Use kvm_getcptime(3) to fetch the global CPU time stats from a crashdump

since the 'cp_time' symbol doesn't exist in recent kernels.  This fixes
iostat and vmstat on crash dumps.

MFC after:	1 week

2 files changed, 28 insertions, 23 deletions

diff --git a/usr.bin/vmstat/vmstat.c b/usr.bin/vmstat/vmstat.c
index 3b5c5e3..44b199ab 100644
--- a/usr.bin/vmstat/vmstat.c
+++ b/usr.bin/vmstat/vmstat.c
@@ -81,29 +81,27 @@ __FBSDID("$FreeBSD$");
 static char da[] = "da";
 
 static struct nlist namelist[] = {
-#define	X_CPTIME	0
-	{ "_cp_time" },
-#define X_SUM		1
+#define X_SUM		0
 	{ "_cnt" },
-#define	X_BOOTTIME	2
+#define	X_BOOTTIME	1
 	{ "_boottime" },
-#define X_HZ		3
+#define X_HZ		2
 	{ "_hz" },
-#define X_STATHZ	4
+#define X_STATHZ	3
 	{ "_stathz" },
-#define X_NCHSTATS	5
+#define X_NCHSTATS	4
 	{ "_nchstats" },
-#define	X_INTRNAMES	6
+#define	X_INTRNAMES	5
 	{ "_intrnames" },
-#define	X_EINTRNAMES	7
+#define	X_EINTRNAMES	6
 	{ "_eintrnames" },
-#define	X_INTRCNT	8
+#define	X_INTRCNT	7
 	{ "_intrcnt" },
-#define	X_EINTRCNT	9
+#define	X_EINTRCNT	8
 	{ "_eintrcnt" },
-#define	X_KMEMSTATS	10
+#define	X_KMEMSTATS	9
 	{ "_kmemstatistics" },
-#define	X_KMEMZONES	11
+#define	X_KMEMZONES	10
 	{ "_kmemzones" },
 #ifdef notyet
 #define	X_DEFICIT	XXX
@@ -116,7 +114,7 @@ static struct nlist namelist[] = {
 	{ "_xstats" },
 #define X_END		XXX
 #else
-#define X_END		12
+#define X_END		11
 #endif
 	{ "" },
 };
@@ -610,7 +608,8 @@ dovmstat(unsigned int interval, int reps)
 		if (!--hdrcnt)
 			printhdr(ncpus, cpumask);
 		if (kd != NULL) {
-			kread(X_CPTIME, cur.cp_time, sizeof(cur.cp_time));
+			if (kvm_getcptime(kd, cur.cp_time) < 0)
+				errx(1, "kvm_getcptime: %s", kvm_geterr(kd));
 		} else {
 			size = sizeof(cur.cp_time);
 			mysysctl("kern.cp_time", &cur.cp_time, &size, NULL, 0);
diff --git a/usr.sbin/iostat/iostat.c b/usr.sbin/iostat/iostat.c
index b349cd2..d8e0bf4 100644
--- a/usr.sbin/iostat/iostat.c
+++ b/usr.sbin/iostat/iostat.c
@@ -124,11 +124,9 @@ struct nlist namelist[] = {
 	{ "_tk_nin" },
 #define X_TK_NOUT	1
 	{ "_tk_nout" },
-#define X_CP_TIME	2
-	{ "_cp_time" },
-#define X_BOOTTIME	3
+#define X_BOOTTIME	2
 	{ "_boottime" },
-#define X_END		3
+#define X_END		2
 	{ NULL },
 };
 
@@ -463,11 +461,19 @@ main(int argc, char **argv)
 		 }
 
 		if (Cflag > 0) {
-			if (readvar(kd, "kern.cp_time", X_CP_TIME,
-			    &cur.cp_time, sizeof(cur.cp_time)) != 0) {
-				Cflag = 0;
-				warnx("disabling CPU time statistics");
+			if (kd == NULL) {
+				if (readvar(kd, "kern.cp_time", 0,
+				    &cur.cp_time, sizeof(cur.cp_time)) != 0)
+					Cflag = 0;
+			} else {
+				if (kvm_getcptime(kd, cur.cp_time) < 0) {
+					warnx("kvm_getcptime: %s",
+					    kvm_geterr(kd));
+					Cflag = 0;
+				}
 			}
+			if (Cflag == 0)
+				warnx("disabling CPU time statistics");
 		}
 
 		if (!--headercount) {