GNUnet  0.11.x
gnunet-service-testbed_meminfo.c
Go to the documentation of this file.
1 /*
2  This file is part of GNUnet.
3  Copyright (C) 2008--2013 GNUnet e.V.
4 
5  GNUnet is free software: you can redistribute it and/or modify it
6  under the terms of the GNU Affero General Public License as published
7  by the Free Software Foundation, either version 3 of the License,
8  or (at your option) any later version.
9 
10  GNUnet 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  Affero General Public License for more details.
14 
15  You should have received a copy of the GNU Affero General Public License
16  along with this program. If not, see <http://www.gnu.org/licenses/>.
17 
18  SPDX-License-Identifier: AGPL3.0-or-later
19  */
20 
21 #include "platform.h"
22 #include "gnunet_util_lib.h"
23 
24 /*
25  * File for parsing top-level /proc entities.
26  * Copyright Copyright (C) 1992-1998 by Michael K. Johnson, johnsonm@redhat.com
27  * Copyright 1998-2003 Albert Cahalan
28  * June 2003, Fabian Frederick, disk and slab info
29  *
30  * This library is free software; you can redistribute it and/or
31  * modify it under the terms of the GNU Lesser General Public
32  * License as published by the Free Software Foundation; either
33  * version 2.1 of the License, or (at your option) any later version.
34  *
35  * This library is distributed in the hope that it will be useful,
36  * but WITHOUT ANY WARRANTY; without even the implied warranty of
37  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
38  * Lesser General Public License for more details.
39  *
40  * You should have received a copy of the GNU Lesser General Public
41  * License along with this library; if not, write to the Free Software
42  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
43  */
44 
45 #define BAD_OPEN_MESSAGE \
46  "Error: /proc must be mounted\n" \
47  " To mount /proc at boot you need an /etc/fstab line like:\n" \
48  " proc /proc proc defaults\n" \
49  " In the meantime, run \"mount proc /proc -t proc\"\n"
50 
51 #define STAT_FILE "/proc/stat"
52 // static int stat_fd = -1;
53 #define UPTIME_FILE "/proc/uptime"
54 // static int uptime_fd = -1;
55 #define LOADAVG_FILE "/proc/loadavg"
56 // static int loadavg_fd = -1;
57 #define MEMINFO_FILE "/proc/meminfo"
58 static int meminfo_fd = -1;
59 #define VMINFO_FILE "/proc/vmstat"
60 // static int vminfo_fd = -1;
61 
62 // As of 2.6.24 /proc/meminfo seems to need 888 on 64-bit,
63 // and would need 1258 if the obsolete fields were there.
64 static char buf[2048];
65 
66 /* This macro opens filename only if necessary and seeks to 0 so
67  * that successive calls to the functions are more efficient.
68  * It also reads the current contents of the file into the global buf.
69  */
70 #define FILE_TO_BUF(filename, fd) do { \
71  static int local_n; \
72  if (fd == -1 && (fd = open (filename, O_RDONLY)) == -1) { \
73  fputs (BAD_OPEN_MESSAGE, stderr); \
74  fflush (NULL); \
75  _exit (102); \
76  } \
77  lseek (fd, 0L, SEEK_SET); \
78  if ((local_n = read (fd, buf, sizeof buf - 1)) < 0) { \
79  perror (filename); \
80  fflush (NULL); \
81  _exit (103); \
82  } \
83  buf[local_n] = '\0'; \
84 } while (0)
85 
86 
87 /***********************************************************************/
88 /*
89  * Copyright 1999 by Albert Cahalan; all rights reserved.
90  * This file may be used subject to the terms and conditions of the
91  * GNU Library General Public License Version 2, or any later version
92  * at your option, as published by the Free Software Foundation.
93  * This program is distributed in the hope that it will be useful,
94  * but WITHOUT ANY WARRANTY; without even the implied warranty of
95  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
96  * GNU Library General Public License for more details.
97  */
98 
99 typedef struct mem_table_struct
100 {
101  const char *name; /* memory type name */
102  unsigned long *slot; /* slot in return struct */
104 
105 static int
106 compare_mem_table_structs (const void *a, const void *b)
107 {
108  return strcmp (((const mem_table_struct*) a)->name, ((const
109  mem_table_struct*) b)->
110  name);
111 }
112 
113 
114 /* example data, following junk, with comments added:
115  *
116  * MemTotal: 61768 kB old
117  * MemFree: 1436 kB old
118  * MemShared: 0 kB old (now always zero; not calculated)
119  * Buffers: 1312 kB old
120  * Cached: 20932 kB old
121  * Active: 12464 kB new
122  * Inact_dirty: 7772 kB new
123  * Inact_clean: 2008 kB new
124  * Inact_target: 0 kB new
125  * Inact_laundry: 0 kB new, and might be missing too
126  * HighTotal: 0 kB
127  * HighFree: 0 kB
128  * LowTotal: 61768 kB
129  * LowFree: 1436 kB
130  * SwapTotal: 122580 kB old
131  * SwapFree: 60352 kB old
132  * Inactive: 20420 kB 2.5.41+
133  * Dirty: 0 kB 2.5.41+
134  * Writeback: 0 kB 2.5.41+
135  * Mapped: 9792 kB 2.5.41+
136  * Slab: 4564 kB 2.5.41+
137  * Committed_AS: 8440 kB 2.5.41+
138  * PageTables: 304 kB 2.5.41+
139  * ReverseMaps: 5738 2.5.41+
140  * SwapCached: 0 kB 2.5.??+
141  * HugePages_Total: 220 2.5.??+
142  * HugePages_Free: 138 2.5.??+
143  * Hugepagesize: 4096 kB 2.5.??+
144  */
145 
146 /* obsolete */
147 unsigned long kb_main_shared;
148 /* old but still kicking -- the important stuff */
149 unsigned long kb_main_buffers;
150 unsigned long kb_main_cached;
151 unsigned long kb_main_free;
152 unsigned long kb_main_total;
153 unsigned long kb_swap_free;
154 unsigned long kb_swap_total;
155 /* recently introduced */
156 unsigned long kb_high_free;
157 unsigned long kb_high_total;
158 unsigned long kb_low_free;
159 unsigned long kb_low_total;
160 /* 2.4.xx era */
161 unsigned long kb_active;
162 unsigned long kb_inact_laundry;
163 unsigned long kb_inact_dirty;
164 unsigned long kb_inact_clean;
165 unsigned long kb_inact_target;
166 unsigned long kb_swap_cached; /* late 2.4 and 2.6+ only */
167 /* derived values */
168 unsigned long kb_swap_used;
169 unsigned long kb_main_used;
170 /* 2.5.41+ */
171 unsigned long kb_writeback;
172 unsigned long kb_slab;
173 unsigned long nr_reversemaps;
174 unsigned long kb_committed_as;
175 unsigned long kb_dirty;
176 unsigned long kb_inactive;
177 unsigned long kb_mapped;
178 unsigned long kb_pagetables;
179 // seen on a 2.6.x kernel:
180 static unsigned long kb_vmalloc_chunk;
181 static unsigned long kb_vmalloc_total;
182 static unsigned long kb_vmalloc_used;
183 // seen on 2.6.24-rc6-git12
184 static unsigned long kb_anon_pages;
185 static unsigned long kb_bounce;
186 static unsigned long kb_commit_limit;
187 static unsigned long kb_nfs_unstable;
188 static unsigned long kb_swap_reclaimable;
189 static unsigned long kb_swap_unreclaimable;
190 
191 void
192 meminfo (void)
193 {
194  char namebuf[16]; /* big enough to hold any row name */
195  mem_table_struct findme = { namebuf, NULL };
196  mem_table_struct *found;
197  char *head;
198  char *tail;
199  static const mem_table_struct mem_table[] = {
200  { "Active", &kb_active }, // important
201  { "AnonPages", &kb_anon_pages },
202  { "Bounce", &kb_bounce },
203  { "Buffers", &kb_main_buffers }, // important
204  { "Cached", &kb_main_cached }, // important
205  { "CommitLimit", &kb_commit_limit },
206  { "Committed_AS", &kb_committed_as },
207  { "Dirty", &kb_dirty }, // kB version of vmstat nr_dirty
208  { "HighFree", &kb_high_free },
209  { "HighTotal", &kb_high_total },
210  { "Inact_clean", &kb_inact_clean },
211  { "Inact_dirty", &kb_inact_dirty },
212  { "Inact_laundry", &kb_inact_laundry },
213  { "Inact_target", &kb_inact_target },
214  { "Inactive", &kb_inactive }, // important
215  { "LowFree", &kb_low_free },
216  { "LowTotal", &kb_low_total },
217  { "Mapped", &kb_mapped }, // kB version of vmstat nr_mapped
218  { "MemFree", &kb_main_free }, // important
219  { "MemShared", &kb_main_shared }, // important, but now gone!
220  { "MemTotal", &kb_main_total }, // important
221  { "NFS_Unstable", &kb_nfs_unstable },
222  { "PageTables", &kb_pagetables }, // kB version of vmstat nr_page_table_pages
223  { "ReverseMaps", &nr_reversemaps }, // same as vmstat nr_page_table_pages
224  { "SReclaimable", &kb_swap_reclaimable }, // "swap reclaimable" (dentry and inode structures)
225  { "SUnreclaim", &kb_swap_unreclaimable },
226  { "Slab", &kb_slab }, // kB version of vmstat nr_slab
227  { "SwapCached", &kb_swap_cached },
228  { "SwapFree", &kb_swap_free }, // important
229  { "SwapTotal", &kb_swap_total }, // important
230  { "VmallocChunk", &kb_vmalloc_chunk },
231  { "VmallocTotal", &kb_vmalloc_total },
232  { "VmallocUsed", &kb_vmalloc_used },
233  { "Writeback", &kb_writeback }, // kB version of vmstat nr_writeback
234  };
235  const int mem_table_count = sizeof(mem_table) / sizeof(mem_table_struct);
236 
238 
239  kb_inactive = ~0UL;
240 
241  head = buf;
242  for (;;)
243  {
244  tail = strchr (head, ':');
245  if (! tail)
246  break;
247  *tail = '\0';
248  if (strlen (head) >= sizeof(namebuf))
249  {
250  head = tail + 1;
251  goto nextline;
252  }
253  strcpy (namebuf, head);
254  found = bsearch (&findme, mem_table, mem_table_count,
256  );
257  head = tail + 1;
258  if (! found)
259  goto nextline;
260  *(found->slot) = (unsigned long) strtoull (head, &tail, 10);
261 nextline:
262  tail = strchr (head, '\n');
263  if (! tail)
264  break;
265  head = tail + 1;
266  }
267  if (! kb_low_total) /* low==main except with large-memory support */
268  {
271  }
272  if (kb_inactive == ~0UL)
273  {
275  }
278 }
unsigned long kb_swap_used
#define FILE_TO_BUF(filename, fd)
static unsigned long kb_vmalloc_chunk
unsigned long kb_low_total
unsigned long kb_inact_laundry
unsigned long kb_main_used
unsigned long kb_swap_cached
static unsigned long kb_anon_pages
static unsigned long kb_vmalloc_used
unsigned long kb_main_cached
unsigned long kb_main_free
unsigned long kb_mapped
unsigned long kb_main_shared
static int meminfo_fd
static int compare_mem_table_structs(const void *a, const void *b)
static unsigned long kb_swap_reclaimable
unsigned long kb_main_total
static unsigned long kb_commit_limit
static unsigned long kb_swap_unreclaimable
static char buf[2048]
unsigned long kb_high_total
void meminfo(void)
static unsigned long kb_vmalloc_total
#define MEMINFO_FILE
unsigned long kb_writeback
struct mem_table_struct mem_table_struct
unsigned long kb_inact_target
static unsigned long kb_bounce
unsigned long kb_inactive
unsigned long kb_low_free
unsigned long nr_reversemaps
static unsigned long kb_nfs_unstable
unsigned long kb_pagetables
static struct PendingResolutions * head
Head of list of pending resolution requests.
Definition: gnunet-ats.c:230
unsigned long kb_inact_dirty
unsigned long kb_inact_clean
unsigned long kb_slab
static struct PendingResolutions * tail
Tail of list of pending resolution requests.
Definition: gnunet-ats.c:235
unsigned long kb_main_buffers
unsigned long kb_swap_free
unsigned long kb_active
unsigned long kb_dirty
unsigned long kb_committed_as
unsigned long kb_swap_total
unsigned long kb_high_free