2 * collectd - src/swap.c
3 * Copyright (C) 2005-2014 Florian octo Forster
4 * Copyright (C) 2009 Stefan Völkel
5 * Copyright (C) 2009 Manuel Sanmartin
6 * Copyright (C) 2010 Aurélien Reynaud
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; only version 2 of the License is applicable.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License for more details.
17 * You should have received a copy of the GNU General Public License along
18 * with this program; if not, write to the Free Software Foundation, Inc.,
19 * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
22 * Florian octo Forster <octo at collectd.org>
24 * Aurélien Reynaud <collectd at wattapower.net>
31 /* avoid swap.h error "Cannot use swapctl in the large files compilation environment" */
32 #if HAVE_SYS_SWAP_H && !defined(_LP64) && _FILE_OFFSET_BITS == 64
33 # undef _FILE_OFFSET_BITS
34 # undef _LARGEFILE64_SOURCE
42 # include <sys/swap.h>
48 # include <sys/param.h>
51 # include <sys/sysctl.h>
54 # include <sys/dkstat.h>
61 # include <statgrab.h>
65 # include <sys/protosw.h>
66 # include <libperfstat.h>
70 #define MAX(x,y) ((x) > (y) ? (x) : (y))
73 # define SWAP_HAVE_REPORT_BY_DEVICE 1
74 static derive_t pagesize;
75 static _Bool report_bytes = 0;
76 static _Bool report_by_device = 0;
77 /* #endif KERNEL_LINUX */
79 #elif HAVE_SWAPCTL && HAVE_SWAPCTL_TWO_ARGS
80 # define SWAP_HAVE_REPORT_BY_DEVICE 1
81 static derive_t pagesize;
82 static _Bool report_by_device = 0;
83 /* #endif HAVE_SWAPCTL && HAVE_SWAPCTL_TWO_ARGS */
85 #elif defined(VM_SWAPUSAGE)
86 /* No global variables */
87 /* #endif defined(VM_SWAPUSAGE) */
89 #elif HAVE_LIBKVM_GETSWAPINFO
90 static kvm_t *kvm_obj = NULL;
92 /* #endif HAVE_LIBKVM_GETSWAPINFO */
94 #elif HAVE_LIBSTATGRAB
95 /* No global variables */
96 /* #endif HAVE_LIBSTATGRAB */
100 /*# endif HAVE_PERFSTAT */
103 # error "No applicable input method."
104 #endif /* HAVE_LIBSTATGRAB */
106 static _Bool values_absolute = 1;
107 static _Bool values_percentage = 0;
109 static int swap_config (oconfig_item_t *ci) /* {{{ */
113 for (i = 0; i < ci->children_num; i++)
115 oconfig_item_t *child = ci->children + i;
116 if (strcasecmp ("ReportBytes", child->key) == 0)
118 cf_util_get_boolean (child, &report_bytes);
120 WARNING ("swap plugin: The \"ReportBytes\" option "
121 "is only valid under Linux. "
122 "The option is going to be ignored.");
124 else if (strcasecmp ("ReportByDevice", child->key) == 0)
125 #if SWAP_HAVE_REPORT_BY_DEVICE
126 cf_util_get_boolean (child, &report_by_device);
128 WARNING ("swap plugin: The \"ReportByDevice\" option "
129 "is not supported on this platform. "
130 "The option is going to be ignored.");
131 #endif /* SWAP_HAVE_REPORT_BY_DEVICE */
132 else if (strcasecmp ("ValuesAbsolute", child->key) == 0)
133 cf_util_get_boolean (child, &values_absolute);
134 else if (strcasecmp ("ValuesPercentage", child->key) == 0)
135 cf_util_get_boolean (child, &values_percentage);
137 WARNING ("swap plugin: Unknown config option: \"%s\"",
142 } /* }}} int swap_config */
144 static int swap_init (void) /* {{{ */
147 pagesize = (derive_t) sysconf (_SC_PAGESIZE);
148 /* #endif KERNEL_LINUX */
150 #elif HAVE_SWAPCTL && HAVE_SWAPCTL_TWO_ARGS
151 /* getpagesize(3C) tells me this does not fail.. */
152 pagesize = (derive_t) getpagesize ();
153 /* #endif HAVE_SWAPCTL */
155 #elif defined(VM_SWAPUSAGE)
157 /* #endif defined(VM_SWAPUSAGE) */
159 #elif HAVE_LIBKVM_GETSWAPINFO
160 char errbuf[_POSIX2_LINE_MAX];
168 kvm_pagesize = getpagesize ();
170 kvm_obj = kvm_openfiles (NULL, "/dev/null", NULL, O_RDONLY, errbuf);
174 ERROR ("swap plugin: kvm_openfiles failed, %s", errbuf);
177 /* #endif HAVE_LIBKVM_GETSWAPINFO */
179 #elif HAVE_LIBSTATGRAB
181 /* #endif HAVE_LIBSTATGRAB */
184 pagesize = getpagesize();
185 #endif /* HAVE_PERFSTAT */
188 } /* }}} int swap_init */
190 static void swap_submit_usage (char const *plugin_instance, /* {{{ */
191 gauge_t used, gauge_t free,
192 char const *other_name, gauge_t other_value)
195 value_list_t vl = VALUE_LIST_INIT;
198 vl.values_len = STATIC_ARRAY_SIZE (v);
199 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
200 sstrncpy (vl.plugin, "swap", sizeof (vl.plugin));
201 if (plugin_instance != NULL)
202 sstrncpy (vl.plugin_instance, plugin_instance,
203 sizeof (vl.plugin_instance));
204 sstrncpy (vl.type, "swap", sizeof (vl.type));
207 plugin_dispatch_multivalue (&vl, 0, DS_TYPE_GAUGE,
208 "used", used, "free", free,
209 other_name, other_value, NULL);
210 if (values_percentage)
211 plugin_dispatch_multivalue (&vl, 1, DS_TYPE_GAUGE,
212 "used", used, "free", free,
213 other_name, other_value, NULL);
214 } /* }}} void swap_submit_usage */
216 #if KERNEL_LINUX || HAVE_PERFSTAT
217 __attribute__((nonnull(1)))
218 static void swap_submit_derive (char const *type_instance, /* {{{ */
221 value_list_t vl = VALUE_LIST_INIT;
227 vl.values_len = STATIC_ARRAY_SIZE (v);
228 sstrncpy (vl.host, hostname_g, sizeof (vl.host));
229 sstrncpy (vl.plugin, "swap", sizeof (vl.plugin));
230 sstrncpy (vl.type, "swap_io", sizeof (vl.type));
231 sstrncpy (vl.type_instance, type_instance, sizeof (vl.type_instance));
233 plugin_dispatch_values (&vl);
234 } /* }}} void swap_submit_derive */
238 static int swap_read_separate (void) /* {{{ */
243 fh = fopen ("/proc/swaps", "r");
247 WARNING ("swap plugin: fopen (/proc/swaps) failed: %s",
248 sstrerror (errno, errbuf, sizeof (errbuf)));
252 while (fgets (buffer, sizeof (buffer), fh) != NULL)
262 numfields = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
266 sstrncpy (path, fields[0], sizeof (path));
267 escape_slashes (path, sizeof (path));
271 total = strtod (fields[2], &endptr);
272 if ((endptr == fields[2]) || (errno != 0))
277 used = strtod (fields[3], &endptr);
278 if ((endptr == fields[3]) || (errno != 0))
284 swap_submit_usage (path, used * 1024.0, (total - used) * 1024.0,
291 } /* }}} int swap_read_separate */
293 static int swap_read_combined (void) /* {{{ */
298 gauge_t swap_used = NAN;
299 gauge_t swap_cached = NAN;
300 gauge_t swap_free = NAN;
301 gauge_t swap_total = NAN;
303 fh = fopen ("/proc/meminfo", "r");
307 WARNING ("swap plugin: fopen (/proc/meminfo) failed: %s",
308 sstrerror (errno, errbuf, sizeof (errbuf)));
312 while (fgets (buffer, sizeof (buffer), fh) != NULL)
317 numfields = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
321 if (strcasecmp (fields[0], "SwapTotal:") == 0)
322 strtogauge (fields[1], &swap_total);
323 else if (strcasecmp (fields[0], "SwapFree:") == 0)
324 strtogauge (fields[1], &swap_free);
325 else if (strcasecmp (fields[0], "SwapCached:") == 0)
326 strtogauge (fields[1], &swap_cached);
331 if (isnan (swap_total) || isnan (swap_free))
334 /* Some systems, OpenVZ for example, don't provide SwapCached. */
335 if (isnan (swap_cached))
336 swap_used = swap_total - swap_free;
338 swap_used = swap_total - (swap_free + swap_cached);
339 assert (!isnan (swap_used));
344 swap_submit_usage (NULL, swap_used * 1024.0, swap_free * 1024.0,
345 isnan (swap_cached) ? NULL : "cached",
346 isnan (swap_cached) ? NAN : swap_cached * 1024.0);
348 } /* }}} int swap_read_combined */
350 static int swap_read_io (void) /* {{{ */
355 _Bool old_kernel = 0;
357 uint8_t have_data = 0;
358 derive_t swap_in = 0;
359 derive_t swap_out = 0;
361 fh = fopen ("/proc/vmstat", "r");
364 /* /proc/vmstat does not exist in kernels <2.6 */
365 fh = fopen ("/proc/stat", "r");
369 WARNING ("swap: fopen: %s",
370 sstrerror (errno, errbuf, sizeof (errbuf)));
377 while (fgets (buffer, sizeof (buffer), fh) != NULL)
382 numfields = strsplit (buffer, fields, STATIC_ARRAY_SIZE (fields));
389 if (strcasecmp ("pswpin", fields[0]) == 0)
391 strtoderive (fields[1], &swap_in);
394 else if (strcasecmp ("pswpout", fields[0]) == 0)
396 strtoderive (fields[1], &swap_out);
400 else /* if (old_kernel) */
405 if (strcasecmp ("page", fields[0]) == 0)
407 strtoderive (fields[1], &swap_in);
408 strtoderive (fields[2], &swap_out);
411 } /* while (fgets) */
415 if (have_data != 0x03)
420 swap_in = swap_in * pagesize;
421 swap_out = swap_out * pagesize;
424 swap_submit_derive ("in", swap_in);
425 swap_submit_derive ("out", swap_out);
428 } /* }}} int swap_read_io */
430 static int swap_read (void) /* {{{ */
432 if (report_by_device)
433 swap_read_separate ();
435 swap_read_combined ();
440 } /* }}} int swap_read */
441 /* #endif KERNEL_LINUX */
444 * Under Solaris, two mechanisms can be used to read swap statistics, swapctl
445 * and kstat. The former reads physical space used on a device, the latter
446 * reports the view from the virtual memory system. It was decided that the
447 * kstat-based information should be moved to the "vmem" plugin, but nobody
448 * with enough Solaris experience was available at that time to do this. The
449 * code below is still there for your reference but it won't be activated in
450 * *this* plugin again. --octo
452 #elif 0 && HAVE_LIBKSTAT
453 /* kstat-based read function */
454 static int swap_read_kstat (void) /* {{{ */
462 if (swapctl (SC_AINFO, &ai) == -1)
465 ERROR ("swap plugin: swapctl failed: %s",
466 sstrerror (errno, errbuf, sizeof (errbuf)));
472 * http://cvs.opensolaris.org/source/xref/on/usr/src/cmd/swap/swap.c
474 * http://www.itworld.com/Comp/2377/UIR980701perf/ (outdated?)
475 * /usr/include/vm/anon.h
477 * In short, swap -s shows: allocated + reserved = used, available
479 * However, Solaris does not allow to allocated/reserved more than the
480 * available swap (physical memory + disk swap), so the pedant may
481 * prefer: allocated + unallocated = reserved, available
483 * We map the above to: used + resv = n/a, free
485 * Does your brain hurt yet? - Christophe Kalt
487 * Oh, and in case you wonder,
488 * swap_alloc = pagesize * ( ai.ani_max - ai.ani_free );
489 * can suffer from a 32bit overflow.
491 swap_alloc = (gauge_t) ((ai.ani_max - ai.ani_free) * pagesize);
492 swap_resv = (gauge_t) ((ai.ani_resv + ai.ani_free - ai.ani_max) * pagesize);
493 swap_avail = (gauge_t) ((ai.ani_max - ai.ani_resv) * pagesize);
495 swap_submit_usage (NULL, swap_alloc, swap_avail, "reserved", swap_resv);
497 } /* }}} int swap_read_kstat */
498 /* #endif 0 && HAVE_LIBKSTAT */
500 #elif HAVE_SWAPCTL && HAVE_SWAPCTL_TWO_ARGS
501 /* swapctl-based read function */
502 static int swap_read (void) /* {{{ */
513 swap_num = swapctl (SC_GETNSWP, NULL);
516 ERROR ("swap plugin: swapctl (SC_GETNSWP) failed with status %i.",
520 else if (swap_num == 0)
523 /* Allocate and initialize the swaptbl_t structure */
524 s = malloc (swap_num * sizeof (swapent_t) + sizeof (struct swaptable));
527 ERROR ("swap plugin: malloc failed.");
531 /* Memory to store the path names. We only use these paths when the
532 * separate option has been configured, but it's easier to just
533 * allocate enough memory in any case. */
534 s_paths = calloc (swap_num, PATH_MAX);
537 ERROR ("swap plugin: calloc failed.");
541 for (i = 0; i < swap_num; i++)
542 s->swt_ent[i].ste_path = s_paths + (i * PATH_MAX);
545 status = swapctl (SC_LIST, s);
549 ERROR ("swap plugin: swapctl (SC_LIST) failed: %s",
550 sstrerror (errno, errbuf, sizeof (errbuf)));
555 else if (swap_num < status)
557 /* more elements returned than requested */
558 ERROR ("swap plugin: I allocated memory for %i structure%s, "
559 "but swapctl(2) claims to have returned %i. "
560 "I'm confused and will give up.",
561 swap_num, (swap_num == 1) ? "" : "s",
567 else if (swap_num > status)
568 /* less elements returned than requested */
571 for (i = 0; i < swap_num; i++)
577 if ((s->swt_ent[i].ste_flags & ST_INDEL) != 0)
580 this_total = (gauge_t) (s->swt_ent[i].ste_pages * pagesize);
581 this_avail = (gauge_t) (s->swt_ent[i].ste_free * pagesize);
583 /* Shortcut for the "combined" setting (default) */
584 if (!report_by_device)
591 sstrncpy (path, s->swt_ent[i].ste_path, sizeof (path));
592 escape_slashes (path, sizeof (path));
594 swap_submit_usage (path, this_total - this_avail, this_avail,
596 } /* for (swap_num) */
600 ERROR ("swap plugin: Total swap space (%g) is less than free swap space (%g).",
607 /* If the "separate" option was specified (report_by_device == 1), all
608 * values have already been dispatched from within the loop. */
609 if (!report_by_device)
610 swap_submit_usage (NULL, total - avail, avail, NULL, NAN);
615 } /* }}} int swap_read */
616 /* #endif HAVE_SWAPCTL && HAVE_SWAPCTL_TWO_ARGS */
618 #elif HAVE_SWAPCTL && HAVE_SWAPCTL_THREE_ARGS
619 static int swap_read (void) /* {{{ */
621 struct swapent *swap_entries;
629 swap_num = swapctl (SWAP_NSWAP, NULL, 0);
632 ERROR ("swap plugin: swapctl (SWAP_NSWAP) failed with status %i.",
636 else if (swap_num == 0)
639 swap_entries = calloc (swap_num, sizeof (*swap_entries));
640 if (swap_entries == NULL)
642 ERROR ("swap plugin: calloc failed.");
646 status = swapctl (SWAP_STATS, swap_entries, swap_num);
647 if (status != swap_num)
649 ERROR ("swap plugin: swapctl (SWAP_STATS) failed with status %i.",
651 sfree (swap_entries);
655 #if defined(DEV_BSIZE) && (DEV_BSIZE > 0)
656 # define C_SWAP_BLOCK_SIZE ((gauge_t) DEV_BSIZE)
658 # define C_SWAP_BLOCK_SIZE 512.0
661 /* TODO: Report per-device stats. The path name is available from
662 * swap_entries[i].se_path */
663 for (i = 0; i < swap_num; i++)
665 if ((swap_entries[i].se_flags & SWF_ENABLE) == 0)
668 used += ((gauge_t) swap_entries[i].se_inuse) * C_SWAP_BLOCK_SIZE;
669 total += ((gauge_t) swap_entries[i].se_nblks) * C_SWAP_BLOCK_SIZE;
674 ERROR ("swap plugin: Total swap space (%g) is less than used swap space (%g).",
679 swap_submit_usage (NULL, used, total - used, NULL, NAN);
681 sfree (swap_entries);
683 } /* }}} int swap_read */
684 /* #endif HAVE_SWAPCTL && HAVE_SWAPCTL_THREE_ARGS */
686 #elif defined(VM_SWAPUSAGE)
687 static int swap_read (void) /* {{{ */
691 struct xsw_usage sw_usage;
696 mib[1] = VM_SWAPUSAGE;
698 sw_usage_len = sizeof (struct xsw_usage);
700 if (sysctl (mib, mib_len, &sw_usage, &sw_usage_len, NULL, 0) != 0)
703 /* The returned values are bytes. */
704 swap_submit_usage (NULL,
705 (gauge_t) sw_usage.xsu_used, (gauge_t) sw_usage.xsu_avail,
709 } /* }}} int swap_read */
710 /* #endif VM_SWAPUSAGE */
712 #elif HAVE_LIBKVM_GETSWAPINFO
713 static int swap_read (void) /* {{{ */
715 struct kvm_swap data_s;
724 /* only one structure => only get the grand total, no details */
725 status = kvm_getswapinfo (kvm_obj, &data_s, 1, 0);
729 total = (gauge_t) data_s.ksw_total;
730 used = (gauge_t) data_s.ksw_used;
732 total *= (gauge_t) kvm_pagesize;
733 used *= (gauge_t) kvm_pagesize;
735 swap_submit_usage (NULL, used, total - used, NULL, NAN);
738 } /* }}} int swap_read */
739 /* #endif HAVE_LIBKVM_GETSWAPINFO */
741 #elif HAVE_LIBSTATGRAB
742 static int swap_read (void) /* {{{ */
746 swap = sg_get_swap_stats ();
750 swap_submit_usage (NULL, (gauge_t) swap->used, (gauge_t) swap->free,
754 } /* }}} int swap_read */
755 /* #endif HAVE_LIBSTATGRAB */
758 static int swap_read (void) /* {{{ */
760 perfstat_memory_total_t pmemory;
767 memset (&pmemory, 0, sizeof (pmemory));
768 status = perfstat_memory_total (NULL, &pmemory, sizeof(perfstat_memory_total_t), 1);
772 WARNING ("swap plugin: perfstat_memory_total failed: %s",
773 sstrerror (errno, errbuf, sizeof (errbuf)));
777 total = (gauge_t) (pmemory.pgsp_total * pagesize);
778 free = (gauge_t) (pmemory.pgsp_free * pagesize);
779 reserved = (gauge_t) (pmemory.pgsp_rsvd * pagesize);
781 swap_submit_usage (NULL, total - free, free, "reserved", reserved);
782 swap_submit_derive ("in", (derive_t) pmemory.pgspins * pagesize);
783 swap_submit_derive ("out", (derive_t) pmemory.pgspouts * pagesize);
786 } /* }}} int swap_read */
787 #endif /* HAVE_PERFSTAT */
789 void module_register (void)
791 plugin_register_complex_config ("swap", swap_config);
792 plugin_register_init ("swap", swap_init);
793 plugin_register_read ("swap", swap_read);
794 } /* void module_register */
796 /* vim: set fdm=marker : */