f5f9340b98
New kernel events can be added at various location for sampling or counting. This will for example allow easy system profiling whatever the processor is with known tools like pmcstat(8). Simultaneous usage of software PMC and hardware PMC is possible, for example looking at the lock acquire failure, page fault while sampling on instructions. Sponsored by: NETASQ MFC after: 1 month
234 lines
7.9 KiB
Groff
234 lines
7.9 KiB
Groff
.\" Copyright (c) 2012 Davide Italiano <davide@FreeBSD.org>
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.\" 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 THE AUTHORS AND CONTRIBUTORS ``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 THE AUTHORS OR CONTRIBUTORS 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 February 12, 2012
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.Dt PMC.SANDYBRIDGEUC 3
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.Os
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.Sh NAME
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.Nm pmc.sandybridgeuc
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.Nd uncore measurement events for
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.Tn Intel
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.Tn Sandy Bridge
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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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.Tn Intel
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.Tn "Sandy Bridge"
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CPUs contain PMCs conforming to version 3 of the
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.Tn Intel
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performance measurement architecture.
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These CPUs contain two classes of PMCs:
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.Bl -tag -width "Li PMC_CLASS_UCP"
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.It Li PMC_CLASS_UCF
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Fixed-function counters that count only one hardware event per counter.
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.It Li PMC_CLASS_UCP
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Programmable counters that may be configured to count one of a defined
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set of hardware events.
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.El
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.Pp
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The number of PMCs available in each class and their widths need to be
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determined at run time by calling
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.Xr pmc_cpuinfo 3 .
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.Pp
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Intel Sandy Bridge PMCs are documented in
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.Rs
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.%B "Intel(R) 64 and IA-32 Architectures Software Developers Manual"
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.%T "Volume 3B: System Programming Guide, Part 2"
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.%N "Order Number: 253669-039US"
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.%D May 2011
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.%Q "Intel Corporation"
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.Re
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.Ss SANDYBRIDGE UNCORE FIXED FUNCTION PMCS
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These PMCs and their supported events are documented in
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.Xr pmc.ucf 3 .
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Not all CPUs in this family implement fixed-function counters.
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.Ss SANDYBRIDGE UNCORE PROGRAMMABLE PMCS
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The programmable 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 Yes
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.It PMC_CAP_INTERRUPT Ta \&No
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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 \&No
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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 \&No
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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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Event specifiers for these PMCs support the following common
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qualifiers:
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.Bl -tag -width indent
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.It Li cmask= Ns Ar value
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Configure the PMC 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 PMC to count the number of de-asserted to asserted
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transitions of the conditions expressed by the other qualifiers.
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If specified, the counter will increment only once whenever a
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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 comparison when the
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.Dq Li cmask
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qualifier is present, making the counter increment when the number of
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events per cycle is less than the value specified by the
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.Dq Li cmask
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qualifier.
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.El
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.Ss Event Specifiers (Programmable PMCs)
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Sandy Bridge programmable PMCs support the following events:
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.Bl -tag -width indent
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.It Li CBO_XSNP_RESPONSE.RSPIHITI
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.Pq Event 22H, Umask 01H
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Snoop responses received from processor cores to requests initiated by this
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Cbox.
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Must combine with one of the umask values of 20H, 40H, 80H
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.It Li CBO_XSNP_RESPONSE.RSPIHITFSE
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.Pq Event 22H, Umask 02H
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Must combine with one of the umask values of 20H, 40H, 80H
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.It Li CBO_XSNP_RESPONSE.RSPSHITFSE
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.Pq Event 22H, Umask 04H
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Must combine with one of the umask values of 20H, 40H, 80H
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.It Li CBO_XSNP_RESPONSE.RSPSFWDM
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.Pq Event 22H, Umask 08H
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.It Li CBO_XSNP_RESPONSE.RSPIFWDM
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.Pq Event 22H, Umask 01H
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.It Li CBO_XSNP_RESPONSE.AND_EXTERNAL
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.Pq Event 22H, Umask 20H
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Filter on cross-core snoops resulted in external snoop request.
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Must combine with at least one of 01H, 02H, 04H, 08H, 10H
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.It Li CBO_XSNP_RESPONSE.AND_XCORE
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.Pq Event 22H, Umask 40H
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Filter on cross-core snoops resulted in core request.
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Must combine with at least one of 01H, 02H, 04H, 08H, 10H
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.It Li CBO_XSNP_RESPONSE.AND_XCORE
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.Pq Event 22H, Umask 80H
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Filter on cross-core snoops resulted in LLC evictions.
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Must combine with at least one of 01H, 02H, 04H, 08H, 10H
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.It Li CBO_CACHE_LOOKUP.M
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.Pq Event 34H, Umask 01H
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LLC lookup request that access cache and found line in M-state.
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Must combine with one of the umask values of 10H, 20H, 40H, 80H
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.It Li CBO_CACHE_LOOKUP.E
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.Pq Event 34H, Umask 02H
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LLC lookup request that access cache and found line in E-state.
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Must combine with one of the umask values of 10H, 20H, 40H, 80H
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.It Li CBO_CACHE_LOOKUP.S
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.Pq Event 34H, Umask 04H
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LLC lookup request that access cache and found line in S-state.
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Must combine with one of the umask values of 10H, 20H, 40H, 80H
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.It Li CBO_CACHE_LOOKUP.I
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.Pq Event 34H, Umask 08H
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LLC lookup request that access cache and found line in I-state.
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Must combine with one of the umask values of 10H, 20H, 40H, 80H
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.It Li CBO_CACHE_LOOKUP.AND_READ
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.Pq Event 34H, Umask 10H
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Filter on processor core initiated cacheable read requests.
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Must combine with at least one of 01H, 02H, 04H, 08H
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.It Li CBO_CACHE_LOOKUP_AND_READ2
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.Pq Event 34H, Umask 20H
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Filter on processor core initiated cacheable write requests.
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Must combine with at least one of 01H, 02H, 04H, 08H
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.It Li CBO_CACHE_LOOKUP.AND_EXTSNP
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.Pq Event 34H, Umask 40H
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Filter on external snoop requests.
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Must combine with at least one of 01H, 02H, 04H, 08H
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.It Li CBO_CACHE_LOOKUP.AND_ANY
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.Pq Event 34H, Umask 80H
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Filter on any IRQ or IPQ initiated requests including uncacheable,
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noncoherent requests.
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Must combine with at least one of 01H, 02H, 04H, 08H
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.It Li IMPH_CBO_TRK_OCCUPANCY.ALL
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.Pq Event 80H, Umask 01H
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Counts cycles weighted by the number of core-outgoing valid entries.
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Valid entries are between allocation to the first of IDIO or DRSO messages.
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Accounts for coherent and incoherent traffic.
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Counter 0 only
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.It Li IMPH_CBO_TRK_REQUEST.ALL
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.Pq Event 81H, Umask 01H
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Counts the number of core-outgoing entries.
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Accounts for coherent and incoherent traffic.
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.It Li IMPH_CBO_TRK_REQUEST.WRITES
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.Pq Event 81H, Umask 20H
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Counts the number of allocated write entries, include full, partial, and
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evictions.
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.It Li IMPH_CBO_TRK_REQUEST.EVICTIONS
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.Pq Event 81H, Umask 80H
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Counts the number of evictions allocated.
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.It Li IMPH_COH_TRK_OCCUPANCY.ALL
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.Pq Event 83H, Umask 01H
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Counts cycles weighted by the
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number of core-outgoing valid entries in the coherent tracker queue.
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Counter 0 only
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.It Li IMPH_COH_TRK_REQUEST.ALL
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.Pq Event 84H, Umask 01H
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Counts the number of core-outgoing entries in the coherent tracker queue.
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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.atom 3 ,
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.Xr pmc.core 3 ,
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.Xr pmc.corei7 3 ,
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.Xr pmc.corei7uc 3 ,
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.Xr pmc.iaf 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.sandybridge 3 ,
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.Xr pmc.soft 3 ,
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.Xr pmc.tsc 3 ,
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.Xr pmc.ucf 3 ,
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.Xr pmc.westmere 3 ,
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.Xr pmc.westmereuc 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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The support for the Sandy Bridge
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microarchitecture was added by
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.An "Davide Italiano"
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.Aq davide@FreeBSD.org .
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