2 * collectd - src/memory.c
3 * Copyright (C) 2005-2008 Florian octo Forster
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.
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.
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
19 * Florian octo Forster <octo at verplant.org>
26 #ifdef HAVE_SYS_SYSCTL_H
27 # include <sys/sysctl.h>
30 #ifdef HAVE_MACH_KERN_RETURN_H
31 # include <mach/kern_return.h>
33 #ifdef HAVE_MACH_MACH_INIT_H
34 # include <mach/mach_init.h>
36 #ifdef HAVE_MACH_MACH_HOST_H
37 # include <mach/mach_host.h>
39 #ifdef HAVE_MACH_HOST_PRIV_H
40 # include <mach/host_priv.h>
42 #ifdef HAVE_MACH_VM_STATISTICS_H
43 # include <mach/vm_statistics.h>
47 # include <statgrab.h>
50 /* vm_statistics_data_t */
51 #if HAVE_HOST_STATISTICS
52 static mach_port_t port_host;
53 static vm_size_t pagesize;
54 /* #endif HAVE_HOST_STATISTICS */
58 /* #endif HAVE_SYSCTL */
60 #elif HAVE_SYSCTLBYNAME
61 /* no global variables */
62 /* #endif HAVE_SYSCTLBYNAME */
65 /* no global variables */
66 /* #endif KERNEL_LINUX */
71 /* #endif HAVE_LIBKSTAT */
73 #elif HAVE_LIBSTATGRAB
74 /* no global variables */
75 /* endif HAVE_LIBSTATGRAB */
78 # error "No applicable input method."
81 static int memory_init (void)
83 #if HAVE_HOST_STATISTICS
84 port_host = mach_host_self ();
85 host_page_size (port_host, &pagesize);
86 /* #endif HAVE_HOST_STATISTICS */
89 pagesize = getpagesize ();
90 /* #endif HAVE_SYSCTL */
92 #elif HAVE_SYSCTLBYNAME
94 /* #endif HAVE_SYSCTLBYNAME */
96 #elif defined(KERNEL_LINUX)
98 /* #endif KERNEL_LINUX */
100 #elif defined(HAVE_LIBKSTAT)
101 /* getpagesize(3C) tells me this does not fail.. */
102 pagesize = getpagesize ();
103 if (get_kstat (&ksp, "unix", 0, "system_pages") != 0)
108 #endif /* HAVE_LIBKSTAT */
111 } /* int memory_init */
113 static void memory_submit (const char *type_instance, gauge_t value)
116 value_list_t vl = VALUE_LIST_INIT;
118 values[0].gauge = value;
122 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
123 sstrncpy (vl.plugin, "memory", sizeof (vl.plugin));
124 sstrncpy (vl.type, "memory", sizeof (vl.type));
125 sstrncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
127 plugin_dispatch_values (&vl);
130 static int memory_read (void)
132 #if HAVE_HOST_STATISTICS
133 kern_return_t status;
134 vm_statistics_data_t vm_data;
135 mach_msg_type_number_t vm_data_len;
142 if (!port_host || !pagesize)
145 vm_data_len = sizeof (vm_data) / sizeof (natural_t);
146 if ((status = host_statistics (port_host, HOST_VM_INFO,
147 (host_info_t) &vm_data,
148 &vm_data_len)) != KERN_SUCCESS)
150 ERROR ("memory-plugin: host_statistics failed and returned the value %i", (int) status);
155 * From <http://docs.info.apple.com/article.html?artnum=107918>:
158 * This information can't be cached to disk, so it must stay in RAM.
159 * The amount depends on what applications you are using.
162 * This information is currently in RAM and actively being used.
165 * This information is no longer being used and has been cached to
166 * disk, but it will remain in RAM until another application needs
167 * the space. Leaving this information in RAM is to your advantage if
168 * you (or a client of your computer) come back to it later.
171 * This memory is not being used.
174 wired = vm_data.wire_count * pagesize;
175 active = vm_data.active_count * pagesize;
176 inactive = vm_data.inactive_count * pagesize;
177 free = vm_data.free_count * pagesize;
179 memory_submit ("wired", wired);
180 memory_submit ("active", active);
181 memory_submit ("inactive", inactive);
182 memory_submit ("free", free);
183 /* #endif HAVE_HOST_STATISTICS */
186 int mib[] = {CTL_VM, VM_METER};
187 struct vmtotal vmtotal;
192 ERROR ("memory plugin: Invalid pagesize: %i", pagesize);
196 memset (&vmtotal, 0, sizeof (vmtotal));
197 size = sizeof (vmtotal);
199 if (sysctl (mib, 2, &vmtotal, &size, NULL, 0) < 0) {
201 WARNING ("memory plugin: sysctl failed: %s",
202 sstrerror (errno, errbuf, sizeof (errbuf)));
206 memory_submit ("active", vmtotal.t_arm * pagesize);
207 memory_submit ("inactive", (vmtotal.t_rm - vmtotal.t_arm) * pagesize);
208 memory_submit ("free", vmtotal.t_free * pagesize);
209 /* #endif HAVE_SYSCTL */
211 #elif HAVE_SYSCTLBYNAME
213 * vm.stats.vm.v_page_size: 4096
214 * vm.stats.vm.v_page_count: 246178
215 * vm.stats.vm.v_free_count: 28760
216 * vm.stats.vm.v_wire_count: 37526
217 * vm.stats.vm.v_active_count: 55239
218 * vm.stats.vm.v_inactive_count: 113730
219 * vm.stats.vm.v_cache_count: 10809
221 char *sysctl_keys[8] =
223 "vm.stats.vm.v_page_size",
224 "vm.stats.vm.v_page_count",
225 "vm.stats.vm.v_free_count",
226 "vm.stats.vm.v_wire_count",
227 "vm.stats.vm.v_active_count",
228 "vm.stats.vm.v_inactive_count",
229 "vm.stats.vm.v_cache_count",
232 double sysctl_vals[8];
236 for (i = 0; sysctl_keys[i] != NULL; i++)
239 size_t value_len = sizeof (value);
241 if (sysctlbyname (sysctl_keys[i], (void *) &value, &value_len,
244 sysctl_vals[i] = value;
245 DEBUG ("memory plugin: %26s: %6i", sysctl_keys[i], sysctl_vals[i]);
249 sysctl_vals[i] = NAN;
251 } /* for (sysctl_keys) */
253 /* multiply all all page counts with the pagesize */
254 for (i = 1; sysctl_keys[i] != NULL; i++)
255 if (!isnan (sysctl_vals[i]))
256 sysctl_vals[i] *= sysctl_vals[0];
258 memory_submit ("free", sysctl_vals[2]);
259 memory_submit ("wired", sysctl_vals[3]);
260 memory_submit ("active", sysctl_vals[4]);
261 memory_submit ("inactive", sysctl_vals[5]);
262 memory_submit ("cache", sysctl_vals[6]);
263 /* #endif HAVE_SYSCTLBYNAME */
272 long long mem_used = 0;
273 long long mem_buffered = 0;
274 long long mem_cached = 0;
275 long long mem_free = 0;
277 if ((fh = fopen ("/proc/meminfo", "r")) == NULL)
280 WARNING ("memory: fopen: %s",
281 sstrerror (errno, errbuf, sizeof (errbuf)));
285 while (fgets (buffer, 1024, fh) != NULL)
287 long long *val = NULL;
289 if (strncasecmp (buffer, "MemTotal:", 9) == 0)
291 else if (strncasecmp (buffer, "MemFree:", 8) == 0)
293 else if (strncasecmp (buffer, "Buffers:", 8) == 0)
295 else if (strncasecmp (buffer, "Cached:", 7) == 0)
300 numfields = strsplit (buffer, fields, 8);
305 *val = atoll (fields[1]) * 1024LL;
311 WARNING ("memory: fclose: %s",
312 sstrerror (errno, errbuf, sizeof (errbuf)));
315 if (mem_used >= (mem_free + mem_buffered + mem_cached))
317 mem_used -= mem_free + mem_buffered + mem_cached;
318 memory_submit ("used", mem_used);
319 memory_submit ("buffered", mem_buffered);
320 memory_submit ("cached", mem_cached);
321 memory_submit ("free", mem_free);
323 /* #endif KERNEL_LINUX */
333 mem_used = get_kstat_value (ksp, "pagestotal");
334 mem_free = get_kstat_value (ksp, "pagesfree");
335 mem_lock = get_kstat_value (ksp, "pageslocked");
337 if ((mem_used < 0LL) || (mem_free < 0LL) || (mem_lock < 0LL))
339 if (mem_used < (mem_free + mem_lock))
342 mem_used -= mem_free + mem_lock;
343 mem_used *= pagesize; /* If this overflows you have some serious */
344 mem_free *= pagesize; /* memory.. Why not call me up and give me */
345 mem_lock *= pagesize; /* some? ;) */
347 memory_submit ("used", mem_used);
348 memory_submit ("free", mem_free);
349 memory_submit ("locked", mem_lock);
350 /* #endif HAVE_LIBKSTAT */
352 #elif HAVE_LIBSTATGRAB
355 if ((ios = sg_get_mem_stats ()) != NULL)
357 memory_submit ("used", ios->used);
358 memory_submit ("cached", ios->cache);
359 memory_submit ("free", ios->free);
361 #endif /* HAVE_LIBSTATGRAB */
366 void module_register (void)
368 plugin_register_init ("memory", memory_init);
369 plugin_register_read ("memory", memory_read);
370 } /* void module_register */