4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License version 2 only,
8 * as published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License version 2 for more details (a copy is included
14 * in the LICENSE file that accompanied this code).
16 * You should have received a copy of the GNU General Public License
17 * version 2 along with this program; If not, see
18 * http://www.gnu.org/licenses/gpl-2.0.html
23 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
24 * Use is subject to license terms.
26 * Copyright (c) 2011, 2015, Intel Corporation.
29 * This file is part of Lustre, http://www.lustre.org/
30 * Lustre is a trademark of Sun Microsystems, Inc.
33 #include <linux/module.h>
34 #include <linux/sysctl.h>
35 #include <linux/sched.h>
37 #include <linux/slab.h>
38 #include <linux/stat.h>
39 #include <linux/ctype.h>
40 #include <linux/bitops.h>
41 #include <linux/uaccess.h>
42 #include <linux/utsname.h>
44 #define DEBUG_SUBSYSTEM S_CLASS
46 #include <obd_support.h>
47 #include <lprocfs_status.h>
48 #include <obd_class.h>
50 struct static_lustre_uintvalue_attr {
52 struct attribute attr;
53 ssize_t (*show)(struct kobject *kobj, struct attribute *attr,
55 ssize_t (*store)(struct kobject *kobj, struct attribute *attr,
56 const char *buf, size_t len);
61 static ssize_t static_uintvalue_show(struct kobject *kobj,
62 struct attribute *attr,
65 struct static_lustre_uintvalue_attr *lattr = (void *)attr;
67 return sprintf(buf, "%d\n", *lattr->value);
70 static ssize_t static_uintvalue_store(struct kobject *kobj,
71 struct attribute *attr,
72 const char *buffer, size_t count)
74 struct static_lustre_uintvalue_attr *lattr = (void *)attr;
78 rc = kstrtouint(buffer, 10, &val);
87 #define LUSTRE_STATIC_UINT_ATTR(name, value) \
88 static struct static_lustre_uintvalue_attr lustre_sattr_##name = \
90 static_uintvalue_show, \
91 static_uintvalue_store),\
94 LUSTRE_STATIC_UINT_ATTR(timeout, &obd_timeout);
96 static ssize_t max_dirty_mb_show(struct kobject *kobj, struct attribute *attr,
99 return sprintf(buf, "%lu\n",
100 obd_max_dirty_pages / (1 << (20 - PAGE_SHIFT)));
103 static ssize_t max_dirty_mb_store(struct kobject *kobj, struct attribute *attr,
104 const char *buffer, size_t count)
109 rc = kstrtoul(buffer, 10, &val);
113 val *= 1 << (20 - PAGE_SHIFT); /* convert to pages */
115 if (val > ((totalram_pages / 10) * 9)) {
116 /* Somebody wants to assign too much memory to dirty pages */
120 if (val < 4 << (20 - PAGE_SHIFT)) {
121 /* Less than 4 Mb for dirty cache is also bad */
125 obd_max_dirty_pages = val;
129 LUSTRE_RW_ATTR(max_dirty_mb);
131 LUSTRE_STATIC_UINT_ATTR(debug_peer_on_timeout, &obd_debug_peer_on_timeout);
132 LUSTRE_STATIC_UINT_ATTR(dump_on_timeout, &obd_dump_on_timeout);
133 LUSTRE_STATIC_UINT_ATTR(dump_on_eviction, &obd_dump_on_eviction);
134 LUSTRE_STATIC_UINT_ATTR(at_min, &at_min);
135 LUSTRE_STATIC_UINT_ATTR(at_max, &at_max);
136 LUSTRE_STATIC_UINT_ATTR(at_extra, &at_extra);
137 LUSTRE_STATIC_UINT_ATTR(at_early_margin, &at_early_margin);
138 LUSTRE_STATIC_UINT_ATTR(at_history, &at_history);
140 static struct attribute *lustre_attrs[] = {
141 &lustre_sattr_timeout.u.attr,
142 &lustre_attr_max_dirty_mb.attr,
143 &lustre_sattr_debug_peer_on_timeout.u.attr,
144 &lustre_sattr_dump_on_timeout.u.attr,
145 &lustre_sattr_dump_on_eviction.u.attr,
146 &lustre_sattr_at_min.u.attr,
147 &lustre_sattr_at_max.u.attr,
148 &lustre_sattr_at_extra.u.attr,
149 &lustre_sattr_at_early_margin.u.attr,
150 &lustre_sattr_at_history.u.attr,
154 static const struct attribute_group lustre_attr_group = {
155 .attrs = lustre_attrs,
158 int obd_sysctl_init(void)
160 return sysfs_create_group(lustre_kobj, &lustre_attr_group);