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memory.c
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memory.c
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/**
* collectd - src/memory.c
* Copyright (C) 2005-2014 Florian octo Forster
* Copyright (C) 2009 Simon Kuhnle
* Copyright (C) 2009 Manuel Sanmartin
*
* 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; 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* Authors:
* Florian octo Forster <octo at collectd.org>
* Simon Kuhnle <simon at blarzwurst.de>
* Manuel Sanmartin
**/
#include "collectd.h"
#include "common.h"
#include "plugin.h"
#ifdef HAVE_SYS_SYSCTL_H
#include <sys/sysctl.h>
#endif
#ifdef HAVE_SYS_VMMETER_H
#include <sys/vmmeter.h>
#endif
#ifdef HAVE_MACH_KERN_RETURN_H
#include <mach/kern_return.h>
#endif
#ifdef HAVE_MACH_MACH_INIT_H
#include <mach/mach_init.h>
#endif
#ifdef HAVE_MACH_MACH_HOST_H
#include <mach/mach_host.h>
#endif
#ifdef HAVE_MACH_HOST_PRIV_H
#include <mach/host_priv.h>
#endif
#ifdef HAVE_MACH_VM_STATISTICS_H
#include <mach/vm_statistics.h>
#endif
#if HAVE_STATGRAB_H
#include <statgrab.h>
#endif
#if HAVE_PERFSTAT
#include <libperfstat.h>
#include <sys/protosw.h>
#endif /* HAVE_PERFSTAT */
/* vm_statistics_data_t */
#if HAVE_HOST_STATISTICS
static mach_port_t port_host;
static vm_size_t pagesize;
/* #endif HAVE_HOST_STATISTICS */
#elif HAVE_SYSCTLBYNAME
/* no global variables */
/* #endif HAVE_SYSCTLBYNAME */
#elif KERNEL_LINUX
/* no global variables */
/* #endif KERNEL_LINUX */
#elif HAVE_LIBKSTAT
static int pagesize;
static kstat_t *ksp;
static kstat_t *ksz;
/* #endif HAVE_LIBKSTAT */
#elif HAVE_SYSCTL
static int pagesize;
/* #endif HAVE_SYSCTL */
#elif HAVE_LIBSTATGRAB
/* no global variables */
/* endif HAVE_LIBSTATGRAB */
#elif HAVE_PERFSTAT
static int pagesize;
/* endif HAVE_PERFSTAT */
#else
#error "No applicable input method."
#endif
static _Bool values_absolute = 1;
static _Bool values_percentage = 0;
static int memory_config(oconfig_item_t *ci) /* {{{ */
{
for (int i = 0; i < ci->children_num; i++) {
oconfig_item_t *child = ci->children + i;
if (strcasecmp("ValuesAbsolute", child->key) == 0)
cf_util_get_boolean(child, &values_absolute);
else if (strcasecmp("ValuesPercentage", child->key) == 0)
cf_util_get_boolean(child, &values_percentage);
else
ERROR("memory plugin: Invalid configuration option: "
"\"%s\".",
child->key);
}
return (0);
} /* }}} int memory_config */
static int memory_init(void) {
#if HAVE_HOST_STATISTICS
port_host = mach_host_self();
host_page_size(port_host, &pagesize);
/* #endif HAVE_HOST_STATISTICS */
#elif HAVE_SYSCTLBYNAME
/* no init stuff */
/* #endif HAVE_SYSCTLBYNAME */
#elif defined(KERNEL_LINUX)
/* no init stuff */
/* #endif KERNEL_LINUX */
#elif defined(HAVE_LIBKSTAT)
/* getpagesize(3C) tells me this does not fail.. */
pagesize = getpagesize();
if (get_kstat(&ksp, "unix", 0, "system_pages") != 0) {
ksp = NULL;
return (-1);
}
if (get_kstat(&ksz, "zfs", 0, "arcstats") != 0) {
ksz = NULL;
return (-1);
}
/* #endif HAVE_LIBKSTAT */
#elif HAVE_SYSCTL
pagesize = getpagesize();
if (pagesize <= 0) {
ERROR("memory plugin: Invalid pagesize: %i", pagesize);
return (-1);
}
/* #endif HAVE_SYSCTL */
#elif HAVE_LIBSTATGRAB
/* no init stuff */
/* #endif HAVE_LIBSTATGRAB */
#elif HAVE_PERFSTAT
pagesize = getpagesize();
#endif /* HAVE_PERFSTAT */
return (0);
} /* int memory_init */
#define MEMORY_SUBMIT(...) \
do { \
if (values_absolute) \
plugin_dispatch_multivalue(vl, 0, DS_TYPE_GAUGE, __VA_ARGS__, NULL); \
if (values_percentage) \
plugin_dispatch_multivalue(vl, 1, DS_TYPE_GAUGE, __VA_ARGS__, NULL); \
} while (0)
static int memory_read_internal(value_list_t *vl) {
#if HAVE_HOST_STATISTICS
kern_return_t status;
vm_statistics_data_t vm_data;
mach_msg_type_number_t vm_data_len;
gauge_t wired;
gauge_t active;
gauge_t inactive;
gauge_t free;
if (!port_host || !pagesize)
return (-1);
vm_data_len = sizeof(vm_data) / sizeof(natural_t);
if ((status = host_statistics(port_host, HOST_VM_INFO, (host_info_t)&vm_data,
&vm_data_len)) != KERN_SUCCESS) {
ERROR("memory-plugin: host_statistics failed and returned the value %i",
(int)status);
return (-1);
}
/*
* From <http://docs.info.apple.com/article.html?artnum=107918>:
*
* Wired memory
* This information can't be cached to disk, so it must stay in RAM.
* The amount depends on what applications you are using.
*
* Active memory
* This information is currently in RAM and actively being used.
*
* Inactive memory
* This information is no longer being used and has been cached to
* disk, but it will remain in RAM until another application needs
* the space. Leaving this information in RAM is to your advantage if
* you (or a client of your computer) come back to it later.
*
* Free memory
* This memory is not being used.
*/
wired = (gauge_t)(((uint64_t)vm_data.wire_count) * ((uint64_t)pagesize));
active = (gauge_t)(((uint64_t)vm_data.active_count) * ((uint64_t)pagesize));
inactive =
(gauge_t)(((uint64_t)vm_data.inactive_count) * ((uint64_t)pagesize));
free = (gauge_t)(((uint64_t)vm_data.free_count) * ((uint64_t)pagesize));
MEMORY_SUBMIT("wired", wired, "active", active, "inactive", inactive, "free",
free);
/* #endif HAVE_HOST_STATISTICS */
#elif HAVE_SYSCTLBYNAME
/*
* vm.stats.vm.v_page_size: 4096
* vm.stats.vm.v_page_count: 246178
* vm.stats.vm.v_free_count: 28760
* vm.stats.vm.v_wire_count: 37526
* vm.stats.vm.v_active_count: 55239
* vm.stats.vm.v_inactive_count: 113730
* vm.stats.vm.v_cache_count: 10809
*/
const char *sysctl_keys[8] = {
"vm.stats.vm.v_page_size", "vm.stats.vm.v_page_count",
"vm.stats.vm.v_free_count", "vm.stats.vm.v_wire_count",
"vm.stats.vm.v_active_count", "vm.stats.vm.v_inactive_count",
"vm.stats.vm.v_cache_count", NULL};
double sysctl_vals[8];
for (int i = 0; sysctl_keys[i] != NULL; i++) {
int value;
size_t value_len = sizeof(value);
if (sysctlbyname(sysctl_keys[i], (void *)&value, &value_len, NULL, 0) ==
0) {
sysctl_vals[i] = value;
DEBUG("memory plugin: %26s: %g", sysctl_keys[i], sysctl_vals[i]);
} else {
sysctl_vals[i] = NAN;
}
} /* for (sysctl_keys) */
/* multiply all all page counts with the pagesize */
for (int i = 1; sysctl_keys[i] != NULL; i++)
if (!isnan(sysctl_vals[i]))
sysctl_vals[i] *= sysctl_vals[0];
MEMORY_SUBMIT("free", (gauge_t)sysctl_vals[2], "wired",
(gauge_t)sysctl_vals[3], "active", (gauge_t)sysctl_vals[4],
"inactive", (gauge_t)sysctl_vals[5], "cache",
(gauge_t)sysctl_vals[6]);
/* #endif HAVE_SYSCTLBYNAME */
#elif KERNEL_LINUX
FILE *fh;
char buffer[1024];
char *fields[8];
int numfields;
_Bool detailed_slab_info = 0;
gauge_t mem_total = 0;
gauge_t mem_used = 0;
gauge_t mem_buffered = 0;
gauge_t mem_cached = 0;
gauge_t mem_free = 0;
gauge_t mem_slab_total = 0;
gauge_t mem_slab_reclaimable = 0;
gauge_t mem_slab_unreclaimable = 0;
if ((fh = fopen("/proc/meminfo", "r")) == NULL) {
char errbuf[1024];
WARNING("memory: fopen: %s", sstrerror(errno, errbuf, sizeof(errbuf)));
return (-1);
}
while (fgets(buffer, sizeof(buffer), fh) != NULL) {
gauge_t *val = NULL;
if (strncasecmp(buffer, "MemTotal:", 9) == 0)
val = &mem_total;
else if (strncasecmp(buffer, "MemFree:", 8) == 0)
val = &mem_free;
else if (strncasecmp(buffer, "Buffers:", 8) == 0)
val = &mem_buffered;
else if (strncasecmp(buffer, "Cached:", 7) == 0)
val = &mem_cached;
else if (strncasecmp(buffer, "Slab:", 5) == 0)
val = &mem_slab_total;
else if (strncasecmp(buffer, "SReclaimable:", 13) == 0) {
val = &mem_slab_reclaimable;
detailed_slab_info = 1;
} else if (strncasecmp(buffer, "SUnreclaim:", 11) == 0) {
val = &mem_slab_unreclaimable;
detailed_slab_info = 1;
} else
continue;
numfields = strsplit(buffer, fields, STATIC_ARRAY_SIZE(fields));
if (numfields < 2)
continue;
*val = 1024.0 * atof(fields[1]);
}
if (fclose(fh)) {
char errbuf[1024];
WARNING("memory: fclose: %s", sstrerror(errno, errbuf, sizeof(errbuf)));
}
if (mem_total < (mem_free + mem_buffered + mem_cached + mem_slab_total))
return (-1);
mem_used =
mem_total - (mem_free + mem_buffered + mem_cached + mem_slab_total);
/* SReclaimable and SUnreclaim were introduced in kernel 2.6.19
* They sum up to the value of Slab, which is available on older & newer
* kernels. So SReclaimable/SUnreclaim are submitted if available, and Slab
* if not. */
if (detailed_slab_info)
MEMORY_SUBMIT("used", mem_used, "buffered", mem_buffered, "cached",
mem_cached, "free", mem_free, "slab_unrecl",
mem_slab_unreclaimable, "slab_recl", mem_slab_reclaimable);
else
MEMORY_SUBMIT("used", mem_used, "buffered", mem_buffered, "cached",
mem_cached, "free", mem_free, "slab", mem_slab_total);
/* #endif KERNEL_LINUX */
#elif HAVE_LIBKSTAT
/* Most of the additions here were taken as-is from the k9toolkit from
* Brendan Gregg and are subject to change I guess */
long long mem_used;
long long mem_free;
long long mem_lock;
long long mem_kern;
long long mem_unus;
long long arcsize;
long long pp_kernel;
long long physmem;
long long availrmem;
if (ksp == NULL)
return (-1);
if (ksz == NULL)
return (-1);
mem_used = get_kstat_value(ksp, "pagestotal");
mem_free = get_kstat_value(ksp, "pagesfree");
mem_lock = get_kstat_value(ksp, "pageslocked");
arcsize = get_kstat_value(ksz, "size");
pp_kernel = get_kstat_value(ksp, "pp_kernel");
physmem = get_kstat_value(ksp, "physmem");
availrmem = get_kstat_value(ksp, "availrmem");
mem_kern = 0;
mem_unus = 0;
if ((mem_used < 0LL) || (mem_free < 0LL) || (mem_lock < 0LL)) {
WARNING("memory plugin: one of used, free or locked is negative.");
return (-1);
}
mem_unus = physmem - mem_used;
if (mem_used < (mem_free + mem_lock)) {
/* source: http://wesunsolve.net/bugid/id/4909199
* this seems to happen when swap space is small, e.g. 2G on a 32G system
* we will make some assumptions here
* educated solaris internals help welcome here */
DEBUG("memory plugin: pages total is smaller than \"free\" "
"+ \"locked\". This is probably due to small "
"swap space");
mem_free = availrmem;
mem_used = 0;
} else {
mem_used -= mem_free + mem_lock;
}
/* mem_kern is accounted for in mem_lock */
if (pp_kernel < mem_lock) {
mem_kern = pp_kernel;
mem_lock -= pp_kernel;
} else {
mem_kern = mem_lock;
mem_lock = 0;
}
mem_used *= pagesize; /* If this overflows you have some serious */
mem_free *= pagesize; /* memory.. Why not call me up and give me */
mem_lock *= pagesize; /* some? ;) */
mem_kern *= pagesize; /* it's 2011 RAM is cheap */
mem_unus *= pagesize;
mem_kern -= arcsize;
MEMORY_SUBMIT("used", (gauge_t)mem_used, "free", (gauge_t)mem_free, "locked",
(gauge_t)mem_lock, "kernel", (gauge_t)mem_kern, "arc",
(gauge_t)arcsize, "unusable", (gauge_t)mem_unus);
/* #endif HAVE_LIBKSTAT */
#elif HAVE_SYSCTL
int mib[] = {CTL_VM, VM_METER};
struct vmtotal vmtotal = {0};
gauge_t mem_active;
gauge_t mem_inactive;
gauge_t mem_free;
size_t size;
size = sizeof(vmtotal);
if (sysctl(mib, 2, &vmtotal, &size, NULL, 0) < 0) {
char errbuf[1024];
WARNING("memory plugin: sysctl failed: %s",
sstrerror(errno, errbuf, sizeof(errbuf)));
return (-1);
}
assert(pagesize > 0);
mem_active = (gauge_t)(vmtotal.t_arm * pagesize);
mem_inactive = (gauge_t)((vmtotal.t_rm - vmtotal.t_arm) * pagesize);
mem_free = (gauge_t)(vmtotal.t_free * pagesize);
MEMORY_SUBMIT("active", mem_active, "inactive", mem_inactive, "free",
mem_free);
/* #endif HAVE_SYSCTL */
#elif HAVE_LIBSTATGRAB
sg_mem_stats *ios;
ios = sg_get_mem_stats();
if (ios == NULL)
return (-1);
MEMORY_SUBMIT("used", (gauge_t)ios->used, "cached", (gauge_t)ios->cache,
"free", (gauge_t)ios->free);
/* #endif HAVE_LIBSTATGRAB */
#elif HAVE_PERFSTAT
perfstat_memory_total_t pmemory = {0};
if (perfstat_memory_total(NULL, &pmemory, sizeof(pmemory), 1) < 0) {
char errbuf[1024];
WARNING("memory plugin: perfstat_memory_total failed: %s",
sstrerror(errno, errbuf, sizeof(errbuf)));
return (-1);
}
/* Unfortunately, the AIX documentation is not very clear on how these
* numbers relate to one another. The only thing is states explcitly
* is:
* real_total = real_process + real_free + numperm + real_system
*
* Another segmentation, which would be closer to the numbers reported
* by the "svmon" utility, would be:
* real_total = real_free + real_inuse
* real_inuse = "active" + real_pinned + numperm
*/
MEMORY_SUBMIT("free", (gauge_t)(pmemory.real_free * pagesize), "cached",
(gauge_t)(pmemory.numperm * pagesize), "system",
(gauge_t)(pmemory.real_system * pagesize), "user",
(gauge_t)(pmemory.real_process * pagesize));
#endif /* HAVE_PERFSTAT */
return (0);
} /* }}} int memory_read_internal */
static int memory_read(void) /* {{{ */
{
value_t v[1];
value_list_t vl = VALUE_LIST_INIT;
vl.values = v;
vl.values_len = STATIC_ARRAY_SIZE(v);
sstrncpy(vl.plugin, "memory", sizeof(vl.plugin));
sstrncpy(vl.type, "memory", sizeof(vl.type));
vl.time = cdtime();
return (memory_read_internal(&vl));
} /* }}} int memory_read */
void module_register(void) {
plugin_register_complex_config("memory", memory_config);
plugin_register_init("memory", memory_init);
plugin_register_read("memory", memory_read);
} /* void module_register */