2008-09-16 16:29:41 +00:00
|
|
|
.\" Copyright (c) 2003-2008 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 Joseph Koshy ``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 Joseph Koshy 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.
|
|
|
|
|
.\"
|
|
|
|
|
.\" $FreeBSD$
|
|
|
|
|
.\"
|
2008-10-04 12:44:05 +00:00
|
|
|
.Dd October 4, 2008
|
2008-09-16 16:29:41 +00:00
|
|
|
.Dt PMC.TSC 3
|
2010-04-14 19:08:06 +00:00
|
|
|
.Os
|
2008-09-16 16:29:41 +00:00
|
|
|
.Sh NAME
|
|
|
|
|
.Nm pmc.tsc
|
|
|
|
|
.Nd measurements using the i386 timestamp counter
|
|
|
|
|
.Sh LIBRARY
|
|
|
|
|
.Lb libpmc
|
|
|
|
|
.Sh SYNOPSIS
|
|
|
|
|
.In pmc.h
|
|
|
|
|
.Sh DESCRIPTION
|
|
|
|
|
In the i386 architecture, the timestamp counter is a monotonically
|
|
|
|
|
non-decreasing counter that counts processor cycles.
|
|
|
|
|
.Pp
|
|
|
|
|
This counter may be selected specifying an event specifier
|
|
|
|
|
.Dq Li tsc
|
|
|
|
|
to
|
|
|
|
|
.Xr pmc_allocate 3 .
|
|
|
|
|
The TSC is a read-only counter that may only be allocated in
|
|
|
|
|
system-wide counting mode.
|
|
|
|
|
The
|
|
|
|
|
.Dq Li tsc
|
|
|
|
|
event does not support further event qualifiers.
|
|
|
|
|
.Pp
|
|
|
|
|
Multiple processes are allowed to allocate the TSC.
|
|
|
|
|
Once allocated, the TSC may be read using the
|
|
|
|
|
.Fn pmc_read
|
|
|
|
|
function, or by using the
|
|
|
|
|
.Li RDTSC
|
|
|
|
|
instruction.
|
|
|
|
|
.Ss Event Name Aliases
|
|
|
|
|
The alias
|
|
|
|
|
.Dq Li cycles
|
|
|
|
|
maps to the TSC.
|
|
|
|
|
.Sh SEE ALSO
|
|
|
|
|
.Xr pmc 3 ,
|
2008-10-04 12:44:05 +00:00
|
|
|
.Xr pmc.atom 3 ,
|
|
|
|
|
.Xr pmc.core 3 ,
|
|
|
|
|
.Xr pmc.core2 3 ,
|
|
|
|
|
.Xr pmc.iaf 3 ,
|
2008-09-16 16:29:41 +00:00
|
|
|
.Xr pmc.k7 3 ,
|
|
|
|
|
.Xr pmc.k8 3 ,
|
|
|
|
|
.Xr pmc.p4 3 ,
|
|
|
|
|
.Xr pmc.p5 3 ,
|
|
|
|
|
.Xr pmc.p6 3 ,
|
|
|
|
|
.Xr pmclog 3 ,
|
|
|
|
|
.Xr hwpmc 4
|
|
|
|
|
.Sh HISTORY
|
|
|
|
|
The
|
|
|
|
|
.Nm pmc
|
|
|
|
|
library first appeared in
|
|
|
|
|
.Fx 6.0 .
|
|
|
|
|
.Sh AUTHORS
|
|
|
|
|
The
|
|
|
|
|
.Lb libpmc
|
|
|
|
|
library was written by
|
|
|
|
|
.An "Joseph Koshy"
|
|
|
|
|
.Aq jkoshy@FreeBSD.org .
|
