mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-29 12:03:03 +00:00
a77c9610f2
it to lower its memory usage. This was mentioned on the mailing lists ages ago, and I've lost the name of the person who brought it up. Reviewed by: alc
131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
/*
|
|
* Copyright (c) 1988 University of Utah.
|
|
* Copyright (c) 1991, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* This code is derived from software contributed to Berkeley by
|
|
* the Systems Programming Group of the University of Utah Computer
|
|
* Science Department.
|
|
*
|
|
* 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 University of
|
|
* California, Berkeley and its contributors.
|
|
* 4. Neither the name of the University 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 REGENTS 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 REGENTS 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.
|
|
*
|
|
* from: Utah $Hdr: vm_unix.c 1.1 89/11/07$
|
|
*
|
|
* @(#)vm_unix.c 8.1 (Berkeley) 6/11/93
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
/*
|
|
* Traditional sbrk/grow interface to VM
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/sysproto.h>
|
|
#include <sys/proc.h>
|
|
#include <sys/resourcevar.h>
|
|
|
|
#include <vm/vm.h>
|
|
#include <vm/vm_param.h>
|
|
#include <sys/lock.h>
|
|
#include <vm/pmap.h>
|
|
#include <vm/vm_map.h>
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct obreak_args {
|
|
char *nsize;
|
|
};
|
|
#endif
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
obreak(p, uap)
|
|
struct proc *p;
|
|
struct obreak_args *uap;
|
|
{
|
|
register struct vmspace *vm = p->p_vmspace;
|
|
vm_offset_t new, old, base;
|
|
int rv;
|
|
|
|
base = round_page((vm_offset_t) vm->vm_daddr);
|
|
new = round_page((vm_offset_t)uap->nsize);
|
|
old = base + ctob(vm->vm_dsize);
|
|
if (new > base) {
|
|
/*
|
|
* We check resource limits here, but alow processes to
|
|
* reduce their usage, even if they remain over the limit.
|
|
*/
|
|
if (new > old &&
|
|
(new - base) > (unsigned) p->p_rlimit[RLIMIT_DATA].rlim_cur)
|
|
return ENOMEM;
|
|
if (new >= VM_MAXUSER_ADDRESS)
|
|
return (ENOMEM);
|
|
} else if (new < base) {
|
|
/*
|
|
* This is simply an invalid value. If someone wants to
|
|
* do fancy address space manipulations, mmap and munmap
|
|
* can do most of what the user would want.
|
|
*/
|
|
return EINVAL;
|
|
}
|
|
|
|
if (new > old) {
|
|
vm_size_t diff;
|
|
|
|
diff = new - old;
|
|
rv = vm_map_find(&vm->vm_map, NULL, 0, &old, diff, FALSE,
|
|
VM_PROT_ALL, VM_PROT_ALL, 0);
|
|
if (rv != KERN_SUCCESS) {
|
|
return (ENOMEM);
|
|
}
|
|
vm->vm_dsize += btoc(diff);
|
|
} else if (new < old) {
|
|
rv = vm_map_remove(&vm->vm_map, new, old);
|
|
if (rv != KERN_SUCCESS) {
|
|
return (ENOMEM);
|
|
}
|
|
vm->vm_dsize -= btoc(old - new);
|
|
}
|
|
return (0);
|
|
}
|
|
|
|
#ifndef _SYS_SYSPROTO_H_
|
|
struct ovadvise_args {
|
|
int anom;
|
|
};
|
|
#endif
|
|
|
|
/* ARGSUSED */
|
|
int
|
|
ovadvise(p, uap)
|
|
struct proc *p;
|
|
struct ovadvise_args *uap;
|
|
{
|
|
|
|
return (EINVAL);
|
|
}
|