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- Fix locked memory accounting for maps with MAP_WIREFUTURE flag.

Browse Source 
- Add sysctl vm.old_mlock which may turn such accounting off.

Reviewed by:	avg, trasz
Approved by:	kib (mentor)
MFC after:	1 week
This commit is contained in:
Andrey Zonov 2012-12-18 07:35:01 +00:00
parent b944c830ba
commit 7e19eda4aa
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=244384
4 changed files with 106 additions and 18 deletions
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2
sys/vm/vm.h
View File

@ -141,6 +141,8 @@ struct kva_md_info {
extern struct kva_md_info kmi;
extern void vm_ksubmap_init(struct kva_md_info *);
extern int old_mlock;
struct ucred;
int swap_reserve(vm_ooffset_t incr);
int swap_reserve_by_cred(vm_ooffset_t incr, struct ucred *cred);

45
sys/vm/vm_map.c
View File

@ -3247,7 +3247,7 @@ vm_map_stack(vm_map_t map, vm_offset_t addrbos, vm_size_t max_ssize,
vm_offset_t bot, top;
vm_size_t growsize, init_ssize;
int orient, rv;
rlim_t vmemlim;
rlim_t lmemlim, vmemlim;
/*
* The stack orientation is piggybacked with the cow argument.
@ -3267,9 +3267,10 @@ vm_map_stack(vm_map_t map, vm_offset_t addrbos, vm_size_t max_ssize,
growsize = sgrowsiz;
init_ssize = (max_ssize < growsize) ? max_ssize : growsize;
PROC_LOCK(curthread->td_proc);
vmemlim = lim_cur(curthread->td_proc, RLIMIT_VMEM);
PROC_UNLOCK(curthread->td_proc);
PROC_LOCK(curproc);
lmemlim = lim_cur(curproc, RLIMIT_MEMLOCK);
vmemlim = lim_cur(curproc, RLIMIT_VMEM);
PROC_UNLOCK(curproc);
vm_map_lock(map);
@ -3279,6 +3280,14 @@ vm_map_stack(vm_map_t map, vm_offset_t addrbos, vm_size_t max_ssize,
return (KERN_NO_SPACE);
}
if (!old_mlock && map->flags & MAP_WIREFUTURE) {
if (ptoa(vmspace_wired_count(curproc->p_vmspace)) +
init_ssize > lmemlim) {
vm_map_unlock(map);
return (KERN_NO_SPACE);
}
}
/* If we would blow our VMEM resource limit, no go */
if (map->size + init_ssize > vmemlim) {
vm_map_unlock(map);
@ -3360,7 +3369,7 @@ vm_map_growstack(struct proc *p, vm_offset_t addr)
vm_offset_t end;
vm_size_t growsize;
size_t grow_amount, max_grow;
rlim_t stacklim, vmemlim;
rlim_t lmemlim, stacklim, vmemlim;
int is_procstack, rv;
struct ucred *cred;
#ifdef notyet
@ -3372,6 +3381,7 @@ vm_map_growstack(struct proc *p, vm_offset_t addr)
Retry:
PROC_LOCK(p);
lmemlim = lim_cur(p, RLIMIT_MEMLOCK);
stacklim = lim_cur(p, RLIMIT_STACK);
vmemlim = lim_cur(p, RLIMIT_VMEM);
PROC_UNLOCK(p);
@ -3494,7 +3504,25 @@ vm_map_growstack(struct proc *p, vm_offset_t addr)
if (is_procstack && (ctob(vm->vm_ssize) + grow_amount > limit))
grow_amount = limit - ctob(vm->vm_ssize);
#endif
if (!old_mlock && map->flags & MAP_WIREFUTURE) {
if (ptoa(vmspace_wired_count(p->p_vmspace)) + grow_amount >
lmemlim) {
vm_map_unlock_read(map);
rv = KERN_NO_SPACE;
goto out;
}
#ifdef RACCT
PROC_LOCK(p);
if (racct_set(p, RACCT_MEMLOCK,
ptoa(vmspace_wired_count(p->p_vmspace)) + grow_amount)) {
PROC_UNLOCK(p);
vm_map_unlock_read(map);
rv = KERN_NO_SPACE;
goto out;
}
PROC_UNLOCK(p);
#endif
}
/* If we would blow our VMEM resource limit, no go */
if (map->size + grow_amount > vmemlim) {
vm_map_unlock_read(map);
@ -3615,6 +3643,11 @@ vm_map_growstack(struct proc *p, vm_offset_t addr)
PROC_LOCK(p);
error = racct_set(p, RACCT_VMEM, map->size);
KASSERT(error == 0, ("decreasing RACCT_VMEM failed"));
if (!old_mlock) {
error = racct_set(p, RACCT_MEMLOCK,
ptoa(vmspace_wired_count(p->p_vmspace)));
KASSERT(error == 0, ("decreasing RACCT_MEMLOCK failed"));
}
error = racct_set(p, RACCT_STACK, ctob(vm->vm_ssize));
KASSERT(error == 0, ("decreasing RACCT_STACK failed"));
PROC_UNLOCK(p);

44
sys/vm/vm_mmap.c
View File

@ -59,6 +59,7 @@ __FBSDID("$FreeBSD$");
#include <sys/racct.h>
#include <sys/resource.h>
#include <sys/resourcevar.h>
#include <sys/sysctl.h>
#include <sys/vnode.h>
#include <sys/fcntl.h>
#include <sys/file.h>
@ -87,6 +88,11 @@ __FBSDID("$FreeBSD$");
#include <sys/pmckern.h>
#endif
int old_mlock = 0;
SYSCTL_INT(_vm, OID_AUTO, old_mlock, CTLFLAG_RW | CTLFLAG_TUN, &old_mlock, 0,
"Do not apply RLIMIT_MEMLOCK on mlockall");
TUNABLE_INT("vm.old_mlock", &old_mlock);
#ifndef _SYS_SYSPROTO_H_
struct sbrk_args {
int incr;
@ -1096,27 +1102,25 @@ sys_mlockall(td, uap)
int error;
map = &td->td_proc->p_vmspace->vm_map;
error = 0;
error = priv_check(td, PRIV_VM_MLOCK);
if (error)
return (error);
if ((uap->how == 0) || ((uap->how & ~(MCL_CURRENT|MCL_FUTURE)) != 0))
return (EINVAL);
#if 0
/*
* If wiring all pages in the process would cause it to exceed
* a hard resource limit, return ENOMEM.
*/
PROC_LOCK(td->td_proc);
if (map->size > lim_cur(td->td_proc, RLIMIT_MEMLOCK)) {
if (!old_mlock && uap->how & MCL_CURRENT) {
PROC_LOCK(td->td_proc);
if (map->size > lim_cur(td->td_proc, RLIMIT_MEMLOCK)) {
PROC_UNLOCK(td->td_proc);
return (ENOMEM);
}
PROC_UNLOCK(td->td_proc);
return (ENOMEM);
}
PROC_UNLOCK(td->td_proc);
#else
error = priv_check(td, PRIV_VM_MLOCK);
if (error)
return (error);
#endif
#ifdef RACCT
PROC_LOCK(td->td_proc);
error = racct_set(td->td_proc, RACCT_MEMLOCK, map->size);
@ -1480,6 +1484,24 @@ vm_mmap(vm_map_t map, vm_offset_t *addr, vm_size_t size, vm_prot_t prot,
PROC_UNLOCK(td->td_proc);
return (ENOMEM);
}
if (!old_mlock && map->flags & MAP_WIREFUTURE) {
if (ptoa(vmspace_wired_count(td->td_proc->p_vmspace)) +
size > lim_cur(td->td_proc, RLIMIT_MEMLOCK)) {
racct_set_force(td->td_proc, RACCT_VMEM,
map->size);
PROC_UNLOCK(td->td_proc);
return (ENOMEM);
}
error = racct_set(td->td_proc, RACCT_MEMLOCK,
ptoa(vmspace_wired_count(td->td_proc->p_vmspace)) +
size);
if (error != 0) {
racct_set_force(td->td_proc, RACCT_VMEM,
map->size);
PROC_UNLOCK(td->td_proc);
return (error);
}
}
PROC_UNLOCK(td->td_proc);
}

33
sys/vm/vm_unix.c
View File

@ -77,13 +77,14 @@ sys_obreak(td, uap)
{
struct vmspace *vm = td->td_proc->p_vmspace;
vm_offset_t new, old, base;
rlim_t datalim, vmemlim;
rlim_t datalim, lmemlim, vmemlim;
int prot, rv;
int error = 0;
boolean_t do_map_wirefuture;
PROC_LOCK(td->td_proc);
datalim = lim_cur(td->td_proc, RLIMIT_DATA);
lmemlim = lim_cur(td->td_proc, RLIMIT_MEMLOCK);
vmemlim = lim_cur(td->td_proc, RLIMIT_VMEM);
PROC_UNLOCK(td->td_proc);
@ -116,6 +117,13 @@ sys_obreak(td, uap)
goto done;
}
if (new > old) {
if (!old_mlock && vm->vm_map.flags & MAP_WIREFUTURE) {
if (ptoa(vmspace_wired_count(td->td_proc->p_vmspace)) +
(new - old) > lmemlim) {
error = ENOMEM;
goto done;
}
}
if (vm->vm_map.size + (new - old) > vmemlim) {
error = ENOMEM;
goto done;
@ -136,6 +144,20 @@ sys_obreak(td, uap)
error = ENOMEM;
goto done;
}
if (!old_mlock && vm->vm_map.flags & MAP_WIREFUTURE) {
error = racct_set(td->td_proc, RACCT_MEMLOCK,
ptoa(vmspace_wired_count(td->td_proc->p_vmspace)) +
(new - old));
if (error != 0) {
racct_set_force(td->td_proc, RACCT_DATA,
old - base);
racct_set_force(td->td_proc, RACCT_VMEM,
vm->vm_map.size);
PROC_UNLOCK(td->td_proc);
error = ENOMEM;
goto done;
}
}
PROC_UNLOCK(td->td_proc);
#endif
prot = VM_PROT_RW;
@ -152,6 +174,11 @@ sys_obreak(td, uap)
PROC_LOCK(td->td_proc);
racct_set_force(td->td_proc, RACCT_DATA, old - base);
racct_set_force(td->td_proc, RACCT_VMEM, vm->vm_map.size);
if (!old_mlock && vm->vm_map.flags & MAP_WIREFUTURE) {
racct_set_force(td->td_proc, RACCT_MEMLOCK,
ptoa(vmspace_wired_count(
td->td_proc->p_vmspace)));
}
PROC_UNLOCK(td->td_proc);
#endif
error = ENOMEM;
@ -183,6 +210,10 @@ sys_obreak(td, uap)
PROC_LOCK(td->td_proc);
racct_set_force(td->td_proc, RACCT_DATA, new - base);
racct_set_force(td->td_proc, RACCT_VMEM, vm->vm_map.size);
if (!old_mlock && vm->vm_map.flags & MAP_WIREFUTURE) {
racct_set_force(td->td_proc, RACCT_MEMLOCK,
ptoa(vmspace_wired_count(td->td_proc->p_vmspace)));
}
PROC_UNLOCK(td->td_proc);
#endif
}