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.

1 files changed, 74 insertions, 0 deletions

diff --git a/lib/libutil/kinfo_getvmobject.3 b/lib/libutil/kinfo_getvmobject.3
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index 0000000..dc0edd2
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+++ b/lib/libutil/kinfo_getvmobject.3
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+.\"
+.\" 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