1 /**
2 * collectd - src/swap.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 #if HAVE_SYS_SWAP_H
27 # include <sys/swap.h>
28 #endif
29 #if HAVE_SYS_PARAM_H
30 # include <sys/param.h>
31 #endif
32 #if HAVE_SYS_SYSCTL_H
33 # include <sys/sysctl.h>
34 #endif
35 #if HAVE_KVM_H
36 # include <kvm.h>
37 #endif
39 #undef MAX
40 #define MAX(x,y) ((x) > (y) ? (x) : (y))
42 #if KERNEL_LINUX
43 /* No global variables */
44 /* #endif KERNEL_LINUX */
46 #elif HAVE_LIBKSTAT
47 static unsigned long long pagesize;
48 static kstat_t *ksp;
49 /* #endif HAVE_LIBKSTAT */
51 #elif defined(VM_SWAPUSAGE)
52 /* No global variables */
53 /* #endif defined(VM_SWAPUSAGE) */
55 #elif HAVE_LIBKVM
56 static kvm_t *kvm_obj = NULL;
57 int kvm_pagesize;
58 /* #endif HAVE_LIBKVM */
60 #elif HAVE_LIBSTATGRAB
61 /* No global variables */
62 /* #endif HAVE_LIBSTATGRAB */
64 #else
65 # error "No applicable input method."
66 #endif /* HAVE_LIBSTATGRAB */
68 static int swap_init (void)
69 {
70 #if KERNEL_LINUX
71 /* No init stuff */
72 /* #endif KERNEL_LINUX */
74 #elif HAVE_LIBKSTAT
75 /* getpagesize(3C) tells me this does not fail.. */
76 pagesize = (unsigned long long) getpagesize ();
77 if (get_kstat (&ksp, "unix", 0, "system_pages"))
78 ksp = NULL;
79 /* #endif HAVE_LIBKSTAT */
81 #elif defined(VM_SWAPUSAGE)
82 /* No init stuff */
83 /* #endif defined(VM_SWAPUSAGE) */
85 #elif HAVE_LIBKVM
86 if (kvm_obj != NULL)
87 {
88 kvm_close (kvm_obj);
89 kvm_obj = NULL;
90 }
92 kvm_pagesize = getpagesize ();
94 if ((kvm_obj = kvm_open (NULL, /* execfile */
95 NULL, /* corefile */
96 NULL, /* swapfile */
97 O_RDONLY, /* flags */
98 NULL)) /* errstr */
99 == NULL)
100 {
101 ERROR ("swap plugin: kvm_open failed.");
102 return (-1);
103 }
104 /* #endif HAVE_LIBKVM */
106 #elif HAVE_LIBSTATGRAB
107 /* No init stuff */
108 #endif /* HAVE_LIBSTATGRAB */
110 return (0);
111 }
113 static void swap_submit (const char *type_instance, double value)
114 {
115 value_t values[1];
116 value_list_t vl = VALUE_LIST_INIT;
118 values[0].gauge = value;
120 vl.values = values;
121 vl.values_len = 1;
122 vl.time = time (NULL);
123 strcpy (vl.host, hostname_g);
124 strcpy (vl.plugin, "swap");
125 strncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
127 plugin_dispatch_values ("swap", &vl);
128 } /* void swap_submit */
130 static int swap_read (void)
131 {
132 #if KERNEL_LINUX
133 FILE *fh;
134 char buffer[1024];
136 char *fields[8];
137 int numfields;
139 unsigned long long swap_used = 0LL;
140 unsigned long long swap_cached = 0LL;
141 unsigned long long swap_free = 0LL;
142 unsigned long long swap_total = 0LL;
144 if ((fh = fopen ("/proc/meminfo", "r")) == NULL)
145 {
146 char errbuf[1024];
147 WARNING ("memory: fopen: %s",
148 sstrerror (errno, errbuf, sizeof (errbuf)));
149 return (-1);
150 }
152 while (fgets (buffer, 1024, fh) != NULL)
153 {
154 unsigned long long *val = NULL;
156 if (strncasecmp (buffer, "SwapTotal:", 10) == 0)
157 val = &swap_total;
158 else if (strncasecmp (buffer, "SwapFree:", 9) == 0)
159 val = &swap_free;
160 else if (strncasecmp (buffer, "SwapCached:", 11) == 0)
161 val = &swap_cached;
162 else
163 continue;
165 numfields = strsplit (buffer, fields, 8);
167 if (numfields < 2)
168 continue;
170 *val = atoll (fields[1]) * 1024LL;
171 }
173 if (fclose (fh))
174 {
175 char errbuf[1024];
176 WARNING ("memory: fclose: %s",
177 sstrerror (errno, errbuf, sizeof (errbuf)));
178 }
180 if ((swap_total == 0LL) || ((swap_free + swap_cached) > swap_total))
181 return (-1);
183 swap_used = swap_total - (swap_free + swap_cached);
185 swap_submit ("used", swap_used);
186 swap_submit ("free", swap_free);
187 swap_submit ("cached", swap_cached);
188 /* #endif KERNEL_LINUX */
190 #elif HAVE_LIBKSTAT
191 unsigned long long swap_alloc;
192 unsigned long long swap_resv;
193 unsigned long long swap_avail;
195 struct anoninfo ai;
197 if (swapctl (SC_AINFO, &ai) == -1)
198 {
199 char errbuf[1024];
200 ERROR ("swap plugin: swapctl failed: %s",
201 sstrerror (errno, errbuf, sizeof (errbuf)));
202 return (-1);
203 }
205 /*
206 * Calculations from:
207 * http://cvs.opensolaris.org/source/xref/on/usr/src/cmd/swap/swap.c
208 * Also see:
209 * http://www.itworld.com/Comp/2377/UIR980701perf/ (outdated?)
210 * /usr/include/vm/anon.h
211 *
212 * In short, swap -s shows: allocated + reserved = used, available
213 *
214 * However, Solaris does not allow to allocated/reserved more than the
215 * available swap (physical memory + disk swap), so the pedant may
216 * prefer: allocated + unallocated = reserved, available
217 *
218 * We map the above to: used + resv = n/a, free
219 *
220 * Does your brain hurt yet? - Christophe Kalt
221 *
222 * Oh, and in case you wonder,
223 * swap_alloc = pagesize * ( ai.ani_max - ai.ani_free );
224 * can suffer from a 32bit overflow.
225 */
226 swap_alloc = ai.ani_max - ai.ani_free;
227 swap_alloc *= pagesize;
228 swap_resv = ai.ani_resv + ai.ani_free - ai.ani_max;
229 swap_resv *= pagesize;
230 swap_avail = ai.ani_max - ai.ani_resv;
231 swap_avail *= pagesize;
233 swap_submit ("used", swap_alloc);
234 swap_submit ("free", swap_avail);
235 swap_submit ("reserved", swap_resv - swap_alloc);
236 /* #endif HAVE_LIBKSTAT */
238 #elif defined(VM_SWAPUSAGE)
239 int mib[3];
240 size_t mib_len;
241 struct xsw_usage sw_usage;
242 size_t sw_usage_len;
244 mib_len = 2;
245 mib[0] = CTL_VM;
246 mib[1] = VM_SWAPUSAGE;
248 sw_usage_len = sizeof (struct xsw_usage);
250 if (sysctl (mib, mib_len, &sw_usage, &sw_usage_len, NULL, 0) != 0)
251 return (-1);
253 /* The returned values are bytes. */
254 swap_submit ("used", sw_usage.xsu_used);
255 swap_submit ("free", sw_usage.xsu_avail);
256 /* #endif VM_SWAPUSAGE */
258 #elif HAVE_LIBKVM
259 struct kvm_swap data_s;
260 int status;
262 unsigned long long used;
263 unsigned long long free;
264 unsigned long long total;
266 if (kvm_obj == NULL)
267 return (-1);
269 /* only one structure => only get the grand total, no details */
270 status = kvm_getswapinfo (kvm_obj, &data_s, 1, 0);
271 if (status == -1)
272 return (-1);
274 total = (unsigned long long) data_s.ksw_total;
275 used = (unsigned long long) data_s.ksw_used;
277 total *= (unsigned long long) kvm_pagesize;
278 used *= (unsigned long long) kvm_pagesize;
280 free = total - used;
282 swap_submit ("used", used);
283 swap_submit ("free", free);
284 /* #endif HAVE_LIBKVM */
286 #elif HAVE_LIBSTATGRAB
287 sg_swap_stats *swap;
289 swap = sg_get_swap_stats ();
291 if (swap == NULL)
292 return (-1);
294 swap_submit ("used", swap->used);
295 swap_submit ("free", swap->free);
296 #endif /* HAVE_LIBSTATGRAB */
298 return (0);
299 } /* int swap_read */
301 void module_register (void)
302 {
303 plugin_register_init ("swap", swap_init);
304 plugin_register_read ("swap", swap_read);
305 } /* void module_register */