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looking at a high resolution clock for each of the following events: function call, function return, interrupt entry, interrupt exit, and interesting branches. The differences between the times of these events are added at appropriate places in a ordinary histogram (as if very fast statistical profiling sampled the pc at those places) so that ordinary gprof can be used to analyze the times. gmon.h: Histogram counters need to be 4 bytes for microsecond resolutions. They will need to be larger for the 586 clock. The comments were vax-centric and wrong even on vaxes. Does anyone disagree? gprof4.c: The standard gprof should support counters of all integral sizes and the size of the counter should be in the gmon header. This hack will do until then. (Use gprof4 -u to examine the results of non-statistical profiling.) config/*: Non-statistical profiling is configured with `config -pp'. `config -p' still gives ordinary profiling. kgmon/*: Non-statistical profiling is enabled with `kgmon -B'. `kgmon -b' still enables ordinary profiling (and distables non-statistical profiling) if non-statistical profiling is configured.
130 lines
3.9 KiB
Groff
130 lines
3.9 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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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. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its 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 REGENTS 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 REGENTS 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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.\" @(#)kgmon.8 8.1 (Berkeley) 6/6/93
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.\"
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.Dd June 6, 1993
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.Dt KGMON 8
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.Os BSD 4.2
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.Sh NAME
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.Nm kgmon
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.Nd generate a dump of the operating system's profile buffers
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.Sh SYNOPSIS
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.Nm kgmon
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.Op Fl Bbhpr
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.Op Fl M core
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.Op Fl N system
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.Sh DESCRIPTION
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.Nm Kgmon
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is a tool used when profiling the operating system.
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When no arguments are supplied,
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.Nm kgmon
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indicates the state of operating system profiling as running,
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off, or not configured.
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(see
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.Xr config 8 )
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If the
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.Fl p
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flag is specified,
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.Nm kgmon
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extracts profile data from the operating system and produces a
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.Pa gmon.out
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file suitable for later analysis by
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.Xr gprof 1 .
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.Pp
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The options are as follows:
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.Bl -tag -width Ds
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.It Fl B
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Resume the collection of high resolution profile data.
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.It Fl b
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Resume the collection of low resolution profile data.
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.It Fl h
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Stop the collection of profile data.
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.It Fl p
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Dump the contents of the profile buffers into a
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.Pa gmon.out
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file.
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.It Fl r
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Reset all the profile buffers.
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If the
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.Fl p
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flag is also specified, the
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.Pa gmon.out
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file is generated before the buffers are reset.
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.It Fl M
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Extract values associated with the name list from the specified core
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instead of the default ``/dev/kmem''.
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.It Fl N
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Extract the name list from the specified system instead of the
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default ``/kernel''.
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.El
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.Pp
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If neither
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.Fl B
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nor
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.Fl b
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nor
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.Fl h
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is specified, the state of profiling collection remains unchanged.
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For example, if the
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.Fl p
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flag is specified and profile data is being collected,
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profiling will be momentarily suspended,
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the operating system profile buffers will be dumped,
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and profiling will be immediately resumed.
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.Pp
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The profile buffers should be reset when the resolution
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of the profile data is changed.
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.Sh FILES
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.Bl -tag -width /dev/kmemx -compact
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.It Pa /kernel
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the default system
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.It Pa /dev/kmem
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the default memory
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.El
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.Sh SEE ALSO
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.Xr gprof 1 ,
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.Xr config 8
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.Sh DIAGNOSTICS
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Users with only read permission on
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.Pa /dev/kmem
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cannot change the state
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of profiling collection.
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They can get a
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.Pa gmon.out
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file with the warning that the data may be
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inconsistent if profiling is in progress.
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.Sh HISTORY
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The
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.Nm
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command appeared in
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.Bx 4.2 .
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