1 /**
2 * collectd - src/memory.c
3 * Copyright (C) 2005-2007 Florian octo Forster
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; only version 2 of the License is applicable.
8 *
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License along
15 * with this program; if not, write to the Free Software Foundation, Inc.,
16 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * Authors:
19 * Florian octo Forster <octo at verplant.org>
20 **/
22 #include "collectd.h"
23 #include "common.h"
24 #include "plugin.h"
26 #ifdef HAVE_SYS_SYSCTL_H
27 # include <sys/sysctl.h>
28 #endif
30 #ifdef HAVE_MACH_KERN_RETURN_H
31 # include <mach/kern_return.h>
32 #endif
33 #ifdef HAVE_MACH_MACH_INIT_H
34 # include <mach/mach_init.h>
35 #endif
36 #ifdef HAVE_MACH_MACH_HOST_H
37 # include <mach/mach_host.h>
38 #endif
39 #ifdef HAVE_MACH_HOST_PRIV_H
40 # include <mach/host_priv.h>
41 #endif
42 #ifdef HAVE_MACH_VM_STATISTICS_H
43 # include <mach/vm_statistics.h>
44 #endif
46 /* vm_statistics_data_t */
47 #if HAVE_HOST_STATISTICS
48 static mach_port_t port_host;
49 static vm_size_t pagesize;
50 /* #endif HAVE_HOST_STATISTICS */
52 #elif HAVE_SYSCTLBYNAME
53 /* no global variables */
54 /* #endif HAVE_SYSCTLBYNAME */
56 #elif KERNEL_LINUX
57 /* no global variables */
58 /* #endif KERNEL_LINUX */
60 #elif HAVE_LIBKSTAT
61 static int pagesize;
62 static kstat_t *ksp;
63 /* #endif HAVE_LIBKSTAT */
65 #else
66 # error "No applicable input method."
67 #endif
69 static int memory_init (void)
70 {
71 #if HAVE_HOST_STATISTICS
72 port_host = mach_host_self ();
73 host_page_size (port_host, &pagesize);
74 /* #endif HAVE_HOST_STATISTICS */
76 #elif HAVE_SYSCTLBYNAME
77 /* no init stuff */
78 /* #endif HAVE_SYSCTLBYNAME */
80 #elif defined(KERNEL_LINUX)
81 /* no init stuff */
82 /* #endif KERNEL_LINUX */
84 #elif defined(HAVE_LIBKSTAT)
85 /* getpagesize(3C) tells me this does not fail.. */
86 pagesize = getpagesize ();
87 if (get_kstat (&ksp, "unix", 0, "system_pages"))
88 ksp = NULL;
89 #endif /* HAVE_LIBKSTAT */
91 return (0);
92 } /* int memory_init */
94 static void memory_submit (const char *type_instance, gauge_t value)
95 {
96 value_t values[1];
97 value_list_t vl = VALUE_LIST_INIT;
99 values[0].gauge = value;
101 vl.values = values;
102 vl.values_len = 1;
103 vl.time = time (NULL);
104 strcpy (vl.host, hostname_g);
105 strcpy (vl.plugin, "memory");
106 strcpy (vl.type, "memory");
107 strncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
108 vl.type_instance[sizeof (vl.type_instance) - 1] = '\0';
110 plugin_dispatch_values (&vl);
111 }
113 static int memory_read (void)
114 {
115 #if HAVE_HOST_STATISTICS
116 kern_return_t status;
117 vm_statistics_data_t vm_data;
118 mach_msg_type_number_t vm_data_len;
120 long long wired;
121 long long active;
122 long long inactive;
123 long long free;
125 if (!port_host || !pagesize)
126 return (-1);
128 vm_data_len = sizeof (vm_data) / sizeof (natural_t);
129 if ((status = host_statistics (port_host, HOST_VM_INFO,
130 (host_info_t) &vm_data,
131 &vm_data_len)) != KERN_SUCCESS)
132 {
133 ERROR ("memory-plugin: host_statistics failed and returned the value %i", (int) status);
134 return (-1);
135 }
137 /*
138 * From <http://docs.info.apple.com/article.html?artnum=107918>:
139 *
140 * Wired memory
141 * This information can't be cached to disk, so it must stay in RAM.
142 * The amount depends on what applications you are using.
143 *
144 * Active memory
145 * This information is currently in RAM and actively being used.
146 *
147 * Inactive memory
148 * This information is no longer being used and has been cached to
149 * disk, but it will remain in RAM until another application needs
150 * the space. Leaving this information in RAM is to your advantage if
151 * you (or a client of your computer) come back to it later.
152 *
153 * Free memory
154 * This memory is not being used.
155 */
157 wired = vm_data.wire_count * pagesize;
158 active = vm_data.active_count * pagesize;
159 inactive = vm_data.inactive_count * pagesize;
160 free = vm_data.free_count * pagesize;
162 memory_submit ("wired", wired);
163 memory_submit ("active", active);
164 memory_submit ("inactive", inactive);
165 memory_submit ("free", free);
166 /* #endif HAVE_HOST_STATISTICS */
168 #elif HAVE_SYSCTLBYNAME
169 /*
170 * vm.stats.vm.v_page_size: 4096
171 * vm.stats.vm.v_page_count: 246178
172 * vm.stats.vm.v_free_count: 28760
173 * vm.stats.vm.v_wire_count: 37526
174 * vm.stats.vm.v_active_count: 55239
175 * vm.stats.vm.v_inactive_count: 113730
176 * vm.stats.vm.v_cache_count: 10809
177 */
178 char *sysctl_keys[8] =
179 {
180 "vm.stats.vm.v_page_size",
181 "vm.stats.vm.v_page_count",
182 "vm.stats.vm.v_free_count",
183 "vm.stats.vm.v_wire_count",
184 "vm.stats.vm.v_active_count",
185 "vm.stats.vm.v_inactive_count",
186 "vm.stats.vm.v_cache_count",
187 NULL
188 };
189 double sysctl_vals[8];
191 int i;
193 for (i = 0; sysctl_keys[i] != NULL; i++)
194 {
195 int value;
196 size_t value_len = sizeof (value);
198 if (sysctlbyname (sysctl_keys[i], (void *) &value, &value_len,
199 NULL, 0) == 0)
200 {
201 sysctl_vals[i] = value;
202 DEBUG ("memory plugin: %26s: %6i", sysctl_keys[i], sysctl_vals[i]);
203 }
204 else
205 {
206 sysctl_vals[i] = NAN;
207 }
208 } /* for (sysctl_keys) */
210 /* multiply all all page counts with the pagesize */
211 for (i = 1; sysctl_keys[i] != NULL; i++)
212 if (!isnan (sysctl_vals[i]))
213 sysctl_vals[i] *= sysctl_vals[0];
215 memory_submit ("free", sysctl_vals[2]);
216 memory_submit ("wired", sysctl_vals[3]);
217 memory_submit ("active", sysctl_vals[4]);
218 memory_submit ("inactive", sysctl_vals[5]);
219 memory_submit ("cache", sysctl_vals[6]);
220 /* #endif HAVE_SYSCTLBYNAME */
222 #elif defined(KERNEL_LINUX)
223 FILE *fh;
224 char buffer[1024];
226 char *fields[8];
227 int numfields;
229 long long mem_used = 0;
230 long long mem_buffered = 0;
231 long long mem_cached = 0;
232 long long mem_free = 0;
234 if ((fh = fopen ("/proc/meminfo", "r")) == NULL)
235 {
236 char errbuf[1024];
237 WARNING ("memory: fopen: %s",
238 sstrerror (errno, errbuf, sizeof (errbuf)));
239 return (-1);
240 }
242 while (fgets (buffer, 1024, fh) != NULL)
243 {
244 long long *val = NULL;
246 if (strncasecmp (buffer, "MemTotal:", 9) == 0)
247 val = &mem_used;
248 else if (strncasecmp (buffer, "MemFree:", 8) == 0)
249 val = &mem_free;
250 else if (strncasecmp (buffer, "Buffers:", 8) == 0)
251 val = &mem_buffered;
252 else if (strncasecmp (buffer, "Cached:", 7) == 0)
253 val = &mem_cached;
254 else
255 continue;
257 numfields = strsplit (buffer, fields, 8);
259 if (numfields < 2)
260 continue;
262 *val = atoll (fields[1]) * 1024LL;
263 }
265 if (fclose (fh))
266 {
267 char errbuf[1024];
268 WARNING ("memory: fclose: %s",
269 sstrerror (errno, errbuf, sizeof (errbuf)));
270 }
272 if (mem_used >= (mem_free + mem_buffered + mem_cached))
273 {
274 mem_used -= mem_free + mem_buffered + mem_cached;
275 memory_submit ("used", mem_used);
276 memory_submit ("buffered", mem_buffered);
277 memory_submit ("cached", mem_cached);
278 memory_submit ("free", mem_free);
279 }
280 /* #endif defined(KERNEL_LINUX) */
282 #elif defined(HAVE_LIBKSTAT)
283 long long mem_used;
284 long long mem_free;
285 long long mem_lock;
287 if (ksp == NULL)
288 return (-1);
290 mem_used = get_kstat_value (ksp, "pagestotal");
291 mem_free = get_kstat_value (ksp, "pagesfree");
292 mem_lock = get_kstat_value (ksp, "pageslocked");
294 if ((mem_used < 0LL) || (mem_free < 0LL) || (mem_lock < 0LL))
295 return (-1);
296 if (mem_used < (mem_free + mem_lock))
297 return (-1);
299 mem_used -= mem_free + mem_lock;
300 mem_used *= pagesize; /* If this overflows you have some serious */
301 mem_free *= pagesize; /* memory.. Why not call me up and give me */
302 mem_lock *= pagesize; /* some? ;) */
304 memory_submit ("used", mem_used);
305 memory_submit ("free", mem_free);
306 memory_submit ("locked", mem_lock);
307 /* #endif defined(HAVE_LIBKSTAT) */
309 #elif defined(HAVE_LIBSTATGRAB)
310 sg_mem_stats *ios;
312 if ((ios = sg_get_mem_stats ()) != NULL)
313 {
314 memory_submit ("used", ios->used);
315 memory_submit ("cached", ios->cached);
316 memory_submit ("free", ios->free);
317 }
318 #endif /* HAVE_LIBSTATGRAB */
320 return (0);
321 }
323 void module_register (void)
324 {
325 plugin_register_init ("memory", memory_init);
326 plugin_register_read ("memory", memory_read);
327 } /* void module_register */