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