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.Dd October 4, 2008 25.Dt PMC.TSC 3 26.Os 27.Sh NAME 28.Nm pmc.tsc 29.Nd measurements using the i386 timestamp counter 30.Sh LIBRARY 31.Lb libpmc 32.Sh SYNOPSIS 33.In pmc.h 34.Sh DESCRIPTION 35In the i386 architecture, the timestamp counter is a monotonically 36non-decreasing counter that counts processor cycles. 37.Pp 38This counter may be selected specifying an event specifier 39.Dq Li tsc 40to 41.Xr pmc_allocate 3 . 42The TSC is a read-only counter that may only be allocated in 43system-wide counting mode. 44The 45.Dq Li tsc 46event does not support further event qualifiers. 47.Pp 48Multiple processes are allowed to allocate the TSC. 49Once allocated, the TSC may be read using the 50.Fn pmc_read 51function, or by using the 52.Li RDTSC 53instruction. 54.Ss Event Name Aliases 55The alias 56.Dq Li cycles 57maps to the TSC. 58.Sh SEE ALSO 59.Xr pmc 3 , 60.Xr pmc.amd 3 , 61.Xr pmc.atom 3 , 62.Xr pmc.core 3 , 63.Xr pmc.core2 3 , 64.Xr pmc.iaf 3 , 65.Xr pmc.soft 3 , 66.Xr pmclog 3 , 67.Xr hwpmc 4 68.Sh HISTORY 69The 70.Nm pmc 71library first appeared in 72.Fx 6.0 . 73.Sh AUTHORS 74The 75.Lb libpmc 76library was written by 77.An Joseph Koshy Aq Mt jkoshy@FreeBSD.org . 78