X-Git-Url: https://git.octo.it/?a=blobdiff_plain;f=src%2Fswap.c;h=de9b5f3de430ef08fa034df37aae168a9e0f1057;hb=daa4b5ab990fac569e684ab8850792bec0a19159;hp=c3e399d83fd5e3d13d0fb3f072cc974eb48f3e24;hpb=7fa270a1fb517c7fbed55d9f5f70bb28516b6229;p=collectd.git diff --git a/src/swap.c b/src/swap.c index c3e399d8..de9b5f3d 100644 --- a/src/swap.c +++ b/src/swap.c @@ -1,11 +1,10 @@ /** * collectd - src/swap.c - * Copyright (C) 2005 Florian octo Forster + * Copyright (C) 2005-2009 Florian octo Forster * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License as published by the - * Free Software Foundation; either version 2 of the License, or (at your - * option) any later version. + * Free Software Foundation; only version 2 of the License is applicable. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of @@ -20,73 +19,145 @@ * Florian octo Forster **/ -#include "swap.h" - -#if COLLECT_SWAP -#define MODULE_NAME "swap" - -#ifdef KERNEL_SOLARIS -#include -#endif /* KERNEL_SOLARIS */ - -#include "plugin.h" +#if HAVE_CONFIG_H +# include "config.h" +# undef HAVE_CONFIG_H +#endif +/* avoid swap.h error "Cannot use swapctl in the large files compilation environment" */ +#if HAVE_SYS_SWAP_H && !defined(_LP64) && _FILE_OFFSET_BITS == 64 +# undef _FILE_OFFSET_BITS +# undef _LARGEFILE64_SOURCE +#endif + +#include "collectd.h" #include "common.h" +#include "plugin.h" + +#if HAVE_SYS_SWAP_H +# include +#endif +#if HAVE_VM_ANON_H +# include +#endif +#if HAVE_SYS_PARAM_H +# include +#endif +#if HAVE_SYS_SYSCTL_H +# include +#endif +#if HAVE_SYS_DKSTAT_H +# include +#endif +#if HAVE_KVM_H +# include +#endif + +#if HAVE_STATGRAB_H +# include +#endif #undef MAX #define MAX(x,y) ((x) > (y) ? (x) : (y)) -static char *swap_file = "swap.rrd"; +#if KERNEL_LINUX +/* No global variables */ +/* #endif KERNEL_LINUX */ -/* 1099511627776 == 1TB ought to be enough for anyone ;) */ -static char *ds_def[] = -{ - "DS:used:GAUGE:25:0:1099511627776", - "DS:free:GAUGE:25:0:1099511627776", - "DS:cached:GAUGE:25:0:1099511627776", - "DS:resv:GAUGE:25:0:1099511627776", - NULL -}; -static int ds_num = 4; - -#ifdef KERNEL_SOLARIS -static int pagesize; +#elif HAVE_LIBKSTAT +static unsigned long long pagesize; static kstat_t *ksp; -#endif /* KERNEL_SOLARIS */ +/* #endif HAVE_LIBKSTAT */ + +#elif HAVE_SWAPCTL +/* No global variables */ +/* #endif HAVE_SWAPCTL */ + +#elif defined(VM_SWAPUSAGE) +/* No global variables */ +/* #endif defined(VM_SWAPUSAGE) */ + +#elif HAVE_LIBKVM_GETSWAPINFO +static kvm_t *kvm_obj = NULL; +int kvm_pagesize; +/* #endif HAVE_LIBKVM_GETSWAPINFO */ -void module_init (void) +#elif HAVE_LIBSTATGRAB +/* No global variables */ +/* #endif HAVE_LIBSTATGRAB */ + +#else +# error "No applicable input method." +#endif /* HAVE_LIBSTATGRAB */ + +static int swap_init (void) { -#ifdef KERNEL_SOLARIS +#if KERNEL_LINUX + /* No init stuff */ +/* #endif KERNEL_LINUX */ + +#elif HAVE_LIBKSTAT /* getpagesize(3C) tells me this does not fail.. */ - pagesize = getpagesize (); + pagesize = (unsigned long long) getpagesize (); if (get_kstat (&ksp, "unix", 0, "system_pages")) ksp = NULL; -#endif /* KERNEL_SOLARIS */ +/* #endif HAVE_LIBKSTAT */ - return; -} +#elif HAVE_SWAPCTL + /* No init stuff */ +/* #endif HAVE_SWAPCTL */ -void module_write (char *host, char *inst, char *val) -{ - rrd_update_file (host, swap_file, val, ds_def, ds_num); +#elif defined(VM_SWAPUSAGE) + /* No init stuff */ +/* #endif defined(VM_SWAPUSAGE) */ + +#elif HAVE_LIBKVM_GETSWAPINFO + if (kvm_obj != NULL) + { + kvm_close (kvm_obj); + kvm_obj = NULL; + } + + kvm_pagesize = getpagesize (); + + if ((kvm_obj = kvm_open (NULL, /* execfile */ + NULL, /* corefile */ + NULL, /* swapfile */ + O_RDONLY, /* flags */ + NULL)) /* errstr */ + == NULL) + { + ERROR ("swap plugin: kvm_open failed."); + return (-1); + } +/* #endif HAVE_LIBKVM_GETSWAPINFO */ + +#elif HAVE_LIBSTATGRAB + /* No init stuff */ +#endif /* HAVE_LIBSTATGRAB */ + + return (0); } -void module_submit (unsigned long long swap_used, - unsigned long long swap_free, - unsigned long long swap_cached, - unsigned long long swap_resv) +static void swap_submit (const char *type_instance, double value) { - char buffer[512]; + value_t values[1]; + value_list_t vl = VALUE_LIST_INIT; - if (snprintf (buffer, 512, "N:%llu:%llu:%llu:%llu", swap_used, - swap_free, swap_cached, swap_resv) >= 512) - return; + values[0].gauge = value; - plugin_submit (MODULE_NAME, "-", buffer); -} + vl.values = values; + vl.values_len = 1; + sstrncpy (vl.host, hostname_g, sizeof (vl.host)); + sstrncpy (vl.plugin, "swap", sizeof (vl.plugin)); + sstrncpy (vl.type, "swap", sizeof (vl.type)); + sstrncpy (vl.type_instance, type_instance, sizeof (vl.type_instance)); + + plugin_dispatch_values (&vl); +} /* void swap_submit */ -void module_read (void) +static int swap_read (void) { -#ifdef KERNEL_LINUX +#if KERNEL_LINUX FILE *fh; char buffer[1024]; @@ -100,8 +171,10 @@ void module_read (void) if ((fh = fopen ("/proc/meminfo", "r")) == NULL) { - syslog (LOG_WARNING, "memory: fopen: %s", strerror (errno)); - return; + char errbuf[1024]; + WARNING ("memory: fopen: %s", + sstrerror (errno, errbuf, sizeof (errbuf))); + return (-1); } while (fgets (buffer, 1024, fh) != NULL) @@ -126,71 +199,213 @@ void module_read (void) } if (fclose (fh)) - syslog (LOG_WARNING, "memory: fclose: %s", strerror (errno)); + { + char errbuf[1024]; + WARNING ("memory: fclose: %s", + sstrerror (errno, errbuf, sizeof (errbuf))); + } if ((swap_total == 0LL) || ((swap_free + swap_cached) > swap_total)) - return; + return (-1); swap_used = swap_total - (swap_free + swap_cached); - module_submit (swap_used, swap_free, swap_cached, -1LL); -/* #endif defined(KERNEL_LINUX) */ + swap_submit ("used", swap_used); + swap_submit ("free", swap_free); + swap_submit ("cached", swap_cached); +/* #endif KERNEL_LINUX */ -#elif defined(KERNEL_SOLARIS) +#elif HAVE_LIBKSTAT unsigned long long swap_alloc; unsigned long long swap_resv; unsigned long long swap_avail; - /* unsigned long long swap_free; */ - - long long availrmem; - long long swapfs_minfree; struct anoninfo ai; if (swapctl (SC_AINFO, &ai) == -1) - return; - - availrmem = get_kstat_value (ksp, "availrmem"); - swapfs_minfree = get_kstat_value (ksp, "minfree"); - - if ((availrmem < 0LL) || (swapfs_minfree < 0LL)) - return; + { + char errbuf[1024]; + ERROR ("swap plugin: swapctl failed: %s", + sstrerror (errno, errbuf, sizeof (errbuf))); + return (-1); + } - /* - * Calculations learned by reading - * http://www.itworld.com/Comp/2377/UIR980701perf/ + /* + * Calculations from: + * http://cvs.opensolaris.org/source/xref/on/usr/src/cmd/swap/swap.c + * Also see: + * http://www.itworld.com/Comp/2377/UIR980701perf/ (outdated?) + * /usr/include/vm/anon.h * - * swap_resv += ani_resv - * swap_alloc += MAX(ani_resv, ani_max) - ani_free - * swap_avail += MAX(ani_max - ani_resv, 0) + (availrmem - swapfs_minfree) - * swap_free += ani_free + (availrmem - swapfs_minfree) + * In short, swap -s shows: allocated + reserved = used, available * - * To clear up the terminology a bit: - * resv = reserved (but not neccessarily used) - * alloc = used (neccessarily reserved) - * avail = not reserved (neccessarily free) - * free = not allocates (possibly reserved) + * However, Solaris does not allow to allocated/reserved more than the + * available swap (physical memory + disk swap), so the pedant may + * prefer: allocated + unallocated = reserved, available + * + * We map the above to: used + resv = n/a, free + * + * Does your brain hurt yet? - Christophe Kalt + * + * Oh, and in case you wonder, + * swap_alloc = pagesize * ( ai.ani_max - ai.ani_free ); + * can suffer from a 32bit overflow. */ - swap_resv = pagesize * ai.ani_resv; - swap_alloc = pagesize * (MAX(ai.ani_resv, ai.ani_max) - ai.ani_free); - swap_avail = pagesize * (MAX(ai.ani_max - ai.ani_resv, 0) + (availrmem - swapfs_minfree)); - /* swap_free = pagesize * (ai.ani_free + (availrmem - swapfs_minfree)); */ + swap_alloc = ai.ani_max - ai.ani_free; + swap_alloc *= pagesize; + swap_resv = ai.ani_resv + ai.ani_free - ai.ani_max; + swap_resv *= pagesize; + swap_avail = ai.ani_max - ai.ani_resv; + swap_avail *= pagesize; + + swap_submit ("used", swap_alloc); + swap_submit ("free", swap_avail); + swap_submit ("reserved", swap_resv); +/* #endif HAVE_LIBKSTAT */ + +#elif HAVE_SWAPCTL + struct swapent *swap_entries; + int swap_num; + int status; + int i; + + uint64_t used = 0; + uint64_t total = 0; + + /* + * XXX: This is the syntax for the *BSD `swapctl', which has the + * following prototype: + * swapctl (int cmd, void *arg, int misc); + * + * HP-UX and Solaris (and possibly other UNIXes) provide `swapctl', + * too, but with the following prototype: + * swapctl (int cmd, void *arg); + * + * Solaris is usually handled in the KSTAT case above. For other UNIXes + * a separate case for the other version of `swapctl' may be necessary. + */ + swap_num = swapctl (SWAP_NSWAP, NULL, 0); + if (swap_num < 0) + { + ERROR ("swap plugin: swapctl (SWAP_NSWAP) failed with status %i.", + swap_num); + return (-1); + } + else if (swap_num == 0) + return (0); + + swap_entries = calloc (swap_num, sizeof (*swap_entries)); + if (swap_entries == NULL) + { + ERROR ("swap plugin: calloc failed."); + return (-1); + } + + status = swapctl (SWAP_STATS, swap_entries, swap_num); + if (status != swap_num) + { + ERROR ("swap plugin: swapctl (SWAP_STATS) failed with status %i.", + status); + sfree (swap_entries); + return (-1); + } + +#if defined(DEV_BSIZE) && (DEV_BSIZE > 0) +# define C_SWAP_BLOCK_SIZE ((uint64_t) DEV_BSIZE) +#else +# define C_SWAP_BLOCK_SIZE ((uint64_t) 512) +#endif + + for (i = 0; i < swap_num; i++) + { + if ((swap_entries[i].se_flags & SWF_ENABLE) == 0) + continue; + + used += ((uint64_t) swap_entries[i].se_inuse) + * C_SWAP_BLOCK_SIZE; + total += ((uint64_t) swap_entries[i].se_nblks) + * C_SWAP_BLOCK_SIZE; + } + + if (total < used) + { + ERROR ("swap plugin: Total swap space (%"PRIu64") " + "is less than used swap space (%"PRIu64").", + total, used); + return (-1); + } + + swap_submit ("used", (gauge_t) used); + swap_submit ("free", (gauge_t) (total - used)); - module_submit (swap_alloc, swap_avail, -1LL, swap_resv - swap_alloc); -/* #endif defined(KERNEL_SOLARIS) */ + sfree (swap_entries); +/* #endif HAVE_SWAPCTL */ -#elif defined(HAVE_LIBSTATGRAB) +#elif defined(VM_SWAPUSAGE) + int mib[3]; + size_t mib_len; + struct xsw_usage sw_usage; + size_t sw_usage_len; + + mib_len = 2; + mib[0] = CTL_VM; + mib[1] = VM_SWAPUSAGE; + + sw_usage_len = sizeof (struct xsw_usage); + + if (sysctl (mib, mib_len, &sw_usage, &sw_usage_len, NULL, 0) != 0) + return (-1); + + /* The returned values are bytes. */ + swap_submit ("used", sw_usage.xsu_used); + swap_submit ("free", sw_usage.xsu_avail); +/* #endif VM_SWAPUSAGE */ + +#elif HAVE_LIBKVM_GETSWAPINFO + struct kvm_swap data_s; + int status; + + unsigned long long used; + unsigned long long free; + unsigned long long total; + + if (kvm_obj == NULL) + return (-1); + + /* only one structure => only get the grand total, no details */ + status = kvm_getswapinfo (kvm_obj, &data_s, 1, 0); + if (status == -1) + return (-1); + + total = (unsigned long long) data_s.ksw_total; + used = (unsigned long long) data_s.ksw_used; + + total *= (unsigned long long) kvm_pagesize; + used *= (unsigned long long) kvm_pagesize; + + free = total - used; + + swap_submit ("used", used); + swap_submit ("free", free); +/* #endif HAVE_LIBKVM_GETSWAPINFO */ + +#elif HAVE_LIBSTATGRAB sg_swap_stats *swap; - if ((swap = sg_get_swap_stats ()) != NULL) - module_submit (swap->used, swap->free, -1LL, -1LL); + swap = sg_get_swap_stats (); + + if (swap == NULL) + return (-1); + + swap_submit ("used", swap->used); + swap_submit ("free", swap->free); #endif /* HAVE_LIBSTATGRAB */ -} + + return (0); +} /* int swap_read */ void module_register (void) { - plugin_register (MODULE_NAME, module_init, module_read, module_write); -} - -#undef MODULE_NAME -#endif /* COLLECT_SWAP */ + plugin_register_init ("swap", swap_init); + plugin_register_read ("swap", swap_read); +} /* void module_register */