240 lines
6.9 KiB
Groff
240 lines
6.9 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 September 16, 2008
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.Os
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.Dt PMC.K7 3
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.Sh NAME
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.Nm pmc.k7
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.Nd measurement events for
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.Tn AMD
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.Tn Athlon
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(K7 family) CPUs
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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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AMD K7 PMCs are present in the
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.Tn "AMD Athlon"
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series of CPUs and are documented in:
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.Rs
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.%B "AMD Athlon Processor x86 Code Optimization Guide"
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.%N "Publication No. 22007"
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.%D "February 2002"
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.%Q "Advanced Micro Devices, Inc."
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.Re
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.Ss PMC Features
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AMD K7 PMCs are 48 bits wide.
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Each K7 CPU contains 4 PMCs with 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 Yes
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.It PMC_CAP_INTERRUPT Ta Yes
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.It PMC_CAP_INVERT Ta Yes
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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 Yes
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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 Event Qualifiers
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.Pp
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Event specifiers for AMD K7 PMCs can have the following optional
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qualifiers:
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.Bl -tag -width indent
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.It Li count= Ns Ar value
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Configure the counter to increment only if the number of configured
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events measured in a cycle is greater than or equal to
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.Ar value .
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.It Li edge
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Configure the counter to only count negated-to-asserted transitions
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of the conditions expressed by the other qualifiers.
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In other words, the counter will increment only once whenever a given
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condition becomes true, irrespective of the number of clocks during
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which the condition remains true.
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.It Li inv
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Invert the sense of comparision when the
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.Dq Li count
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qualifier is present, making the counter to increment when the
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number of events per cycle is less than the value specified by
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the
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.Dq Li count
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qualifier.
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.It Li os
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Configure the PMC to count events happening at privilege level 0.
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.It Li unitmask= Ns Ar mask
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This qualifier is used to further qualify a select few events,
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.Dq Li k7-dc-refills-from-l2 ,
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.Dq Li k7-dc-refills-from-system
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and
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.Dq Li k7-dc-writebacks .
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Here
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.Ar mask
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is a string of the following characters optionally separated by
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.Ql +
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characters:
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.Pp
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.Bl -tag -width indent -compact
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.It Li m
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Count operations for lines in the
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.Dq Modified
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state.
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.It Li o
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Count operations for lines in the
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.Dq Owner
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state.
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.It Li e
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Count operations for lines in the
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.Dq Exclusive
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state.
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.It Li s
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Count operations for lines in the
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.Dq Shared
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state.
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.It Li i
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Count operations for lines in the
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.Dq Invalid
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state.
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.El
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.Pp
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If no
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.Dq Li unitmask
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qualifier is specified, the default is to count events for caches
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lines in any of the above states.
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.It Li usr
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Configure the PMC to count events occurring at privilege levels 1, 2
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or 3.
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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 were specified, the default is to enable both.
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.Ss AMD K7 Event Specifiers
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The event specifiers supported on AMD K7 PMCs are:
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.Bl -tag -width indent
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.It Li k7-dc-accesses
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Count data cache accesses.
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.It Li k7-dc-misses
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Count data cache misses.
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.It Li k7-dc-refills-from-l2 Op Li ,unitmask= Ns Ar mask
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Count data cache refills from L2 cache.
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This event may be further qualified using the
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.Dq Li unitmask
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qualifier.
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.It Li k7-dc-refills-from-system Op Li ,unitmask= Ns Ar mask
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Count data cache refills from system memory.
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This event may be further qualified using the
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.Dq Li unitmask
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qualifier.
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.It Li k7-dc-writebacks Op Li ,unitmask= Ns Ar mask
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Count data cache writebacks.
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This event may be further qualified using the
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.Dq Li unitmask
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qualifier.
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.It Li k7-l1-dtlb-miss-and-l2-dtlb-hits
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Count L1 DTLB misses and L2 DTLB hits.
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.It Li k7-l1-and-l2-dtlb-misses
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Count L1 and L2 DTLB misses.
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.It Li k7-misaligned-references
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Count misaligned data references.
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.It Li k7-ic-fetches
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Count instruction cache fetches.
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.It Li k7-ic-misses
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Count instruction cache misses.
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.It Li k7-l1-itlb-misses
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Count L1 ITLB misses that are L2 ITLB hits.
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.It Li k7-l1-l2-itlb-misses
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Count L1 (and L2) ITLB misses.
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.It Li k7-retired-instructions
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Count all retired instructions.
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.It Li k7-retired-ops
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Count retired ops.
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.It Li k7-retired-branches
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Count all retired branches (conditional, unconditional, exceptions
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and interrupts).
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.It Li k7-retired-branches-mispredicted
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Count all misprediced retired branches.
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.It Li k7-retired-taken-branches
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Count retired taken branches.
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.It Li k7-retired-taken-branches-mispredicted
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Count mispredicted taken branches that were retired.
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.It Li k7-retired-far-control-transfers
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Count retired far control transfers.
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.It Li k7-retired-resync-branches
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Count retired resync branches (non control transfer branches).
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.It Li k7-interrupts-masked-cycles
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Count the number of cycles when the processor's
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.Va IF
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flag was zero.
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.It Li k7-interrupts-masked-while-pending-cycles
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Count the number of cycles interrupts were masked while pending due
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to the processor's
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.Va IF
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flag being zero.
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.It Li k7-hardware-interrupts
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Count the number of taken hardware interrupts.
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.El
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.Ss Event Name Aliases
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The following table shows the mapping between the PMC-independent
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aliases supported by
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.Lb libpmc
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and the underlying hardware events used.
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.Bl -column "branch-mispredicts" "Description"
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.It Em Alias Ta Em Event
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.It Li branches Ta Li k7-retired-branches
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.It Li branch-mispredicts Ta Li k7-retired-branches-mispredicted
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.It Li dc-misses Ta Li k7-dc-misses
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.It Li ic-misses Ta Li k7-ic-misses
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.It Li instructions Ta Li k7-retired-instructions
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.It Li interrupts Ta Li k7-hardware-interrupts
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.It Li unhalted-cycles Ta (unsupported)
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.El
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.Sh SEE ALSO
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.Xr pmc 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 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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