lustre/obdclass/linux/linux-sysctl.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * GPL HEADER START
   5  *
   6  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License version 2 only,
  10  * as published by the Free Software Foundation.
  11  *
  12  * This program is distributed in the hope that it will be useful, but
  13  * WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15  * General Public License version 2 for more details (a copy is included
  16  * in the LICENSE file that accompanied this code).
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * version 2 along with this program; If not, see [sun.com URL with a
  20  * copy of GPLv2].
  21  *
  22  * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
  23  * CA 95054 USA or visit www.sun.com if you need additional information or
  24  * have any questions.
  25  *
  26  * GPL HEADER END
  27  */
  28 /*
  29  * Copyright  2008 Sun Microsystems, Inc. All rights reserved
  30  * Use is subject to license terms.
  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/autoconf.h>
  39 #include <linux/sysctl.h>
  40 #include <linux/sched.h>
  41 #include <linux/mm.h>
  42 #include <linux/sysctl.h>
  43 #include <linux/version.h>
  44 #include <linux/proc_fs.h>
  45 #include <linux/slab.h>
  46 #include <linux/stat.h>
  47 #include <linux/ctype.h>
  48 #include <asm/bitops.h>
  49 #include <asm/uaccess.h>
  50 #include <linux/utsname.h>
  51
  52 #define DEBUG_SUBSYSTEM S_CLASS
  53
  54 #include <obd_support.h>
  55 #include <lprocfs_status.h>
  56
  57 cfs_sysctl_table_header_t *obd_table_header = NULL;
  58
  59 #define OBD_SYSCTL 300
  60
  61 enum {
  62         OBD_FAIL_LOC = 1,       /* control test failures instrumentation */
  63         OBD_FAIL_VAL,           /* userdata for fail loc */
  64         OBD_TIMEOUT,            /* RPC timeout before recovery/intr */
  65         OBD_DUMP_ON_TIMEOUT,    /* dump kernel debug log upon eviction */
  66         OBD_MEMUSED,            /* bytes currently OBD_ALLOCated */
  67         OBD_PAGESUSED,          /* pages currently OBD_PAGE_ALLOCated */
  68         OBD_MAXMEMUSED,         /* maximum bytes OBD_ALLOCated concurrently */
  69         OBD_MAXPAGESUSED,       /* maximum pages OBD_PAGE_ALLOCated concurrently */
  70         OBD_SYNCFILTER,         /* XXX temporary, as we play with sync osts.. */
  71         OBD_LDLM_TIMEOUT,       /* LDLM timeout for ASTs before client eviction */
  72         OBD_DUMP_ON_EVICTION,   /* dump kernel debug log upon eviction */
  73         OBD_DEBUG_PEER_ON_TIMEOUT, /* dump peer debug when RPC times out */
  74         OBD_ALLOC_FAIL_RATE,    /* memory allocation random failure rate */
  75         OBD_MAX_DIRTY_PAGES,    /* maximum dirty pages */
  76 };
  77
  78 int LL_PROC_PROTO(proc_fail_loc)
  79 {
  80         int rc;
  81         long old_fail_loc = obd_fail_loc;
  82
  83         rc = ll_proc_dointvec(table, write, filp, buffer, lenp, ppos);
  84         if (old_fail_loc != obd_fail_loc)
  85                 wake_up(&obd_race_waitq);
  86         return rc;
  87 }
  88
  89 int LL_PROC_PROTO(proc_set_timeout)
  90 {
  91         int rc;
  92
  93         rc = ll_proc_dointvec(table, write, filp, buffer, lenp, ppos);
  94         if (ldlm_timeout >= obd_timeout)
  95                 ldlm_timeout = max(obd_timeout / 3, 1U);
  96         return rc;
  97 }
  98
  99 int LL_PROC_PROTO(proc_memory_alloc)
 100 {
 101         char buf[22];
 102         int len;
 103         DECLARE_LL_PROC_PPOS_DECL;
 104
 105         if (!*lenp || (*ppos && !write)) {
 106                 *lenp = 0;
 107                 return 0;
 108         }
 109         if (write)
 110                 return -EINVAL;
 111
 112         len = snprintf(buf, sizeof(buf), LPU64"\n", obd_memory_sum());
 113         if (len > *lenp)
 114                 len = *lenp;
 115         buf[len] = '\0';
 116         if (copy_to_user(buffer, buf, len))
 117                 return -EFAULT;
 118         *lenp = len;
 119         *ppos += *lenp;
 120         return 0;
 121 }
 122
 123 int LL_PROC_PROTO(proc_pages_alloc)
 124 {
 125         char buf[22];
 126         int len;
 127         DECLARE_LL_PROC_PPOS_DECL;
 128
 129         if (!*lenp || (*ppos && !write)) {
 130                 *lenp = 0;
 131                 return 0;
 132         }
 133         if (write)
 134                 return -EINVAL;
 135
 136         len = snprintf(buf, sizeof(buf), LPU64"\n", obd_pages_sum());
 137         if (len > *lenp)
 138                 len = *lenp;
 139         buf[len] = '\0';
 140         if (copy_to_user(buffer, buf, len))
 141                 return -EFAULT;
 142         *lenp = len;
 143         *ppos += *lenp;
 144         return 0;
 145 }
 146
 147 int LL_PROC_PROTO(proc_mem_max)
 148 {
 149         char buf[22];
 150         int len;
 151         DECLARE_LL_PROC_PPOS_DECL;
 152
 153         if (!*lenp || (*ppos && !write)) {
 154                 *lenp = 0;
 155                 return 0;
 156         }
 157         if (write)
 158                 return -EINVAL;
 159
 160         len = snprintf(buf, sizeof(buf), LPU64"\n", obd_memory_max());
 161         if (len > *lenp)
 162                 len = *lenp;
 163         buf[len] = '\0';
 164         if (copy_to_user(buffer, buf, len))
 165                 return -EFAULT;
 166         *lenp = len;
 167         *ppos += *lenp;
 168         return 0;
 169 }
 170
 171 int LL_PROC_PROTO(proc_pages_max)
 172 {
 173         char buf[22];
 174         int len;
 175         DECLARE_LL_PROC_PPOS_DECL;
 176
 177         if (!*lenp || (*ppos && !write)) {
 178                 *lenp = 0;
 179                 return 0;
 180         }
 181         if (write)
 182                 return -EINVAL;
 183
 184         len = snprintf(buf, sizeof(buf), LPU64"\n", obd_pages_max());
 185         if (len > *lenp)
 186                 len = *lenp;
 187         buf[len] = '\0';
 188         if (copy_to_user(buffer, buf, len))
 189                 return -EFAULT;
 190         *lenp = len;
 191         *ppos += *lenp;
 192         return 0;
 193 }
 194
 195 int LL_PROC_PROTO(proc_max_dirty_pages_in_mb)
 196 {
 197         int rc = 0;
 198
 199         if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
 200                 *lenp = 0;
 201                 return 0;
 202         }
 203         if (write) {
 204                 rc = lprocfs_write_frac_helper(buffer, *lenp,
 205                                                (unsigned int*)table->data,
 206                                                1 << (20 - CFS_PAGE_SHIFT));
 207                 /* Don't allow them to let dirty pages exceed 90% of system memory,
 208                  * and set a hard minimum of 4MB. */
 209                 if (obd_max_dirty_pages > ((num_physpages / 10) * 9)) {
 210                         CERROR("Refusing to set max dirty pages to %u, which "
 211                                "is more than 90%% of available RAM; setting to %lu\n",
 212                                obd_max_dirty_pages, ((num_physpages / 10) * 9));
 213                         obd_max_dirty_pages = ((num_physpages / 10) * 9);
 214                 } else if (obd_max_dirty_pages < 4 << (20 - CFS_PAGE_SHIFT)) {
 215                         obd_max_dirty_pages = 4 << (20 - CFS_PAGE_SHIFT);
 216                 }
 217         } else {
 218                 char buf[21];
 219                 int len;
 220
 221                 len = lprocfs_read_frac_helper(buf, sizeof(buf),
 222                                                *(unsigned int*)table->data,
 223                                                1 << (20 - CFS_PAGE_SHIFT));
 224                 if (len > *lenp)
 225                         len = *lenp;
 226                 buf[len] = '\0';
 227                 if (copy_to_user(buffer, buf, len))
 228                         return -EFAULT;
 229                 *lenp = len;
 230         }
 231         *ppos += *lenp;
 232         return rc;
 233 }
 234
 235 #ifdef RANDOM_FAIL_ALLOC
 236 int LL_PROC_PROTO(proc_alloc_fail_rate)
 237 {
 238         int rc          = 0;
 239         DECLARE_LL_PROC_PPOS_DECL;
 240
 241         if (!table->data || !table->maxlen || !*lenp || (*ppos && !write)) {
 242                 *lenp = 0;
 243                 return 0;
 244         }
 245         if (write) {
 246                 rc = lprocfs_write_frac_helper(buffer, *lenp,
 247                                                (unsigned int*)table->data,
 248                                                OBD_ALLOC_FAIL_MULT);
 249         } else {
 250                 char buf[21];
 251                 int  len;
 252
 253                 len = lprocfs_read_frac_helper(buf, 21,
 254                                                *(unsigned int*)table->data,
 255                                                OBD_ALLOC_FAIL_MULT);
 256                 if (len > *lenp)
 257                         len = *lenp;
 258                 buf[len] = '\0';
 259                 if (copy_to_user(buffer, buf, len))
 260                         return -EFAULT;
 261                 *lenp = len;
 262         }
 263         *ppos += *lenp;
 264         return rc;
 265 }
 266 #endif
 267
 268 static cfs_sysctl_table_t obd_table[] = {
 269         {
 270                 .ctl_name = OBD_FAIL_LOC,
 271                 .procname = "fail_loc",
 272                 .data     = &obd_fail_loc,
 273                 .maxlen   = sizeof(int),
 274                 .mode     = 0644,
 275                 .proc_handler = &proc_fail_loc
 276         },
 277         {
 278                 .ctl_name = OBD_FAIL_VAL,
 279                 .procname = "fail_val",
 280                 .data     = &obd_fail_val,
 281                 .maxlen   = sizeof(int),
 282                 .mode     = 0644,
 283                 .proc_handler = &proc_dointvec
 284         },
 285         {
 286                 .ctl_name = OBD_TIMEOUT,
 287                 .procname = "timeout",
 288                 .data     = &obd_timeout,
 289                 .maxlen   = sizeof(int),
 290                 .mode     = 0644,
 291                 .proc_handler = &proc_set_timeout
 292         },
 293         {
 294                 .ctl_name = OBD_DEBUG_PEER_ON_TIMEOUT,
 295                 .procname = "debug_peer_on_timeout",
 296                 .data     = &obd_debug_peer_on_timeout,
 297                 .maxlen   = sizeof(int),
 298                 .mode     = 0644,
 299                 .proc_handler = &proc_dointvec
 300         },
 301         {
 302                 .ctl_name = OBD_DUMP_ON_TIMEOUT,
 303                 .procname = "dump_on_timeout",
 304                 .data     = &obd_dump_on_timeout,
 305                 .maxlen   = sizeof(int),
 306                 .mode     = 0644,
 307                 .proc_handler = &proc_dointvec
 308         },
 309         {
 310                 .ctl_name = OBD_DUMP_ON_EVICTION,
 311                 .procname = "dump_on_eviction",
 312                 .data     = &obd_dump_on_eviction,
 313                 .maxlen   = sizeof(int),
 314                 .mode     = 0644,
 315                 .proc_handler = &proc_dointvec
 316         },
 317         {
 318                 .ctl_name = OBD_MEMUSED,
 319                 .procname = "memused",
 320                 .data     = NULL,
 321                 .maxlen   = 0,
 322                 .mode     = 0444,
 323                 .proc_handler = &proc_memory_alloc
 324         },
 325         {
 326                 .ctl_name = OBD_PAGESUSED,
 327                 .procname = "pagesused",
 328                 .data     = NULL,
 329                 .maxlen   = 0,
 330                 .mode     = 0444,
 331                 .proc_handler = &proc_pages_alloc
 332         },
 333         {
 334                 .ctl_name = OBD_MAXMEMUSED,
 335                 .procname = "memused_max",
 336                 .data     = NULL,
 337                 .maxlen   = 0,
 338                 .mode     = 0444,
 339                 .proc_handler = &proc_mem_max
 340         },
 341         {
 342                 .ctl_name = OBD_MAXPAGESUSED,
 343                 .procname = "pagesused_max",
 344                 .data     = NULL,
 345                 .maxlen   = 0,
 346                 .mode     = 0444,
 347                 .proc_handler = &proc_pages_max
 348         },
 349         {
 350                 .ctl_name = OBD_LDLM_TIMEOUT,
 351                 .procname = "ldlm_timeout",
 352                 .data     = &ldlm_timeout,
 353                 .maxlen   = sizeof(int),
 354                 .mode     = 0644,
 355                 .proc_handler = &proc_set_timeout
 356         },
 357 #ifdef RANDOM_FAIL_LOC
 358         {
 359                 .ctl_name = OBD_ALLOC_FAIL_RATE,
 360                 .procname = "alloc_fail_rate",
 361                 .data     = &obd_alloc_fail_rate,
 362                 .maxlen   = sizeof(int),
 363                 .mode     = 0644,
 364                 .proc_handler = &proc_alloc_fail_rate
 365         },
 366 #endif
 367         {
 368                 .ctl_name = OBD_MAX_DIRTY_PAGES,
 369                 .procname = "max_dirty_mb",
 370                 .data     = &obd_max_dirty_pages,
 371                 .maxlen   = sizeof(int),
 372                 .mode     = 0644,
 373                 .proc_handler = &proc_max_dirty_pages_in_mb
 374         },
 375         { 0 }
 376 };
 377
 378 static cfs_sysctl_table_t parent_table[] = {
 379         {
 380                 .ctl_name = OBD_SYSCTL,
 381                 .procname = "lustre",
 382                 .data     = NULL,
 383                 .maxlen   = 0,
 384                 .mode     = 0555,
 385                 .child    = obd_table
 386         },
 387         {0}
 388 };
 389
 390 void obd_sysctl_init (void)
 391 {
 392 #ifdef CONFIG_SYSCTL
 393         if ( !obd_table_header )
 394                 obd_table_header = cfs_register_sysctl_table(parent_table, 0);
 395 #endif
 396 }
 397
 398 void obd_sysctl_clean (void)
 399 {
 400 #ifdef CONFIG_SYSCTL
 401         if ( obd_table_header )
 402                 cfs_unregister_sysctl_table(obd_table_header);
 403         obd_table_header = NULL;
 404 #endif
 405 }