115 lines
2.5 KiB
C
115 lines
2.5 KiB
C
/* $Id: get_mem.c,v 1.4 2017/02/26 16:03:48 bch Exp $
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* Adapted: get memory usage on OpenBSD
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* Author: Christian Barthel <bch@vcs.onfire.org>
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*
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* get memory usage, from get_load.c derived
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*
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* Author: Hans-Helmut Buehmann 20. Jan. 1996
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*
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* Modified for more recent kernels Helmut Geyer Oct. 1996
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*/
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#include <sys/param.h> /* DEV_BSIZE MAXCOMLEN PZERO */
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#include <sys/sysctl.h>
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#include <sys/swap.h>
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#include <sys/mount.h>
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#include <sys/proc.h>
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#include <unistd.h>
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#include <X11/Xos.h>
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#include <X11/Intrinsic.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <err.h>
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#include "MemStripChart.h"
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static int pageshift = -1;
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#define pagetok(size) ((size) << pageshift)
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#define LOG1024 10
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static double allmem_kb = 0;
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static void initPageShift(void)
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{
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int pagesize = getpagesize();
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pageshift = 0;
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while (pagesize > 1) {
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pageshift++;
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pagesize >>= 1;
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}
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pageshift -= LOG1024;
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}
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static double getSwapFrac()
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{
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struct swapent *swdev;
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int used, total, nswap, rnswap, i;
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nswap = swapctl(SWAP_NSWAP, 0, 0);
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if (nswap == 0)
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return 0;
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swdev = calloc(nswap, sizeof(*swdev));
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if (swdev == NULL)
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return 0;
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rnswap = swapctl(SWAP_STATS, swdev, nswap);
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if (rnswap == -1) {
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free(swdev);
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return 0;
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}
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/* if rnswap != nswap, then what? */
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/* Total things up */
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total = used = 0;
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for (i = 0; i < nswap; i++) {
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if (swdev[i].se_flags & SWF_ENABLE) {
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used += (swdev[i].se_inuse / (1024 / DEV_BSIZE));
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total += (swdev[i].se_nblks / (1024 / DEV_BSIZE));
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}
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}
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free(swdev);
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return (double)used/total;
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}
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void GetMemLoadPoint(Widget w, caddr_t closure, caddr_t call_data)
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{
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static int bcstats_mib[] = {CTL_VFS, VFS_GENERIC, VFS_BCACHESTAT};
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static int uvmexp_mib[] = {CTL_VM, VM_UVMEXP};
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MemStripChartCallbackData ret;
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struct uvmexp uvmexp;
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struct bcachestats bcstats;
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size_t size;
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if (pageshift < 0)
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initPageShift();
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size = sizeof(uvmexp);
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if (sysctl(uvmexp_mib, 2, &uvmexp, &size, NULL, 0) < 0) {
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warn("sysctl failed");
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bzero(&uvmexp, sizeof(uvmexp));
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}
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size = sizeof(bcstats);
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if (sysctl(bcstats_mib, 3, &bcstats, &size, NULL, 0) < 0) {
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warn("sysctl failed");
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bzero(&bcstats, sizeof(bcstats));
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}
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allmem_kb = pagetok(uvmexp.npages);
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ret.cached = pagetok(bcstats.numbufpages) / allmem_kb;
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ret.free = pagetok(uvmexp.free) / allmem_kb;
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ret.buffer = 0;
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ret.code = (1 - ret.cached - ret.free);
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ret.swap = getSwapFrac();
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#ifdef DEBUG
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printf("%lf %lf %lf %lf %lf\n", allmem_kb, ret.code, ret.cached, ret.free, ret.swap);
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#endif
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memcpy(call_data, &ret, sizeof(MemStripChartCallbackData));
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}
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