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freebsd-dev/libexec/rpc.rstatd/rstat_proc.c
Poul-Henning Kamp 7194d335cf Run a revision of the devstat interface: 
Kernel:

Change statistics to use the *uptime() timescale (ie: relative to
boottime) rather than the UTC aligned timescale.  This makes the
device statistics code oblivious to clock steps.

Change timestamps to bintime format, they are cheaper.

Remove the "busy_count", and replace it with two counter fields:
"start_count" and "end_count", which are updated in the down and
up paths respectively.  This removes the locking constraint on
devstat.

Add a timestamp argument to devstat_start_transaction(), this will
normally be a timestamp set by the *_bio() function in bp->bio_t0.
Use this field to calculate duration of I/O operations.

Add two timestamp arguments to devstat_end_transaction(), one is
the current time, a NULL pointer means "take timestamp yourself",
the other is the timestamp of when this transaction started (see
above).

Change calculation of busy_time to operate on "the salami principle":
Only when we are idle, which we can determine by the start+end
counts being identical, do we update the "busy_from" field in the
down path.  In the up path we accumulate the timeslice in busy_time
and update busy_from.

Change the byte_* and num_* fields into two arrays: bytes[] and
operations[].

Userland:

Change the misleading "busy_time" name to be called "snap_time" and
make the time long double since that is what most users need anyway,
fill it using clock_gettime(CLOCK_MONOTONIC) to put it on the same
timescale as the kernel fields.

Change devstat_compute_etime() to operate on struct bintime.

Remove the version 2 legacy interface: the change to bintime makes
compatibility far too expensive.

Fix a bug in systat's "vm" page where boot relative busy times would
be bogus.

Bump __FreeBSD_version to 500107

Review & Collaboration by:	ken
2003-03-15 21:59:06 +00:00

506 lines
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/*
* Sun RPC is a product of Sun Microsystems, Inc. and is provided for
* unrestricted use provided that this legend is included on all tape
* media and as a part of the software program in whole or part. Users
* may copy or modify Sun RPC without charge, but are not authorized
* to license or distribute it to anyone else except as part of a product or
* program developed by the user.
*
* SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
* WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
* PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
*
* Sun RPC is provided with no support and without any obligation on the
* part of Sun Microsystems, Inc. to assist in its use, correction,
* modification or enhancement.
*
* SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
* INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
* OR ANY PART THEREOF.
*
* In no event will Sun Microsystems, Inc. be liable for any lost revenue
* or profits or other special, indirect and consequential damages, even if
* Sun has been advised of the possibility of such damages.
*
* Sun Microsystems, Inc.
* 2550 Garcia Avenue
* Mountain View, California 94043
*/
#ifndef lint
#if 0
static char sccsid[] = "from: @(#)rpc.rstatd.c 1.1 86/09/25 Copyr 1984 Sun Micro";
static char sccsid[] = "from: @(#)rstat_proc.c 2.2 88/08/01 4.0 RPCSRC";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif
/*
* rstat service: built with rstat.x and derived from rpc.rstatd.c
*
* Copyright (c) 1984 by Sun Microsystems, Inc.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <sys/vmmeter.h>
#include <sys/param.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <kvm.h>
#include <limits.h>
#include <nlist.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <devstat.h>
#include <net/if.h>
#include <net/if_mib.h>
#undef FSHIFT /* Use protocol's shift and scale values */
#undef FSCALE
#undef if_ipackets
#undef if_ierrors
#undef if_opackets
#undef if_oerrors
#undef if_collisions
#include <rpcsvc/rstat.h>
struct nlist nl[] = {
#define X_CPTIME 0
{ "_cp_time" },
#define X_CNT 1
{ "_cnt" },
{ "" },
};
int haveadisk(void);
void updatexfers(int, int *);
void setup(void);
int stats_service(void);
extern int from_inetd;
int sincelastreq = 0; /* number of alarms since last request */
extern int closedown;
union {
struct stats s1;
struct statsswtch s2;
struct statstime s3;
} stats_all;
void updatestat();
static stat_is_init = 0;
static kvm_t *kd;
static int cp_time_xlat[RSTAT_CPUSTATES] = { CP_USER, CP_NICE, CP_SYS,
CP_IDLE };
static long bsd_cp_time[CPUSTATES];
#ifndef FSCALE
#define FSCALE (1 << 8)
#endif
void
stat_init(void)
{
stat_is_init = 1;
setup();
alarm(0);
updatestat();
(void) signal(SIGALRM, updatestat);
alarm(1);
}
statstime *
rstatproc_stats_3_svc(void *argp, struct svc_req *rqstp)
{
if (! stat_is_init)
stat_init();
sincelastreq = 0;
return(&stats_all.s3);
}
statsswtch *
rstatproc_stats_2_svc(void *argp, struct svc_req *rqstp)
{
if (! stat_is_init)
stat_init();
sincelastreq = 0;
return(&stats_all.s2);
}
stats *
rstatproc_stats_1_svc(void *argp, struct svc_req *rqstp)
{
if (! stat_is_init)
stat_init();
sincelastreq = 0;
return(&stats_all.s1);
}
u_int *
rstatproc_havedisk_3_svc(void *argp, struct svc_req *rqstp)
{
static u_int have;
if (! stat_is_init)
stat_init();
sincelastreq = 0;
have = haveadisk();
return(&have);
}
u_int *
rstatproc_havedisk_2_svc(void *argp, struct svc_req *rqstp)
{
return(rstatproc_havedisk_3_svc(argp, rqstp));
}
u_int *
rstatproc_havedisk_1_svc(void *argp, struct svc_req *rqstp)
{
return(rstatproc_havedisk_3_svc(argp, rqstp));
}
void
updatestat(void)
{
int i, hz;
struct clockinfo clockrate;
struct vmmeter cnt;
struct ifmibdata ifmd;
double avrun[3];
struct timeval tm, btm;
int mib[6];
size_t len;
int ifcount;
#ifdef DEBUG
fprintf(stderr, "entering updatestat\n");
#endif
if (sincelastreq >= closedown) {
#ifdef DEBUG
fprintf(stderr, "about to closedown\n");
#endif
kvm_close(kd);
if (from_inetd)
exit(0);
else {
stat_is_init = 0;
return;
}
}
sincelastreq++;
mib[0] = CTL_KERN;
mib[1] = KERN_CLOCKRATE;
len = sizeof clockrate;
if (sysctl(mib, 2, &clockrate, &len, 0, 0) < 0) {
syslog(LOG_ERR, "sysctl(kern.clockrate): %m");
exit(1);
}
hz = clockrate.hz;
if (kvm_read(kd, (long)nl[X_CPTIME].n_value, (char *)bsd_cp_time, sizeof(bsd_cp_time))
!= sizeof(bsd_cp_time)) {
syslog(LOG_ERR, "rstat: can't read cp_time from kmem");
exit(1);
}
for(i = 0; i < RSTAT_CPUSTATES ; i++)
stats_all.s1.cp_time[i] = bsd_cp_time[cp_time_xlat[i]];
(void)getloadavg(avrun, sizeof(avrun) / sizeof(avrun[0]));
stats_all.s2.avenrun[0] = avrun[0] * FSCALE;
stats_all.s2.avenrun[1] = avrun[1] * FSCALE;
stats_all.s2.avenrun[2] = avrun[2] * FSCALE;
mib[0] = CTL_KERN;
mib[1] = KERN_BOOTTIME;
len = sizeof btm;
if (sysctl(mib, 2, &btm, &len, 0, 0) < 0) {
syslog(LOG_ERR, "sysctl(kern.boottime): %m");
exit(1);
}
stats_all.s2.boottime.tv_sec = btm.tv_sec;
stats_all.s2.boottime.tv_usec = btm.tv_usec;
#ifdef DEBUG
fprintf(stderr, "%d %d %d %d\n", stats_all.s1.cp_time[0],
stats_all.s1.cp_time[1], stats_all.s1.cp_time[2], stats_all.s1.cp_time[3]);
#endif
/* XXX - should use sysctl */
if (kvm_read(kd, (long)nl[X_CNT].n_value, (char *)&cnt, sizeof cnt) != sizeof cnt) {
syslog(LOG_ERR, "rstat: can't read cnt from kmem");
exit(1);
}
stats_all.s1.v_pgpgin = cnt.v_vnodepgsin;
stats_all.s1.v_pgpgout = cnt.v_vnodepgsout;
stats_all.s1.v_pswpin = cnt.v_swappgsin;
stats_all.s1.v_pswpout = cnt.v_swappgsout;
stats_all.s1.v_intr = cnt.v_intr;
gettimeofday(&tm, (struct timezone *) 0);
stats_all.s1.v_intr -= hz*(tm.tv_sec - btm.tv_sec) +
hz*(tm.tv_usec - btm.tv_usec)/1000000;
stats_all.s2.v_swtch = cnt.v_swtch;
/* update disk transfers */
updatexfers(RSTAT_DK_NDRIVE, stats_all.s1.dk_xfer);
mib[0] = CTL_NET;
mib[1] = PF_LINK;
mib[2] = NETLINK_GENERIC;
mib[3] = IFMIB_SYSTEM;
mib[4] = IFMIB_IFCOUNT;
len = sizeof ifcount;
if (sysctl(mib, 5, &ifcount, &len, 0, 0) < 0) {
syslog(LOG_ERR, "sysctl(net.link.generic.system.ifcount): %m");
exit(1);
}
stats_all.s1.if_ipackets = 0;
stats_all.s1.if_opackets = 0;
stats_all.s1.if_ierrors = 0;
stats_all.s1.if_oerrors = 0;
stats_all.s1.if_collisions = 0;
for (i = 1; i <= ifcount; i++) {
len = sizeof ifmd;
mib[3] = IFMIB_IFDATA;
mib[4] = i;
mib[5] = IFDATA_GENERAL;
if (sysctl(mib, 6, &ifmd, &len, 0, 0) < 0) {
if (errno == ENOENT)
continue;
syslog(LOG_ERR, "sysctl(net.link.ifdata.%d.general)"
": %m", i);
exit(1);
}
stats_all.s1.if_ipackets += ifmd.ifmd_data.ifi_ipackets;
stats_all.s1.if_opackets += ifmd.ifmd_data.ifi_opackets;
stats_all.s1.if_ierrors += ifmd.ifmd_data.ifi_ierrors;
stats_all.s1.if_oerrors += ifmd.ifmd_data.ifi_oerrors;
stats_all.s1.if_collisions += ifmd.ifmd_data.ifi_collisions;
}
gettimeofday((struct timeval *)&stats_all.s3.curtime,
(struct timezone *) 0);
alarm(1);
}
void
setup()
{
char errbuf[_POSIX2_LINE_MAX];
int en;
if ((kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf)) == NULL) {
syslog(LOG_ERR, "rpc.rstatd, %s", errbuf);
exit(1);
}
if ((en = kvm_nlist(kd, nl)) != 0) {
syslog(LOG_ERR, "rstatd: Can't get namelist. %d", en);
exit (1);
}
}
/*
* returns true if have a disk
*/
int
haveadisk(void)
{
register int i;
struct statinfo stats;
int num_devices, retval = 0;
if ((num_devices = devstat_getnumdevs(NULL)) < 0) {
syslog(LOG_ERR, "rstatd: can't get number of devices: %s",
devstat_errbuf);
exit(1);
}
if (devstat_checkversion(NULL) < 0) {
syslog(LOG_ERR, "rstatd: %s", devstat_errbuf);
exit(1);
}
stats.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
bzero(stats.dinfo, sizeof(struct devinfo));
if (devstat_getdevs(NULL, &stats) == -1) {
syslog(LOG_ERR, "rstatd: can't get device list: %s",
devstat_errbuf);
exit(1);
}
for (i = 0; i < stats.dinfo->numdevs; i++) {
if (((stats.dinfo->devices[i].device_type
& DEVSTAT_TYPE_MASK) == DEVSTAT_TYPE_DIRECT)
&& ((stats.dinfo->devices[i].device_type
& DEVSTAT_TYPE_PASS) == 0)) {
retval = 1;
break;
}
}
if (stats.dinfo->mem_ptr)
free(stats.dinfo->mem_ptr);
free(stats.dinfo);
return(retval);
}
void
updatexfers(int numdevs, int *devs)
{
register int i, j, k, t;
struct statinfo stats;
int num_devices = 0;
u_int64_t total_transfers;
if ((num_devices = devstat_getnumdevs(NULL)) < 0) {
syslog(LOG_ERR, "rstatd: can't get number of devices: %s",
devstat_errbuf);
exit(1);
}
if (devstat_checkversion(NULL) < 0) {
syslog(LOG_ERR, "rstatd: %s", devstat_errbuf);
exit(1);
}
stats.dinfo = (struct devinfo *)malloc(sizeof(struct devinfo));
bzero(stats.dinfo, sizeof(struct devinfo));
if (devstat_getdevs(NULL, &stats) == -1) {
syslog(LOG_ERR, "rstatd: can't get device list: %s",
devstat_errbuf);
exit(1);
}
for (i = 0, j = 0; i < stats.dinfo->numdevs && j < numdevs; i++) {
if (((stats.dinfo->devices[i].device_type
& DEVSTAT_TYPE_MASK) == DEVSTAT_TYPE_DIRECT)
&& ((stats.dinfo->devices[i].device_type
& DEVSTAT_TYPE_PASS) == 0)) {
total_transfers = 0;
for (k = 0; k < DEVSTAT_N_TRANS_FLAGS; k++)
total_transfers +=
stats.dinfo->devices[i].operations[k];
/*
* XXX KDM If the total transfers for this device
* are greater than the amount we can fit in a
* signed integer, just set them to the maximum
* amount we can fit in a signed integer. I have a
* feeling that the rstat protocol assumes 32-bit
* integers, so this could well break on a 64-bit
* architecture like the Alpha.
*/
if (total_transfers > INT_MAX)
t = INT_MAX;
else
t = total_transfers;
devs[j] = t;
j++;
}
}
if (stats.dinfo->mem_ptr)
free(stats.dinfo->mem_ptr);
free(stats.dinfo);
}
void
rstat_service(struct svc_req *rqstp, SVCXPRT *transp)
{
union {
int fill;
} argument;
char *result;
bool_t (*xdr_argument)(), (*xdr_result)();
char *(*local)();
switch (rqstp->rq_proc) {
case NULLPROC:
(void)svc_sendreply(transp, (xdrproc_t)xdr_void, NULL);
goto leave;
case RSTATPROC_STATS:
xdr_argument = xdr_void;
xdr_result = xdr_statstime;
switch (rqstp->rq_vers) {
case RSTATVERS_ORIG:
local = (char *(*)()) rstatproc_stats_1_svc;
break;
case RSTATVERS_SWTCH:
local = (char *(*)()) rstatproc_stats_2_svc;
break;
case RSTATVERS_TIME:
local = (char *(*)()) rstatproc_stats_3_svc;
break;
default:
svcerr_progvers(transp, RSTATVERS_ORIG, RSTATVERS_TIME);
goto leave;
/*NOTREACHED*/
}
break;
case RSTATPROC_HAVEDISK:
xdr_argument = xdr_void;
xdr_result = xdr_u_int;
switch (rqstp->rq_vers) {
case RSTATVERS_ORIG:
local = (char *(*)()) rstatproc_havedisk_1_svc;
break;
case RSTATVERS_SWTCH:
local = (char *(*)()) rstatproc_havedisk_2_svc;
break;
case RSTATVERS_TIME:
local = (char *(*)()) rstatproc_havedisk_3_svc;
break;
default:
svcerr_progvers(transp, RSTATVERS_ORIG, RSTATVERS_TIME);
goto leave;
/*NOTREACHED*/
}
break;
default:
svcerr_noproc(transp);
goto leave;
}
bzero((char *)&argument, sizeof(argument));
if (!svc_getargs(transp, (xdrproc_t)xdr_argument, &argument)) {
svcerr_decode(transp);
goto leave;
}
result = (*local)(&argument, rqstp);
if (result != NULL &&
!svc_sendreply(transp, (xdrproc_t)xdr_result, result)) {
svcerr_systemerr(transp);
}
if (!svc_freeargs(transp, (xdrproc_t)xdr_argument, &argument))
errx(1, "unable to free arguments");
leave:
if (from_inetd)
exit(0);
}
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