Skip site navigation (1)Skip section navigation (2)

FreeBSD Man Pages

Man Page or Keyword Search:
Man Architecture
Apropos Keyword Search (all sections) Output format
home | help
PMC.P4(3)	       FreeBSD Library Functions Manual		     PMC.P4(3)

NAME
     pmc.p4 -- measurement events for Intel Pentium 4 and other	Netburst
     architecture CPUs

LIBRARY
     Performance Monitoring Counters Interface Library (libpmc,	-lpmc)

SYNOPSIS
     #include <pmc.h>

DESCRIPTION
     Intel P4 PMCs are present in Intel	Pentium	4 and Xeon processors that use
     the Netburst CPU architecture.

     These PMCs	are documented in "Volume 3: System Programming	Guide",	IA-32
     Intel(R) Architecture Software Developer's	Manual,	Order Number
     245472-012, Intel Corporation, 2003.  Further information about using
     these PMCs	may be found in	IA-32 Intel(R) Architecture Optimization
     Guide, Order Number 248966-009, Intel Corporation,	2003.  Some of these
     events are	affected by processor errata described in Intel(R) Pentium(R)
     4 Processor Specification Update, Document	Number:	249199-059, Intel
     Corporation, April	2005.

   PMC Features
     Intel Pentium 4 PMCs are 40 bits wide.  Each CPU contains 18 PMCs,
     divided into 4 groups with	4, 4, 4	and 6 PMCs respectively.  On proces-
     sors with hyperthreading support, PMC resources are shared	between	logi-
     cal processors.  These PMCs support the following capabilities:

     Capability		  Support
     PMC_CAP_CASCADE	  Yes
     PMC_CAP_EDGE	  Yes
     PMC_CAP_INTERRUPT	  Yes
     PMC_CAP_INVERT	  Yes
     PMC_CAP_READ	  Yes
     PMC_CAP_PRECISE	  Unimplemented
     PMC_CAP_SYSTEM	  Yes
     PMC_CAP_TAGGING	  Yes
     PMC_CAP_THRESHOLD	  Yes
     PMC_CAP_USER	  Yes
     PMC_CAP_WRITE	  Yes

   Event Qualifiers
     Event specifiers for Intel	P4 PMCs	can have the following common quali-
     fiers:

     active=choice
	     (On P4 HTT	CPUs) Filter event counting based on which logical
	     processors	are active.  The allowed values	of choice are:

	     any     Count when	either logical processor is active.
	     both    Count when	both logical processors	are active.
	     none    Count only	when neither logical processor is active.
	     single  Count only	when one logical processor is active.

	     The default is ``both''.

     cascade
	     Configure the PMC to cascade onto its partner.  See Cascading P4
	     PMCs below	for more information.

     edge    Configure the counter to count false to true transitions of the
	     threshold comparison output.  This	qualifier only takes effect if
	     a threshold qualifier has also been specified.

     complement
	     Configure the counter to increment	only when the event count seen
	     is	less than the threshold	qualifier value	specified.

     mask=qualifier
	     Many event	specifiers for Intel P4	PMCs need to be	additionally
	     qualified using a mask qualifier.	The allowed syntax for these
	     qualifiers	is event specific and is described along with the
	     events.

     os	     Configure the PMC to count	when the CPL of	the processor is 0.

     precise
	     Select precise event based	sampling.  Precise sampling is sup-
	     ported by the hardware for	a limited set of events.

     tag=value
	     Configure the PMC to tag the internal uop selected	by the other
	     fields in this event specifier with value value.  This feature is
	     used when cascading PMCs.

     threshold=value
	     Configure the PMC to increment only when the event	counts seen
	     are greater than the specified threshold value value.

     usr     Configure the PMC to count	when the CPL of	the processor is 1, 2
	     or	3.

     If	neither	of the ``os'' or ``usr'' qualifiers are	specified, the default
     is	to enable both.

     On	Intel Pentium 4	processors with	HTT, events are	divided	into two
     classes:

     TS	Events
	     are those where hardware can differentiate	between	events gener-
	     ated on one logical processor from	those generated	on the other.
     TI	Events
	     are those where hardware cannot differentiate between events gen-
	     erated by multiple	logical	processors in a	package.

     Only TS events are	allowed	for use	with process-mode PMCs on Pen-
     tium-4/HTT	CPUs.

     The event specifiers supported by Intel P4	PMCs are:

     p4-128bit-mmx-uop [,mask=flags]
	     (TI event)	Count integer SIMD SSE2	instructions that operate on
	     128 bit SIMD operands.  Qualifier flags can take the following
	     value (which is also the default):

	     all     Count all uops operating on 128 bit SIMD integer operands
		     in	memory or XMM register.

	     If	an instruction contains	more than one 128 bit MMX uop, then
	     each uop will be counted.

     p4-64bit-mmx-uop [,mask=flags]
	     (TI event)	Count MMX instructions that operate on 64 bit SIMD op-
	     erands.  Qualifier	flags can take the following value (which is
	     also the default):

	     all     Count all uops operating on 64 bit	SIMD integer operands
		     in	memory or in MMX registers.

	     If	an instruction contains	more than one 64 bit MMX uop, then
	     each uop will be counted.

     p4-b2b-cycles
	     (TI event)	Count back-to-back bus cycles.	Further	documentation
	     for this event is unavailable.

     p4-bnr  (TI event)	Count bus-not-ready conditions.	 Further documentation
	     for this event is unavailable.

     p4-bpu-fetch-request [,mask=qualifier]
	     (TS event)	Count instruction fetch	requests qualified by addi-
	     tional flags specified in qualifier.  At this point only one flag
	     is	supported:

	     tcmiss  Count trace cache lookup misses.

	     The default qualifier is also ``mask=tcmiss''.

     p4-branch-retired [,mask=flags]
	     (TS event)	Counts retired branches.  Qualifier flags is a list of
	     the following `+' separated strings:

	     mmnp    Count branches not-taken and predicted.
	     mmnm    Count branches not-taken and mis-predicted.
	     mmtp    Count branches taken and predicted.
	     mmtm    Count branches taken and mis-predicted.

	     The default qualifier counts all four kinds of branches.

     p4-bsq-active-entries [,mask=qualifier]
	     (TS event)	Count the number of entries (clipped at	15) currently
	     active in the BSQ.	 Qualifier qualifier is	a `+' separated	set of
	     the following flags:

	     req-type0,	req-type1
		     Forms a 2-bit number used to select the request type
		     encoding:

		     0	     reads excluding read invalidate
		     1	     read invalidates
		     2	     writes other than writebacks
		     3	     writebacks

		     Bit ``req-type1'' is the MSB for this two bit number.
	     req-len0, req-len1
		     Forms a two-bit number that specifies the request length
		     encoding:

		     0	     0 chunks
		     1	     1 chunk
		     3	     8 chunks

		     Bit ``req-len1'' is the MSB for this two bit number.
	     req-io-type
		     Count requests that are input or output requests.
	     req-lock-type
		     Count requests that lock the bus.
	     req-lock-cache
		     Count requests that lock the cache.
	     req-split-type
		     Count requests that is a bus 8-byte chunk that is split
		     across an 8-byte boundary.
	     req-dem-type
		     Count requests that are demand (not prefetches) if	set.
		     Count requests that are prefetches	if not set.
	     req-ord-type
		     Count requests that are ordered.
	     mem-type0,	mem-type1, mem-type2
		     Forms a 3-bit number that specifies a memory type encod-
		     ing:

		     0	     UC
		     1	     USWC
		     4	     WT
		     5	     WP
		     6	     WB

		     Bit ``mem-type2'' is the MSB of this 3-bit	number.

	     The default qualifier has all the above bits set.

	     Edge triggering using the ``edge''	qualifier should not be	used
	     with this event when counting cycles.

     p4-bsq-allocation [,mask=qualifier]
	     (TS event)	Count allocations in the bus sequence unit according
	     to	the flags specified in qualifier, which	is a `+' separated set
	     of	the following flags:

	     req-type0,	req-type1
		     Forms a 2-bit number used to select the request type
		     encoding:

		     0	     reads excluding read invalidate
		     1	     read invalidates
		     2	     writes other than writebacks
		     3	     writebacks

		     Bit ``req-type1'' is the MSB for this two bit number.
	     req-len0, req-len1
		     Forms a two-bit number that specifies the request length
		     encoding:

		     0	     0 chunks
		     1	     1 chunk
		     3	     8 chunks

		     Bit ``req-len1'' is the MSB for this two bit number.
	     req-io-type
		     Count requests that are input or output requests.
	     req-lock-type
		     Count requests that lock the bus.
	     req-lock-cache
		     Count requests that lock the cache.
	     req-split-type
		     Count requests that is a bus 8-byte chunk that is split
		     across an 8-byte boundary.
	     req-dem-type
		     Count requests that are demand (not prefetches) if	set.
		     Count requests that are prefetches	if not set.
	     req-ord-type
		     Count requests that are ordered.
	     mem-type0,	mem-type1, mem-type2
		     Forms a 3-bit number that specifies a memory type encod-
		     ing:

		     0	     UC
		     1	     USWC
		     4	     WT
		     5	     WP
		     6	     WB

		     Bit ``mem-type2'' is the MSB of this 3-bit	number.

	     The default qualifier has all the above bits set.

	     This event	is usually used	along with the ``edge''	qualifier to
	     avoid multiple counting.

     p4-bsq-cache-reference [,mask=qualifier]
	     (TS event)	Count cache references as seen by the bus unit (2nd or
	     3rd level cache references).  Qualifier qualifier is a `+'	sepa-
	     rated list	of the following keywords:

	     rd-2ndl-hits
		     Count 2nd level cache hits	in the shared state.
	     rd-2ndl-hite
		     Count 2nd level cache hits	in the exclusive state.
	     rd-2ndl-hitm
		     Count 2nd level cache hits	in the modified	state.
	     rd-3rdl-hits
		     Count 3rd level cache hits	in the shared state.
	     rd-3rdl-hite
		     Count 3rd level cache hits	in the exclusive state.
	     rd-3rdl-hitm
		     Count 3rd level cache hits	in the modified	state.
	     rd-2ndl-miss
		     Count 2nd level cache misses.
	     rd-3rdl-miss
		     Count 3rd level cache misses.
	     wr-2ndl-miss
		     Count write-back lookups from the data access cache that
		     miss the 2nd level	cache.

	     The default is to count all the above events.

     p4-execution-event	[,mask=flags]
	     (TS event)	Count the retirement of	tagged uops selected through
	     the execution tagging mechanism.  Qualifier flags can contain the
	     following strings separated by `+'	characters:

	     nbogus0, nbogus1, nbogus2,	nbogus3
		     The marked	uops are not bogus.
	     bogus0, bogus1, bogus2, bogus3
		     The marked	uops are bogus.

	     This event	requires additional (upstream) events to be allocated
	     to	perform	the desired uop	tagging.  The default is to set	all
	     the above flags.  This event can be used for precise event	based
	     sampling.

     p4-front-end-event	[,mask=flags]
	     (TS event)	Count the retirement of	tagged uops selected through
	     the front-end tagging mechanism.  Qualifier flags can contain the
	     following strings separated by `+'	characters:

	     nbogus  The marked	uops are not bogus.
	     bogus   The marked	uops are bogus.

	     This event	requires additional (upstream) events to be allocated
	     to	perform	the desired uop	tagging.  The default is to select
	     both kinds	of events.  This event can be used for precise event
	     based sampling.

     p4-fsb-data-activity [,mask=flags]
	     (TI event)	Count each DBSY	or DRDY	event selected by qualifier
	     flags.  Qualifier flags is	a `+' separated	set of the following
	     flags:

	     drdy-drv
		     Count when	this processor is driving data onto the	bus.
	     drdy-own
		     Count when	this processor is reading data from the	bus.
	     drdy-other
		     Count when	data is	on the bus but not being sampled by
		     this processor.
	     dbsy-drv
		     Count when	this processor reserves	the bus	for use	in the
		     next cycle	in order to drive data.
	     dbsy-own
		     Count when	some agent reserves the	bus for	use in the
		     next bus cycle to drive data that this processor will
		     sample.
	     dbsy-other
		     Count when	some agent reserves the	bus for	use in the
		     next bus cycle to drive data that this processor will not
		     sample.

	     Flags ``drdy-own''	and ``drdy-other'' are mutually	exclusive.
	     Flags ``dbsy-own''	and ``dbsy-other'' are mutually	exclusive.
	     The default value for qualifier is
	     ``drdy-drv+drdy-own+dbsy-drv+dbsy-own''.

     p4-global-power-events [,mask=flags]
	     (TS event)	Count cycles during which the processor	is not
	     stopped.  Qualifier flags can take	the following value (which is
	     also the default):

	     running
		     Count cycles when the processor is	active.

     p4-instr-retired [,mask=flags]
	     (TS event)	Count instructions retired during a clock cycle.
	     Qualifier flags comprises of the following	strings	separated by
	     `+' characters:

	     nbogusntag
		     Count non-bogus instructions that are not tagged.
	     nbogustag
		     Count non-bogus instructions that are tagged.
	     bogusntag
		     Count bogus instructions that are not tagged.
	     bogustag
		     Count bogus instructions that are tagged.

	     The default qualifier counts all the above	kinds of instructions.

     p4-ioq-active-entries [,mask=qualifier] [,busreqtype=req-type]
	     (TS event)	Count the number of entries (clipped at	15) in the IOQ
	     that are active.  The event masks are specified by	qualifier
	     qualifier and req-type.

	     Qualifier qualifier is a `+' separated set	of the following
	     flags:

	     all-read
		     Count read	entries.
	     all-write
		     Count write entries.
	     mem-uc  Count entries accessing un-cacheable memory.
	     mem-wc  Count entries accessing write-combining memory.
	     mem-wt  Count entries accessing write-through memory.
	     mem-wp  Count entries accessing write-protected memory
	     mem-wb  Count entries accessing write-back	memory.
	     own     Count store requests driven by the	processor (i.e., not
		     by	other processors or by DMA).
	     other   Count store requests driven by other processors or	by
		     DMA.
	     prefetch
		     Include hardware and software prefetch requests in	the
		     count.

	     The default value for qualifier is	to enable all the above	flags.

	     The req-type qualifier is a 5-bit number can be additionally used
	     to	select a specific bus request type.  The default is 0.

	     The ``edge'' qualifier should not be used when counting cycles
	     with this event.  The exact behavior of this event	depends	on the
	     processor revision.

     p4-ioq-allocation [,mask=qualifier] [,busreqtype=req-type]
	     (TS event)	Count various types of transactions on the bus match-
	     ing the flags set in qualifier and	req-type.

	     Qualifier qualifier is a `+' separated set	of the following
	     flags:

	     all-read
		     Count read	entries.
	     all-write
		     Count write entries.
	     mem-uc  Count entries accessing un-cacheable memory.
	     mem-wc  Count entries accessing write-combining memory.
	     mem-wt  Count entries accessing write-through memory.
	     mem-wp  Count entries accessing write-protected memory
	     mem-wb  Count entries accessing write-back	memory.
	     own     Count store requests driven by the	processor (i.e., not
		     by	other processors or by DMA).
	     other   Count store requests driven by other processors or	by
		     DMA.
	     prefetch
		     Include hardware and software prefetch requests in	the
		     count.

	     The default value for qualifier is	to enable all the above	flags.

	     The req-type qualifier is a 5-bit number can be additionally used
	     to	select a specific bus request type.  The default is 0.

	     The ``edge'' qualifier is normally	used with this event to	pre-
	     vent multiple counting.  The exact	behavior of this event depends
	     on	the processor revision.

     p4-itlb-reference [mask=qualifier]
	     (TS event)	Count translations using the instruction translation
	     look-aside	buffer.	 The qualifier argument	is a list of the fol-
	     lowing strings separated by `+' characters.

	     hit     Count ITLB	hits.
	     miss    Count ITLB	misses.
	     hit-uc  Count un-cacheable	ITLB hits.

	     If	no qualifier is	specified the default is to count all the
	     three kinds of ITLB translations.

     p4-load-port-replay [,mask=qualifier]
	     (TS event)	Count replayed events at the load port.	 Qualifier
	     qualifier can take	on one value:

	     split-ld
		     Count split loads.

	     The default value for qualifier is	``split-ld''.

     p4-mispred-branch-retired [,mask=flags]
	     (TS event)	Count mispredicted IA-32 branch	instructions.  Quali-
	     fier flags	can take the following value (which is also the
	     default):

	     nbogus  Count non-bogus retired branch instructions.

     p4-machine-clear [,mask=flags]
	     (TS event)	Count the number of pipeline clears seen by the	pro-
	     cessor.  Qualifier	flags is a list	of the following strings sepa-
	     rated by `+' characters:

	     clear   Count for a portion of the	many cycles when the machine
		     is	being cleared for any reason.
	     moclear
		     Count machine clears due to memory	ordering issues.
	     smclear
		     Count machine clears due to self-modifying	code.

	     Use qualifier ``edge'' to get a count of occurrences of machine
	     clears.  The default qualifier is ``clear''.

     p4-memory-cancel [,mask=event-list]
	     (TS event)	Count the canceling of various kinds of	requests in
	     the data cache address control unit of the	CPU.  The qualifier
	     event-list	is a list of the following strings separated by	`+'
	     characters:

	     st-rb-full
		     Requests cancelled	because	no store request buffer	was
		     available.
	     64k-conf
		     Requests that conflict due	to 64K aliasing.

	     If	event-list is not specified, then the default is to count both
	     kinds of events.

     p4-memory-complete	[,mask=event-list]
	     (TS event)	Count the completion of	load split, store split, un-
	     cacheable split and un-cacheable load operations selected by
	     qualifier event-list.  The	qualifier event-list is	a `+' sepa-
	     rated list	of the following flags:

	     lsc     Count load	splits completed, excluding loads from un-
		     cacheable or write-combining areas.
	     ssc     Count any split stores completed.

	     The default is to count both kinds	of operations.

     p4-mob-load-replay	[,mask=qualifier]
	     (TS event)	Count load replays triggered by	the memory order
	     buffer.  Qualifier	qualifier can be a `+' separated list of the
	     following flags:

	     no-sta  Count replays because of unknown store addresses.
	     no-std  Count replays because of unknown store data.
	     partial-data
		     Count replays because of partially	overlapped data
		     accesses between load and store operations.
	     unalgn-addr
		     Count replays because of mismatches in the	lower 4	bits
		     of	load and store operations.

	     The default qualifier is no-sta+no-std+partial-data+unalgn-addr.

     p4-packed-dp-uop [,mask=flags]
	     (TI event)	Count packed double-precision uops.  Qualifier flags
	     can take the following value (which is also the default):

	     all     Count all uops operating on packed	double-precision oper-
		     ands.

     p4-packed-sp-uop [,mask=flags]
	     (TI event)	Count packed single-precision uops.  Qualifier flags
	     can take the following value (which is also the default):

	     all     Count all uops operating on packed	single-precision oper-
		     ands.

     p4-page-walk-type [,mask=qualifier]
	     (TI event)	Count page walks performed by the page miss handler.
	     Qualifier qualifier can be	a `+' separated	list of	the following
	     keywords:

	     dtmiss  Count page	walks for data TLB misses.
	     itmiss  Count page	walks for instruction TLB misses.

	     The default value for qualifier is	``dtmiss+itmiss''.

     p4-replay-event [,mask=flags]
	     (TS event)	Count the retirement of	tagged uops selected through
	     the replay	tagging	mechanism.  Qualifier flags contains a `+'
	     separated set of the following strings:

	     nbogus  The marked	uops are not bogus.
	     bogus   The marked	uops are bogus.

	     This event	requires additional (upstream) events to be allocated
	     to	perform	the desired uop	tagging.  The default qualifier	counts
	     both kinds	of uops.  This event can be used for precise event
	     based sampling.

     p4-resource-stall [,mask=flags]
	     (TS event)	Count the occurrence or	latency	of stalls in the allo-
	     cator.  Qualifier flags can take the following value (which is
	     also the default):

	     sbfull  A stall due to the	lack of	store buffers.

     p4-response
	     (TI event)	Count different	types of responses.  Further documen-
	     tation on this event is not available.

     p4-retired-branch-type [,mask=flags]
	     (TS event)	Count branches retired.	 Qualifier flags contains a
	     `+' separated list	of strings:

	     conditional
		     Count conditional jumps.
	     call    Count direct and indirect call branches.
	     return  Count return branches.
	     indirect
		     Count returns, indirect calls or indirect jumps.

	     The default qualifier counts all the above	branch types.

     p4-retired-mispred-branch-type [,mask=flags]
	     (TS event)	Count mispredicted branches retired.  Qualifier	flags
	     contains a	`+' separated list of strings:

	     conditional
		     Count conditional jumps.
	     call    Count indirect call branches.
	     return  Count return branches.
	     indirect
		     Count returns, indirect calls or indirect jumps.

	     The default qualifier counts all the above	branch types.

     p4-scalar-dp-uop [,mask=flags]
	     (TI event)	Count the number of scalar double-precision uops.
	     Qualifier flags can take the following value (which is also the
	     default):

	     all     Count the number of scalar	double-precision uops.

     p4-scalar-sp-uop [,mask=flags]
	     (TI event)	Count the number of scalar single-precision uops.
	     Qualifier flags can take the following value (which is also the
	     default):

	     all     Count all uops operating on scalar	single-precision oper-
		     ands.

     p4-snoop
	     (TI event)	Count snoop traffic.  Further documentation on this
	     event is not available.

     p4-sse-input-assist [,mask=flags]
	     (TI event)	Count the number of times an assist is required	to
	     handle problems with the operands for SSE and SSE2	operations.
	     Qualifier flags can take the following value (which is also the
	     default):

	     all     Count assists for all SSE and SSE2	uops.

     p4-store-port-replay [,mask=qualifier]
	     (TS event)	Count events replayed at the store port.  Qualifier
	     qualifier can take	on one value:

	     split-st
		     Count split stores.

	     The default value for qualifier is	``split-st''.

     p4-tc-deliver-mode	[,mask=qualifier]
	     (TI event)	Count the duration in cycles of	operating modes	of the
	     trace cache and decode engine.  The desired operating mode	is
	     selected by qualifier, which is a list of the following strings
	     separated by `+' characters:

	     DD	     Both logical processors are in deliver mode.
	     DB	     Logical processor 0 is in deliver mode while logical pro-
		     cessor 1 is in build mode.
	     DI	     Logical processor 0 is in deliver mode while logical pro-
		     cessor 1 is halted, or in machine clear, or transitioning
		     to	a long microcode flow.
	     BD	     Logical processor 0 is in build mode while	logical	pro-
		     cessor 1 is in deliver mode.
	     BB	     Both logical processors are in build mode.
	     BI	     Logical processor 0 is in build mode while	logical	pro-
		     cessor 1 is halted, or in machine clear or	transitioning
		     to	a long microcode flow.
	     ID	     Logical processor 0 is halted, or in machine clear	or
		     transitioning to a	long microcode flow while logical pro-
		     cessor 1 is in deliver mode.
	     IB	     Logical processor 0 is halted, or in machine clear	or
		     transitioning to a	long microcode flow while logical pro-
		     cessor 1 is in build mode.

	     If	there is only one logical processor in the processor package
	     then the qualifier	for logical processor 1	is ignored.  If	no
	     qualifier is specified, the default qualifier is
	     ``DD+DB+DI+BD+BB+BI+ID+IB''.

     p4-tc-ms-xfer [,mask=flags]
	     (TI event)	Count the number of times uop delivery changed from
	     the trace cache to	MS ROM.	 Qualifier flags can take the follow-
	     ing value (which is also the default):

	     cisc    Count TC to MS transfers.

     p4-uop-queue-writes [,mask=flags]
	     (TS event)	Count the number of valid uops written to the uop
	     queue.  Qualifier flags is	a list of the following	strings, sepa-
	     rated by `+' characters:

	     from-tc-build
		     Count uops	being written from the trace cache in build
		     mode.
	     from-tc-deliver
		     Count uops	being written from the trace cache in deliver
		     mode.
	     from-rom
		     Count uops	being written from microcode ROM.

	     The default qualifier counts all the above	kinds of uops.

     p4-uop-type [,mask=flags]
	     (TS event)	This event is used in conjunction with the front-end
	     at-retirement mechanism to	tag load and store uops.  Qualifier
	     flags comprises the following strings separated by	`+' charac-
	     ters:

	     tagloads
		     Mark uops that are	load operations.
	     tagstores
		     Mark uops that are	store operations.

	     The default qualifier counts both kinds of	uops.

     p4-uops-retired [,mask=flags]
	     (TS event)	Count uops retired during a clock cycle.  Qualifier
	     flags comprises the following strings separated by	`+' charac-
	     ters:

	     nbogus  Count marked uops that are	not bogus.
	     bogus   Count marked uops that are	bogus.

	     The default qualifier counts both kinds of	uops.

     p4-wc-buffer [,mask=flags]
	     (TI event)	Count write-combining buffer operations.  Qualifier
	     flags contains the	following strings separated by `+' characters:

	     wcb-evicts
		     WC	buffer evictions due to	any cause.
	     wcb-full-evict
		     WC	buffer evictions due to	no WC buffer being available.

	     The default qualifier counts both kinds of	evictions.

     p4-x87-assist [,mask=flags]
	     (TS event)	Count the retirement of	x87 instructions that required
	     special handling.	Qualifier flags	contains the following strings
	     separated by `+' characters:

	     fpsu    Count instructions	that saw an FP stack underflow.
	     fpso    Count instructions	that saw an FP stack overflow.
	     poao    Count instructions	that saw an x87	output overflow.
	     poau    Count instructions	that saw an x87	output underflow.
	     prea    Count instructions	that needed an x87 input assist.

	     The default qualifier counts all the above	types of instruction
	     retirements.

     p4-x87-fp-uop [,mask=flags]
	     (TI event)	Count x87 floating-point uops.	Qualifier flags	can
	     take the following	value (which is	also the default):

	     all     Count all x87 floating-point uops.

	     If	an instruction contains	more than one x87 floating-point uops,
	     then all x87 floating-point uops will be counted.	This event
	     does not count x87	floating-point data movement operations.

     p4-x87-simd-moves-uop [,mask=flags]
	     (TI event)	Count each x87 FPU, MMX, SSE, or SSE2 uops that	load
	     data or store data	or perform register-to-register	moves.	This
	     event does	not count integer move uops.  Qualifier	flags may con-
	     tain the following	keywords separated by `+' characters:

	     allp0   Count all x87 and SIMD store and move uops.
	     allp2   Count all x87 and SIMD load uops.

	     The default is to count all uops.	(Errata) This event may	be
	     affected by processor errata N43.

   Cascading P4	PMCs
     PMC cascading support is currently	poorly implemented.  While individual
     event counters may	be allocated with a ``cascade''	qualifier, the current
     API does not offer	the ability to name and	allocate all the resources
     needed for	a cascaded event counter pair in a single operation.

   Precise Event Based Sampling
     Support for precise event based sampling is currently unimplemented.

   Event Name Aliases
     The following table shows the mapping between the PMC-independent aliases
     supported by Performance Monitoring Counters Interface Library (libpmc,
     -lpmc) and	the underlying hardware	events used.

     Alias		   Event
     branches		   p4-branch-retired,mask=mmtp+mmtm
     branch-mispredicts	   p4-mispred-branch-retired
     dc-misses		   (unsupported)
     ic-misses		   (unsupported)
     instructions	   p4-instr-retired,mask=nbogusntag+nbogustag
     interrupts		   (unsupported)
     unhalted-cycles	   p4-global-power-events

SEE ALSO
     pmc(3), pmc.atom(3), pmc.core(3), pmc.core2(3), pmc.iaf(3), pmc.k7(3),
     pmc.k8(3),	pmc.p5(3), pmc.p6(3), pmc.soft(3), pmc.tsc(3), pmclog(3),
     hwpmc(4)

HISTORY
     The pmc library first appeared in FreeBSD 6.0.

AUTHORS
     The Performance Monitoring	Counters Interface Library (libpmc, -lpmc)
     library was written by Joseph Koshy <jkoshy@FreeBSD.org>.

FreeBSD	10.1			October	4, 2008			  FreeBSD 10.1

NAME | LIBRARY | SYNOPSIS | DESCRIPTION | SEE ALSO | HISTORY | AUTHORS

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=pmc.p4&sektion=3&manpath=FreeBSD+9.2-RELEASE>

home | help