1 /*
2 * GPL HEADER START
3 *
4 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
5 *
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.
9 *
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).
15 *
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.sun.com/software/products/lustre/docs/GPLv2.pdf
19 *
20 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
21 * CA 95054 USA or visit www.sun.com if you need additional information or
22 * have any questions.
23 *
24 * GPL HEADER END
25 */
26 /*
27 * Copyright (c) 1999, 2010, Oracle and/or its affiliates. All rights reserved.
28 * Use is subject to license terms.
29 *
30 * Copyright (c) 2011, Intel Corporation.
31 */
32 /*
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
35 */
36
37 #include <linux/module.h>
38 #include <linux/sysctl.h>
39 #include <linux/sched.h>
40 #include <linux/mm.h>
41 #include <linux/proc_fs.h>
42 #include <linux/slab.h>
43 #include <linux/stat.h>
44 #include <linux/ctype.h>
45 #include <linux/bitops.h>
46 #include <linux/uaccess.h>
47 #include <linux/utsname.h>
48
49 #define DEBUG_SUBSYSTEM S_CLASS
50
51 #include "../../include/obd_support.h"
52 #include "../../include/lprocfs_status.h"
53
54 #ifdef CONFIG_SYSCTL
55 static struct ctl_table_header *obd_table_header;
56 #endif
57
58
59 #define OBD_SYSCTL 300
60
61 enum {
62 OBD_TIMEOUT = 3, /* RPC timeout before recovery/intr */
63 OBD_DUMP_ON_TIMEOUT, /* dump kernel debug log upon eviction */
64 OBD_MEMUSED, /* bytes currently OBD_ALLOCated */
65 OBD_PAGESUSED, /* pages currently OBD_PAGE_ALLOCated */
66 OBD_MAXMEMUSED, /* maximum bytes OBD_ALLOCated concurrently */
67 OBD_MAXPAGESUSED, /* maximum pages OBD_PAGE_ALLOCated concurrently */
68 OBD_SYNCFILTER, /* XXX temporary, as we play with sync osts.. */
69 OBD_LDLM_TIMEOUT, /* LDLM timeout for ASTs before client eviction */
70 OBD_DUMP_ON_EVICTION, /* dump kernel debug log upon eviction */
71 OBD_DEBUG_PEER_ON_TIMEOUT, /* dump peer debug when RPC times out */
72 OBD_ALLOC_FAIL_RATE, /* memory allocation random failure rate */
73 OBD_MAX_DIRTY_PAGES, /* maximum dirty pages */
74 OBD_AT_MIN, /* Adaptive timeouts params */
75 OBD_AT_MAX,
76 OBD_AT_EXTRA,
77 OBD_AT_EARLY_MARGIN,
78 OBD_AT_HISTORY,
79 };
80
81
82 #ifdef CONFIG_SYSCTL
proc_set_timeout(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)83 static int proc_set_timeout(struct ctl_table *table, int write,
84 void __user *buffer, size_t *lenp, loff_t *ppos)
85 {
86 int rc;
87
88 rc = proc_dointvec(table, write, buffer, lenp, ppos);
89 if (ldlm_timeout >= obd_timeout)
90 ldlm_timeout = max(obd_timeout / 3, 1U);
91 return rc;
92 }
93
proc_memory_alloc(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)94 static int proc_memory_alloc(struct ctl_table *table, int write,
95 void __user *buffer, size_t *lenp, loff_t *ppos)
96 {
97 char buf[22];
98 int len;
99
100 if (!*lenp || (*ppos && !write)) {
101 *lenp = 0;
102 return 0;
103 }
104 if (write)
105 return -EINVAL;
106
107 len = snprintf(buf, sizeof(buf), "%llu\n", obd_memory_sum());
108 if (len > *lenp)
109 len = *lenp;
110 buf[len] = '\0';
111 if (copy_to_user(buffer, buf, len))
112 return -EFAULT;
113 *lenp = len;
114 *ppos += *lenp;
115 return 0;
116 }
117
proc_pages_alloc(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)118 static int proc_pages_alloc(struct ctl_table *table, int write,
119 void __user *buffer, size_t *lenp, loff_t *ppos)
120 {
121 char buf[22];
122 int len;
123
124 if (!*lenp || (*ppos && !write)) {
125 *lenp = 0;
126 return 0;
127 }
128 if (write)
129 return -EINVAL;
130
131 len = snprintf(buf, sizeof(buf), "%llu\n", obd_pages_sum());
132 if (len > *lenp)
133 len = *lenp;
134 buf[len] = '\0';
135 if (copy_to_user(buffer, buf, len))
136 return -EFAULT;
137 *lenp = len;
138 *ppos += *lenp;
139 return 0;
140 }
141
proc_mem_max(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)142 static int proc_mem_max(struct ctl_table *table, int write, void __user *buffer,
143 size_t *lenp, loff_t *ppos)
144 {
145 char buf[22];
146 int len;
147
148 if (!*lenp || (*ppos && !write)) {
149 *lenp = 0;
150 return 0;
151 }
152 if (write)
153 return -EINVAL;
154
155 len = snprintf(buf, sizeof(buf), "%llu\n", obd_memory_max());
156 if (len > *lenp)
157 len = *lenp;
158 buf[len] = '\0';
159 if (copy_to_user(buffer, buf, len))
160 return -EFAULT;
161 *lenp = len;
162 *ppos += *lenp;
163 return 0;
164 }
165
proc_pages_max(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)166 static int proc_pages_max(struct ctl_table *table, int write,
167 void __user *buffer, size_t *lenp, loff_t *ppos)
168 {
169 char buf[22];
170 int len;
171
172 if (!*lenp || (*ppos && !write)) {
173 *lenp = 0;
174 return 0;
175 }
176 if (write)
177 return -EINVAL;
178
179 len = snprintf(buf, sizeof(buf), "%llu\n", obd_pages_max());
180 if (len > *lenp)
181 len = *lenp;
182 buf[len] = '\0';
183 if (copy_to_user(buffer, buf, len))
184 return -EFAULT;
185 *lenp = len;
186 *ppos += *lenp;
187 return 0;
188 }
189
proc_max_dirty_pages_in_mb(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)190 static int proc_max_dirty_pages_in_mb(struct ctl_table *table, int write,
191 void __user *buffer, size_t *lenp, loff_t *ppos)
192 {
193 int rc = 0;
194
195 if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
196 *lenp = 0;
197 return 0;
198 }
199 if (write) {
200 rc = lprocfs_write_frac_helper(buffer, *lenp,
201 (unsigned int *)table->data,
202 1 << (20 - PAGE_CACHE_SHIFT));
203 /* Don't allow them to let dirty pages exceed 90% of system
204 * memory and set a hard minimum of 4MB. */
205 if (obd_max_dirty_pages > ((totalram_pages / 10) * 9)) {
206 CERROR("Refusing to set max dirty pages to %u, which is more than 90%% of available RAM; setting to %lu\n",
207 obd_max_dirty_pages,
208 ((totalram_pages / 10) * 9));
209 obd_max_dirty_pages = (totalram_pages / 10) * 9;
210 } else if (obd_max_dirty_pages < 4 << (20 - PAGE_CACHE_SHIFT)) {
211 obd_max_dirty_pages = 4 << (20 - PAGE_CACHE_SHIFT);
212 }
213 } else {
214 char buf[21];
215 int len;
216
217 len = lprocfs_read_frac_helper(buf, sizeof(buf),
218 *(unsigned int *)table->data,
219 1 << (20 - PAGE_CACHE_SHIFT));
220 if (len > *lenp)
221 len = *lenp;
222 buf[len] = '\0';
223 if (copy_to_user(buffer, buf, len))
224 return -EFAULT;
225 *lenp = len;
226 }
227 *ppos += *lenp;
228 return rc;
229 }
230
proc_alloc_fail_rate(struct ctl_table * table,int write,void __user * buffer,size_t * lenp,loff_t * ppos)231 static int proc_alloc_fail_rate(struct ctl_table *table, int write,
232 void __user *buffer, size_t *lenp, loff_t *ppos)
233 {
234 int rc = 0;
235
236 if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
237 *lenp = 0;
238 return 0;
239 }
240 if (write) {
241 rc = lprocfs_write_frac_helper(buffer, *lenp,
242 (unsigned int *)table->data,
243 OBD_ALLOC_FAIL_MULT);
244 } else {
245 char buf[21];
246 int len;
247
248 len = lprocfs_read_frac_helper(buf, 21,
249 *(unsigned int *)table->data,
250 OBD_ALLOC_FAIL_MULT);
251 if (len > *lenp)
252 len = *lenp;
253 buf[len] = '\0';
254 if (copy_to_user(buffer, buf, len))
255 return -EFAULT;
256 *lenp = len;
257 }
258 *ppos += *lenp;
259 return rc;
260 }
261
262 static struct ctl_table obd_table[] = {
263 {
264 .procname = "timeout",
265 .data = &obd_timeout,
266 .maxlen = sizeof(int),
267 .mode = 0644,
268 .proc_handler = &proc_set_timeout
269 },
270 {
271 .procname = "debug_peer_on_timeout",
272 .data = &obd_debug_peer_on_timeout,
273 .maxlen = sizeof(int),
274 .mode = 0644,
275 .proc_handler = &proc_dointvec
276 },
277 {
278 .procname = "dump_on_timeout",
279 .data = &obd_dump_on_timeout,
280 .maxlen = sizeof(int),
281 .mode = 0644,
282 .proc_handler = &proc_dointvec
283 },
284 {
285 .procname = "dump_on_eviction",
286 .data = &obd_dump_on_eviction,
287 .maxlen = sizeof(int),
288 .mode = 0644,
289 .proc_handler = &proc_dointvec
290 },
291 {
292 .procname = "memused",
293 .data = NULL,
294 .maxlen = 0,
295 .mode = 0444,
296 .proc_handler = &proc_memory_alloc
297 },
298 {
299 .procname = "pagesused",
300 .data = NULL,
301 .maxlen = 0,
302 .mode = 0444,
303 .proc_handler = &proc_pages_alloc
304 },
305 {
306 .procname = "memused_max",
307 .data = NULL,
308 .maxlen = 0,
309 .mode = 0444,
310 .proc_handler = &proc_mem_max
311 },
312 {
313 .procname = "pagesused_max",
314 .data = NULL,
315 .maxlen = 0,
316 .mode = 0444,
317 .proc_handler = &proc_pages_max
318 },
319 {
320 .procname = "ldlm_timeout",
321 .data = &ldlm_timeout,
322 .maxlen = sizeof(int),
323 .mode = 0644,
324 .proc_handler = &proc_set_timeout
325 },
326 {
327 .procname = "alloc_fail_rate",
328 .data = &obd_alloc_fail_rate,
329 .maxlen = sizeof(int),
330 .mode = 0644,
331 .proc_handler = &proc_alloc_fail_rate
332 },
333 {
334 .procname = "max_dirty_mb",
335 .data = &obd_max_dirty_pages,
336 .maxlen = sizeof(int),
337 .mode = 0644,
338 .proc_handler = &proc_max_dirty_pages_in_mb
339 },
340 {
341 .procname = "at_min",
342 .data = &at_min,
343 .maxlen = sizeof(int),
344 .mode = 0644,
345 .proc_handler = &proc_dointvec,
346 },
347 {
348 .procname = "at_max",
349 .data = &at_max,
350 .maxlen = sizeof(int),
351 .mode = 0644,
352 .proc_handler = &proc_dointvec,
353 },
354 {
355 .procname = "at_extra",
356 .data = &at_extra,
357 .maxlen = sizeof(int),
358 .mode = 0644,
359 .proc_handler = &proc_dointvec,
360 },
361 {
362 .procname = "at_early_margin",
363 .data = &at_early_margin,
364 .maxlen = sizeof(int),
365 .mode = 0644,
366 .proc_handler = &proc_dointvec,
367 },
368 {
369 .procname = "at_history",
370 .data = &at_history,
371 .maxlen = sizeof(int),
372 .mode = 0644,
373 .proc_handler = &proc_dointvec,
374 },
375 {}
376 };
377
378 static struct ctl_table parent_table[] = {
379 {
380 .procname = "lustre",
381 .data = NULL,
382 .maxlen = 0,
383 .mode = 0555,
384 .child = obd_table
385 },
386 {}
387 };
388 #endif
389
obd_sysctl_init(void)390 void obd_sysctl_init(void)
391 {
392 #ifdef CONFIG_SYSCTL
393 if (!obd_table_header)
394 obd_table_header = register_sysctl_table(parent_table);
395 #endif
396 }
397
obd_sysctl_clean(void)398 void obd_sysctl_clean(void)
399 {
400 #ifdef CONFIG_SYSCTL
401 if (obd_table_header)
402 unregister_sysctl_table(obd_table_header);
403 obd_table_header = NULL;
404 #endif
405 }
406