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Don't malloc/free the swap pointer with each refresh! Do it only if the

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number of swap devices change. Now (and with the kvm fixes) top does not
allocate/free memory on each refresh.
This commit is contained in:
christos 2006-02-16 20:50:57 +00:00
parent 0213791d0c
commit 10416487f0
1 changed files with 15 additions and 24 deletions
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39
usr.bin/top/machine/m_netbsd15.c
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@ -1,4 +1,4 @@
/* $NetBSD: m_netbsd15.c,v 1.24 2005/10/03 05:34:51 christos Exp $ */
/* $NetBSD: m_netbsd15.c,v 1.25 2006/02/16 20:50:57 christos Exp $ */
/*
* top - a top users display for Unix
@ -36,12 +36,12 @@
* Tomas Svensson <ts@unix1.net>
*
*
* $Id: m_netbsd15.c,v 1.24 2005/10/03 05:34:51 christos Exp $
* $Id: m_netbsd15.c,v 1.25 2006/02/16 20:50:57 christos Exp $
*/
#include <sys/cdefs.h>
#ifndef lint
__RCSID("$NetBSD: m_netbsd15.c,v 1.24 2005/10/03 05:34:51 christos Exp $");
__RCSID("$NetBSD: m_netbsd15.c,v 1.25 2006/02/16 20:50:57 christos Exp $");
#endif
#include <sys/param.h>
@ -195,6 +195,8 @@ static int onproc = -1;
static int pref_len;
static struct kinfo_proc2 *pbase;
static struct kinfo_proc2 **pref;
static int maxswap;
static void *swapp;
/* these are for getting the memory statistics */
@ -338,7 +340,7 @@ get_system_info(si)
size_t ssize;
int mib[2];
struct uvmexp_sysctl uvmexp;
struct swapent *sep, *seporig;
struct swapent *sep;
struct timeval boottime;
u_int64_t totalsize, totalinuse;
time_t now;
@ -388,18 +390,19 @@ get_system_info(si)
swap_stats[0] = swap_stats[1] = swap_stats[2] = 0;
seporig = NULL;
do {
nswap = swapctl(SWAP_NSWAP, 0, 0);
if (nswap < 1)
break;
/* Use seporig to keep track of the malloc'd memory
* base, as sep will be incremented in the for loop
* below.
*/
seporig = sep = (struct swapent *)malloc(nswap * sizeof(*sep));
if (sep == NULL)
break;
if (nswap > maxswap) {
if (swapp)
free(swapp);
swapp = sep = malloc(nswap * sizeof(*sep));
if (sep == NULL)
break;
maxswap = nswap;
} else
sep = swapp;
rnswap = swapctl(SWAP_STATS, (void *)sep, nswap);
if (nswap != rnswap)
break;
@ -415,19 +418,7 @@ get_system_info(si)
swap_stats[0] = dbtob(totalsize) / 1024;
swap_stats[1] = dbtob(totalinuse) / 1024;
swap_stats[2] = dbtob(totalsize) / 1024 - swap_stats[1];
/* Free here, before we malloc again in the next
* iteration of this loop.
*/
if (seporig) {
free(seporig);
seporig = NULL;
}
} while (0);
/* Catch the case where we malloc'd, but then exited the
* loop due to nswap != rnswap.
*/
if (seporig)
free(seporig);
memory_stats[6] = -1;
swap_stats[3] = -1;