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uvm_object.c
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uvm_object.c
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/* $NetBSD: uvm_object.c,v 1.6 2008/04/28 20:24:12 martin Exp $ */
/*
* Copyright (c) 2006 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Mindaugas Rasiukevicius.
*
* 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.
*
* 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.
*/
/*
* uvm_object.c: operate with memory objects
*
* TODO:
* 1. Support PG_RELEASED-using objects
*
*/
#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: uvm_object.c,v 1.6 2008/04/28 20:24:12 martin Exp $");
#include "opt_uvmhist.h"
#include <sys/param.h>
#include <uvm/uvm.h>
/* We will fetch this page count per step */
#define FETCH_PAGECOUNT 16
/*
* uobj_wirepages: wire the pages of entire uobj
*
* => NOTE: this function should only be used for types of objects
* where PG_RELEASED flag is never set (aobj objects)
* => caller must pass page-aligned start and end values
*/
int
uobj_wirepages(struct uvm_object *uobj, off_t start, off_t end)
{
int i, npages, error;
struct vm_page *pgs[FETCH_PAGECOUNT], *pg = NULL;
off_t offset = start, left;
left = (end - start) >> PAGE_SHIFT;
mutex_enter(&uobj->vmobjlock);
while (left) {
npages = MIN(FETCH_PAGECOUNT, left);
/* Get the pages */
memset(pgs, 0, sizeof(pgs));
error = (*uobj->pgops->pgo_get)(uobj, offset, pgs, &npages, 0,
VM_PROT_READ | VM_PROT_WRITE, UVM_ADV_SEQUENTIAL,
PGO_ALLPAGES | PGO_SYNCIO);
if (error)
goto error;
mutex_enter(&uobj->vmobjlock);
for (i = 0; i < npages; i++) {
KASSERT(pgs[i] != NULL);
KASSERT(!(pgs[i]->flags & PG_RELEASED));
/*
* Loan break
*/
if (pgs[i]->loan_count) {
while (pgs[i]->loan_count) {
pg = uvm_loanbreak(pgs[i]);
if (!pg) {
mutex_exit(&uobj->vmobjlock);
uvm_wait("uobjwirepg");
mutex_enter(&uobj->vmobjlock);
continue;
}
}
pgs[i] = pg;
}
if (pgs[i]->pqflags & PQ_AOBJ) {
pgs[i]->flags &= ~(PG_CLEAN);
uao_dropswap(uobj, i);
}
}
/* Wire the pages */
mutex_enter(&uvm_pageqlock);
for (i = 0; i < npages; i++) {
uvm_pagewire(pgs[i]);
}
mutex_exit(&uvm_pageqlock);
/* Unbusy the pages */
uvm_page_unbusy(pgs, npages);
left -= npages;
offset += npages << PAGE_SHIFT;
}
mutex_exit(&uobj->vmobjlock);
return 0;
error:
/* Unwire the pages which has been wired */
uobj_unwirepages(uobj, start, offset);
return error;
}
/*
* uobj_unwirepages: unwire the pages of entire uobj
*
* => NOTE: this function should only be used for types of objects
* where PG_RELEASED flag is never set
* => caller must pass page-aligned start and end values
*/
void
uobj_unwirepages(struct uvm_object *uobj, off_t start, off_t end)
{
struct vm_page *pg;
off_t offset;
mutex_enter(&uobj->vmobjlock);
mutex_enter(&uvm_pageqlock);
for (offset = start; offset < end; offset += PAGE_SIZE) {
pg = uvm_pagelookup(uobj, offset);
KASSERT(pg != NULL);
KASSERT(!(pg->flags & PG_RELEASED));
uvm_pageunwire(pg);
}
mutex_exit(&uvm_pageqlock);
mutex_exit(&uobj->vmobjlock);
}