of killing the wiring process.  The limit is exported as
vm.max_user_wired, renamed from vm.max_wired, and changed from u_int
to u_long.

The choice to count virtual user-wired pages rather than physical
pages was done for simplicity.  There are mechanisms that can cause
user-wired mappings to be destroyed while maintaining a wiring of
the backing physical page; these make it difficult to accurately
track user wirings at the physical page layer.

The change also closes some holes which allowed user wirings to succeed
even when they would cause the system limit to be exceeded.  For
instance, mmap() may now fail with ENOMEM in a process that has called
mlockall(MCL_FUTURE) if the new mapping would cause the user wiring
limit to be exceeded.

Note that bhyve -S is subject to the user wiring limit, which defaults
to 1/3 of physical RAM.  Users that wish to exceed the limit must tune
vm.max_user_wired.

Reviewed by:	kib, ngie (mlock() test changes)
Tested by:	pho (earlier version)
MFC after:	45 days
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D19908
This commit is contained in:
Mark Johnston 2019-05-13 16:38:48 +00:00
parent af1f58df99
commit 54a3a11421
15 changed files with 158 additions and 107 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
contrib/netbsd-tests/lib/libc/sys/t_mlock.c
View File

@ -51,7 +51,7 @@ __RCSID("$NetBSD: t_mlock.c,v 1.6 2016/08/09 12:02:44 kre Exp $");
#define _KMEMUSER
#include <machine/vmparam.h>
void set_vm_max_wired(int);
void set_vm_max_wired(u_long);
void restore_vm_max_wired(void);
#endif

28
lib/libc/sys/mlock.2
View File

@ -28,7 +28,7 @@
.\" @(#)mlock.2 8.2 (Berkeley) 12/11/93
.\" $FreeBSD$
.\"
.Dd March 20, 2018
.Dd May 13, 2019
.Dt MLOCK 2
.Os
.Sh NAME
@ -97,13 +97,13 @@ resource limit and the
system-wide
.Dq wired pages
limit
.Va vm.max_wired .
.Va vm.max_wired
.Va vm.max_user_wired .
.Va vm.max_user_wired
applies to the system as a whole, so the amount available to a single
process at any given time is the difference between
.Va vm.max_wired
.Va vm.max_user_wired
and
.Va vm.stats.vm.v_wire_count .
.Va vm.stats.vm.v_user_wire_count .
.Pp
If
.Va security.bsd.unprivileged_mlock
@ -124,13 +124,11 @@ will fail if:
is set to 0 and the caller is not the super-user.
.It Bq Er EINVAL
The address range given wraps around zero.
.It Bq Er EAGAIN
Locking the indicated range would exceed the system limit for locked memory.
.It Bq Er ENOMEM
Some portion of the indicated address range is not allocated.
There was an error faulting/mapping a page.
Locking the indicated range would exceed the per-process limit for locked
memory.
Locking the indicated range would exceed the per-process or system-wide limits
for locked memory.
.El
The
.Fn munlock
@ -171,11 +169,11 @@ system calls first appeared in
Allocating too much wired memory can lead to a memory-allocation deadlock
which requires a reboot to recover from.
.Pp
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.
The per-process and system-wide resource limits of locked memory apply
to the amount of virtual memory locked, not the amount of locked physical
pages.
Hence two distinct locked mappings of the same physical page counts as
2 pages aginst the system limit, and also against the per-process limit
if both mappings belong to the same physical map.
.Pp
The per-process resource limit is not currently supported.

16
lib/libc/sys/mlockall.2
View File

@ -30,7 +30,7 @@
.\"
.\" $FreeBSD$
.\"
.Dd December 25, 2012
.Dd May 13, 2019
.Dt MLOCKALL 2
.Os
.Sh NAME
@ -69,7 +69,7 @@ limited in how much they can lock down.
A single process can lock the minimum of a system-wide
.Dq wired pages
limit
.Va vm.max_wired
.Va vm.max_user_wired
and the per-process
.Dv RLIMIT_MEMLOCK
resource limit.
@ -138,9 +138,9 @@ and
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.
The per-process and system-wide resource limits of locked memory apply
to the amount of virtual memory locked, not the amount of locked physical
pages.
Hence two distinct locked mappings of the same physical page counts as
2 pages aginst the system limit, and also against the per-process limit
if both mappings belong to the same physical map.

22
lib/libc/tests/sys/mlock_helper.c
View File

@ -39,16 +39,16 @@ __FBSDID("$FreeBSD$");
#include <limits.h>
#include <stdio.h>
#define VM_MAX_WIRED "vm.max_wired"
#define VM_MAX_WIRED "vm.max_user_wired"
static void
vm_max_wired_sysctl(int *old_value, int *new_value)
vm_max_wired_sysctl(u_long *old_value, u_long *new_value)
{
size_t old_len;
size_t new_len = (new_value == NULL ? 0 : sizeof(int));
size_t new_len = (new_value == NULL ? 0 : sizeof(*new_value));
if (old_value == NULL)
printf("Setting the new value to %d\n", *new_value);
printf("Setting the new value to %lu\n", *new_value);
else {
ATF_REQUIRE_MSG(sysctlbyname(VM_MAX_WIRED, NULL, &old_len,
new_value, new_len) == 0,
@ -60,14 +60,14 @@ vm_max_wired_sysctl(int *old_value, int *new_value)
"sysctlbyname(%s) failed: %s", VM_MAX_WIRED, strerror(errno));
if (old_value != NULL)
printf("Saved the old value (%d)\n", *old_value);
printf("Saved the old value (%lu)\n", *old_value);
}
void
set_vm_max_wired(int new_value)
set_vm_max_wired(u_long new_value)
{
FILE *fp;
int old_value;
u_long old_value;
fp = fopen(VM_MAX_WIRED, "w");
if (fp == NULL) {
@ -78,7 +78,7 @@ set_vm_max_wired(int new_value)
vm_max_wired_sysctl(&old_value, NULL);
ATF_REQUIRE_MSG(fprintf(fp, "%d", old_value) > 0,
ATF_REQUIRE_MSG(fprintf(fp, "%lu", old_value) > 0,
"saving %s failed", VM_MAX_WIRED);
fclose(fp);
@ -90,7 +90,7 @@ void
restore_vm_max_wired(void)
{
FILE *fp;
int saved_max_wired;
u_long saved_max_wired;
fp = fopen(VM_MAX_WIRED, "r");
if (fp == NULL) {
@ -98,14 +98,14 @@ restore_vm_max_wired(void)
return;
}
if (fscanf(fp, "%d", &saved_max_wired) != 1) {
if (fscanf(fp, "%lu", &saved_max_wired) != 1) {
perror("fscanf failed\n");
fclose(fp);
return;
}
fclose(fp);
printf("old value in %s: %d\n", VM_MAX_WIRED, saved_max_wired);
printf("old value in %s: %lu\n", VM_MAX_WIRED, saved_max_wired);
if (saved_max_wired == 0) /* This will cripple the test host */
return;

3
sys/amd64/vmm/vmm.c
View File

@ -754,7 +754,8 @@ vm_mmap_memseg(struct vm *vm, vm_paddr_t gpa, int segid, vm_ooffset_t first,
VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
if (error != KERN_SUCCESS) {
vm_map_remove(&vm->vmspace->vm_map, gpa, gpa + len);
return (EFAULT);
return (error == KERN_RESOURCE_SHORTAGE ? ENOMEM :
EFAULT);
}
}

2
sys/sys/vmmeter.h
View File

@ -153,6 +153,8 @@ extern domainset_t vm_severe_domains;
#define VM_CNT_INC(var) VM_CNT_ADD(var, 1)
#define VM_CNT_FETCH(var) counter_u64_fetch(vm_cnt.var)
extern u_long vm_user_wire_count;
static inline void
vm_wire_add(int cnt)
{

15
sys/vm/vm_glue.c
View File

@ -181,21 +181,8 @@ vslock(void *addr, size_t len)
if (last < (vm_offset_t)addr || end < (vm_offset_t)addr)
return (EINVAL);
npages = atop(end - start);
if (npages > vm_page_max_wired)
if (npages > vm_page_max_user_wired)
return (ENOMEM);
#if 0
/*
* XXX - not yet
*
* The limit for transient usage of wired pages should be
* larger than for "permanent" wired pages (mlock()).
*
* Also, the sysctl code, which is the only present user
* of vslock(), does a hard loop on EAGAIN.
*/
if (npages + vm_wire_count() > vm_page_max_wired)
return (EAGAIN);
#endif
error = vm_map_wire(&curproc->p_vmspace->vm_map, start, end,
VM_MAP_WIRE_SYSTEM | VM_MAP_WIRE_NOHOLES);
if (error == KERN_SUCCESS) {

99
sys/vm/vm_map.c
View File

@ -90,6 +90,7 @@ __FBSDID("$FreeBSD$");
#include <vm/pmap.h>
#include <vm/vm_map.h>
#include <vm/vm_page.h>
#include <vm/vm_pageout.h>
#include <vm/vm_object.h>
#include <vm/vm_pager.h>
#include <vm/vm_kern.h>
@ -2917,12 +2918,12 @@ vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
if (rv == KERN_SUCCESS && (!user_unwire ||
(entry->eflags & MAP_ENTRY_USER_WIRED))) {
if (user_unwire)
entry->eflags &= ~MAP_ENTRY_USER_WIRED;
if (entry->wired_count == 1)
vm_map_entry_unwire(map, entry);
else
entry->wired_count--;
if (user_unwire)
entry->eflags &= ~MAP_ENTRY_USER_WIRED;
}
KASSERT((entry->eflags & MAP_ENTRY_IN_TRANSITION) != 0,
("vm_map_unwire: in-transition flag missing %p", entry));
@ -2942,6 +2943,28 @@ vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
return (rv);
}
static void
vm_map_wire_user_count_sub(u_long npages)
{
atomic_subtract_long(&vm_user_wire_count, npages);
}
static bool
vm_map_wire_user_count_add(u_long npages)
{
u_long wired;
wired = vm_user_wire_count;
do {
if (npages + wired > vm_page_max_user_wired)
return (false);
} while (!atomic_fcmpset_long(&vm_user_wire_count, &wired,
npages + wired));
return (true);
}
/*
* vm_map_wire_entry_failure:
*
@ -2978,37 +3001,49 @@ vm_map_wire_entry_failure(vm_map_t map, vm_map_entry_t entry,
entry->wired_count = -1;
}
int
vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags)
{
int rv;
vm_map_lock(map);
rv = vm_map_wire_locked(map, start, end, flags);
vm_map_unlock(map);
return (rv);
}
/*
* vm_map_wire:
* vm_map_wire_locked:
*
* Implements both kernel and user wiring.
* Implements both kernel and user wiring. Returns with the map locked,
* the map lock may be dropped.
*/
int
vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end,
int flags)
vm_map_wire_locked(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags)
{
vm_map_entry_t entry, first_entry, tmp_entry;
vm_offset_t faddr, saved_end, saved_start;
unsigned int last_timestamp;
u_long npages;
u_int last_timestamp;
int rv;
boolean_t need_wakeup, result, user_wire;
vm_prot_t prot;
VM_MAP_ASSERT_LOCKED(map);
if (start == end)
return (KERN_SUCCESS);
prot = 0;
if (flags & VM_MAP_WIRE_WRITE)
prot |= VM_PROT_WRITE;
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)) {
if (flags & VM_MAP_WIRE_HOLESOK)
first_entry = first_entry->next;
else {
vm_map_unlock(map);
else
return (KERN_INVALID_ADDRESS);
}
}
last_timestamp = map->timestamp;
entry = first_entry;
@ -3042,7 +3077,6 @@ vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end,
/*
* first_entry has been deleted.
*/
vm_map_unlock(map);
return (KERN_INVALID_ADDRESS);
}
end = saved_start;
@ -3082,13 +3116,22 @@ vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end,
}
if (entry->wired_count == 0) {
entry->wired_count++;
saved_start = entry->start;
saved_end = entry->end;
npages = atop(entry->end - entry->start);
if (user_wire && !vm_map_wire_user_count_add(npages)) {
vm_map_wire_entry_failure(map, entry,
entry->start);
end = entry->end;
rv = KERN_RESOURCE_SHORTAGE;
goto done;
}
/*
* Release the map lock, relying on the in-transition
* mark. Mark the map busy for fork.
*/
saved_start = entry->start;
saved_end = entry->end;
vm_map_busy(map);
vm_map_unlock(map);
@ -3136,6 +3179,8 @@ vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end,
last_timestamp = map->timestamp;
if (rv != KERN_SUCCESS) {
vm_map_wire_entry_failure(map, entry, faddr);
if (user_wire)
vm_map_wire_user_count_sub(npages);
end = entry->end;
goto done;
}
@ -3201,9 +3246,12 @@ vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end,
* Undo the wiring. Wiring succeeded on this entry
* but failed on a later entry.
*/
if (entry->wired_count == 1)
if (entry->wired_count == 1) {
vm_map_entry_unwire(map, entry);
else
if (user_wire)
vm_map_wire_user_count_sub(
atop(entry->end - entry->start));
} else
entry->wired_count--;
}
next_entry_done:
@ -3220,7 +3268,6 @@ vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end,
}
vm_map_simplify_entry(map, entry);
}
vm_map_unlock(map);
if (need_wakeup)
vm_map_wakeup(map);
return (rv);
@ -3338,13 +3385,18 @@ vm_map_sync(
static void
vm_map_entry_unwire(vm_map_t map, vm_map_entry_t entry)
{
vm_size_t size;
VM_MAP_ASSERT_LOCKED(map);
KASSERT(entry->wired_count > 0,
("vm_map_entry_unwire: entry %p isn't wired", entry));
size = entry->end - entry->start;
if ((entry->eflags & MAP_ENTRY_USER_WIRED) != 0)
vm_map_wire_user_count_sub(atop(size));
pmap_unwire(map->pmap, entry->start, entry->end);
vm_object_unwire(entry->object.vm_object, entry->offset, entry->end -
entry->start, PQ_ACTIVE);
vm_object_unwire(entry->object.vm_object, entry->offset, size,
PQ_ACTIVE);
entry->wired_count = 0;
}
@ -4311,12 +4363,11 @@ vm_map_growstack(vm_map_t map, vm_offset_t addr, vm_map_entry_t gap_entry)
* Heed the MAP_WIREFUTURE flag if it was set for this process.
*/
if (rv == KERN_SUCCESS && (map->flags & MAP_WIREFUTURE) != 0) {
vm_map_unlock(map);
vm_map_wire(map, grow_start, grow_start + grow_amount,
rv = vm_map_wire_locked(map, grow_start,
grow_start + grow_amount,
VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
vm_map_lock_read(map);
} else
vm_map_lock_downgrade(map);
}
vm_map_lock_downgrade(map);
out:
#ifdef RACCT

3
sys/vm/vm_map.h
View File

@ -422,7 +422,8 @@ int vm_map_madvise (vm_map_t, vm_offset_t, vm_offset_t, int);
int vm_map_stack (vm_map_t, vm_offset_t, vm_size_t, vm_prot_t, vm_prot_t, int);
int vm_map_unwire(vm_map_t map, vm_offset_t start, vm_offset_t end,
int flags);
int vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end,
int vm_map_wire(vm_map_t map, vm_offset_t start, vm_offset_t end, int flags);
int vm_map_wire_locked(vm_map_t map, vm_offset_t start, vm_offset_t end,
int flags);
long vmspace_swap_count(struct vmspace *vmspace);
void vm_map_entry_set_vnode_text(vm_map_entry_t entry, bool add);

7
sys/vm/vm_meter.c
View File

@ -97,6 +97,8 @@ struct vmmeter __read_mostly vm_cnt = {
.v_wire_count = EARLY_COUNTER,
};
u_long __exclusive_cache_line vm_user_wire_count;
static void
vmcounter_startup(void)
{
@ -394,6 +396,8 @@ sysctl_handle_vmstat_proc(SYSCTL_HANDLER_ARGS)
#define VM_STATS_UINT(var, descr) \
SYSCTL_UINT(_vm_stats_vm, OID_AUTO, var, CTLFLAG_RD, &vm_cnt.var, 0, descr)
#define VM_STATS_ULONG(var, descr) \
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO, var, CTLFLAG_RD, &vm_cnt.var, 0, descr)
VM_STATS_UINT(v_page_size, "Page size in bytes");
VM_STATS_UINT(v_page_count, "Total number of pages in system");
@ -411,6 +415,9 @@ VM_STATS_UINT(v_pageout_free_min, "Min pages reserved for kernel");
VM_STATS_UINT(v_interrupt_free_min, "Reserved pages for interrupt code");
VM_STATS_UINT(v_free_severe, "Severe page depletion point");
SYSCTL_ULONG(_vm_stats_vm, OID_AUTO, v_user_wire_count, CTLFLAG_RD,
&vm_user_wire_count, 0, "User-wired virtual memory");
#ifdef COMPAT_FREEBSD11
/*
* Provide compatibility sysctls for the benefit of old utilities which exit

25
sys/vm/vm_mmap.c
View File

@ -1003,7 +1003,7 @@ kern_mlock(struct proc *proc, struct ucred *cred, uintptr_t addr0, size_t len)
if (last < addr || end < addr)
return (EINVAL);
npages = atop(end - start);
if (npages > vm_page_max_wired)
if (npages > vm_page_max_user_wired)
return (ENOMEM);
map = &proc->p_vmspace->vm_map;
PROC_LOCK(proc);
@ -1013,8 +1013,6 @@ kern_mlock(struct proc *proc, struct ucred *cred, uintptr_t addr0, size_t len)
return (ENOMEM);
}
PROC_UNLOCK(proc);
if (npages + vm_wire_count() > vm_page_max_wired)
return (EAGAIN);
#ifdef RACCT
if (racct_enable) {
PROC_LOCK(proc);
@ -1091,7 +1089,12 @@ sys_mlockall(struct thread *td, struct mlockall_args *uap)
*/
error = vm_map_wire(map, vm_map_min(map), vm_map_max(map),
VM_MAP_WIRE_USER|VM_MAP_WIRE_HOLESOK);
error = (error == KERN_SUCCESS ? 0 : EAGAIN);
if (error == KERN_SUCCESS)
error = 0;
else if (error == KERN_RESOURCE_SHORTAGE)
error = ENOMEM;
else
error = EAGAIN;
}
#ifdef RACCT
if (racct_enable && error != KERN_SUCCESS) {
@ -1558,10 +1561,16 @@ vm_mmap_object(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
* If the process has requested that all future mappings
* be wired, then heed this.
*/
if (map->flags & MAP_WIREFUTURE) {
vm_map_wire(map, *addr, *addr + size,
VM_MAP_WIRE_USER | ((flags & MAP_STACK) ?
VM_MAP_WIRE_HOLESOK : VM_MAP_WIRE_NOHOLES));
if ((map->flags & MAP_WIREFUTURE) != 0) {
vm_map_lock(map);
if ((map->flags & MAP_WIREFUTURE) != 0)
rv = vm_map_wire_locked(map, *addr,
*addr + size, VM_MAP_WIRE_USER |
((flags & MAP_STACK) ? VM_MAP_WIRE_HOLESOK :
VM_MAP_WIRE_NOHOLES));
if (rv != KERN_SUCCESS)
(void)vm_map_delete(map, *addr, *addr + size);
vm_map_unlock(map);
}
}
return (vm_mmap_to_errno(rv));

11
sys/vm/vm_pageout.c
View File

@ -194,9 +194,10 @@ SYSCTL_UINT(_vm, OID_AUTO, background_launder_max, CTLFLAG_RWTUN,
int vm_pageout_page_count = 32;
int vm_page_max_wired; /* XXX max # of wired pages system-wide */
SYSCTL_INT(_vm, OID_AUTO, max_wired,
CTLFLAG_RW, &vm_page_max_wired, 0, "System-wide limit to wired page count");
u_long vm_page_max_user_wired;
SYSCTL_ULONG(_vm, OID_AUTO, max_user_wired, CTLFLAG_RW,
&vm_page_max_user_wired, 0,
"system-wide limit to user-wired page count");
static u_int isqrt(u_int num);
static int vm_pageout_launder(struct vm_domain *vmd, int launder,
@ -2041,8 +2042,8 @@ vm_pageout_init(void)
if (vm_pageout_update_period == 0)
vm_pageout_update_period = 600;
if (vm_page_max_wired == 0)
vm_page_max_wired = freecount / 3;
if (vm_page_max_user_wired == 0)
vm_page_max_user_wired = freecount / 3;
}
/*

2
sys/vm/vm_pageout.h
View File

@ -75,7 +75,7 @@
* Exported data structures.
*/
extern int vm_page_max_wired;
extern u_long vm_page_max_user_wired;
extern int vm_pageout_page_count;
#define VM_OOM_MEM 1

26
sys/vm/vm_unix.c
View File

@ -95,13 +95,11 @@ kern_break(struct thread *td, uintptr_t *addr)
rlim_t datalim, lmemlim, vmemlim;
int prot, rv;
int error = 0;
boolean_t do_map_wirefuture;
datalim = lim_cur(td, RLIMIT_DATA);
lmemlim = lim_cur(td, RLIMIT_MEMLOCK);
vmemlim = lim_cur(td, RLIMIT_VMEM);
do_map_wirefuture = FALSE;
new = round_page(*addr);
vm_map_lock(map);
@ -184,7 +182,14 @@ kern_break(struct thread *td, uintptr_t *addr)
if (i386_read_exec && SV_PROC_FLAG(td->td_proc, SV_ILP32))
prot |= VM_PROT_EXECUTE;
#endif
rv = vm_map_insert(map, NULL, 0, old, new, prot, VM_PROT_ALL, 0);
rv = vm_map_insert(map, NULL, 0, old, new, prot, VM_PROT_ALL,
0);
if (rv == KERN_SUCCESS && (map->flags & MAP_WIREFUTURE) != 0) {
rv = vm_map_wire_locked(map, old, new,
VM_MAP_WIRE_USER | VM_MAP_WIRE_NOHOLES);
if (rv != KERN_SUCCESS)
vm_map_delete(map, old, new);
}
if (rv != KERN_SUCCESS) {
#ifdef RACCT
if (racct_enable) {
@ -205,17 +210,6 @@ kern_break(struct thread *td, uintptr_t *addr)
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 ((map->flags & MAP_WIREFUTURE) == MAP_WIREFUTURE)
do_map_wirefuture = TRUE;
} else if (new < old) {
rv = vm_map_delete(map, new, old);
if (rv != KERN_SUCCESS) {
@ -239,10 +233,6 @@ kern_break(struct thread *td, uintptr_t *addr)
done:
vm_map_unlock(map);
if (do_map_wirefuture)
(void) vm_map_wire(map, old, new,
VM_MAP_WIRE_USER|VM_MAP_WIRE_NOHOLES);
if (error == 0)
*addr = new;

4
usr.bin/vmstat/vmstat.c
View File

@ -156,6 +156,7 @@ static struct __vmmeter {
u_int v_free_min;
u_int v_free_count;
u_int v_wire_count;
u_long v_user_wire_count;
u_int v_active_count;
u_int v_inactive_target;
u_int v_inactive_count;
@ -566,6 +567,7 @@ fill_vmmeter(struct __vmmeter *vmmp)
GET_VM_STATS(vm, v_free_min);
GET_VM_STATS(vm, v_free_count);
GET_VM_STATS(vm, v_wire_count);
GET_VM_STATS(vm, v_user_wire_count);
GET_VM_STATS(vm, v_active_count);
GET_VM_STATS(vm, v_inactive_target);
GET_VM_STATS(vm, v_inactive_count);
@ -1057,6 +1059,8 @@ dosum(void)
sum.v_laundry_count);
xo_emit("{:wired-pages/%9u} {N:pages wired down}\n",
sum.v_wire_count);
xo_emit("{:virtual-user-wired-pages/%9lu} {N:virtual user pages wired "
"down}\n", sum.v_user_wire_count);
xo_emit("{:free-pages/%9u} {N:pages free}\n",
sum.v_free_count);
xo_emit("{:bytes-per-page/%9u} {N:bytes per page}\n", sum.v_page_size);