[src/trunk]: src/lib/libkvm Clarify the difference to getloadavg(3).

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

details:   https://anonhg.NetBSD.org/src/rev/487688267763
branches:  trunk
changeset: 995181:487688267763
user:      sevan <sevan%NetBSD.org@localhost>
date:      Tue Dec 11 02:29:11 2018 +0000

description:
Clarify the difference to getloadavg(3).

diffstat:

 lib/libkvm/kvm_getloadavg.3 |  17 +++++++++++------
 1 files changed, 11 insertions(+), 6 deletions(-)

diffs (48 lines):

diff -r 9c04e84c575e -r 487688267763 lib/libkvm/kvm_getloadavg.3
--- a/lib/libkvm/kvm_getloadavg.3       Tue Dec 11 01:07:29 2018 +0000
+++ b/lib/libkvm/kvm_getloadavg.3       Tue Dec 11 02:29:11 2018 +0000
@@ -1,4 +1,4 @@
-.\"    $NetBSD: kvm_getloadavg.3,v 1.11 2009/03/10 23:49:07 joerg Exp $
+.\"    $NetBSD: kvm_getloadavg.3,v 1.12 2018/12/11 02:29:11 sevan Exp $
 .\"
 .\" Copyright (c) 1992, 1993
 .\"    The Regents of the University of California.  All rights reserved.
@@ -29,12 +29,12 @@
 .\"
 .\"     @(#)kvm_getloadavg.3   8.1 (Berkeley) 6/4/93
 .\"
-.Dd August 18, 2002
+.Dd December 11, 2018
 .Dt KVM_GETLOADAVG 3
 .Os
 .Sh NAME
 .Nm kvm_getloadavg
-.Nd get system load averages
+.Nd get system load averages, from live or dead kernels
 .Sh LIBRARY
 .Lb libkvm
 .Sh SYNOPSIS
@@ -46,15 +46,20 @@
 The
 .Fn kvm_getloadavg
 function returns the number of processes in the system run queue
-of the kernel indicated by
-.Fa kd ,
-averaged over various periods of time.
+of the kernel or core file, indicated by
+.Fa kd .
 Up to
 .Fa nelem
 samples are retrieved and assigned to successive elements of
 .Fa loadavg Ns Bq .
 The system imposes a maximum of 3 samples, representing averages
 over the last 1, 5, and 15 minutes, respectively.
+On a live system, the load average is obtained by calling
+.Xr getloadavg 3 .
+If performing post mortem on a kernel core file,
+.Nm
+obtains the system load average at the time of death from the core file
+directly.
 .Sh RETURN VALUES
 If the load average was unobtainable, \-1 is returned; otherwise,
 the number of samples actually retrieved is returned.