[src/trunk]: src/usr.bin/vmstat Use CPU statistics from uvmexp when possible.

[joerg <joerg%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/08b73ec84773
branches:  trunk
changeset: 796450:08b73ec84773
user:      joerg <joerg%NetBSD.org@localhost>
date:      Tue Jun 03 21:56:03 2014 +0000

description:
Use CPU statistics from uvmexp when possible.

diffstat:

 usr.bin/vmstat/vmstat.c |  30 ++++++++++++++++++++++--------
 1 files changed, 22 insertions(+), 8 deletions(-)

diffs (72 lines):

diff -r 1d1825df4220 -r 08b73ec84773 usr.bin/vmstat/vmstat.c
--- a/usr.bin/vmstat/vmstat.c   Tue Jun 03 21:45:41 2014 +0000
+++ b/usr.bin/vmstat/vmstat.c   Tue Jun 03 21:56:03 2014 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: vmstat.c,v 1.197 2014/06/03 21:45:41 joerg Exp $ */
+/* $NetBSD: vmstat.c,v 1.198 2014/06/03 21:56:03 joerg Exp $ */
 
 /*-
  * Copyright (c) 1998, 2000, 2001, 2007 The NetBSD Foundation, Inc.
@@ -70,7 +70,7 @@
 #if 0
 static char sccsid[] = "@(#)vmstat.c   8.2 (Berkeley) 3/1/95";
 #else
-__RCSID("$NetBSD: vmstat.c,v 1.197 2014/06/03 21:45:41 joerg Exp $");
+__RCSID("$NetBSD: vmstat.c,v 1.198 2014/06/03 21:56:03 joerg Exp $");
 #endif
 #endif /* not lint */
 
@@ -142,8 +142,6 @@
 # include <sys/cpu.h>
 #endif
 
-struct cpu_info **cpu_infos;
-
 /*
  * General namelist
  */
@@ -740,8 +738,6 @@
                        hz = clockinfo.hz;
        }
 
-       kread(namelist, X_CPU_INFOS, &cpu_infos, sizeof(cpu_infos));
-
        for (hdrcnt = 1;;) {
                if (!--hdrcnt)
                        printhdr();
@@ -989,7 +985,6 @@
        (void)printf("%9" PRIu64 " swap pages in use\n", uvmexp.swpginuse);
        (void)printf("%9" PRIu64 " swap allocations\n", uvmexp.nswget);
 
-       kread(namelist, X_CPU_INFOS, &cpu_infos, sizeof(cpu_infos));
        cpucounters(&cc);
 
        (void)printf("%9" PRIu64 " total faults taken\n", cc.nfault);
@@ -1149,7 +1144,26 @@
 void
 cpucounters(struct cpu_counter *cc)
 {
-       struct cpu_info **slot = cpu_infos;
+       static struct cpu_info **cpu_infos;
+       static int initialised;
+       struct cpu_info **slot;
+
+       if (memf == NULL) {
+               cc->nintr = uvmexp.intrs;
+               cc->nsyscall = uvmexp.syscalls;
+               cc->nswtch = uvmexp.swtch;
+               cc->nfault = uvmexp.faults;
+               cc->ntrap = uvmexp.traps;
+               cc->nsoft = uvmexp.softs;
+               return;
+       }
+
+       if (!initialised) {
+               kread(namelist, X_CPU_INFOS, &cpu_infos, sizeof(cpu_infos));
+               initialised = 1;
+       }
+
+       slot = cpu_infos;
 
        memset(cc, 0, sizeof(*cc));