vmstat -s "active pages" / "inactive pages" output

[Havard Eidnes <he%NetBSD.org@localhost>]

Hi,

it appears that between netbsd-3 and netbsd-4 we lost the "active
pages" and "inactive pages" output in "vmstat -s" output.  The
attached patch restores that part of the output when run on the
active kernel (since sysctl() can't be used on a crash dump).

Any objection to committing this?

Regards,

- Håvard

Index: vmstat.c
===================================================================
RCS file: /cvsroot/src/usr.bin/vmstat/vmstat.c,v
retrieving revision 1.153
diff -u -p -r1.153 vmstat.c
--- vmstat.c    17 Oct 2006 15:13:08 -0000      1.153
+++ vmstat.c    18 Aug 2008 09:49:16 -0000
@@ -783,6 +783,22 @@ dosum(void)
 {
        struct nchstats nchstats;
        u_long nchtotal;
+       int mib[2];
+       struct uvmexp_sysctl uvmexp2;
+       size_t ssize;
+       int active_kernel;
+
+       ssize = sizeof(uvmexp2);
+       memset(&uvmexp2, 0, ssize);
+       active_kernel = (nlistf == NULL && memf == NULL);
+       if (active_kernel) {
+               /* only on active kernel */
+               mib[0] = CTL_VM;
+               mib[1] = VM_UVMEXP2;
+               if (sysctl(mib, 2, &uvmexp2, &ssize, NULL, 0) < 0)
+                       fprintf(stderr, "%s: sysctl vm.uvmexp2 failed: %s\n",
+                               getprogname(), strerror(errno));
+       }
 
        kread(namelist, X_UVMEXP, &uvmexp, sizeof(uvmexp));
 
@@ -793,6 +809,10 @@ dosum(void)
 
        (void)printf("%9u pages managed\n", uvmexp.npages);
        (void)printf("%9u pages free\n", uvmexp.free);
+       if (active_kernel) {
+               (void)printf("%9" PRIu64 " pages active\n", uvmexp2.active);
+               (void)printf("%9" PRIu64 " pages inactive\n", uvmexp2.inactive);
+       }
        (void)printf("%9u pages paging\n", uvmexp.paging);
        (void)printf("%9u pages wired\n", uvmexp.wired);
        (void)printf("%9u zero pages\n", uvmexp.zeropages);