mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-15 10:17:20 +00:00
026dbd291e
Advantages: - Reduces the number of different license versions in the tree - Eliminates a typo - Removes some incorrect author attributions due to c/p - Removes c/p error potential for future pmc manpages Approved by: jkoshy, gnn, rpaulo, fabient (copyright holders) MFC after: 1 week
85 lines
2.6 KiB
Groff
85 lines
2.6 KiB
Groff
.\" Copyright (c) 2007 Joseph Koshy. 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 November 25, 2007
|
|
.Dt PMC_READ 3
|
|
.Os
|
|
.Sh NAME
|
|
.Nm pmc_read ,
|
|
.Nm pmc_rw ,
|
|
.Nm pmc_write ,
|
|
.Nd read and write hardware performance counters
|
|
.Sh LIBRARY
|
|
.Lb libpmc
|
|
.Sh SYNOPSIS
|
|
.In pmc.h
|
|
.Ft int
|
|
.Fn pmc_read "pmc_id_t pmc" "pmc_value_t *value"
|
|
.Ft int
|
|
.Fn pmc_rw "pmc_id_t pmc" "pmc_value_t newvalue" "pmc_value_t *oldvaluep"
|
|
.Ft int
|
|
.Fn pmc_write "pmc_id_t pmc" "pmc_value_t value"
|
|
.Sh DESCRIPTION
|
|
These functions read and write the current value of a PMC.
|
|
.Pp
|
|
Function
|
|
.Fn pmc_read
|
|
will read the current value of the PMC specified by argument
|
|
.Fa pmc
|
|
and write it to the location specified by argument
|
|
.Fa value .
|
|
.Pp
|
|
Function
|
|
.Fn pmc_write
|
|
will set the current value of the PMC specified by argument
|
|
.Fa pmc
|
|
to the value specified by argument
|
|
.Fa value .
|
|
.Pp
|
|
Function
|
|
.Fn pmc_rw
|
|
combines a read and a write into a single atomic operation.
|
|
.Pp
|
|
For write operations the PMC should be a quiescent state.
|
|
.Sh RETURN VALUES
|
|
.Rv -std
|
|
.Sh ERRORS
|
|
A call to these functions may fail with the following errors:
|
|
.Bl -tag -width Er
|
|
.It Bq Er EBUSY
|
|
A write operation specified a currently running PMC.
|
|
.It Bq Er EINVAL
|
|
Argument
|
|
.Fa pmc
|
|
specified a PMC not in a readable state.
|
|
.It Bq Er EINVAL
|
|
The PMC specified by argument
|
|
.Fa pmc
|
|
was not owned by the current process.
|
|
.El
|
|
.Sh SEE ALSO
|
|
.Xr pmc 3 ,
|
|
.Xr hwpmc 4
|