Annotation of src/sys/uvm/uvm_object.c, Revision 1.3
1.3 ! rmind 1: /* $NetBSD: uvm_object.c,v 1.2 2006/10/12 10:13:35 yamt Exp $ */
1.1 yamt 2:
3: /*
4: * Copyright (c) 2006 The NetBSD Foundation, Inc.
5: * All rights reserved.
6: *
1.3 ! rmind 7: * This code is derived from software contributed to The NetBSD Foundation
! 8: * by Mindaugas Rasiukevicius.
! 9: *
1.1 yamt 10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
18: * 3. All advertising materials mentioning features or use of this software
19: * must display the following acknowledgement:
20: * This product includes software developed by the NetBSD
21: * Foundation, Inc. and its contributors.
22: * 4. Neither the name of The NetBSD Foundation nor the names of its
23: * contributors may be used to endorse or promote products derived
24: * from this software without specific prior written permission.
25: *
26: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
27: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
29: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
30: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
31: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
32: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
33: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
34: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
35: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
36: * POSSIBILITY OF SUCH DAMAGE.
37: */
38:
39: /*
40: * uvm_object.c: operate with memory objects
41: *
42: * TODO:
43: * 1. Support PG_RELEASED-using objects
44: *
45: */
46:
47: #include <sys/cdefs.h>
1.3 ! rmind 48: __KERNEL_RCSID(0, "$NetBSD: uvm_object.c,v 1.2 2006/10/12 10:13:35 yamt Exp $");
1.1 yamt 49:
50: #include "opt_uvmhist.h"
51:
52: #include <sys/param.h>
53: #include <sys/lock.h>
54:
55: #include <uvm/uvm.h>
56:
57: /* We will fetch this page count per step */
58: #define FETCH_PAGECOUNT 16
59:
60: /*
61: * uobj_wirepages: wire the pages of entire uobj
62: *
63: * => NOTE: this function should only be used for types of objects
64: * where PG_RELEASED flag is never set (aobj objects)
65: * => caller must pass page-aligned start and end values
66: */
67:
68: int
69: uobj_wirepages(struct uvm_object *uobj, off_t start, off_t end)
70: {
71: int i, npages, error;
72: struct vm_page *pgs[FETCH_PAGECOUNT], *pg = NULL;
73: off_t offset = start, left;
74:
75: left = (end - start) >> PAGE_SHIFT;
76:
77: simple_lock(&uobj->vmobjlock);
78: while (left) {
79:
80: npages = MIN(FETCH_PAGECOUNT, left);
81:
82: /* Get the pages */
83: memset(pgs, 0, sizeof(pgs));
84: error = (*uobj->pgops->pgo_get)(uobj, offset, pgs, &npages, 0,
85: VM_PROT_READ | VM_PROT_WRITE, UVM_ADV_SEQUENTIAL,
86: PGO_ALLPAGES | PGO_SYNCIO);
87:
88: if (error)
89: goto error;
90:
91: simple_lock(&uobj->vmobjlock);
92: for (i = 0; i < npages; i++) {
93:
94: KASSERT(pgs[i] != NULL);
95: KASSERT(!(pgs[i]->flags & PG_RELEASED));
96:
97: /*
98: * Loan break
99: */
100: if (pgs[i]->loan_count) {
101: while (pgs[i]->loan_count) {
102: pg = uvm_loanbreak(pgs[i]);
103: if (!pg) {
104: simple_unlock(&uobj->vmobjlock);
105: uvm_wait("uobjwirepg");
106: simple_lock(&uobj->vmobjlock);
107: continue;
108: }
109: }
110: pgs[i] = pg;
111: }
112:
113: if (pgs[i]->pqflags & PQ_AOBJ) {
114: pgs[i]->flags &= ~(PG_CLEAN);
115: uao_dropswap(uobj, i);
116: }
117: }
118:
119: /* Wire the pages */
120: uvm_lock_pageq();
121: for (i = 0; i < npages; i++) {
122: uvm_pagewire(pgs[i]);
123: }
124: uvm_unlock_pageq();
125:
126: /* Unbusy the pages */
127: uvm_page_unbusy(pgs, npages);
128:
129: left -= npages;
130: offset += npages << PAGE_SHIFT;
131: }
132: simple_unlock(&uobj->vmobjlock);
133:
134: return 0;
135:
136: error:
137: /* Unwire the pages which has been wired */
138: uobj_unwirepages(uobj, start, offset);
139:
140: return error;
141: }
142:
143: /*
144: * uobj_unwirepages: unwire the pages of entire uobj
145: *
146: * => NOTE: this function should only be used for types of objects
147: * where PG_RELEASED flag is never set
148: * => caller must pass page-aligned start and end values
149: */
150:
151: void
152: uobj_unwirepages(struct uvm_object *uobj, off_t start, off_t end)
153: {
154: struct vm_page *pg;
155: off_t offset;
156:
157: simple_lock(&uobj->vmobjlock);
158: uvm_lock_pageq();
159: for (offset = start; offset < end; offset += PAGE_SIZE) {
160: pg = uvm_pagelookup(uobj, offset);
161:
162: KASSERT(pg != NULL);
163: KASSERT(!(pg->flags & PG_RELEASED));
164:
165: uvm_pageunwire(pg);
166: }
167: uvm_unlock_pageq();
168: simple_unlock(&uobj->vmobjlock);
169: }
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