11c9c57f898ca58877c2d907a8597e19d01727a8
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_VM_ANON_H
30 # include <vm/anon.h>
31 #endif
32 #if HAVE_SYS_PARAM_H
33 # include <sys/param.h>
34 #endif
35 #if HAVE_SYS_SYSCTL_H
36 # include <sys/sysctl.h>
37 #endif
38 #if HAVE_KVM_H
39 # include <kvm.h>
40 #endif
42 #if HAVE_STATGRAB_H
43 # include <statgrab.h>
44 #endif
46 #undef MAX
47 #define MAX(x,y) ((x) > (y) ? (x) : (y))
49 #if KERNEL_LINUX
50 /* No global variables */
51 /* #endif KERNEL_LINUX */
53 #elif HAVE_LIBKSTAT
54 static unsigned long long pagesize;
55 static kstat_t *ksp;
56 /* #endif HAVE_LIBKSTAT */
58 #elif defined(VM_SWAPUSAGE)
59 /* No global variables */
60 /* #endif defined(VM_SWAPUSAGE) */
62 #elif HAVE_LIBKVM_GETSWAPINFO
63 static kvm_t *kvm_obj = NULL;
64 int kvm_pagesize;
65 /* #endif HAVE_LIBKVM_GETSWAPINFO */
67 #elif HAVE_LIBSTATGRAB
68 /* No global variables */
69 /* #endif HAVE_LIBSTATGRAB */
71 #else
72 # error "No applicable input method."
73 #endif /* HAVE_LIBSTATGRAB */
75 static int swap_init (void)
76 {
77 #if KERNEL_LINUX
78 /* No init stuff */
79 /* #endif KERNEL_LINUX */
81 #elif HAVE_LIBKSTAT
82 /* getpagesize(3C) tells me this does not fail.. */
83 pagesize = (unsigned long long) getpagesize ();
84 if (get_kstat (&ksp, "unix", 0, "system_pages"))
85 ksp = NULL;
86 /* #endif HAVE_LIBKSTAT */
88 #elif defined(VM_SWAPUSAGE)
89 /* No init stuff */
90 /* #endif defined(VM_SWAPUSAGE) */
92 #elif HAVE_LIBKVM_GETSWAPINFO
93 if (kvm_obj != NULL)
94 {
95 kvm_close (kvm_obj);
96 kvm_obj = NULL;
97 }
99 kvm_pagesize = getpagesize ();
101 if ((kvm_obj = kvm_open (NULL, /* execfile */
102 NULL, /* corefile */
103 NULL, /* swapfile */
104 O_RDONLY, /* flags */
105 NULL)) /* errstr */
106 == NULL)
107 {
108 ERROR ("swap plugin: kvm_open failed.");
109 return (-1);
110 }
111 /* #endif HAVE_LIBKVM_GETSWAPINFO */
113 #elif HAVE_LIBSTATGRAB
114 /* No init stuff */
115 #endif /* HAVE_LIBSTATGRAB */
117 return (0);
118 }
120 static void swap_submit (const char *type_instance, double value)
121 {
122 value_t values[1];
123 value_list_t vl = VALUE_LIST_INIT;
125 values[0].gauge = value;
127 vl.values = values;
128 vl.values_len = 1;
129 vl.time = time (NULL);
130 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
131 sstrncpy (vl.plugin, "swap", sizeof (vl.plugin));
132 sstrncpy (vl.type, "swap", sizeof (vl.type));
133 sstrncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
135 plugin_dispatch_values (&vl);
136 } /* void swap_submit */
138 static int swap_read (void)
139 {
140 #if KERNEL_LINUX
141 FILE *fh;
142 char buffer[1024];
144 char *fields[8];
145 int numfields;
147 unsigned long long swap_used = 0LL;
148 unsigned long long swap_cached = 0LL;
149 unsigned long long swap_free = 0LL;
150 unsigned long long swap_total = 0LL;
152 if ((fh = fopen ("/proc/meminfo", "r")) == NULL)
153 {
154 char errbuf[1024];
155 WARNING ("memory: fopen: %s",
156 sstrerror (errno, errbuf, sizeof (errbuf)));
157 return (-1);
158 }
160 while (fgets (buffer, 1024, fh) != NULL)
161 {
162 unsigned long long *val = NULL;
164 if (strncasecmp (buffer, "SwapTotal:", 10) == 0)
165 val = &swap_total;
166 else if (strncasecmp (buffer, "SwapFree:", 9) == 0)
167 val = &swap_free;
168 else if (strncasecmp (buffer, "SwapCached:", 11) == 0)
169 val = &swap_cached;
170 else
171 continue;
173 numfields = strsplit (buffer, fields, 8);
175 if (numfields < 2)
176 continue;
178 *val = atoll (fields[1]) * 1024LL;
179 }
181 if (fclose (fh))
182 {
183 char errbuf[1024];
184 WARNING ("memory: fclose: %s",
185 sstrerror (errno, errbuf, sizeof (errbuf)));
186 }
188 if ((swap_total == 0LL) || ((swap_free + swap_cached) > swap_total))
189 return (-1);
191 swap_used = swap_total - (swap_free + swap_cached);
193 swap_submit ("used", swap_used);
194 swap_submit ("free", swap_free);
195 swap_submit ("cached", swap_cached);
196 /* #endif KERNEL_LINUX */
198 #elif HAVE_LIBKSTAT
199 unsigned long long swap_alloc;
200 unsigned long long swap_resv;
201 unsigned long long swap_avail;
203 struct anoninfo ai;
205 if (swapctl (SC_AINFO, &ai) == -1)
206 {
207 char errbuf[1024];
208 ERROR ("swap plugin: swapctl failed: %s",
209 sstrerror (errno, errbuf, sizeof (errbuf)));
210 return (-1);
211 }
213 /*
214 * Calculations from:
215 * http://cvs.opensolaris.org/source/xref/on/usr/src/cmd/swap/swap.c
216 * Also see:
217 * http://www.itworld.com/Comp/2377/UIR980701perf/ (outdated?)
218 * /usr/include/vm/anon.h
219 *
220 * In short, swap -s shows: allocated + reserved = used, available
221 *
222 * However, Solaris does not allow to allocated/reserved more than the
223 * available swap (physical memory + disk swap), so the pedant may
224 * prefer: allocated + unallocated = reserved, available
225 *
226 * We map the above to: used + resv = n/a, free
227 *
228 * Does your brain hurt yet? - Christophe Kalt
229 *
230 * Oh, and in case you wonder,
231 * swap_alloc = pagesize * ( ai.ani_max - ai.ani_free );
232 * can suffer from a 32bit overflow.
233 */
234 swap_alloc = ai.ani_max - ai.ani_free;
235 swap_alloc *= pagesize;
236 swap_resv = ai.ani_resv + ai.ani_free - ai.ani_max;
237 swap_resv *= pagesize;
238 swap_avail = ai.ani_max - ai.ani_resv;
239 swap_avail *= pagesize;
241 swap_submit ("used", swap_alloc);
242 swap_submit ("free", swap_avail);
243 swap_submit ("reserved", swap_resv);
244 /* #endif HAVE_LIBKSTAT */
246 #elif defined(VM_SWAPUSAGE)
247 int mib[3];
248 size_t mib_len;
249 struct xsw_usage sw_usage;
250 size_t sw_usage_len;
252 mib_len = 2;
253 mib[0] = CTL_VM;
254 mib[1] = VM_SWAPUSAGE;
256 sw_usage_len = sizeof (struct xsw_usage);
258 if (sysctl (mib, mib_len, &sw_usage, &sw_usage_len, NULL, 0) != 0)
259 return (-1);
261 /* The returned values are bytes. */
262 swap_submit ("used", sw_usage.xsu_used);
263 swap_submit ("free", sw_usage.xsu_avail);
264 /* #endif VM_SWAPUSAGE */
266 #elif HAVE_LIBKVM_GETSWAPINFO
267 struct kvm_swap data_s;
268 int status;
270 unsigned long long used;
271 unsigned long long free;
272 unsigned long long total;
274 if (kvm_obj == NULL)
275 return (-1);
277 /* only one structure => only get the grand total, no details */
278 status = kvm_getswapinfo (kvm_obj, &data_s, 1, 0);
279 if (status == -1)
280 return (-1);
282 total = (unsigned long long) data_s.ksw_total;
283 used = (unsigned long long) data_s.ksw_used;
285 total *= (unsigned long long) kvm_pagesize;
286 used *= (unsigned long long) kvm_pagesize;
288 free = total - used;
290 swap_submit ("used", used);
291 swap_submit ("free", free);
292 /* #endif HAVE_LIBKVM_GETSWAPINFO */
294 #elif HAVE_LIBSTATGRAB
295 sg_swap_stats *swap;
297 swap = sg_get_swap_stats ();
299 if (swap == NULL)
300 return (-1);
302 swap_submit ("used", swap->used);
303 swap_submit ("free", swap->free);
304 #endif /* HAVE_LIBSTATGRAB */
306 return (0);
307 } /* int swap_read */
309 void module_register (void)
310 {
311 plugin_register_init ("swap", swap_init);
312 plugin_register_read ("swap", swap_read);
313 } /* void module_register */