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FreeBSD hs32.drive.ne.jp 9.1-RELEASE FreeBSD 9.1-RELEASE #1: Wed Jan 14 12:18:08 JST 2015 root@hs32.drive.ne.jp:/sys/amd64/compile/hs32 amd64 |
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.\" 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 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: release/9.1.0/lib/libpmc/pmc.tsc.3 236238 2012-05-29 14:50:21Z fabient $ .\" .Dd October 4, 2008 .Dt PMC.TSC 3 .Os .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 , .Xr pmc.atom 3 , .Xr pmc.core 3 , .Xr pmc.core2 3 , .Xr pmc.iaf 3 , .Xr pmc.k7 3 , .Xr pmc.k8 3 , .Xr pmc.p4 3 , .Xr pmc.p5 3 , .Xr pmc.p6 3 , .Xr pmc.soft 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 .