150 lines
4.4 KiB
Groff
150 lines
4.4 KiB
Groff
.\" Copyright (c) 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 November 14, 2008
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.Os
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.Dt PMC.IAF 3
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.Sh NAME
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.Nm pmc.iaf
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.Nd measurement events for
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.Tn Intel
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fixed function performance counters.
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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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.Tn Intel
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fixed-function PMCs are present in CPUs that conform to version 2 or
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later of the
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.Tn Intel
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Performance Measurement Architecture.
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Each fixed-function PMC measures a specific hardware event.
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The number of fixed-function PMCs implemented in a CPU can vary.
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The number of fixed-function PMCs present can be determined at runtime
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by using function
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.Xr pmc_cpuinfo 3 .
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.Pp
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Intel fixed-function PMCs are documented in
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.Rs
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.%B "IA-32 Intel(R) Architecture Software Developer's Manual"
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.%T "Volume 3: System Programming Guide"
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.%N "Order Number 253669-027US"
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.%D July 2008
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.%Q "Intel Corporation"
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.Re
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.Pp
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.Ss PMC Capabilities
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Fixed-function PMCs support the following capabilities:
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.Bl -column "PMC_CAP_INTERRUPT" "Support"
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.It Em Capability Ta Em Support
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.It PMC_CAP_CASCADE Ta \&No
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.It PMC_CAP_EDGE Ta \&No
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.It PMC_CAP_INTERRUPT Ta Yes
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.It PMC_CAP_INVERT Ta \&No
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.It PMC_CAP_READ Ta Yes
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.It PMC_CAP_PRECISE Ta \&No
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.It PMC_CAP_SYSTEM Ta Yes
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.It PMC_CAP_TAGGING Ta \&No
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.It PMC_CAP_THRESHOLD Ta \&No
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.It PMC_CAP_USER Ta Yes
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.It PMC_CAP_WRITE Ta Yes
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.El
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.Ss Class Name Prefix
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These pmcs are named using a class name prefix of
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.Dq Li iaf- .
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.Ss Event Qualifiers (Fixed Function PMCs)
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These PMCs support the following modifiers:
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.Bl -tag -width indent
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.It Li os
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Configure the PMC to count events occurring at ring level 0.
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.It Li usr
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Configure the PMC to count events occurring at ring levels 1, 2
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or 3.
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.It Li anythread
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.Pq Tn Atom CPUs
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Configure the PMC to count events on all logical processors sharing a
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processor core.
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The default is to count events on the current logical processor.
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.El
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.Pp
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If neither of the
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.Dq Li os
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or
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.Dq Li usr
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qualifiers are specified, the default is to enable both.
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.Ss Event Specifiers (Fixed Function PMCs)
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The fixed function PMCs are selectable using the following
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event names:
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.Bl -tag -width indent
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.It Li INSTR_RETIRED.ANY
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.Pq Fixed Function Counter 0
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The number of instructions retired.
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.It Li CPU_CLK_UNHALTED.CORE
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.Pq Fixed Function Counter 1
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The number of core cycles for which the core is not halted.
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.It Li CPU_CLK_UNHALTED.REF
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.Pq Fixed Function Counter 2
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The number of reference cycles for which the core is not halted.
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.El
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.Sh EXAMPLES
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To measure the number of core cycles for which the core was not halted
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use the event specifier
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.Qq iaf-cpu-clk-unhalted.core .
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.Pp
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To measure the number of user instructions retired use the event specifier
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.Qq iaf-instr-retired.any,usr .
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.Pp
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To measure the number of user instructions retired on all logical processors
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in an
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.Tn Atom
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CPU, use the event specifier
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.Qq iaf-instr-retired.any,usr,anythread .
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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.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 pmc.tsc 3 ,
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.Xr pmc_cpuinfo 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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