798 lines
22 KiB
C
798 lines
22 KiB
C
/*
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* vmstat_dynix.c
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* UCD SNMP module for systemStats section of UCD-SNMP-MIB for Dynix
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* Patrick Hess <phess@phess.best.vwh.net>
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*
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* This is just a port of the vmstat_solaris2 code Version 0.7
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*
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*/
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/*
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* To make lint skip the debug code and stop complaining
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*/
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#ifdef __lint
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#define NETSNMP_NO_DEBUGGING 1
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#endif
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#define __NO_ASM_MACRO 1
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/*
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* Includes start here
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*/
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#include <net-snmp/net-snmp-config.h>
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/*
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* Standard includes
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*/
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#include <sys/tmp_ctl.h>
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#include <sys/sysperf.h>
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#include <sys/vmmeter.h>
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#include <unistd.h>
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#include <string.h>
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#include <net-snmp/net-snmp-includes.h>
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#include <net-snmp/agent/net-snmp-agent-includes.h>
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#include "mibdefs.h"
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#include "util_funcs/header_generic.h"
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/*
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* Header file for this module
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*/
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#include "vmstat.h"
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#include "vmstat_dynix.h"
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/*
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* Includes end here
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*/
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/*
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* Global structures start here
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*/
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/*
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* A structure to save data gathered from the kernel kstat interface to.
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*/
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/*
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* We used to have the sys/sysinfo.h cpu_stat_t here but we did not need
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*/
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/*
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* all of it, some in a different size and some additional ones so we build
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*/
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/*
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* our own
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*/
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struct cpu_stat_snapshot {
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time_t css_time;
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unsigned int css_cpus;
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unsigned long long css_swapin;
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unsigned long long css_swapout;
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unsigned long long css_blocks_read;
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unsigned long long css_blocks_write;
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unsigned long long css_interrupts;
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unsigned long long css_context_sw;
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unsigned long long css_cpu[V_CPU_STATES];
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};
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/*
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* Global structures end here
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*/
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/*
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* Global variables start here
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*/
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/*
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* Variables for the calculated values, filled in update_stats
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*/
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/*
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* Need to be global since we need them in more than one function
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*/
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static ulong swapin;
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static ulong swapout;
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static ulong blocks_read;
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static ulong blocks_write;
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static ulong interrupts;
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static ulong context_sw;
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/*
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* Since MIB wants V_CPU_SYSTEM, which is V_CPU_KERNEL + V_CPU_STREAM
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*/
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static long cpu_perc[V_CPU_STATES + 1];
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/*
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* How many snapshots we have already taken, needed for the first
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*/
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/*
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* POLL_INTERVAL * POLL_VALUES seconds of agent running
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*/
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static unsigned int number_of_snapshots;
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/*
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* The place to store the snapshots of system data in
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*/
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static struct cpu_stat_snapshot snapshot[POLL_VALUES + 1];
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/*
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* And one for the raw counters, which we fill when the raw values are
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*/
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/*
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* requested, as opposed to the absolute values, which are taken every
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*/
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/*
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* POLL_INTERVAL seconds and calculated over POLL_INTERVAL * POLL_VALUES time
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*/
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static struct cpu_stat_snapshot raw_values;
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/*
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* Global variables end here
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*/
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/*
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* Functions start here
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*/
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/*
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* Function prototype
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*/
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static void update_stats(unsigned int registrationNumber,
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void *clientarg);
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static int take_snapshot(struct cpu_stat_snapshot *css);
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/*
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* init_vmstat_dynix starts here
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*/
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/*
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* Init function for this module, from prototype
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*/
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/*
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* Defines variables handled by this module, defines root OID for
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*/
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/*
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* this module and registers it with the agent
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*/
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FindVarMethod var_extensible_vmstat;
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void
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init_vmstat_dynix(void)
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{
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/*
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* Which variables do we service ?
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*/
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struct variable2 extensible_vmstat_variables[] = {
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{MIBINDEX, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {MIBINDEX}},
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{ERRORNAME, ASN_OCTET_STR, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {ERRORNAME}},
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{SWAPIN, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {SWAPIN}},
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{SWAPOUT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {SWAPOUT}},
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{IOSENT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {IOSENT}},
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{IORECEIVE, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {IORECEIVE}},
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{SYSINTERRUPTS, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {SYSINTERRUPTS}},
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{SYSCONTEXT, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {SYSCONTEXT}},
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{CPUUSER, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {CPUUSER}},
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{CPUSYSTEM, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {CPUSYSTEM}},
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{CPUIDLE, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {CPUIDLE}},
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{CPURAWUSER, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {CPURAWUSER}},
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{CPURAWSYSTEM, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {CPURAWSYSTEM}},
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{CPURAWIDLE, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {CPURAWIDLE}},
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{CPURAWWAIT, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {CPURAWWAIT}},
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{CPURAWKERNEL, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {CPURAWKERNEL}},
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{IORAWSENT, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {IORAWSENT}},
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{IORAWRECEIVE, ASN_COUNTER, NETSNMP_OLDAPI_RONLY,
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var_extensible_vmstat, 1, {IORAWRECEIVE}},
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/*
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* Future use:
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*/
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/*
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* {ERRORFLAG, ASN_INTEGER, NETSNMP_OLDAPI_RONLY,
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* var_extensible_vmstat, 1, {ERRORFLAG }},
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* {ERRORMSG, ASN_OCTET_STR, NETSNMP_OLDAPI_RONLY,
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* var_extensible_vmstat, 1, {ERRORMSG }}
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*/
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};
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/*
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* Define the OID pointer to the top of the mib tree that we're
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*/
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/*
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* registering underneath
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*/
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oid vmstat_variables_oid[] = { NETSNMP_UCDAVIS_MIB, 11 };
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/*
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* register ourselves with the agent to handle our mib tree
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*/
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/*
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* LINTED Trust me, I know what I'm doing
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*/
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REGISTER_MIB("ucd-snmp/vmstat", extensible_vmstat_variables, variable2,
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vmstat_variables_oid);
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/*
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* Start with some useful data
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*/
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update_stats(0, NULL);
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/*
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* update_stats is run every POLL_INTERVAL seconds using this routine
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*/
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/*
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* (see 'man snmp_alarm')
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*/
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/*
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* This is only executed once to get some useful data in the beginning
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*/
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if (snmp_alarm_register(5, NULL, update_stats, NULL) == 0) {
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snmp_log(LOG_WARNING,
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"vmstat_dynix (init): snmp_alarm_register failed.\n");
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}
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/*
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* This is the one that runs update_stats every POLL_INTERVAL seconds
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*/
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if (snmp_alarm_register(POLL_INTERVAL, SA_REPEAT, update_stats, NULL)
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== 0) {
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snmp_log(LOG_ERR,
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"vmstat_dynix (init): snmp_alarm_register failed, cannot service requests.\n");
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}
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} /* init_vmstat_dynix ends here */
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/*
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* Data collection function take_snapshot starts here
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*/
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/*
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* Get data from kernel and save into the snapshot strutcs
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*/
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/*
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* Argument is the snapshot struct to save to. Global anyway, but looks nicer
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*/
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static int
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take_snapshot(struct cpu_stat_snapshot *css)
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{
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/*
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* Variables start here
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*/
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/*
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* Counters
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*/
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unsigned int cpu_num = 0;
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/*
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* Low resolution time counter
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*/
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time_t current_time;
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/*
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* see sys/sysperf.h, holds CPU data
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*/
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exp_vmmeter_t *cs, *origcs = 0;
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/*
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* size of the cs struct
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*/
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size_t vminfo_size;
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/*
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* The usual stuff to count on, err, by
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*/
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int i;
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int engnum = 0;
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/*
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* Variables end here
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*/
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/*
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* Function starts here
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*/
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/*
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* Get time
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*/
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current_time = time(0);
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/*
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* If we have just gotten the data, return the values from last run (skip if-clause)
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*/
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/*
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* This happens on a snmpwalk request.
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*/
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/*
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* if we just did it less than 2 seconds ago
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*/
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/*
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* Jumps into if-clause either when snapshot is empty or when too old
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*/
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if ((css->css_time == 0) || (current_time > css->css_time + 2)) {
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/*
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* Make sure we clean up before we put new data into snapshot
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*/
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memset(css, 0, sizeof *css);
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/*
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* Get the number of CPUs we gather data from
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*/
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if ((cpu_num = tmp_ctl(TMP_NENG, 0)) < 0) {
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snmp_log(LOG_ERR,
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"vmstat_dynix: (take snapshot) bad tmp_ctl return\n");
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return (-1);
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}
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css->css_cpus = cpu_num;
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vminfo_size = cpu_num * sizeof(exp_vmmeter_t);
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if (!(cs = (exp_vmmeter_t *) malloc(vminfo_size))) {
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snmp_log(LOG_ERR,
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"vmstat_dynix: (take_snapshot) bad malloc return\n");
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return (-1);
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}
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origcs = cs;
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/*
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* Update timer
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*/
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css->css_time = current_time;
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/*
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* Read data from kernel into cs structure
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*/
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/*
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* cs is the buffer we are writing to and
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*/
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/*
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* vminfo_size is the size of the cs struct
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*/
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if ((getkerndata(VMMETER_DATAID, cs, vminfo_size)) < 0) {
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snmp_log(LOG_ERR,
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"vmstat_dynix (take_snapshot): getkerndata failure.");
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return (-1);
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}
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/*
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* Get the data from each CPU
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*/
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/*
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* We walk through the whole vmmeter struct and sum up all the found stats,
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*/
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/*
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* there's one for every CPU in a machine
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*/
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/*
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* Okay... you can't laugh at this! I'm a C-hack, not a C-coder. :)
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*/
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while (engnum < cpu_num) {
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/*
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* Get the data from the cs structure and sum it up in our own structure
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*/
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css->css_swapin += (unsigned long long) cs->v_swpin;
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css->css_swapout += (unsigned long long) cs->v_swpout;
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css->css_blocks_read += (unsigned long long) cs->v_phread;
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css->css_blocks_write += (unsigned long long) cs->v_phwrite;
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css->css_interrupts += (unsigned long long) cs->v_intr;
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css->css_context_sw += (unsigned long long) cs->v_swtch;
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/*
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* We need a for-loop for the CPU STATE values
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*/
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for (i = 0; i < V_CPU_STATES; i++) {
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css->css_cpu[i] += (unsigned long long) cs->v_time[i];
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} /* end for */
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cs++;
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engnum++;
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} /* end while */
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}
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free((void *) origcs);
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/*
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* All engines running at warp speed, no problems (if there are any engines, that is)
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*/
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return (cpu_num > 0 ? 0 : -1);
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} /* take_snapshot ends here */
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/*
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* This gets called every POLL_INTERVAL seconds to update the snapshots. It takes a new snapshot and
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*/
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/*
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* drops the oldest one. This way we move the time window so we always take the values over
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*/
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/*
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* POLL_INTERVAL * POLL_VALUES seconds and update the data used every POLL_INTERVAL seconds
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*/
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/*
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* The alarm timer is in the init function of this module (snmp_alarm_register)
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*/
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/*
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* ARGSUSED0
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*/
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static void
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update_stats(unsigned int registrationNumber, void *clientarg)
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{
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/*
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* The time between the samples we compare
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*/
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time_t time_diff;
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/*
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* Easier to use these than the snapshots, short hand pointers
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*/
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struct cpu_stat_snapshot *css_old, *css_new;
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/*
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* The usual stuff to count on, err, by
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*/
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int i;
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/*
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* The sum of the CPU ticks that have passed on the different CPU states, so we can calculate
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*/
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/*
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* the percentages of each state
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*/
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unsigned long long cpu_sum = 0;
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DEBUGMSGTL(("ucd-snmp/vmstat_dynix.c:update_stats",
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"updating stats\n"));
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/*
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* Take the current snapshot
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*/
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if (take_snapshot(&snapshot[0]) == -1) {
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snmp_log(LOG_WARNING,
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"vmstat_dynix (update_stats): Something went wrong with take_snapshot.");
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return;
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}
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/*
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* Do we have some data we can use ? An issue right after the start of the agent
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*/
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if (number_of_snapshots > 0) {
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/*
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* Huh, the number of CPUs changed during run time. That is indeed s.th. worth noting, we
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*/
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/*
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* output a humorous (more or less) syslog message and need to retake the snapshots
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*/
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if (snapshot[0].css_cpus != snapshot[1].css_cpus) {
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if (snapshot[0].css_cpus > snapshot[1].css_cpus) {
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snmp_log(LOG_NOTICE,
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"vmstat_dynix (update_stats): Cool ! Number of CPUs increased, must be hot-pluggable.");
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} else {
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snmp_log(LOG_NOTICE,
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"vmstat_dynix (update_stats): Lost at least one CPU, RIP.");
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}
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/*
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* Make all snapshots but the current one invalid
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*/
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number_of_snapshots = 1;
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/*
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* Move the current one in the "first" [1] slot
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*/
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memmove(&snapshot[1], &snapshot[0], sizeof snapshot[0]);
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/*
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* Erase the current one
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*/
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memset(&snapshot[0], 0, sizeof snapshot[0]);
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/*
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* Try to get a new snapshot in five seconds so we can return s.th. useful
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*/
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if (snmp_alarm_register(5, NULL, update_stats, NULL) == 0) {
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snmp_log(LOG_WARNING,
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"vmstat_dynix (update_stats): snmp_alarm_register failed.\n");
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}
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return;
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}
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/*
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* Short hand pointers
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*/
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css_new = &snapshot[0];
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css_old = &snapshot[number_of_snapshots];
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/*
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* How much time has passed between the snapshots we get the values from ?
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*/
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/*
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* Time is in seconds
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*/
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time_diff =
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snapshot[0].css_time - snapshot[number_of_snapshots].css_time;
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if (time_diff == 0)
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DEBUGMSGTL(("ucd-snmp/vmstat_dynix.c:update_stats",
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"time_diff is ZERO... watch for the segfault\n"));
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DEBUGMSGTL(("ucd-snmp/vmstat_dynix.c:update_stats",
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"time_diff: %lld\n", time_diff));
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/*
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* swapin and swapout are in pages, MIB wants kB/s,so we just need to get kB and seconds
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*/
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/*
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* For the others we need to get value per second
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*/
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/*
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* decided to use sysconf(_SC_PAGESIZE) instead to get around an #ifndef (I don't like those)
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*/
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/*
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* LINTED cast needed, really
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*/
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swapin =
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(uint_t) ((css_new->css_swapin -
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css_old->css_swapin) * (time_t) 1000 *
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sysconf(_SC_PAGESIZE) / 1024 / time_diff);
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/*
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* LINTED cast needed, really
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*/
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swapout =
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(uint_t) ((css_new->css_swapout -
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css_old->css_swapout) * (time_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) * (time_t) 1000 /
|
|
time_diff);
|
|
/*
|
|
* LINTED cast needed, really
|
|
*/
|
|
blocks_write =
|
|
(uint_t) ((css_new->css_blocks_write -
|
|
css_old->css_blocks_write) * (time_t) 1000 /
|
|
time_diff);
|
|
/*
|
|
* LINTED cast needed, really
|
|
*/
|
|
interrupts =
|
|
(uint_t) ((css_new->css_interrupts -
|
|
css_old->css_interrupts) * (time_t) 1000 /
|
|
time_diff);
|
|
/*
|
|
* LINTED cast needed, really
|
|
*/
|
|
context_sw =
|
|
(uint_t) ((css_new->css_context_sw -
|
|
css_old->css_context_sw) * (time_t) 1000 /
|
|
time_diff);
|
|
|
|
/*
|
|
* Loop thru all the V_CPU_STATES and get the differences
|
|
*/
|
|
for (i = 0; i < V_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 < V_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 V_CPU_SYSTEM which is V_CPU_KERNEL + V_CPU_STREAM
|
|
*/
|
|
/*
|
|
* LINTED has to be 'long'
|
|
*/
|
|
cpu_perc[V_CPU_SYSTEM] =
|
|
(long) ((((css_new->css_cpu[V_CPU_KERNEL] -
|
|
css_old->css_cpu[V_CPU_KERNEL])
|
|
+ (css_new->css_cpu[V_CPU_STREAM] -
|
|
css_old->css_cpu[V_CPU_STREAM]))
|
|
* 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[V_CPU_USER]));
|
|
case CPUSYSTEM:
|
|
return ((u_char *) (&cpu_perc[V_CPU_SYSTEM]));
|
|
case CPUIDLE:
|
|
return ((u_char *) (&cpu_perc[V_CPU_IDLE]));
|
|
case CPURAWUSER:
|
|
take_snapshot(&raw_values);
|
|
/*
|
|
* LINTED has to be 'long'
|
|
*/
|
|
long_ret =
|
|
(long) (raw_values.css_cpu[V_CPU_USER] / raw_values.css_cpus);
|
|
return ((u_char *) (&long_ret));
|
|
/*
|
|
* We are missing CPURAWNICE, Dynix 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[V_CPU_KERNEL] +
|
|
raw_values.css_cpu[V_CPU_STREAM]) /
|
|
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[V_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[V_CPU_STREAM] /
|
|
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[V_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_dynix: Error in request, no match found.\n");
|
|
}
|
|
return (NULL);
|
|
} /* *var_extensible_vmstat ends here */
|
|
|
|
/*
|
|
* Functions end here
|
|
*/
|
|
|
|
/*
|
|
* Program ends here
|
|
*/
|