511e378b14
cd src/share; find man[1-9] -type f|xargs perl -pi -e 's/[ \t]+$//' BTW, what editors are the culprits? I'm using vim and it shows me whitespace at EOL in troff files with a thick blue block... Reviewed by: Silence from cvs diff -b MFC after: 7 days
204 lines
6.1 KiB
Groff
204 lines
6.1 KiB
Groff
.\"
|
|
.\" Copyright 1996 Massachusetts Institute of Technology
|
|
.\"
|
|
.\" Permission to use, copy, modify, and distribute this software and
|
|
.\" its documentation for any purpose and without fee is hereby
|
|
.\" granted, provided that both the above copyright notice and this
|
|
.\" permission notice appear in all copies, that both the above
|
|
.\" copyright notice and this permission notice appear in all
|
|
.\" supporting documentation, and that the name of M.I.T. not be used
|
|
.\" in advertising or publicity pertaining to distribution of the
|
|
.\" software without specific, written prior permission. M.I.T. makes
|
|
.\" no representations about the suitability of this software for any
|
|
.\" purpose. It is provided "as is" without express or implied
|
|
.\" warranty.
|
|
.\"
|
|
.\" THIS SOFTWARE IS PROVIDED BY M.I.T. ``AS IS''. M.I.T. DISCLAIMS
|
|
.\" ALL EXPRESS OR IMPLIED WARRANTIES WITH REGARD TO THIS SOFTWARE,
|
|
.\" INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
|
|
.\" MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT
|
|
.\" SHALL M.I.T. 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 March 26, 1996
|
|
.Dt PERFMON 4 i386
|
|
.Os
|
|
.Sh NAME
|
|
.Nm perfmon
|
|
.Nd CPU performance-monitoring interface
|
|
.Sh SYNOPSIS
|
|
.Cd cpu I586_CPU
|
|
.Cd cpu I686_CPU
|
|
.Cd options PERFMON
|
|
.Sh DESCRIPTION
|
|
The
|
|
.Nm
|
|
driver provides access to the internal performance-monitoring
|
|
capabilities of the
|
|
.Tn Intel
|
|
.Tn Pentium
|
|
and
|
|
.Tn "Pentium Pro"
|
|
CPUs. These processors implement two internal counters which can be
|
|
configured to measure a variety of events for either count or duration
|
|
(in CPU cycles), as well as a cycle counter which counts clock cycles.
|
|
The
|
|
.Nm
|
|
driver provides a device-style interface to these capabilities.
|
|
.Pp
|
|
All access to the performance-monitoring counters is performed through
|
|
the special device file
|
|
.Dq Pa /dev/perfmon .
|
|
This device supports a number of
|
|
.Xr ioctl 2
|
|
requests, defined in
|
|
.Aq Pa machine/perfmon.h
|
|
along with the definitions of the various counters for both
|
|
.Tn Pentium
|
|
and
|
|
.Tn "Pentium Pro"
|
|
processors.
|
|
.Pp
|
|
.Sy NOTA BENE :
|
|
The set of available events differs from processor to processor. It
|
|
is the responsibility of the programmer to ensure that the event
|
|
numbers used are the correct ones for the CPU type being measured.
|
|
.Pp
|
|
The following
|
|
.Xr ioctl 2
|
|
requests are defined:
|
|
.Bl -tag -width PMIOTSTAMP
|
|
.It Dv PMIOSETUP
|
|
.Pq Li "struct pmc"
|
|
Set up a counter with parameters and flags defined in the structure.
|
|
The following fields are defined in
|
|
.Li struct pmc :
|
|
.Bl -tag -width "u_char pmc_eventx"
|
|
.It Li "int pmc_num"
|
|
the number of the counter in question; must be less than
|
|
.Dv NPMC
|
|
(currently 2).
|
|
.It Li "u_char pmc_event"
|
|
the particular event number to be monitored, as defined in
|
|
.Aq Pa machine/perfmon.h .
|
|
.It Li "u_char pmc_unit"
|
|
the unit mask value, specific to the event type (see the
|
|
.Tn Intel
|
|
documentation).
|
|
.It Li "u_char pmc_flags"
|
|
flags modifying the operation of the counter (see below).
|
|
.It Li "u_char pmc_mask"
|
|
the counter mask value; essentially, this is a threshold used to
|
|
restrict the count to events lasting more (or less) than the specified
|
|
number of clocks.
|
|
.El
|
|
.Pp
|
|
The following
|
|
.Li pmc_flags
|
|
values are defined:
|
|
.Bl -tag -compact -width PMCF_USRxx
|
|
.It Dv PMCF_USR
|
|
count events in user mode
|
|
.It Dv PMCF_OS
|
|
count events in kernel mode
|
|
.It Dv PMCF_E
|
|
count number of events rather than their duration
|
|
.It Dv PMCF_INV
|
|
invert the sense of the counter mask comparison
|
|
.El
|
|
.It Dv PMIOGET
|
|
.Pq Li "struct pmc"
|
|
returns the current configuration of the specified counter.
|
|
.It Dv PMIOSTART
|
|
.It Dv PMIOSTOP
|
|
.Pq Li int
|
|
starts (stops) the specified counter. Due to hardware deficiencies,
|
|
counters must be started and stopped in numerical order. (That is to
|
|
say, counter 0 can never be stopped without first stopping counter 1.)
|
|
The driver will
|
|
.Em not
|
|
enforce this restriction (since it may not be present in future CPUs).
|
|
.It Dv PMIORESET
|
|
.Pq Li int
|
|
reset the specified counter to zero. The counter should be stopped
|
|
with
|
|
.Dv PMIOSTOP
|
|
before it is reset. All counters are automatically reset by
|
|
.Dv PMIOSETUP .
|
|
.It Dv PMIOREAD
|
|
.Pq Li "struct pmc_data"
|
|
get the current value of the counter. The
|
|
.Li pmc_data
|
|
structure defines two fields:
|
|
.Pp
|
|
.Bl -tag -compact -width "quad_t pmcd_value"
|
|
.It Li "int pmcd_num"
|
|
the number of the counter to read
|
|
.It Li "quad_t pmcd_value"
|
|
the resulting value as a 64-bit signed integer
|
|
.El
|
|
.Pp
|
|
In the future, it may be possible to use the
|
|
.Li RDPMC
|
|
instruction on
|
|
.Tn "Pentium Pro"
|
|
processors to read the counters directly.
|
|
.It Dv PMIOTSTAMP
|
|
.Pq Li "struct pmc_tstamp"
|
|
read the time stamp counter. The
|
|
.Li pmc_tstamp
|
|
structure defines two fields:
|
|
.Pp
|
|
.Bl -tag -compact -width "quad_t pmct_value"
|
|
.It Li "int pmct_rate"
|
|
the approximate rate of the counter, in MHz
|
|
.It Li "quad_t pmct_value"
|
|
the current value of the counter as a 64-bit integer
|
|
.El
|
|
.Pp
|
|
It is important to note that the counter rate, as provided in the
|
|
.Li pmct_rate
|
|
field, is often incorrect because of calibration difficulties and
|
|
non-integral clock rates. This field should be considered more of a
|
|
hint or sanity-check than an actual representation of the rate of
|
|
clock ticks.
|
|
.El
|
|
.Sh FILES
|
|
.Bl -tag -compact -width "/usr/include/machine/perfmon.h"
|
|
.It Pa /dev/perfmon
|
|
character device interface to counters
|
|
.It Pa /usr/include/machine/perfmon.h
|
|
include file with definitions of structures and event types
|
|
.It Pa /usr/share/examples/perfmon
|
|
sample source code demonstrating use of all the
|
|
.Fn ioctl
|
|
commands
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr ioctl 2
|
|
.Rs
|
|
.%A Intel Corporation
|
|
.%B Pentium Pro Family Developer's Manual
|
|
.%D January 1996
|
|
.%V vol. 3
|
|
.%O Operating System Writer's Manual
|
|
.Re
|
|
.Sh HISTORY
|
|
The
|
|
.Nm
|
|
device first appeared in
|
|
.Fx 2.2 .
|
|
.Sh AUTHORS
|
|
The
|
|
.Nm
|
|
driver was written by
|
|
.An Garrett A. Wollman ,
|
|
MIT Laboratory for Computer Science.
|