[src/netbsd-9]: src/usr.bin/vmstat Pull up following revision(s) (requested b...

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

details:   https://anonhg.NetBSD.org/src/rev/d6f36f037891
branches:  netbsd-9
changeset: 947569:d6f36f037891
user:      martin <martin%NetBSD.org@localhost>
date:      Fri Dec 18 12:23:16 2020 +0000

description:
Pull up following revision(s) (requested by mrg in ticket #1153):

        usr.bin/vmstat/vmstat.c: revision 1.232 (patch)

move the time nlist fetches into their own namelist and only
fetch them when necessary.  allow for fallback uses of older
time sources if others are not present.

this stops vmstat from exiting if it can't get the addresses
of these time values it often doesn't need (eg, running kernels
use the sysctl method), which has cropped up recently wit the
removal of boottime variable.

a slighly modified version of this patch (modified to handle
the old boottime variable over the new one) works against a
netbsd-9 vmstat in -current too.
XXX: pullup

diffstat:

 usr.bin/vmstat/vmstat.c |  63 ++++++++++++++++++++++++++++--------------------
 1 files changed, 37 insertions(+), 26 deletions(-)

diffs (116 lines):

diff -r 53ac4148cfca -r d6f36f037891 usr.bin/vmstat/vmstat.c
--- a/usr.bin/vmstat/vmstat.c   Mon Dec 14 17:30:35 2020 +0000
+++ b/usr.bin/vmstat/vmstat.c   Fri Dec 18 12:23:16 2020 +0000
@@ -1,4 +1,4 @@
-/* $NetBSD: vmstat.c,v 1.227 2019/05/09 08:01:07 mrg Exp $ */
+/* $NetBSD: vmstat.c,v 1.227.2.1 2020/12/18 12:23:16 martin 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 1.227 2019/05/09 08:01:07 mrg Exp $");
+__RCSID("$NetBSD: vmstat.c,v 1.227.2.1 2020/12/18 12:23:16 martin Exp $");
 #endif
 #endif /* not lint */
 
@@ -147,27 +147,36 @@
  */
 struct nlist namelist[] =
 {
+#define        X_HZ            0
+       { .n_name = "_hz" },
+#define        X_STATHZ        1
+       { .n_name = "_stathz" },
+#define        X_NCHSTATS      2
+       { .n_name = "_nchstats" },
+#define        X_ALLEVENTS     3
+       { .n_name = "_allevents" },
+#define        X_POOLHEAD      4
+       { .n_name = "_pool_head" },
+#define        X_UVMEXP        5
+       { .n_name = "_uvmexp" },
+#define X_CPU_INFOS    6
+       { .n_name = "_cpu_infos" },
+#define        X_NL_SIZE       7
+       { .n_name = NULL },
+};
+
+/*
+ * Namelist for time data.
+ */
+struct nlist timenl[] =
+{
 #define        X_BOOTTIME      0
        { .n_name = "_boottime" },
-#define        X_HZ            1
-       { .n_name = "_hz" },
-#define        X_STATHZ        2
-       { .n_name = "_stathz" },
-#define        X_NCHSTATS      3
-       { .n_name = "_nchstats" },
-#define        X_ALLEVENTS     4
-       { .n_name = "_allevents" },
-#define        X_POOLHEAD      5
-       { .n_name = "_pool_head" },
-#define        X_UVMEXP        6
-       { .n_name = "_uvmexp" },
-#define        X_TIME_SECOND   7
+#define        X_TIME_SECOND   1
        { .n_name = "_time_second" },
-#define X_TIME         8
+#define X_TIME         2
        { .n_name = "_time" },
-#define X_CPU_INFOS    9
-       { .n_name = "_cpu_infos" },
-#define        X_NL_SIZE       10
+#define        X_TIMENL_SIZE   3
        { .n_name = NULL },
 };
 
@@ -552,9 +561,7 @@
                                errx(1, "kvm_nlist: %s %s",
                                    "namelist", kvm_geterr(kd));
                        for (i = 0; i < __arraycount(namelist)-1; i++)
-                               if (namelist[i].n_type == 0 &&
-                                   i != X_TIME_SECOND &&
-                                   i != X_TIME) {
+                               if (namelist[i].n_type == 0) {
                                        if (doexit++ == 0)
                                                (void)fprintf(stderr,
                                                    "%s: undefined symbols:",
@@ -568,6 +575,11 @@
                        }
                }
        }
+       if ((todo & (VMSTAT|INTRSTAT)) && !(done & (VMSTAT))) {
+               done |= VMSTAT;
+               if ((c = kvm_nlist(kd, timenl)) == -1 || c == X_TIMENL_SIZE)
+                       errx(1, "kvm_nlist: %s %s", "timenl", kvm_geterr(kd));
+       }
        if ((todo & (SUMSTAT|INTRSTAT)) && !(done & (SUMSTAT|INTRSTAT))) {
                done |= SUMSTAT|INTRSTAT;
                (void) kvm_nlist(kd, intrnl);
@@ -636,9 +648,8 @@
                clock_gettime(CLOCK_REALTIME, &now);
        } else {
                if (boottime.tv_sec == 0)
-                       kread(namelist, X_BOOTTIME, &boottime,
-                           sizeof(boottime));
-               if (kreadc(namelist, X_TIME_SECOND, &nowsec, sizeof(nowsec))) {
+                       kread(timenl, X_BOOTTIME, &boottime, sizeof(boottime));
+               if (kreadc(timenl, X_TIME_SECOND, &nowsec, sizeof(nowsec))) {
                        /*
                         * XXX this assignment dance can be removed once
                         * timeval tv_sec is SUS mandated time_t
@@ -646,7 +657,7 @@
                        now.tv_sec = nowsec;
                        now.tv_nsec = 0;
                } else {
-                       kread(namelist, X_TIME, &now, sizeof(now));
+                       kread(timenl, X_TIME, &now, sizeof(now));
                }
        }
        uptime = now.tv_sec - boottime.tv_sec;