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/* $OpenBSD: swap.c,v 1.7 2011/07/10 15:23:01 jasper Exp $ */
/* Copyright (C) 1998-99 Martin Baulig
This file is part of LibGTop 1.0.
Contributed by Martin Baulig <martin@home-of-linux.org>, April 1998.
LibGTop is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License,
or (at your option) any later version.
LibGTop is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with LibGTop; see the file COPYING. If not, write to the
Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include <config.h>
#include <glibtop.h>
#include <glibtop/error.h>
#include <glibtop/swap.h>
#include <glibtop_suid.h>
static const unsigned long _glibtop_sysdeps_swap =
(1L << GLIBTOP_SWAP_TOTAL) + (1L << GLIBTOP_SWAP_USED) +
(1L << GLIBTOP_SWAP_FREE) + (1L << GLIBTOP_SWAP_PAGEIN) +
(1L << GLIBTOP_SWAP_PAGEOUT);
#include <sys/vmmeter.h>
#include <uvm/uvm_extern.h>
#include <sys/swap.h>
static int mib_uvmexp [] = { CTL_VM, VM_UVMEXP };
/* Init function. */
void
_glibtop_init_swap_p (glibtop *server)
{
server->sysdeps.swap = _glibtop_sysdeps_swap;
}
/* Provides information about swap usage. */
/*
* This function is based on a program called swapinfo written
* by Kevin Lahey <kml@rokkaku.atl.ga.us>.
*/
void
glibtop_get_swap_p (glibtop *server, glibtop_swap *buf)
{
struct swapent *swaplist;
int nswap, i;
guint64 avail = 0, inuse = 0;
int blocksize = 512; /* Default blocksize, use getbize() ? */
int blockdiv = blocksize / DEV_BSIZE;
struct uvmexp uvmexp;
size_t length_uvmexp;
static int swappgsin = -1;
static int swappgsout = -1;
glibtop_init_p (server, (1L << GLIBTOP_SYSDEPS_SWAP), 0);
memset (buf, 0, sizeof (glibtop_swap));
if (server->sysdeps.swap == 0)
return;
length_uvmexp = sizeof (uvmexp);
if (sysctl (mib_uvmexp, 2, &uvmexp, &length_uvmexp, NULL, 0)) {
glibtop_warn_io_r (server, "sysctl (vm.uvmexp)");
return;
}
if (swappgsin < 0) {
buf->pagein = 0;
buf->pageout = 0;
} else {
buf->pagein = uvmexp.pgswapin - swappgsin;
buf->pageout = uvmexp.pgswapout - swappgsout;
}
swappgsin = uvmexp.pgswapin;
swappgsout = uvmexp.pgswapout;
nswap = swapctl (SWAP_NSWAP, 0, 0);
if (nswap < 0) {
glibtop_warn_io_r (server, "swapctl (SWAP_NSWAP)");
return;
}
swaplist = g_malloc (nswap * sizeof (struct swapent));
if (swapctl (SWAP_STATS, swaplist, nswap) != nswap) {
glibtop_warn_io_r (server, "swapctl (SWAP_STATS)");
g_free (swaplist);
return;
}
/* Total things up, returns in 512 bytes blocks! */
for (i = 0; i < nswap; i++) {
if (swaplist[i].se_flags & SWF_ENABLE) {
avail += (swaplist[i].se_nblks / blockdiv);
inuse += (swaplist[i].se_inuse / blockdiv);
}
}
/* Convert back to bytes, the libgtop2 is not clear about unites... */
avail *= 512;
inuse *= 512;
g_free (swaplist);
buf->flags = _glibtop_sysdeps_swap;
buf->used = inuse;
buf->free = avail;
buf->total = inuse + avail;
}
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