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net-snmp/agent/mibgroup/ucd-snmp/vmstat_solaris2.c

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/*
* vmstat_solaris2.c
* UCD SNMP module for systemStats section of UCD-SNMP-MIB for SunOS/Solaris
* Jochen Kmietsch <kmietsch@jochen.de>
* with fixes and additions from the UCD-SNMP community
* Uses some ideas from xosview and top
* Some comments paraphrased from the SUN man pages
* Version 0.1 initial release (Dec 1999)
* Version 0.2 added support for multiprocessor machines (Jan 2000)
* Version 0.3 some reliability enhancements and compile time fixes (Feb 2000)
* Version 0.4 portability issue and raw cpu value support (Jun 2000)
* Version 0.5 64-bit Solaris support and new data gathering routine (Aug 2000)
* Version 0.6 Memory savings, overroll precautions and lint checks (Aug 2000)
* Version 0.7 More raw counters and some cosmetic changes (Jan 2001)
*
*/
/*
* To make lint skip the debug code and stop complaining
*/
#ifdef __lint
#define NETSNMP_NO_DEBUGGING 1
#endif
/*
* Includes start here
*/
/*
* Standard includes
*/
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/time.h>
#include <string.h>
/*
* kstat and sysinfo structs
*/
#include <kstat.h>
#include <sys/sysinfo.h>
#include <net-snmp/net-snmp-config.h>
#include <net-snmp/net-snmp-includes.h>
#include <net-snmp/agent/net-snmp-agent-includes.h>
#include "mibdefs.h"
#include "util_funcs/header_generic.h"
/*
* Header file for this module
*/
#include "vmstat.h"
#include "vmstat_solaris2.h"
/*
* Includes end here
*/
/*
* Global structures start here
*/
/*
* A structure to save data gathered from the kernel kstat interface to.
* We used to have the sys/sysinfo.h cpu_stat_t here but we did not need
* all of it, some in a different size and some additional ones so we build
* our own
*/
struct cpu_stat_snapshot {
hrtime_t css_time;
unsigned int css_cpus;
unsigned long long css_swapin;
unsigned long long css_swapout;
unsigned long long css_blocks_read;
unsigned long long css_blocks_write;
unsigned long long css_interrupts;
unsigned long long css_context_sw;
unsigned long long css_cpu[CPU_STATES];
};
/*
* Global structures end here
*/
/*
* Global variables start here
*/
/*
* From kstat.h:
* Provides access to the kernel statistics library by
* initializing a kstat control structure and returning a pointer
* to this structure. This pointer must be used as the kc argument in
* following function calls from libkstat (here kc is called kstat_fd).
* Pointer to structure to be opened with kstat_open in main procedure.
* We share this one with memory_solaris2 and kernel_sunos5, where it's
* defined.
*/
extern kstat_ctl_t *kstat_fd;
/*
* Variables for the calculated values, filled in update_stats
* Need to be global since we need them in more than one function
*/
static ulong swapin;
static ulong swapout;
static ulong blocks_read;
static ulong blocks_write;
static ulong interrupts;
static ulong context_sw;
/*
* Since MIB wants CPU_SYSTEM, which is CPU_KERNEL + CPU_WAIT
*/
static long cpu_perc[CPU_STATES + 1];
/*
* How many snapshots we have already taken, needed for the first
* POLL_INTERVAL * POLL_VALUES seconds of agent running
*/
static unsigned int number_of_snapshots;
/*
* The place to store the snapshots of system data in
*/
static struct cpu_stat_snapshot snapshot[POLL_VALUES + 1];
/*
* And one for the raw counters, which we fill when the raw values are
* requested, as opposed to the absolute values, which are taken every
* POLL_INTERVAL seconds and calculated over POLL_INTERVAL * POLL_VALUES time
*/
static struct cpu_stat_snapshot raw_values;
/*
* Global variables end here
*/
/*
* Functions start here
*/
/*
* Function prototype
*/
static void update_stats(unsigned int registrationNumber,
void *clientarg);
static int take_snapshot(struct cpu_stat_snapshot *css);
/*
* init_vmstat_solaris2 starts here
* Init function for this module, from prototype
* Defines variables handled by this module, defines root OID for
* this module and registers it with the agent
*/
FindVarMethod var_extensible_vmstat;
void
init_vmstat_solaris2(void)
{
/*
* Which variables do we service ?
*/
struct variable2 extensible_vmstat_variables[] = {
{MIBINDEX, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {MIBINDEX}},
{ERRORNAME, ASN_OCTET_STR, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {ERRORNAME}},
{SWAPIN, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {SWAPIN}},
{SWAPOUT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {SWAPOUT}},
{IOSENT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {IOSENT}},
{IORECEIVE, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {IORECEIVE}},
{SYSINTERRUPTS, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {SYSINTERRUPTS}},
{SYSCONTEXT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {SYSCONTEXT}},
{CPUUSER, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {CPUUSER}},
{CPUSYSTEM, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {CPUSYSTEM}},
{CPUIDLE, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {CPUIDLE}},
{CPURAWUSER, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {CPURAWUSER}},
{CPURAWSYSTEM, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {CPURAWSYSTEM}},
{CPURAWIDLE, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {CPURAWIDLE}},
{CPURAWWAIT, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {CPURAWWAIT}},
{CPURAWKERNEL, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {CPURAWKERNEL}},
{IORAWSENT, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {IORAWSENT}},
{IORAWRECEIVE, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
var_extensible_vmstat, 1, {IORAWRECEIVE}},
/*
* Future use:
* {ERRORFLAG, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
* var_extensible_vmstat, 1, {ERRORFLAG }},
* {ERRORMSG, ASN_OCTET_STR, NETSNMP_OLDAPI_RONLY,
* var_extensible_vmstat, 1, {ERRORMSG }}
*/
};
/*
* Define the OID pointer to the top of the mib tree that we're
* registering underneath
*/
oid vmstat_variables_oid[] = { NETSNMP_UCDAVIS_MIB, 11 };
/*
* register ourselves with the agent to handle our mib tree
* LINTED Trust me, I know what I'm doing
*/
REGISTER_MIB("ucd-snmp/vmstat", extensible_vmstat_variables, variable2,
vmstat_variables_oid);
/*
* First check whether shared kstat contol is NULL, if so, try to open our
* own.
*/
if (kstat_fd == NULL) {
kstat_fd = kstat_open();
}
/*
* Then check whether either shared kstat was found or we succeeded in
* opening our own.
*/
if (kstat_fd == NULL) {
snmp_log(LOG_ERR,
"vmstat_solaris2 (init): kstat_open() failed and no shared kstat control found.\n");
}
/*
* Start with some useful data
*/
update_stats(0, NULL);
/*
* update_stats is run every POLL_INTERVAL seconds using this routine
* (see 'man snmp_alarm')
* This is only executed once to get some useful data in the beginning
*/
if (snmp_alarm_register(5, NULL, update_stats, NULL) == 0) {
snmp_log(LOG_WARNING,
"vmstat_solaris2 (init): snmp_alarm_register failed.\n");
}
/*
* This is the one that runs update_stats every POLL_INTERVAL seconds
*/
if (snmp_alarm_register(POLL_INTERVAL, SA_REPEAT, update_stats, NULL)
== 0) {
snmp_log(LOG_ERR,
"vmstat_solaris2 (init): snmp_alarm_register failed, cannot service requests.\n");
}
} /* init_vmstat_solaris2 ends here */
/*
* Data collection function take_snapshot starts here
* Get data from kernel and save into the snapshot strutcs
* Argument is the snapshot struct to save to. Global anyway, but looks nicer
*/
static int
take_snapshot(struct cpu_stat_snapshot *css)
{
/*
* Variables start here
*/
/*
* From sys/kstat.h (included from kstat.h):
* Pointer to current kstat
*/
kstat_t *ksp;
/*
* Counters
*/
unsigned int cpu_num = 0;
/*
* High resolution time counter
*/
hrtime_t current_time;
/*
* see sys/sysinfo.h, holds CPU data
*/
cpu_stat_t cs;
/*
* The usual stuff to count on, err, by
*/
int i;
/*
* Variables end here
*/
/*
* Function starts here
*/
/*
* Get time
*/
current_time = gethrtime();
/*
* If we have just gotten the data, return the values from last run (skip if-clause)
* This happens on a snmpwalk request. No need to read the kstat again
* if we just did it less than 2 seconds ago
* Jumps into if-clause either when snapshot is empty or when too old
*/
if ((css->css_time == 0)
|| (current_time > css->css_time + 2000000000)) {
/*
* Make sure we clean up before we put new data into snapshot
*/
memset(css, 0, sizeof *css);
/*
* Update timer
*/
css->css_time = current_time;
/*
* Look thru all the cpu slots on the machine whether they holds a CPU
* and if so, get the data from that CPU
* We walk through the whole kstat chain and sum up all the found cpu_stat kstats,
* there's one for every CPU in a machine
*/
for (ksp = kstat_fd->kc_chain; ksp != NULL; ksp = ksp->ks_next) {
/*
* If we encounter an invalid kstat, skip it and continue with next one
*/
if (ksp->ks_flags & KSTAT_FLAG_INVALID) {
continue;
}
if (strcmp(ksp->ks_module, "cpu_stat") == 0) {
/*
* Yeah, we found a CPU.
*/
cpu_num++;
/*
* Read data from kstat into cs structure
* kstat_fd is the control structure, ksp the kstat we are reading
* and cs the buffer we are writing to.
*/
if ((ksp->ks_type != KSTAT_TYPE_RAW) ||
(ksp->ks_data_size != sizeof cs) ||
(kstat_read(kstat_fd, ksp, &cs) == -1)) {
snmp_log(LOG_ERR,
"vmstat_solaris2 (take_snapshot): could not read cs structure.\n");
return (-1);
}
/*
* Get the data from the cs structure and sum it up in our own structure
*/
css->css_swapin +=
(unsigned long long) cs.cpu_vminfo.swapin;
css->css_swapout +=
(unsigned long long) cs.cpu_vminfo.swapout;
css->css_blocks_read +=
(unsigned long long) cs.cpu_sysinfo.bread;
css->css_blocks_write +=
(unsigned long long) cs.cpu_sysinfo.bwrite;
css->css_interrupts +=
(unsigned long long) cs.cpu_sysinfo.intr;
css->css_context_sw +=
(unsigned long long) cs.cpu_sysinfo.pswitch;
/*
* We need a for-loop for the CPU values
*/
cs.cpu_sysinfo.cpu[CPU_WAIT] = cs.cpu_sysinfo.wait[W_IO] +
cs.cpu_sysinfo.wait[W_PIO];
for (i = 0; i < CPU_STATES; i++) {
css->css_cpu[i] +=
(unsigned long long) cs.cpu_sysinfo.cpu[i];
} /* end for */
} /* end if */
} /* end for */
/*
* Increment number of CPUs we gathered data from, for future use
*/
css->css_cpus = cpu_num;
}
/*
* All engines running at warp speed, no problems (if there are any engines, that is)
*/
return (cpu_num > 0 ? 0 : -1);
} /* take_snapshot ends here */
/*
* This gets called every POLL_INTERVAL seconds to update the snapshots. It takes a new snapshot and
* drops the oldest one. This way we move the time window so we always take the values over
* POLL_INTERVAL * POLL_VALUES seconds and update the data used every POLL_INTERVAL seconds
* The alarm timer is in the init function of this module (snmp_alarm_register)
* ARGSUSED0
*/
static void
update_stats(unsigned int registrationNumber, void *clientarg)
{
/*
* The time between the samples we compare
*/
hrtime_t time_diff;
/*
* Easier to use these than the snapshots, short hand pointers
*/
struct cpu_stat_snapshot *css_old, *css_new;
/*
* The usual stuff to count on, err, by
*/
int i;
/*
* Kstat chain id, to check whether kstat chain changed
*/
kid_t kid;
/*
* The sum of the CPU ticks that have passed on the different CPU states, so we can calculate
* the percentages of each state
*/
unsigned long long cpu_sum = 0;
DEBUGMSGTL(("ucd-snmp/vmstat_solaris2.c:update_stats",
"updating stats\n"));
/*
* Just in case someone added (or removed) some CPUs during operation (or other kstat chain changes)
*/
kid = kstat_chain_update(kstat_fd);
if (kid != 0) {
if (kid == -1) {
snmp_log(LOG_WARNING,
"vmstat_solaris2 (update_stats): Could not update kstat chain.\n");
} else {
/*
* On some machines this floods the logfile, thus commented out
* snmp_log(LOG_INFO, "vmstat_solaris2 (update_stats): Kstat chain changed.");
*/
}
}
/*
* Take the current snapshot
*/
if (take_snapshot(&snapshot[0]) == -1) {
snmp_log(LOG_WARNING,
"vmstat_solaris2 (update_stats): Something went wrong with take_snapshot.\n");
return;
}
/*
* Do we have some data we can use ? An issue right after the start of the agent
*/
if (number_of_snapshots > 0) {
/*
* Huh, the number of CPUs changed during run time. That is indeed s.th. worth noting, we
* output a humorous (more or less) syslog message and need to retake the snapshots
*/
if (snapshot[0].css_cpus != snapshot[1].css_cpus) {
if (snapshot[0].css_cpus > snapshot[1].css_cpus) {
snmp_log(LOG_NOTICE,
"vmstat_solaris2 (update_stats): Cool ! Number of CPUs increased, must be hot-pluggable.\n");
} else {
snmp_log(LOG_NOTICE,
"vmstat_solaris2 (update_stats): Lost at least one CPU, RIP.\n");
}
/*
* Make all snapshots but the current one invalid
*/
number_of_snapshots = 1;
/*
* Move the current one in the "first" [1] slot
*/
memmove(&snapshot[1], &snapshot[0], sizeof snapshot[0]);
/*
* Erase the current one
*/
memset(&snapshot[0], 0, sizeof snapshot[0]);
/*
* Try to get a new snapshot in five seconds so we can return s.th. useful
*/
if (snmp_alarm_register(5, NULL, update_stats, NULL) == 0) {
snmp_log(LOG_WARNING,
"vmstat_solaris2 (update_stats): snmp_alarm_register failed.\n");
}
return;
}
/*
* Short hand pointers
*/
css_new = &snapshot[0];
css_old = &snapshot[number_of_snapshots];
/*
* How much time has passed between the snapshots we get the values from ?
* Time is in nanoseconds so a few zeros here to juggle with
* But the hrtime is not subject to change (s.b. setting the clock), unlike the normal time
*/
time_diff =
(snapshot[0].css_time -
snapshot[number_of_snapshots].css_time) / 1000000;
if ( time_diff == 0 ) { time_diff = 1; } /* Protect against division-by-zero */
DEBUGMSGTL(("ucd-snmp/vmstat_solaris2.c:update_stats",
"time_diff: %lld\n", time_diff));
/*
* swapin and swapout are in pages, MIB wants kB/s,so we just need to get kB and seconds
* For the others we need to get value per second
* getpagesize() returns pagesize in bytes
* decided to use sysconf(_SC_PAGESIZE) instead to get around an #ifndef (I don't like those)
* that was needed b/c some old Solaris versions don't have getpagesize()
*/
/*
* LINTED cast needed, really
*/
swapin =
(uint_t) ((css_new->css_swapin -
css_old->css_swapin) * (hrtime_t) 1000 *
sysconf(_SC_PAGESIZE) / 1024 / time_diff);
/*
* LINTED cast needed, really
*/
swapout =
(uint_t) ((css_new->css_swapout -
css_old->css_swapout) * (hrtime_t) 1000 *
sysconf(_SC_PAGESIZE) / 1024 / time_diff);
/*
* LINTED cast needed, really
*/
blocks_read =
(uint_t) ((css_new->css_blocks_read -
css_old->css_blocks_read) * (hrtime_t) 1000 /
time_diff);
/*
* LINTED cast needed, really
*/
blocks_write =
(uint_t) ((css_new->css_blocks_write -
css_old->css_blocks_write) * (hrtime_t) 1000 /
time_diff);
/*
* LINTED cast needed, really
*/
interrupts =
(uint_t) ((css_new->css_interrupts -
css_old->css_interrupts) * (hrtime_t) 1000 /
time_diff);
/*
* LINTED cast needed, really
*/
context_sw =
(uint_t) ((css_new->css_context_sw -
css_old->css_context_sw) * (hrtime_t) 1000 /
time_diff);
/*
* Loop thru all the CPU_STATES and get the differences
*/
for (i = 0; i < CPU_STATES; i++) {
cpu_sum += (css_new->css_cpu[i] - css_old->css_cpu[i]);
}
/*
* Now calculate the absolute percentage values
* Looks somewhat complicated sometimes but tries to get around using floats to increase speed
*/
for (i = 0; i < CPU_STATES; i++) {
/*
* Since we don't return fractions we use + 0.5 to get between 99 and 101 percent adding the values
* together, otherwise we would get less than 100 most of the time
*/
/*
* LINTED has to be 'long'
*/
cpu_perc[i] =
(long) (((css_new->css_cpu[i] -
css_old->css_cpu[i]) * 100 +
(cpu_sum / 2)) / cpu_sum);
}
/*
* As said before, MIB wants CPU_SYSTEM which is CPU_KERNEL + CPU_WAIT
*/
/*
* LINTED has to be 'long'
*/
cpu_perc[CPU_SYSTEM] =
(long) ((((css_new->css_cpu[CPU_KERNEL] -
css_old->css_cpu[CPU_KERNEL])
+ (css_new->css_cpu[CPU_WAIT] -
css_old->css_cpu[CPU_WAIT]))
* 100 + (cpu_sum / 2)) / cpu_sum);
}
/*
* Make the current one the first one and move the whole thing one place down
*/
memmove(&snapshot[1], &snapshot[0],
(size_t) (((char *) &snapshot[POLL_VALUES]) -
((char *) &snapshot[0])));
/*
* Erase the current one
*/
memset(&snapshot[0], 0, sizeof snapshot[0]);
/*
* Only important on start up, we keep track of how many snapshots we have taken so far
*/
if (number_of_snapshots < POLL_VALUES) {
number_of_snapshots++;
}
} /* update_stats ends here */
/*
* *var_extensible_vmstat starts here
* The guts of the module, this routine gets called to service a request
*/
unsigned char *
var_extensible_vmstat(struct variable *vp,
oid * name,
size_t * length,
int exact,
size_t * var_len, WriteMethod ** write_method)
{
/*
* Needed for returning the values
*/
static long long_ret;
static char errmsg[300];
/*
* set to 0 as default
*/
long_ret = 0;
/*
* generic check whether the options passed make sense and whether the
* right variable is requested
*/
if (header_generic(vp, name, length, exact, var_len, write_method) !=
MATCH_SUCCEEDED) {
return (NULL);
}
/*
* The function that actually returns s.th.
*/
switch (vp->magic) {
case MIBINDEX:
long_ret = 1;
return ((u_char *) (&long_ret));
case ERRORNAME: /* dummy name */
sprintf(errmsg, "systemStats");
*var_len = strlen(errmsg);
return ((u_char *) (errmsg));
case SWAPIN:
return ((u_char *) (&swapin));
case SWAPOUT:
return ((u_char *) (&swapout));
case IOSENT:
return ((u_char *) (&blocks_write));
case IORECEIVE:
return ((u_char *) (&blocks_read));
case SYSINTERRUPTS:
return ((u_char *) (&interrupts));
case SYSCONTEXT:
return ((u_char *) (&context_sw));
case CPUUSER:
return ((u_char *) (&cpu_perc[CPU_USER]));
case CPUSYSTEM:
return ((u_char *) (&cpu_perc[CPU_SYSTEM]));
case CPUIDLE:
return ((u_char *) (&cpu_perc[CPU_IDLE]));
case CPURAWUSER:
take_snapshot(&raw_values);
/*
* LINTED has to be 'long'
*/
long_ret =
(long) (raw_values.css_cpu[CPU_USER] / raw_values.css_cpus);
return ((u_char *) (&long_ret));
/*
* We are missing CPURAWNICE, Solaris does not account for this in the kernel so this OID can not
* be returned. Also, these values will roll over sooner or later and then return inaccurate data
* but the MIB wants Integer32 so we cannot put a counter here
* (Has been changed to Counter32 in the latest MIB version!)
*/
case CPURAWSYSTEM:
take_snapshot(&raw_values);
/*
* LINTED has to be 'long'
*/
long_ret =
(long) ((raw_values.css_cpu[CPU_KERNEL] +
raw_values.css_cpu[CPU_WAIT]) / raw_values.css_cpus);
return ((u_char *) (&long_ret));
case CPURAWIDLE:
take_snapshot(&raw_values);
/*
* LINTED has to be 'long'
*/
long_ret =
(long) (raw_values.css_cpu[CPU_IDLE] / raw_values.css_cpus);
return ((u_char *) (&long_ret));
case CPURAWWAIT:
take_snapshot(&raw_values);
/*
* LINTED has to be 'long'
*/
long_ret =
(long) (raw_values.css_cpu[CPU_WAIT] / raw_values.css_cpus);
return ((u_char *) (&long_ret));
case CPURAWKERNEL:
take_snapshot(&raw_values);
/*
* LINTED has to be 'long'
*/
long_ret =
(long) (raw_values.css_cpu[CPU_KERNEL] / raw_values.css_cpus);
return ((u_char *) (&long_ret));
case IORAWSENT:
long_ret = (long) (raw_values.css_blocks_write);
return ((u_char *) (&long_ret));
case IORAWRECEIVE:
long_ret = (long) (raw_values.css_blocks_read);
return ((u_char *) (&long_ret));
/*
* reserved for future use
*/
/*
* case ERRORFLAG:
* return((u_char *) (&long_ret));
* case ERRORMSG:
* return((u_char *) (&long_ret));
*/
default:
snmp_log(LOG_ERR,
"vmstat_solaris2: Error in request, no match for %d.\n",
vp->magic);
}
return (NULL);
} /* *var_extensible_vmstat ends here */
/*
* Functions end here
*/
/*
* Program ends here
*/
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