f094d448e2
Use sysctl instead of kvm_getswapinfo() to read the swap usage information in FreeBSD. This removes the need for a dependency on libkvm and for a setgid binary. Based on the Debian patch [1]. [1] https://sources.debian.net/src/wmmemload/0.1.7-2/debian/patches/sysctl_swap.patch/
138 lines
3.3 KiB
C
138 lines
3.3 KiB
C
/*
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* mem_freebsd.c - module to get memory/swap usages in percent, for FreeBSD
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*
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* Copyright(c) 2001 Seiichi SATO <ssato@sh.rim.or.jp>
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*
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* licensed under the GPL
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "mem.h"
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#include <vm/vm_param.h>
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#include <sys/errno.h>
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#include <sys/sysctl.h>
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#include <time.h>
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/* initialize function */
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void mem_init(void)
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{
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return;
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}
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#define GETSYSCTL(name, var) getsysctl(name, &(var), sizeof(var))
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static void getsysctl(const char *name, void *ptr, size_t len)
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{
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size_t nlen = len;
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if (sysctlbyname(name, ptr, &nlen, NULL, 0) == -1) {
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fprintf(stderr, "sysctl(%s...) failed: %s\n", name,
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strerror(errno));
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exit(1);
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}
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if (nlen != len) {
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fprintf(stderr, "sysctl(%s...) expected %lu, got %lu\n",
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name, (unsigned long)len, (unsigned long)nlen);
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exit(1);
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}
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}
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/* return mem/swap usage in percent 0 to 100 */
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void mem_getusage(int *per_mem, int *per_swap, const struct mem_options *opts)
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{
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u_int mtotal, mwired, mcached, mfree, mused;
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#ifdef DEBUG
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u_int pagesize;
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#endif
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u_int new_swappgsin, new_swappgsout;
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static int swap_firsttime = 1;
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static int swappgsin = -1;
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static int swappgsout = -1;
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static int swapmax, swapused;
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time_t cur_time;
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static time_t last_time_swap;
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/* get mem usage */
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GETSYSCTL("vm.stats.vm.v_page_count", mtotal);
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GETSYSCTL("vm.stats.vm.v_wire_count", mwired);
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GETSYSCTL("vm.stats.vm.v_cache_count", mcached);
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GETSYSCTL("vm.stats.vm.v_free_count", mfree);
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#ifdef DEBUG
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GETSYSCTL("hw.pagesize", pagesize);
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#endif
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/* get swap usage */
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/* only calculate when first time or when changes took place */
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/* do not call it more than 1 time per 2 seconds */
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/* otherwise it can eat up to 50% of CPU time on heavy swap activity */
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cur_time = time(NULL);
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GETSYSCTL("vm.stats.vm.v_swappgsin", new_swappgsin);
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GETSYSCTL("vm.stats.vm.v_swappgsout", new_swappgsout);
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if (swap_firsttime ||
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(((new_swappgsin > swappgsin) || (new_swappgsout > swappgsout))
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&& cur_time > last_time_swap + 1)) {
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int mib[2], n;
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size_t mibsize, size;
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struct xswdev xsw;
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mibsize = sizeof(mib) / sizeof(mib[0]);
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if (sysctlnametomib("vm.swap_info", mib, &mibsize) == -1) {
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fprintf(stderr, "sysctlnametomib() failed: %s\n", strerror(errno));
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exit(1);
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}
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swapmax = 0;
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swapused = 0;
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for (n = 0; ; n++) {
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mib[mibsize] = n;
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size = sizeof(xsw);
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if (sysctl(mib, mibsize + 1, &xsw, &size, NULL, 0) == -1) {
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if (errno == ENOENT)
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break;
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fprintf(stderr, "sysctl() failed: %s\n", strerror(errno));
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exit(1);
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}
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swapmax += xsw.xsw_nblks;
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swapused += xsw.xsw_used;
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}
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swap_firsttime = 0;
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last_time_swap = cur_time;
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}
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swappgsin = new_swappgsin;
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swappgsout = new_swappgsout;
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#ifdef DEBUG
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printf("-------------------\n");
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printf("total:%10d\n", mtotal * pagesize);
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printf("free :%10d\n", mfree * pagesize);
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printf("wired:%10d\n", mwired * pagesize);
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printf("cache:%10d\n", mcached * pagesize);
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printf("-------------------\n");
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#endif
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/* calc mem/swap usage in percent */
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mused = mtotal - mfree;
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if (opts->ignore_wired)
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mused -= mwired;
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if (opts->ignore_cached)
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mused -= mcached;
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*per_mem = 100 * (double) mused / (double) mtotal;
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*per_swap = 100 * (double) swapused / (double) swapmax;
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if (*per_mem > 97)
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*per_mem = 100;
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}
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