fs/xfs/linux-2.6/xfs_stats.c

   1 /*
   2  * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
   3  * All Rights Reserved.
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it would be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write the Free Software Foundation,
  16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  17  */
  18 #include "xfs.h"
  19 #include <linux/proc_fs.h>
  20
  21 DEFINE_PER_CPU(struct xfsstats, xfsstats);
  22
  23 STATIC int
  24 xfs_read_xfsstats(
  25         char            *buffer,
  26         char            **start,
  27         off_t           offset,
  28         int             count,
  29         int             *eof,
  30         void            *data)
  31 {
  32         int             c, i, j, len, val;
  33         __uint64_t      xs_xstrat_bytes = 0;
  34         __uint64_t      xs_write_bytes = 0;
  35         __uint64_t      xs_read_bytes = 0;
  36
  37         static const struct xstats_entry {
  38                 char    *desc;
  39                 int     endpoint;
  40         } xstats[] = {
  41                 { "extent_alloc",       XFSSTAT_END_EXTENT_ALLOC        },
  42                 { "abt",                XFSSTAT_END_ALLOC_BTREE         },
  43                 { "blk_map",            XFSSTAT_END_BLOCK_MAPPING       },
  44                 { "bmbt",               XFSSTAT_END_BLOCK_MAP_BTREE     },
  45                 { "dir",                XFSSTAT_END_DIRECTORY_OPS       },
  46                 { "trans",              XFSSTAT_END_TRANSACTIONS        },
  47                 { "ig",                 XFSSTAT_END_INODE_OPS           },
  48                 { "log",                XFSSTAT_END_LOG_OPS             },
  49                 { "push_ail",           XFSSTAT_END_TAIL_PUSHING        },
  50                 { "xstrat",             XFSSTAT_END_WRITE_CONVERT       },
  51                 { "rw",                 XFSSTAT_END_READ_WRITE_OPS      },
  52                 { "attr",               XFSSTAT_END_ATTRIBUTE_OPS       },
  53                 { "icluster",           XFSSTAT_END_INODE_CLUSTER       },
  54                 { "vnodes",             XFSSTAT_END_VNODE_OPS           },
  55                 { "buf",                XFSSTAT_END_BUF                 },
  56         };
  57
  58         /* Loop over all stats groups */
  59         for (i=j=len = 0; i < ARRAY_SIZE(xstats); i++) {
  60                 len += sprintf(buffer + len, xstats[i].desc);
  61                 /* inner loop does each group */
  62                 while (j < xstats[i].endpoint) {
  63                         val = 0;
  64                         /* sum over all cpus */
  65                         for_each_possible_cpu(c)
  66                                 val += *(((__u32*)&per_cpu(xfsstats, c) + j));
  67                         len += sprintf(buffer + len, " %u", val);
  68                         j++;
  69                 }
  70                 buffer[len++] = '\n';
  71         }
  72         /* extra precision counters */
  73         for_each_possible_cpu(i) {
  74                 xs_xstrat_bytes += per_cpu(xfsstats, i).xs_xstrat_bytes;
  75                 xs_write_bytes += per_cpu(xfsstats, i).xs_write_bytes;
  76                 xs_read_bytes += per_cpu(xfsstats, i).xs_read_bytes;
  77         }
  78
  79         len += sprintf(buffer + len, "xpc %Lu %Lu %Lu\n",
  80                         xs_xstrat_bytes, xs_write_bytes, xs_read_bytes);
  81         len += sprintf(buffer + len, "debug %u\n",
  82 #if defined(DEBUG)
  83                 1);
  84 #else
  85                 0);
  86 #endif
  87
  88         if (offset >= len) {
  89                 *start = buffer;
  90                 *eof = 1;
  91                 return 0;
  92         }
  93         *start = buffer + offset;
  94         if ((len -= offset) > count)
  95                 return count;
  96         *eof = 1;
  97
  98         return len;
  99 }
 100
 101 void
 102 xfs_init_procfs(void)
 103 {
 104         if (!proc_mkdir("fs/xfs", NULL))
 105                 return;
 106         create_proc_read_entry("fs/xfs/stat", 0, NULL, xfs_read_xfsstats, NULL);
 107 }
 108
 109 void
 110 xfs_cleanup_procfs(void)
 111 {
 112         remove_proc_entry("fs/xfs/stat", NULL);
 113         remove_proc_entry("fs/xfs", NULL);
 114 }