vmstat_dynix.c
上传用户:wxp200602
上传日期:2007-10-30
资源大小:4028k
文件大小:22k
- /*
- * vmstat_dynix.c
- * UCD SNMP module for systemStats section of UCD-SNMP-MIB for Dynix
- * Patrick Hess <phess@phess.best.vwh.net>
- *
- * This is just a port of the vmstat_solaris2 code Version 0.7
- *
- */
- /*
- * To make lint skip the debug code and stop complaining
- */
- #ifdef __lint
- #define SNMP_NO_DEBUGGING 1
- #endif
- #define __NO_ASM_MACRO 1
- /*
- * Includes start here
- */
- #include <net-snmp/net-snmp-config.h>
- /*
- * Standard includes
- */
- #include <sys/tmp_ctl.h>
- #include <sys/sysperf.h>
- #include <sys/vmmeter.h>
- #include <unistd.h>
- #include <string.h>
- #include <net-snmp/net-snmp-includes.h>
- #include <net-snmp/agent/net-snmp-agent-includes.h>
- #include "mibdefs.h"
- #include "util_funcs.h"
- /*
- * Header file for this module
- */
- #include "vmstat.h"
- #include "vmstat_dynix.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 {
- time_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[V_CPU_STATES];
- };
- /*
- * Global structures end here
- */
- /*
- * Global variables start here
- */
- /*
- * 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 V_CPU_SYSTEM, which is V_CPU_KERNEL + V_CPU_STREAM
- */
- static long cpu_perc[V_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_dynix 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_dynix(void)
- {
- /*
- * Which variables do we service ?
- */
- struct variable2 extensible_vmstat_variables[] = {
- {MIBINDEX, ASN_INTEGER, RONLY, var_extensible_vmstat, 1,
- {MIBINDEX}},
- {ERRORNAME, ASN_OCTET_STR, RONLY, var_extensible_vmstat, 1,
- {ERRORNAME}},
- {SWAPIN, ASN_INTEGER, RONLY, var_extensible_vmstat, 1, {SWAPIN}},
- {SWAPOUT, ASN_INTEGER, RONLY, var_extensible_vmstat, 1, {SWAPOUT}},
- {IOSENT, ASN_INTEGER, RONLY, var_extensible_vmstat, 1, {IOSENT}},
- {IORECEIVE, ASN_INTEGER, RONLY, var_extensible_vmstat, 1,
- {IORECEIVE}},
- {SYSINTERRUPTS, ASN_INTEGER, RONLY, var_extensible_vmstat, 1,
- {SYSINTERRUPTS}},
- {SYSCONTEXT, ASN_INTEGER, RONLY, var_extensible_vmstat, 1,
- {SYSCONTEXT}},
- {CPUUSER, ASN_INTEGER, RONLY, var_extensible_vmstat, 1, {CPUUSER}},
- {CPUSYSTEM, ASN_INTEGER, RONLY, var_extensible_vmstat, 1,
- {CPUSYSTEM}},
- {CPUIDLE, ASN_INTEGER, RONLY, var_extensible_vmstat, 1, {CPUIDLE}},
- {CPURAWUSER, ASN_COUNTER, RONLY, var_extensible_vmstat, 1,
- {CPURAWUSER}},
- {CPURAWSYSTEM, ASN_COUNTER, RONLY, var_extensible_vmstat, 1,
- {CPURAWSYSTEM}},
- {CPURAWIDLE, ASN_COUNTER, RONLY, var_extensible_vmstat, 1,
- {CPURAWIDLE}},
- {CPURAWWAIT, ASN_COUNTER, RONLY, var_extensible_vmstat, 1,
- {CPURAWWAIT}},
- {CPURAWKERNEL, ASN_COUNTER, RONLY, var_extensible_vmstat, 1,
- {CPURAWKERNEL}},
- {IORAWSENT, ASN_COUNTER, RONLY, var_extensible_vmstat, 1,
- {IORAWSENT}},
- {IORAWRECEIVE, ASN_COUNTER, RONLY, var_extensible_vmstat, 1,
- {IORAWRECEIVE}},
- /*
- * Future use:
- */
- /*
- * {ERRORFLAG, ASN_INTEGER, RONLY, var_extensible_vmstat, 1, {ERRORFLAG }},
- * {ERRORMSG, ASN_OCTET_STR, 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[] = { 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);
- /*
- * 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_dynix (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_dynix (init): snmp_alarm_register failed, cannot service requests.n");
- }
- } /* init_vmstat_dynix 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
- */
- /*
- * Counters
- */
- unsigned int cpu_num = 0;
- /*
- * Low resolution time counter
- */
- time_t current_time;
- /*
- * see sys/sysperf.h, holds CPU data
- */
- exp_vmmeter_t *cs, *origcs = 0;
- /*
- * size of the cs struct
- */
- size_t vminfo_size;
- /*
- * The usual stuff to count on, err, by
- */
- int i;
- int engnum = 0;
- /*
- * Variables end here
- */
- /*
- * Function starts here
- */
- /*
- * Get time
- */
- current_time = time(0);
- /*
- * If we have just gotten the data, return the values from last run (skip if-clause)
- */
- /*
- * This happens on a snmpwalk request.
- */
- /*
- * 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 + 2)) {
- /*
- * Make sure we clean up before we put new data into snapshot
- */
- memset(css, 0, sizeof *css);
- /*
- * Get the number of CPUs we gather data from
- */
- if ((cpu_num = tmp_ctl(TMP_NENG, 0)) < 0) {
- snmp_log(LOG_ERR,
- "vmstat_dynix: (take snapshot) bad tmp_ctl returnn");
- return (-1);
- }
- css->css_cpus = cpu_num;
- vminfo_size = cpu_num * sizeof(exp_vmmeter_t);
- if (!(cs = (exp_vmmeter_t *) malloc(vminfo_size))) {
- snmp_log(LOG_ERR,
- "vmstat_dynix: (take_snapshot) bad malloc returnn");
- return (-1);
- }
- origcs = cs;
- /*
- * Update timer
- */
- css->css_time = current_time;
- /*
- * Read data from kernel into cs structure
- */
- /*
- * cs is the buffer we are writing to and
- */
- /*
- * vminfo_size is the size of the cs struct
- */
- if ((getkerndata(VMMETER_DATAID, cs, vminfo_size)) < 0) {
- snmp_log(LOG_ERR,
- "vmstat_dynix (take_snapshot): getkerndata failure.");
- return (-1);
- }
- /*
- * Get the data from each CPU
- */
- /*
- * We walk through the whole vmmeter struct and sum up all the found stats,
- */
- /*
- * there's one for every CPU in a machine
- */
- /*
- * Okay... you can't laugh at this! I'm a C-hack, not a C-coder. :)
- */
- while (engnum < cpu_num) {
- /*
- * Get the data from the cs structure and sum it up in our own structure
- */
- css->css_swapin += (unsigned long long) cs->v_swpin;
- css->css_swapout += (unsigned long long) cs->v_swpout;
- css->css_blocks_read += (unsigned long long) cs->v_phread;
- css->css_blocks_write += (unsigned long long) cs->v_phwrite;
- css->css_interrupts += (unsigned long long) cs->v_intr;
- css->css_context_sw += (unsigned long long) cs->v_swtch;
- /*
- * We need a for-loop for the CPU STATE values
- */
- for (i = 0; i < V_CPU_STATES; i++) {
- css->css_cpu[i] += (unsigned long long) cs->v_time[i];
- } /* end for */
- cs++;
- engnum++;
- } /* end while */
- }
- free((void *) origcs);
- /*
- * 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
- */
- time_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;
- /*
- * 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_dynix.c:update_stats",
- "updating statsn"));
- /*
- * Take the current snapshot
- */
- if (take_snapshot(&snapshot[0]) == -1) {
- snmp_log(LOG_WARNING,
- "vmstat_dynix (update_stats): Something went wrong with take_snapshot.");
- 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_dynix (update_stats): Cool ! Number of CPUs increased, must be hot-pluggable.");
- } else {
- snmp_log(LOG_NOTICE,
- "vmstat_dynix (update_stats): Lost at least one CPU, RIP.");
- }
- /*
- * 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_dynix (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 seconds
- */
- time_diff =
- snapshot[0].css_time - snapshot[number_of_snapshots].css_time;
- if (time_diff == 0)
- DEBUGMSGTL(("ucd-snmp/vmstat_dynix.c:update_stats",
- "time_diff is ZERO... watch for the segfaultn"));
- DEBUGMSGTL(("ucd-snmp/vmstat_dynix.c:update_stats",
- "time_diff: %lldn", 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
- */
- /*
- * decided to use sysconf(_SC_PAGESIZE) instead to get around an #ifndef (I don't like those)
- */
- /*
- * LINTED cast needed, really
- */
- swapin =
- (uint_t) ((css_new->css_swapin -
- css_old->css_swapin) * (time_t) 1000 *
- sysconf(_SC_PAGESIZE) / 1024 / time_diff);
- /*
- * LINTED cast needed, really
- */
- swapout =
- (uint_t) ((css_new->css_swapout -
- 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
- */