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'kern.cp_time'. For a live kernel it uses the sysctl. For a crashdump, it first checks to see if the kernel has a 'cp_time' global symbol. If it does, it uses that. If that doesn't work, when it uses the recently added kvm_getmaxcpu(3) and kvm_getpcpu(3) routines to walk all the CPUs and sum up their counters. MFC after: 1 week
78 lines
2.6 KiB
Groff
78 lines
2.6 KiB
Groff
.\" Copyright (c) 2008 Yahoo!, Inc.
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.\" All rights reserved.
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.\" Written by: John Baldwin <jhb@FreeBSD.org>
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the author nor the names of any co-contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd August 19, 2008
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.Dt KVM_GETCPTIME 3
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.Os
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.Sh NAME
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.Nm kvm_getcptime
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.Nd fetch global CPU time statistics
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.Sh LIBRARY
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.Lb libkvm
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.Sh SYNOPSIS
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.In sys/param.h
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.In sys/resource.h
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.In sys/sysctl.h
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.In kvm.h
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.Ft int
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.Fn kvm_getcptime "kvm_t *kd" "long *cp_time"
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.Sh DESCRIPTION
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The
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.Fn kvm_getcptime
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function stores the global CPU time statistics from the kernel
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.Fa kd
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in the array of counters pointed to by
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.Fa cp_time .
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Note that
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.Fa cp_time
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should point to an array of
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.Dv CPUSTATES
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long integers.
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The format of the counters is identical to that output by the
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.Va kern.cp_time
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sysctl.
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.Sh CACHING
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This function caches the nlist values for various kernel variables which it
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reuses in successive calls.
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You may call the function with
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.Fa kd
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set to
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.Dv NULL
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to clear this cache.
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.Sh RETURN VALUES
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The
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.Nm kvm_getcptime
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function returns 0 on success and -1 on failure.
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If an error occurs,
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then an error message may be retrieved via
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.Xr kvm_geterr 3 .
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.Sh SEE ALSO
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.Xr kvm 3
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