MFC 283624,283630:

Export a list of VM objects in the system via a sysctl.  The list can be
examined via 'vmstat -o'.  It can be used to determine which files are
using physical pages of memory and how much each is using.

4 files changed, 174 insertions, 2 deletions

diff --git a/lib/libutil/Makefile b/lib/libutil/Makefile
index 144fb5c..4e10729 100644
--- a/lib/libutil/Makefile
+++ b/lib/libutil/Makefile
@@ -10,7 +10,8 @@ SHLIB_MAJOR= 9
 
 SRCS=	_secure_path.c auth.c expand_number.c flopen.c fparseln.c gr_util.c \
 	hexdump.c humanize_number.c kinfo_getfile.c kinfo_getfile.c \
-	kinfo_getallproc.c kinfo_getproc.c kinfo_getvmmap.c kld.c \
+	kinfo_getallproc.c kinfo_getproc.c kinfo_getvmmap.c \
+	kinfo_getvmobject.c kld.c \
 	login_auth.c login_cap.c \
 	login_class.c login_crypt.c login_ok.c login_times.c login_tty.c \
 	pidfile.c property.c pty.c pw_util.c quotafile.c realhostname.c \
@@ -27,7 +28,8 @@ CFLAGS+= -I${.CURDIR} -I${.CURDIR}/../libc/gen/
 
 MAN+=	expand_number.3 flopen.3 fparseln.3 hexdump.3 \
 	humanize_number.3 kinfo_getallproc.3 kinfo_getfile.3 \
-	kinfo_getproc.3 kinfo_getvmmap.3 kld.3 login_auth.3 login_cap.3 \
+	kinfo_getproc.3 kinfo_getvmmap.3 kinfo_getvmobject.3 kld.3 \
+	login_auth.3 login_cap.3 \
 	login_class.3 login_ok.3 login_times.3 login_tty.3 pidfile.3 \
 	property.3 pty.3 quotafile.3 realhostname.3 realhostname_sa.3 \
 	_secure_path.3 trimdomain.3 uucplock.3 pw_util.3
diff --git a/lib/libutil/kinfo_getvmobject.3 b/lib/libutil/kinfo_getvmobject.3
new file mode 100644
index 0000000..dc0edd2
--- /dev/null
+++ b/lib/libutil/kinfo_getvmobject.3
@@ -0,0 +1,74 @@
+.\"
+.\" Copyright (c) 2015 John Baldwin <jhb@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd May 27, 2015
+.Dt KINFO_GETVMOBJECT 3
+.Os
+.Sh NAME
+.Nm kinfo_getvmobject
+.Nd function for getting system-wide memory information
+.Sh LIBRARY
+.Lb libutil
+.Sh SYNOPSIS
+.In sys/types.h
+.In sys/user.h
+.In libutil.h
+.Ft struct kinfo_vmobject *
+.Fn kinfo_getvmobject "int *cntp"
+.Sh DESCRIPTION
+This function is used to obtain information about the objects using memory
+in the system.
+.Pp
+The
+.Ar cntp
+argument allows the caller to know how many records are returned.
+.Pp
+This function is a wrapper around the
+.Dq vm.objects
+.Xr sysctl 3
+MIB.
+While the kernel returns a packed structure, this function expands the
+data into a fixed record format.
+.Sh RETURN VALUES
+On success the
+.Fn kinfo_getvmobject
+function returns a pointer to an array of
+.Vt struct kinfo_vmobject
+structures as defined by
+.In sys/user.h .
+The array is allocated by an internal call to
+.Xr malloc 3
+and must be freed by the caller with a call to
+.Xr free 3 .
+On failure the
+.Fn kinfo_getvmobject
+function returns
+.Dv NULL .
+.Sh SEE ALSO
+.Xr free 3 ,
+.Xr kinfo_getvmmap 3 ,
+.Xr malloc 3
diff --git a/lib/libutil/kinfo_getvmobject.c b/lib/libutil/kinfo_getvmobject.c
new file mode 100644
index 0000000..7e031da
--- /dev/null
+++ b/lib/libutil/kinfo_getvmobject.c
@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2013 Hudson River Trading LLC
+ * Written by: John H. Baldwin <jhb@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <sys/user.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "libutil.h"
+
+struct kinfo_vmobject *
+kinfo_getvmobject(int *cntp)
+{
+	char *buf, *bp, *ep;
+	struct kinfo_vmobject *kvo, *list, *kp;
+	size_t len;
+	int cnt, i;
+
+	buf = NULL;
+	for (i = 0; i < 3; i++) {
+		if (sysctlbyname("vm.objects", NULL, &len, NULL, 0) < 0)
+			return (NULL);
+		buf = reallocf(buf, len);
+		if (buf == NULL)
+			return (NULL);
+		if (sysctlbyname("vm.objects", buf, &len, NULL, 0) == 0)
+			goto unpack;
+		if (errno != ENOMEM) {
+			free(buf);
+			return (NULL);
+		}
+	}
+	free(buf);
+	return (NULL);
+
+unpack:
+	/* Count items */
+	cnt = 0;
+	bp = buf;
+	ep = buf + len;
+	while (bp < ep) {
+		kvo = (struct kinfo_vmobject *)(uintptr_t)bp;
+		bp += kvo->kvo_structsize;
+		cnt++;
+	}
+
+	list = calloc(cnt, sizeof(*list));
+	if (list == NULL) {
+		free(buf);
+		return (NULL);
+	}
+
+	/* Unpack */
+	bp = buf;
+	kp = list;
+	while (bp < ep) {
+		kvo = (struct kinfo_vmobject *)(uintptr_t)bp;
+		memcpy(kp, kvo, kvo->kvo_structsize);
+		bp += kvo->kvo_structsize;
+		kp->kvo_structsize = sizeof(*kp);
+		kp++;
+	}
+	free(buf);
+	*cntp = cnt;
+	return (list);
+}
diff --git a/lib/libutil/libutil.h b/lib/libutil/libutil.h
index b8b9836..b20ffa2 100644
--- a/lib/libutil/libutil.h
+++ b/lib/libutil/libutil.h
@@ -102,6 +102,8 @@ struct kinfo_file *
 	kinfo_getfile(pid_t _pid, int *_cntp);
 struct kinfo_vmentry *
 	kinfo_getvmmap(pid_t _pid, int *_cntp);
+struct kinfo_vmobject *
+	kinfo_getvmobject(int *_cntp);
 struct kinfo_proc *
 	kinfo_getallproc(int *_cntp);
 struct kinfo_proc *