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                 { "abtb2",              XFSSTAT_END_ABTB_V2             },
  57                 { "abtc2",              XFSSTAT_END_ABTC_V2             },
  58                 { "bmbt2",              XFSSTAT_END_BMBT_V2             },
  59                 { "ibt2",               XFSSTAT_END_IBT_V2              },
  60         };
  61
  62         /* Loop over all stats groups */
  63         for (i=j=len = 0; i < ARRAY_SIZE(xstats); i++) {
  64                 len += sprintf(buffer + len, "%s", xstats[i].desc);
  65                 /* inner loop does each group */
  66                 while (j < xstats[i].endpoint) {
  67                         val = 0;
  68                         /* sum over all cpus */
  69                         for_each_possible_cpu(c)
  70                                 val += *(((__u32*)&per_cpu(xfsstats, c) + j));
  71                         len += sprintf(buffer + len, " %u", val);
  72                         j++;
  73                 }
  74                 buffer[len++] = '\n';
  75         }
  76         /* extra precision counters */
  77         for_each_possible_cpu(i) {
  78                 xs_xstrat_bytes += per_cpu(xfsstats, i).xs_xstrat_bytes;
  79                 xs_write_bytes += per_cpu(xfsstats, i).xs_write_bytes;
  80                 xs_read_bytes += per_cpu(xfsstats, i).xs_read_bytes;
  81         }
  82
  83         len += sprintf(buffer + len, "xpc %Lu %Lu %Lu\n",
  84                         xs_xstrat_bytes, xs_write_bytes, xs_read_bytes);
  85         len += sprintf(buffer + len, "debug %u\n",
  86 #if defined(DEBUG)
  87                 1);
  88 #else
  89                 0);
  90 #endif
  91
  92         if (offset >= len) {
  93                 *start = buffer;
  94                 *eof = 1;
  95                 return 0;
  96         }
  97         *start = buffer + offset;
  98         if ((len -= offset) > count)
  99                 return count;
 100         *eof = 1;
 101
 102         return len;
 103 }
 104
 105 int
 106 xfs_init_procfs(void)
 107 {
 108         if (!proc_mkdir("fs/xfs", NULL))
 109                 goto out;
 110
 111         if (!create_proc_read_entry("fs/xfs/stat", 0, NULL,
 112                         xfs_read_xfsstats, NULL))
 113                 goto out_remove_entry;
 114         return 0;
 115
 116  out_remove_entry:
 117         remove_proc_entry("fs/xfs", NULL);
 118  out:
 119         return -ENOMEM;
 120 }
 121
 122 void
 123 xfs_cleanup_procfs(void)
 124 {
 125         remove_proc_entry("fs/xfs/stat", NULL);
 126         remove_proc_entry("fs/xfs", NULL);
 127 }