1.\" Copyright (c) 2003-2008 Joseph Koshy. All rights reserved. 2.\" 3.\" Redistribution and use in source and binary forms, with or without 4.\" modification, are permitted provided that the following conditions 5.\" are met: 6.\" 1. Redistributions of source code must retain the above copyright 7.\" notice, this list of conditions and the following disclaimer. 8.\" 2. Redistributions in binary form must reproduce the above copyright 9.\" notice, this list of conditions and the following disclaimer in the 10.\" documentation and/or other materials provided with the distribution. 11.\" 12.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 13.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 14.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 15.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 16.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 17.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 18.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 19.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 20.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 21.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 22.\" SUCH DAMAGE. 23.\" 24.\" $FreeBSD$ 25.\" 26.Dd October 4, 2008 27.Dt PMC.TSC 3 28.Os 29.Sh NAME 30.Nm pmc.tsc 31.Nd measurements using the i386 timestamp counter 32.Sh LIBRARY 33.Lb libpmc 34.Sh SYNOPSIS 35.In pmc.h 36.Sh DESCRIPTION 37In the i386 architecture, the timestamp counter is a monotonically 38non-decreasing counter that counts processor cycles. 39.Pp 40This counter may be selected specifying an event specifier 41.Dq Li tsc 42to 43.Xr pmc_allocate 3 . 44The TSC is a read-only counter that may only be allocated in 45system-wide counting mode. 46The 47.Dq Li tsc 48event does not support further event qualifiers. 49.Pp 50Multiple processes are allowed to allocate the TSC. 51Once allocated, the TSC may be read using the 52.Fn pmc_read 53function, or by using the 54.Li RDTSC 55instruction. 56.Ss Event Name Aliases 57The alias 58.Dq Li cycles 59maps to the TSC. 60.Sh SEE ALSO 61.Xr pmc 3 , 62.Xr pmc.atom 3 , 63.Xr pmc.core 3 , 64.Xr pmc.core2 3 , 65.Xr pmc.iaf 3 , 66.Xr pmc.k7 3 , 67.Xr pmc.k8 3 , 68.Xr pmc.p4 3 , 69.Xr pmc.p5 3 , 70.Xr pmc.p6 3 , 71.Xr pmc.soft 3 , 72.Xr pmclog 3 , 73.Xr hwpmc 4 74.Sh HISTORY 75The 76.Nm pmc 77library first appeared in 78.Fx 6.0 . 79.Sh AUTHORS 80The 81.Lb libpmc 82library was written by 83.An Joseph Koshy Aq Mt jkoshy@FreeBSD.org . 84