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- /*
- * top - a top users display for Unix
- *
- * SYNOPSIS: For a NetBSD-1.0 (4.4BSD) system
- * Note process resident sizes could be wrong, but ps shows
- * zero for them too..
- *
- * DESCRIPTION:
- * Originally written for BSD4.4 system by Christos Zoulas.
- * Based on the FreeBSD 2.0 version by Steven Wallace && Wolfram Schneider
- * NetBSD-1.0 port by Arne Helme
- * .
- * This is the machine-dependent module for NetBSD-1.0
- * Works for:
- * NetBSD-1.0
- *
- * LIBS: -lkvm
- *
- * AUTHOR: Christos Zoulas <christos@ee.cornell.edu>
- * Steven Wallace <swallace@freebsd.org>
- * Wolfram Schneider <wosch@cs.tu-berlin.de>
- * Arne Helme <arne@acm.org>
- *
- * $Id: machine.c,v 1.5 1995/01/06 02:04:39 swallace Exp $
- */
-
-
-
- #define LASTPID /**/ /* use last pid, compiler depended */
- /* #define LASTPID_FIXED /**/
- #define VM_REAL /**/ /* use the same values as vmstat -s */
- #define USE_SWAP /**/ /* use swap usage (pstat -s),
- need to much cpu time */
- /* #define DEBUG 1 /**/
-
- #include <sys/types.h>
- #include <sys/signal.h>
- #include <sys/param.h>
-
- #include "os.h"
- #include <stdio.h>
- #include <nlist.h>
- #include <math.h>
- #include <kvm.h>
- #include <sys/errno.h>
- #include <sys/sysctl.h>
- #include <sys/dir.h>
- #include <sys/dkstat.h>
- #include <sys/file.h>
- #include <sys/time.h>
-
- #ifdef USE_SWAP
- #include <stdlib.h>
- #include <sys/map.h>
- #include <sys/conf.h>
- #endif
-
- static int check_nlist __P((struct nlist *));
- static int getkval __P((unsigned long, int *, int, char *));
- extern char* printable __P((char *));
-
- #include "top.h"
- #include "machine.h"
-
-
- /* get_process_info passes back a handle. This is what it looks like: */
-
- struct handle
- {
- struct kinfo_proc **next_proc; /* points to next valid proc pointer */
- int remaining; /* number of pointers remaining */
- };
-
- /* declarations for load_avg */
- #include "loadavg.h"
-
- #define PP(pp, field) ((pp)->kp_proc . field)
- #define EP(pp, field) ((pp)->kp_eproc . field)
- #define VP(pp, field) ((pp)->kp_eproc.e_vm . field)
-
- /* define what weighted cpu is. */
- #define weighted_cpu(pct, pp) (PP((pp), p_swtime) == 0 ? 0.0 : \
- ((pct) / (1.0 - exp(PP((pp), p_swtime) * logcpu))))
-
- /* what we consider to be process size: */
- #define PROCSIZE(pp) (VP((pp), vm_tsize) + VP((pp), vm_dsize) + VP((pp), vm_ssize))
-
- /* definitions for indices in the nlist array */
-
-
- static struct nlist nlst[] = {
- #define X_CCPU 0
- { "_ccpu" }, /* 0 */
- #define X_CP_TIME 1
- { "_cp_time" }, /* 1 */
- #define X_HZ 2
- { "_hz" }, /* 2 */
- #define X_STATHZ 3
- { "_stathz" }, /* 3 */
- #define X_AVENRUN 4
- { "_averunnable" }, /* 4 */
-
- #ifdef USE_SWAP
- #define VM_SWAPMAP 5
- { "_swapmap" }, /* list of free swap areas */
- #define VM_NSWAPMAP 6
- { "_nswapmap" },/* size of the swap map */
- #define VM_SWDEVT 7
- { "_swdevt" }, /* list of swap devices and sizes */
- #define VM_NSWAP 8
- { "_nswap" }, /* size of largest swap device */
- #define VM_NSWDEV 9
- { "_nswdev" }, /* number of swap devices */
- #define VM_DMMAX 10
- { "_dmmax" }, /* maximum size of a swap block */
- #define VM_NISWAP 11
- { "_niswap" },
- #define VM_NISWDEV 12
- { "_niswdev" },
- #endif /* USE_SWAP */
-
- #ifdef VM_REAL
- #ifdef USE_SWAP
- #define X_CNT 13
- #else
- #define X_CNT 5
- #endif
- { "_cnt" }, /* struct vmmeter cnt */
- #endif
-
- #ifdef LASTPID
- #if (defined USE_SWAP && defined VM_REAL)
- #define X_LASTPID 14
- #elif (defined VM_REAL)
- #define X_LASTPID 6
- #else
- #define X_LASTPID 5
- #endif
- #ifdef LASTPID_FIXED
- { "_nextpid" },
- #else
- { "_nextpid.178" }, /* lastpid, compiler depended
- * should be changed
- * in /sys/kern/kern_fork.c */
- #endif
- #endif
-
- { 0 }
- };
-
- /*
- * These definitions control the format of the per-process area
- */
-
- static char header[] =
- " PID X PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND";
- /* 0123456 -- field to fill in starts at header+6 */
- #define UNAME_START 6
-
- #define Proc_format \
- "%5d %-8.8s %3d %4d%7s %5s %-5s%7s %5.2f%% %5.2f%% %.14s"
-
-
- /* process state names for the "STATE" column of the display */
- /* the extra nulls in the string "run" are for adding a slash and
- the processor number when needed */
-
- char *state_abbrev[] =
- {
- "", "start", "run\0\0\0", "sleep", "stop", "zomb", "WAIT"
- };
-
-
- static kvm_t *kd;
-
- /* values that we stash away in _init and use in later routines */
-
- static double logcpu;
-
- /* these are retrieved from the kernel in _init */
-
- static long hz;
- static load_avg ccpu;
-
- /* these are offsets obtained via nlist and used in the get_ functions */
-
- static unsigned long cp_time_offset;
- static unsigned long avenrun_offset;
- #ifdef LASTPID
- static unsigned long lastpid_offset;
- static long lastpid;
- #endif
- #ifdef VM_REAL
- static unsigned long cnt_offset;
- static long cnt;
- #endif
- /* these are for calculating cpu state percentages */
-
- static long cp_time[CPUSTATES];
- static long cp_old[CPUSTATES];
- static long cp_diff[CPUSTATES];
-
- /* these are for detailing the process states */
-
- int process_states[7];
- char *procstatenames[] = {
- "", " starting, ", " running, ", " sleeping, ", " stopped, ",
- " zombie, ", " ABANDONED, ",
- NULL
- };
-
- /* these are for detailing the cpu states */
-
- int cpu_states[CPUSTATES];
- char *cpustatenames[] = {
- "user", "nice", "system", "interrupt", "idle", NULL
- };
-
- /* these are for detailing the memory statistics */
-
- int memory_stats[8];
- char *memorynames[] = {
- #ifndef VM_REAL
- "Real: ", "K/", "K ", "Virt: ", "K/",
- "K ", "Free: ", "K", NULL
- #else
- #if 0
- "K Act ", "K Inact ", "K Wired ", "K Free ", "% Swap, ",
- "K/", "K SWIO",
- #else
- "K Act ", "K Inact ", "K Wired ", "K Free ", "% Swap, ",
- "Kin ", "Kout",
- #endif
- NULL
- #endif
- };
-
- /* these are for keeping track of the proc array */
-
- static int nproc;
- static int onproc = -1;
- static int pref_len;
- static struct kinfo_proc *pbase;
- static struct kinfo_proc **pref;
-
- /* these are for getting the memory statistics */
-
- static int pageshift; /* log base 2 of the pagesize */
-
- /* define pagetok in terms of pageshift */
-
- #define pagetok(size) ((size) << pageshift)
-
- /* useful externals */
- long percentages();
-
- int
- machine_init(statics)
-
- struct statics *statics;
-
- {
- register int i = 0;
- register int pagesize;
-
- if ((kd = kvm_open(NULL, NULL, NULL, O_RDONLY, "kvm_open")) == NULL)
- return -1;
-
-
- /* get the list of symbols we want to access in the kernel */
- (void) kvm_nlist(kd, nlst);
- if (nlst[0].n_type == 0)
- {
- fprintf(stderr, "top: nlist failed\n");
- return(-1);
- }
-
- /* make sure they were all found */
- if (i > 0 && check_nlist(nlst) > 0)
- {
- return(-1);
- }
-
- /* get the symbol values out of kmem */
- (void) getkval(nlst[X_STATHZ].n_value, (int *)(&hz), sizeof(hz), "!");
- if (!hz) {
- (void) getkval(nlst[X_HZ].n_value, (int *)(&hz), sizeof(hz),
- nlst[X_HZ].n_name);
- }
-
-
- #if (defined DEBUG)
- fprintf(stderr, "Hertz: %d\n", hz);
- #endif
-
- (void) getkval(nlst[X_CCPU].n_value, (int *)(&ccpu), sizeof(ccpu),
- nlst[X_CCPU].n_name);
-
- /* stash away certain offsets for later use */
- cp_time_offset = nlst[X_CP_TIME].n_value;
- avenrun_offset = nlst[X_AVENRUN].n_value;
- #ifdef LASTPID
- lastpid_offset = nlst[X_LASTPID].n_value;
- #endif
- #ifdef VM_REAL
- cnt_offset = nlst[X_CNT].n_value;
- #endif
-
- /* this is used in calculating WCPU -- calculate it ahead of time */
- logcpu = log(loaddouble(ccpu));
-
- pbase = NULL;
- pref = NULL;
- nproc = 0;
- onproc = -1;
- /* get the page size with "getpagesize" and calculate pageshift from it */
- pagesize = getpagesize();
- pageshift = 0;
- while (pagesize > 1)
- {
- pageshift++;
- pagesize >>= 1;
- }
-
- /* we only need the amount of log(2)1024 for our conversion */
- pageshift -= LOG1024;
-
- /* fill in the statics information */
- statics->procstate_names = procstatenames;
- statics->cpustate_names = cpustatenames;
- statics->memory_names = memorynames;
-
- /* all done! */
- return(0);
- }
-
- char *format_header(uname_field)
-
- register char *uname_field;
-
- {
- register char *ptr;
-
- ptr = header + UNAME_START;
- while (*uname_field != '\0')
- {
- *ptr++ = *uname_field++;
- }
-
- return(header);
- }
-
- static int swappgsin = -1;
- static int swappgsout = -1;
- extern struct timeval timeout;
-
- void
- get_system_info(si)
-
- struct system_info *si;
-
- {
- long total;
- load_avg avenrun[3];
-
- /* get the cp_time array */
- (void) getkval(cp_time_offset, (int *)cp_time, sizeof(cp_time),
- nlst[X_CP_TIME].n_name);
- (void) getkval(avenrun_offset, (int *)avenrun, sizeof(avenrun),
- nlst[X_AVENRUN].n_name);
-
- #ifdef LASTPID
- (void) getkval(lastpid_offset, (int *)(&lastpid), sizeof(lastpid),
- "!");
- #endif
-
- /* convert load averages to doubles */
- {
- register int i;
- register double *infoloadp;
- load_avg *avenrunp;
-
- #ifdef notyet
- struct loadavg sysload;
- int size;
- getkerninfo(KINFO_LOADAVG, &sysload, &size, 0);
- #endif
-
- infoloadp = si->load_avg;
- avenrunp = avenrun;
- for (i = 0; i < 3; i++)
- {
- #ifdef notyet
- *infoloadp++ = ((double) sysload.ldavg[i]) / sysload.fscale;
- #endif
- *infoloadp++ = loaddouble(*avenrunp++);
- }
- }
-
- /* convert cp_time counts to percentages */
- total = percentages(CPUSTATES, cpu_states, cp_time, cp_old, cp_diff);
-
- /* sum memory statistics */
- {
-
- #ifndef VM_REAL
- struct vmtotal total;
- int size = sizeof(total);
- static int mib[] = { CTL_VM, VM_METER };
-
- /* get total -- systemwide main memory usage structure */
- if (sysctl(mib, 2, &total, &size, NULL, 0) < 0) {
- (void) fprintf(stderr, "top: sysctl failed: %s\n", strerror(errno));
- bzero(&total, sizeof(total));
- }
- /* convert memory stats to Kbytes */
- memory_stats[0] = -1;
- memory_stats[1] = pagetok(total.t_arm);
- memory_stats[2] = pagetok(total.t_rm);
- memory_stats[3] = -1;
- memory_stats[4] = pagetok(total.t_avm);
- memory_stats[5] = pagetok(total.t_vm);
- memory_stats[6] = -1;
- memory_stats[7] = pagetok(total.t_free);
- }
- #else
- struct vmmeter sum;
- static unsigned int swap_delay = 0;
-
- (void) getkval(cnt_offset, (int *)(&sum), sizeof(sum),
- "_cnt");
-
- /* convert memory stats to Kbytes */
- memory_stats[0] = pagetok(sum.v_active_count);
- memory_stats[1] = pagetok(sum.v_inactive_count);
- memory_stats[2] = pagetok(sum.v_wire_count);
- memory_stats[3] = pagetok(sum.v_free_count);
-
- if (swappgsin < 0) {
- memory_stats[5] = 0;
- memory_stats[6] = 0;
- } else {
- memory_stats[5] = pagetok(((sum.v_pswpin - swappgsin)));
- memory_stats[6] = pagetok(((sum.v_pswpout - swappgsout)));
- }
- swappgsin = sum.v_pswpin;
- swappgsout = sum.v_pswpout;
-
- #ifdef USE_SWAP
- if ((memory_stats[5] > 0 || memory_stats[6]) > 0 || swap_delay == 0) {
- memory_stats[4] = swapmode();
- }
- /* swap_delay++; XXX Arne */
- #else
- memory_stats[4] = 0;
- #endif
-
-
- memory_stats[7] = -1;
- }
- #endif
- /* set arrays and strings */
- si->cpustates = cpu_states;
- si->memory = memory_stats;
- #ifdef LASTPID
- if(lastpid > 0) {
- si->last_pid = lastpid;
- } else {
- si->last_pid = -1;
- }
- #else
- si->last_pid = -1;
- #endif
-
- }
-
- static struct handle handle;
-
- caddr_t get_process_info(si, sel, compare)
-
- struct system_info *si;
- struct process_select *sel;
- int (*compare)();
-
- {
- register int i;
- register int total_procs;
- register int active_procs;
- register struct kinfo_proc **prefp;
- register struct kinfo_proc *pp;
-
- /* these are copied out of sel for speed */
- int show_idle;
- int show_system;
- int show_uid;
- int show_command;
-
-
- pbase = kvm_getprocs(kd, KERN_PROC_ALL, 0, &nproc);
- if (nproc > onproc)
- pref = (struct kinfo_proc **) realloc(pref, sizeof(struct kinfo_proc *)
- * (onproc = nproc));
- if (pref == NULL || pbase == NULL) {
- (void) fprintf(stderr, "top: Out of memory.\n");
- quit(23);
- }
- /* get a pointer to the states summary array */
- si->procstates = process_states;
-
- /* set up flags which define what we are going to select */
- show_idle = sel->idle;
- show_system = sel->system;
- show_uid = sel->uid != -1;
- show_command = sel->command != NULL;
-
- /* count up process states and get pointers to interesting procs */
- total_procs = 0;
- active_procs = 0;
- memset((char *)process_states, 0, sizeof(process_states));
- prefp = pref;
- for (pp = pbase, i = 0; i < nproc; pp++, i++)
- {
- /*
- * Place pointers to each valid proc structure in pref[].
- * Process slots that are actually in use have a non-zero
- * status field. Processes with P_SYSTEM set are system
- * processes---these get ignored unless show_sysprocs is set.
- */
- if (PP(pp, p_stat) != 0 &&
- (show_system || ((PP(pp, p_flag) & P_SYSTEM) == 0)))
- {
- total_procs++;
- process_states[(unsigned char) PP(pp, p_stat)]++;
- if ((PP(pp, p_stat) != SZOMB) &&
- (show_idle || (PP(pp, p_pctcpu) != 0) ||
- (PP(pp, p_stat) == SRUN)) &&
- (!show_uid || EP(pp, e_pcred.p_ruid) == (uid_t)sel->uid))
- {
- *prefp++ = pp;
- active_procs++;
- }
- }
- }
-
- /* if requested, sort the "interesting" processes */
- if (compare != NULL)
- {
- qsort((char *)pref, active_procs, sizeof(struct kinfo_proc *), compare);
- }
-
- /* remember active and total counts */
- si->p_total = total_procs;
- si->p_active = pref_len = active_procs;
-
- /* pass back a handle */
- handle.next_proc = pref;
- handle.remaining = active_procs;
- return((caddr_t)&handle);
- }
-
- char fmt[128]; /* static area where result is built */
-
- char *format_next_process(handle, get_userid)
-
- caddr_t handle;
- char *(*get_userid)();
-
- {
- register struct kinfo_proc *pp;
- register long cputime;
- register double pct;
- struct handle *hp;
-
- /* find and remember the next proc structure */
- hp = (struct handle *)handle;
- pp = *(hp->next_proc++);
- hp->remaining--;
-
-
- /* get the process's user struct and set cputime */
- if ((PP(pp, p_flag) & P_INMEM) == 0) {
- /*
- * Print swapped processes as <pname>
- */
- char *comm = PP(pp, p_comm);
- #define COMSIZ sizeof(PP(pp, p_comm))
- char buf[COMSIZ];
- (void) strncpy(buf, comm, COMSIZ);
- comm[0] = '<';
- (void) strncpy(&comm[1], buf, COMSIZ - 2);
- comm[COMSIZ - 2] = '\0';
- (void) strncat(comm, ">", COMSIZ - 1);
- comm[COMSIZ - 1] = '\0';
- }
-
- #if 0
- /* This does not produce the correct results */
- cputime = PP(pp, p_uticks) + PP(pp, p_sticks) + PP(pp, p_iticks);
- #endif
- cputime = PP(pp, p_rtime).tv_sec; /* This does not count interrupts */
-
- /* calculate the base for cpu percentages */
- pct = pctdouble(PP(pp, p_pctcpu));
-
- /* format this entry */
- sprintf(fmt,
- Proc_format,
- PP(pp, p_pid),
- (*get_userid)(EP(pp, e_pcred.p_ruid)),
- PP(pp, p_priority) - PZERO,
- PP(pp, p_nice) - NZERO,
- format_k(pagetok(PROCSIZE(pp))),
- format_k(pagetok(VP(pp, vm_rssize))),
- state_abbrev[(unsigned char) PP(pp, p_stat)],
- format_time(cputime),
- 10000.0 * weighted_cpu(pct, pp) / hz,
- 10000.0 * pct / hz,
- printable(PP(pp, p_comm)));
-
- /* return the result */
- return(fmt);
- }
-
-
- /*
- * check_nlist(nlst) - checks the nlist to see if any symbols were not
- * found. For every symbol that was not found, a one-line
- * message is printed to stderr. The routine returns the
- * number of symbols NOT found.
- */
-
- static int check_nlist(nlst)
-
- register struct nlist *nlst;
-
- {
- register int i;
-
- /* check to see if we got ALL the symbols we requested */
- /* this will write one line to stderr for every symbol not found */
-
- i = 0;
- while (nlst->n_name != NULL)
- {
- if (nlst->n_type == 0)
- {
- /* this one wasn't found */
- (void) fprintf(stderr, "kernel: no symbol named `%s'\n",
- nlst->n_name);
- i = 1;
- }
- nlst++;
- }
-
- return(i);
- }
-
-
- /*
- * getkval(offset, ptr, size, refstr) - get a value out of the kernel.
- * "offset" is the byte offset into the kernel for the desired value,
- * "ptr" points to a buffer into which the value is retrieved,
- * "size" is the size of the buffer (and the object to retrieve),
- * "refstr" is a reference string used when printing error meessages,
- * if "refstr" starts with a '!', then a failure on read will not
- * be fatal (this may seem like a silly way to do things, but I
- * really didn't want the overhead of another argument).
- *
- */
-
- static int getkval(offset, ptr, size, refstr)
-
- unsigned long offset;
- int *ptr;
- int size;
- char *refstr;
-
- {
- if (kvm_read(kd, offset, (char *) ptr, size) != size)
- {
- if (*refstr == '!')
- {
- return(0);
- }
- else
- {
- fprintf(stderr, "top: kvm_read for %s: %s\n",
- refstr, strerror(errno));
- quit(23);
- }
- }
- return(1);
- }
-
- /* comparison routine for qsort */
-
- /*
- * proc_compare - comparison function for "qsort"
- * Compares the resource consumption of two processes using five
- * distinct keys. The keys (in descending order of importance) are:
- * percent cpu, cpu ticks, state, resident set size, total virtual
- * memory usage. The process states are ordered as follows (from least
- * to most important): WAIT, zombie, sleep, stop, start, run. The
- * array declaration below maps a process state index into a number
- * that reflects this ordering.
- */
-
- static unsigned char sorted_state[] =
- {
- 0, /* not used */
- 3, /* sleep */
- 1, /* ABANDONED (WAIT) */
- 6, /* run */
- 5, /* start */
- 2, /* zombie */
- 4 /* stop */
- };
-
- int
- proc_compare(pp1, pp2)
-
- struct proc **pp1;
- struct proc **pp2;
-
- {
- register struct kinfo_proc *p1;
- register struct kinfo_proc *p2;
- register int result;
- register pctcpu lresult;
-
- /* remove one level of indirection */
- p1 = *(struct kinfo_proc **) pp1;
- p2 = *(struct kinfo_proc **) pp2;
-
- /* compare percent cpu (pctcpu) */
- if ((lresult = PP(p2, p_pctcpu) - PP(p1, p_pctcpu)) == 0)
- {
- /* use cpticks to break the tie */
- if ((result = PP(p2, p_cpticks) - PP(p1, p_cpticks)) == 0)
- {
- /* use process state to break the tie */
- if ((result = sorted_state[(unsigned char) PP(p2, p_stat)] -
- sorted_state[(unsigned char) PP(p1, p_stat)]) == 0)
- {
- /* use priority to break the tie */
- if ((result = PP(p2, p_priority) - PP(p1, p_priority)) == 0)
- {
- /* use resident set size (rssize) to break the tie */
- if ((result = VP(p2, vm_rssize) - VP(p1, vm_rssize)) == 0)
- {
- /* use total memory to break the tie */
- result = PROCSIZE(p2) - PROCSIZE(p1);
- }
- }
- }
- }
- }
- else
- {
- result = lresult < 0 ? -1 : 1;
- }
-
- return(result);
- }
-
-
- /*
- * proc_owner(pid) - returns the uid that owns process "pid", or -1 if
- * the process does not exist.
- * It is EXTREMLY IMPORTANT that this function work correctly.
- * If top runs setuid root (as in SVR4), then this function
- * is the only thing that stands in the way of a serious
- * security problem. It validates requests for the "kill"
- * and "renice" commands.
- */
-
- int proc_owner(pid)
-
- int pid;
-
- {
- register int cnt;
- register struct kinfo_proc **prefp;
- register struct kinfo_proc *pp;
-
- prefp = pref;
- cnt = pref_len;
- while (--cnt >= 0)
- {
- pp = *prefp++;
- if (PP(pp, p_pid) == (pid_t)pid)
- {
- return((int)EP(pp, e_pcred.p_ruid));
- }
- }
- return(-1);
- }
-
-
- #ifdef USE_SWAP
- /*
- * swapmode is based on a program called swapinfo written
- * by Kevin Lahey <kml@rokkaku.atl.ga.us>.
- */
-
- #define SVAR(var) __STRING(var) /* to force expansion */
- #define KGET(idx, var) \
- KGET1(idx, &var, sizeof(var), SVAR(var))
- #define KGET1(idx, p, s, msg) \
- KGET2(nlst[idx].n_value, p, s, msg)
- #define KGET2(addr, p, s, msg) \
- if (kvm_read(kd, (u_long)(addr), p, s) != s) \
- warnx("cannot read %s: %s", msg, kvm_geterr(kd))
- #define KGETRET(addr, p, s, msg) \
- if (kvm_read(kd, (u_long)(addr), p, s) != s) { \
- warnx("cannot read %s: %s", msg, kvm_geterr(kd)); \
- return (0); \
- }
-
- int
- swapmode()
- {
- char *header;
- int hlen, nswap, nswdev, dmmax, nswapmap, niswap, niswdev;
- int s, e, div, i, l, avail, nfree, npfree, used;
- struct swdevt *sw;
- long blocksize, *perdev;
- struct map *swapmap, *kswapmap;
- struct mapent *mp, *freemp;
-
- KGET(VM_NSWAP, nswap);
- KGET(VM_NSWDEV, nswdev);
- KGET(VM_DMMAX, dmmax);
- KGET(VM_NSWAPMAP, nswapmap);
- KGET(VM_SWAPMAP, kswapmap); /* kernel `swapmap' is a pointer */
- if ((sw = malloc(nswdev * sizeof(*sw))) == NULL ||
- (perdev = malloc(nswdev * sizeof(*perdev))) == NULL ||
- (freemp = mp = malloc(nswapmap * sizeof(*mp))) == NULL)
- err(1, "malloc");
- KGET1(VM_SWDEVT, sw, nswdev * sizeof(*sw), "swdevt");
- KGET2((long)kswapmap, mp, nswapmap * sizeof(*mp), "swapmap");
-
- /* Supports sequential swap */
- if (nlst[VM_NISWAP].n_value != 0) {
- KGET(VM_NISWAP, niswap);
- KGET(VM_NISWDEV, niswdev);
- } else {
- niswap = nswap;
- niswdev = nswdev;
- }
-
- /* First entry in map is `struct map'; rest are mapent's. */
- swapmap = (struct map *)mp;
- if (nswapmap != swapmap->m_limit - (struct mapent *)kswapmap)
- errx(1, "panic: nswapmap goof");
-
- /* Count up swap space. */
- nfree = 0;
- memset(perdev, 0, nswdev * sizeof(*perdev));
- for (mp++; mp->m_addr != 0; mp++) {
- s = mp->m_addr; /* start of swap region */
- e = mp->m_addr + mp->m_size; /* end of region */
- nfree += mp->m_size;
-
- /*
- * Swap space is split up among the configured disks.
- *
- * For interleaved swap devices, the first dmmax blocks
- * of swap space some from the first disk, the next dmmax
- * blocks from the next, and so on up to niswap blocks.
- *
- * Sequential swap devices follow the interleaved devices
- * (i.e. blocks starting at niswap) in the order in which
- * they appear in the swdev table. The size of each device
- * will be a multiple of dmmax.
- *
- * The list of free space joins adjacent free blocks,
- * ignoring device boundries. If we want to keep track
- * of this information per device, we'll just have to
- * extract it ourselves. We know that dmmax-sized chunks
- * cannot span device boundaries (interleaved or sequential)
- * so we loop over such chunks assigning them to devices.
- */
- i = -1;
- while (s < e) { /* XXX this is inefficient */
- int bound = roundup(s+1, dmmax);
-
- if (bound > e)
- bound = e;
- if (bound <= niswap) {
- /* Interleaved swap chunk. */
- if (i == -1)
- i = (s / dmmax) % niswdev;
- perdev[i] += bound - s;
- if (++i >= niswdev)
- i = 0;
- } else {
- /* Sequential swap chunk. */
- if (i < niswdev) {
- i = niswdev;
- l = niswap + sw[i].sw_nblks;
- }
- while (s >= l) {
- /* XXX don't die on bogus blocks */
- if (i == nswdev-1)
- break;
- l += sw[++i].sw_nblks;
- }
- perdev[i] += bound - s;
- }
- s = bound;
- }
- }
-
- header = getbsize(&hlen, &blocksize);
- div = blocksize / 512;
- avail = npfree = 0;
- for (i = 0; i < nswdev; i++) {
- int xsize, xfree;
-
- xsize = sw[i].sw_nblks;
- xfree = perdev[i];
- used = xsize - xfree;
- npfree++;
- avail += xsize;
- }
-
- /*
- * If only one partition has been set up via swapon(8), we don't
- * need to bother with totals.
- */
- used = avail - nfree;
- free (sw); free (freemp); free (perdev);
- return (int)(((double)used / (double)avail * 100.0) + 0.5);
- }
-
-
- #endif
-
-