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PMC.WESTMERE(3)		 BSD Library Functions Manual	       PMC.WESTMERE(3)

NAME
     pmc.westmere — measurement events for Intel Westmere family CPUs

LIBRARY
     Performance Counters Library (libpmc, -lpmc)

SYNOPSIS
     #include <pmc.h>

DESCRIPTION
     Intel Westmere CPUs contain PMCs conforming to version 2 of the Intel
     performance measurement architecture.  These CPUs may contain up to three
     classes of PMCs:

     PMC_CLASS_IAF     Fixed-function counters that count only one hardware
		       event per counter.

     PMC_CLASS_IAP     Programmable counters that may be configured to count
		       one of a defined set of hardware events.

     The number of PMCs available in each class and their widths need to be
     determined at run time by calling pmc_cpuinfo(3).

     Intel Westmere PMCs are documented in "Volume 3B: System Programming
     Guide, Part 2", Intel(R) 64 and IA-32 Architectures Software Developes
     Manual, Order Number: 253669-033US, Intel Corporation, December 2009.

   WESTMERE FIXED FUNCTION PMCS
     These PMCs and their supported events are documented in pmc.iaf(3).

   WESTMERE PROGRAMMABLE PMCS
     The programmable PMCs support the following capabilities:

     Capability		  Support
     PMC_CAP_CASCADE	  No
     PMC_CAP_EDGE	  Yes
     PMC_CAP_INTERRUPT	  Yes
     PMC_CAP_INVERT	  Yes
     PMC_CAP_READ	  Yes
     PMC_CAP_PRECISE	  No
     PMC_CAP_SYSTEM	  Yes
     PMC_CAP_TAGGING	  No
     PMC_CAP_THRESHOLD	  Yes
     PMC_CAP_USER	  Yes
     PMC_CAP_WRITE	  Yes

   Event Qualifiers
     Event specifiers for these PMCs support the following common qualifiers:

     rsp=value
	     Configure the Off-core Response bits.

	     DMND_DATA_RD
		     Counts the number of demand and DCU prefetch data reads
		     of full and partial cachelines as well as demand data
		     page table entry cacheline reads. Does not count L2 data
		     read prefetches or instruction fetches.

	     DMND_RFO
		     Counts the number of demand and DCU prefetch reads for
		     ownership (RFO) requests generated by a write to data
		     cacheline. Does not count L2 RFO.

	     DMND_IFETCH
		     Counts the number of demand and DCU prefetch instruction
		     cacheline reads. Does not count L2 code read prefetches.
		     WB Counts the number of writeback (modified to exclusive)
		     transactions.

	     PF_DATA_RD
		     Counts the number of data cacheline reads generated by L2
		     prefetchers.

	     PF_RFO  Counts the number of RFO requests generated by L2
		     prefetchers.

	     PF_IFETCH
		     Counts the number of code reads generated by L2 prefetch‐
		     ers.

	     OTHER   Counts one of the following transaction types, including
		     L3 invalidate, I/O, full or partial writes, WC or non-
		     temporal stores, CLFLUSH, Fences, lock, unlock, split
		     lock.

	     UNCORE_HIT
		     L3 Hit: local or remote home requests that hit L3 cache
		     in the uncore with no coherency actions required (snoop‐
		     ing).

	     OTHER_CORE_HIT_SNP
		     L3 Hit: local or remote home requests that hit L3 cache
		     in the uncore and was serviced by another core with a
		     cross core snoop where no modified copies were found
		     (clean).

	     OTHER_CORE_HITM
		     L3 Hit: local or remote home requests that hit L3 cache
		     in the uncore and was serviced by another core with a
		     cross core snoop where modified copies were found (HITM).

	     REMOTE_CACHE_FWD
		     L3 Miss: local homed requests that missed the L3 cache
		     and was serviced by forwarded data following a cross
		     package snoop where no modified copies found. (Remote
		     home requests are not counted)

	     REMOTE_DRAM
		     L3 Miss: remote home requests that missed the L3 cache
		     and were serviced by remote DRAM.

	     LOCAL_DRAM
		     L3 Miss: local home requests that missed the L3 cache and
		     were serviced by local DRAM.

	     NON_DRAM
		     Non-DRAM requests that were serviced by IOH.

     cmask=value
	     Configure the PMC to increment only if the number of configured
	     events measured in a cycle is greater than or equal to value.

     edge    Configure the PMC to count the number of de-asserted to asserted
	     transitions of the conditions expressed by the other qualifiers.
	     If specified, the counter will increment only once whenever a
	     condition becomes true, irrespective of the number of clocks dur‐
	     ing which the condition remains true.

     inv     Invert the sense of comparison when the “cmask” qualifier is
	     present, making the counter increment when the number of events
	     per cycle is less than the value specified by the “cmask” quali‐
	     fier.

     os	     Configure the PMC to count events happening at processor privi‐
	     lege level 0.

     usr     Configure the PMC to count events occurring at privilege levels
	     1, 2 or 3.

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

   Event Specifiers (Programmable PMCs)
     Westmere programmable PMCs support the following events:

     LOAD_BLOCK.OVERLAP_STORE
	     (Event 03H, Umask 02H) Loads that partially overlap an earlier
	     store

     SB_DRAIN.ANY
	     (Event 04H, Umask 07H) All Store buffer stall cycles

     MISALIGN_MEMORY.STORE
	     (Event 05H, Umask 02H) All store referenced with misaligned
	     address

     STORE_BLOCKS.AT_RET
	     (Event 06H, Umask 04H) Counts number of loads delayed with at-
	     Retirement block code. The following loads need to be executed at
	     retirement and wait for all senior stores on the same thread to
	     be drained: load splitting across 4K boundary (page split), load
	     accessing uncacheable (UC or USWC) memory, load lock, and load
	     with page table in UC or USWC memory region.

     STORE_BLOCKS.L1D_BLOCK
	     (Event 06H, Umask 08H) Cacheable loads delayed with L1D block
	     code

     PARTIAL_ADDRESS_ALIAS
	     (Event 07H, Umask 01H) Counts false dependency due to partial
	     address aliasing

     DTLB_LOAD_MISSES.ANY
	     (Event 08H, Umask 01H) Counts all load misses that cause a page
	     walk

     DTLB_LOAD_MISSES.WALK_COMPLETED
	     (Event 08H, Umask 02H) Counts number of completed page walks due
	     to load miss in the STLB.

     DTLB_LOAD_MISSES.WALK_CYCLES
	     (Event 08H, Umask 04H) Cycles PMH is busy with a page walk due to
	     a load miss in the STLB.

     DTLB_LOAD_MISSES.STLB_HIT
	     (Event 08H, Umask 10H) Number of cache load STLB hits

     DTLB_LOAD_MISSES.PDE_MISS
	     (Event 08H, Umask 20H) Number of DTLB cache load misses where the
	     low part of the linear to physical address translation was
	     missed.

     MEM_INST_RETIRED.LOADS
	     (Event 0BH, Umask 01H) Counts the number of instructions with an
	     architecturally-visible store retired on the architected path.
	     In conjunction with ld_lat facility

     MEM_INST_RETIRED.STORES
	     (Event 0BH, Umask 02H) Counts the number of instructions with an
	     architecturally-visible store retired on the architected path.
	     In conjunction with ld_lat facility

     MEM_INST_RETIRED.LATENCY_ABOVE_THRESHOLD
	     (Event 0BH, Umask 10H) Counts the number of instructions exceed‐
	     ing the latency specified with ld_lat facility.  In conjunction
	     with ld_lat facility

     MEM_STORE_RETIRED.DTLB_MISS
	     (Event 0CH, Umask 01H) The event counts the number of retired
	     stores that missed the DTLB. The DTLB miss is not counted if the
	     store operation causes a fault. Does not counter prefetches.
	     Counts both primary and secondary misses to the TLB

     UOPS_ISSUED.ANY
	     (Event 0EH, Umask 01H) Counts the number of Uops issued by the
	     Register Allocation Table to the Reservation Station, i.e. the
	     UOPs issued from the front end to the back end.

     UOPS_ISSUED.STALLED_CYCLES
	     (Event 0EH, Umask 01H) Counts the number of cycles no Uops issued
	     by the Register Allocation Table to the Reservation Station, i.e.
	     the UOPs issued from the front end to the back end.  set
	     invert=1, cmask = 1

     UOPS_ISSUED.FUSED
	     (Event 0EH, Umask 02H) Counts the number of fused Uops that were
	     issued from the Register Allocation Table to the Reservation Sta‐
	     tion.

     MEM_UNCORE_RETIRED.LOCAL_HITM
	     (Event 0FH, Umask 02H) Load instructions retired that HIT modi‐
	     fied data in sibling core (Precise Event)

     MEM_UNCORE_RETIRED.LOCAL_DRAM_AND_REMOTE_CACHE_HIT
	     (Event 0FH, Umask 08H) Load instructions retired local dram and
	     remote cache HIT data sources (Precise Event)

     MEM_UNCORE_RETIRED.LOCAL_DRAM
	     (Event 0FH, Umask 10H) Load instructions retired with a data
	     source of local DRAM or locally homed remote cache HITM (Precise
	     Event)

     MEM_UNCORE_RETIRED.REMOTE_DRAM
	     (Event 0FH, Umask 20H) Load instructions retired remote DRAM and
	     remote home-remote cache HITM (Precise Event)

     MEM_UNCORE_RETIRED.UNCACHEABLE
	     (Event 0FH, Umask 80H) Load instructions retired I/O (Precise
	     Event)

     FP_COMP_OPS_EXE.X87
	     (Event 10H, Umask 01H) Counts the number of FP Computational Uops
	     Executed. The number of FADD, FSUB, FCOM, FMULs, integer MULsand
	     IMULs, FDIVs, FPREMs, FSQRTS, integer DIVs, and IDIVs. This event
	     does not distinguish an FADD used in the middle of a transcenden‐
	     tal flow from a separate FADD instruction.

     FP_COMP_OPS_EXE.MMX
	     (Event 10H, Umask 02H) Counts number of MMX Uops executed.

     FP_COMP_OPS_EXE.SSE_FP
	     (Event 10H, Umask 04H) Counts number of SSE and SSE2 FP uops exe‐
	     cuted.

     FP_COMP_OPS_EXE.SSE2_INTEGER
	     (Event 10H, Umask 08H) Counts number of SSE2 integer uops exe‐
	     cuted.

     FP_COMP_OPS_EXE.SSE_FP_PACKED
	     (Event 10H, Umask 10H) Counts number of SSE FP packed uops exe‐
	     cuted.

     FP_COMP_OPS_EXE.SSE_FP_SCALAR
	     (Event 10H, Umask 20H) Counts number of SSE FP scalar uops exe‐
	     cuted.

     FP_COMP_OPS_EXE.SSE_SINGLE_PRECISION
	     (Event 10H, Umask 40H) Counts number of SSE* FP single precision
	     uops executed.

     FP_COMP_OPS_EXE.SSE_DOUBLE_PRECISION
	     (Event 10H, Umask 80H) Counts number of SSE* FP double precision
	     uops executed.

     SIMD_INT_128.PACKED_MPY
	     (Event 12H, Umask 01H) Counts number of 128 bit SIMD integer mul‐
	     tiply operations.

     SIMD_INT_128.PACKED_SHIFT
	     (Event 12H, Umask 02H) Counts number of 128 bit SIMD integer
	     shift operations.

     SIMD_INT_128.PACK
	     (Event 12H, Umask 04H) Counts number of 128 bit SIMD integer pack
	     operations.

     SIMD_INT_128.UNPACK
	     (Event 12H, Umask 08H) Counts number of 128 bit SIMD integer
	     unpack operations.

     SIMD_INT_128.PACKED_LOGICAL
	     (Event 12H, Umask 10H) Counts number of 128 bit SIMD integer log‐
	     ical operations.

     SIMD_INT_128.PACKED_ARITH
	     (Event 12H, Umask 20H) Counts number of 128 bit SIMD integer
	     arithmetic operations.

     SIMD_INT_128.SHUFFLE_MOVE
	     (Event 12H, Umask 40H) Counts number of 128 bit SIMD integer
	     shuffle and move operations.

     LOAD_DISPATCH.RS
	     (Event 13H, Umask 01H) Counts number of loads dispatched from the
	     Reservation Station that bypass the Memory Order Buffer.

     LOAD_DISPATCH.RS_DELAYED
	     (Event 13H, Umask 02H) Counts the number of delayed RS dispatches
	     at the stage latch. If an RS dispatch can not bypass to LB, it
	     has another chance to dispatch from the one-cycle delayed staging
	     latch before it is written into the LB.

     LOAD_DISPATCH.MOB
	     (Event 13H, Umask 04H) Counts the number of loads dispatched from
	     the Reservation Station to the Memory Order Buffer.

     LOAD_DISPATCH.ANY
	     (Event 13H, Umask 07H) Counts all loads dispatched from the
	     Reservation Station.

     ARITH.CYCLES_DIV_BUSY
	     (Event 14H, Umask 01H) Counts the number of cycles the divider is
	     busy executing divide or square root operations. The divide can
	     be integer, X87 or Streaming SIMD Extensions (SSE). The square
	     root operation can be either X87 or SSE.  Set 'edge =1, invert=1,
	     cmask=1' to count the number of divides.  Count may be incorrect
	     When SMT is on

     ARITH.MUL
	     (Event 14H, Umask 02H) Counts the number of multiply operations
	     executed. This includes integer as well as floating point multi‐
	     ply operations but excludes DPPS mul and MPSAD.  Count may be
	     incorrect When SMT is on

     INST_QUEUE_WRITES
	     (Event 17H, Umask 01H) Counts the number of instructions written
	     into the instruction queue every cycle.

     INST_DECODED.DEC0
	     (Event 18H, Umask 01H) Counts number of instructions that require
	     decoder 0 to be decoded. Usually, this means that the instruction
	     maps to more than 1 uop

     TWO_UOP_INSTS_DECODED
	     (Event 19H, Umask 01H) An instruction that generates two uops was
	     decoded

     INST_QUEUE_WRITE_CYCLES
	     (Event 1EH, Umask 01H) This event counts the number of cycles
	     during which instructions are written to the instruction queue.
	     Dividing this counter by the number of instructions written to
	     the instruction queue (INST_QUEUE_WRITES) yields the average num‐
	     ber of instructions decoded each cycle. If this number is less
	     than four and the pipe stalls, this indicates that the decoder is
	     failing to decode enough instructions per cycle to sustain the
	     4-wide pipeline.  If SSE* instructions that are 6 bytes or longer
	     arrive one after another, then front end throughput may limit
	     execution speed. In such case,

     LSD_OVERFLOW
	     (Event 20H, Umask 01H) Number of loops that can not stream from
	     the instruction queue.

     L2_RQSTS.LD_HIT
	     (Event 24H, Umask 01H) Counts number of loads that hit the L2
	     cache. L2 loads include both L1D demand misses as well as L1D
	     prefetches. L2 loads can be rejected for various reasons. Only
	     non rejected loads are counted.

     L2_RQSTS.LD_MISS
	     (Event 24H, Umask 02H) Counts the number of loads that miss the
	     L2 cache. L2 loads include both L1D demand misses as well as L1D
	     prefetches.

     L2_RQSTS.LOADS
	     (Event 24H, Umask 03H) Counts all L2 load requests. L2 loads
	     include both L1D demand misses as well as L1D prefetches.

     L2_RQSTS.RFO_HIT
	     (Event 24H, Umask 04H) Counts the number of store RFO requests
	     that hit the L2 cache. L2 RFO requests include both L1D demand
	     RFO misses as well as L1D RFO prefetches.	Count includes WC mem‐
	     ory requests, where the data is not fetched but the permission to
	     write the line is required.

     L2_RQSTS.RFO_MISS
	     (Event 24H, Umask 08H) Counts the number of store RFO requests
	     that miss the L2 cache. L2 RFO requests include both L1D demand
	     RFO misses as well as L1D RFO prefetches.

     L2_RQSTS.RFOS
	     (Event 24H, Umask 0CH) Counts all L2 store RFO requests. L2 RFO
	     requests include both L1D demand RFO misses as well as L1D RFO
	     prefetches.

     L2_RQSTS.IFETCH_HIT
	     (Event 24H, Umask 10H) Counts number of instruction fetches that
	     hit the L2 cache. L2 instruction fetches include both L1I demand
	     misses as well as L1I instruction prefetches.

     L2_RQSTS.IFETCH_MISS
	     (Event 24H, Umask 20H) Counts number of instruction fetches that
	     miss the L2 cache. L2 instruction fetches include both L1I demand
	     misses as well as L1I instruction prefetches.

     L2_RQSTS.IFETCHES
	     (Event 24H, Umask 30H) Counts all instruction fetches. L2
	     instruction fetches include both L1I demand misses as well as L1I
	     instruction prefetches.

     L2_RQSTS.PREFETCH_HIT
	     (Event 24H, Umask 40H) Counts L2 prefetch hits for both code and
	     data.

     L2_RQSTS.PREFETCH_MISS
	     (Event 24H, Umask 80H) Counts L2 prefetch misses for both code
	     and data.

     L2_RQSTS.PREFETCHES
	     (Event 24H, Umask C0H) Counts all L2 prefetches for both code and
	     data.

     L2_RQSTS.MISS
	     (Event 24H, Umask AAH) Counts all L2 misses for both code and
	     data.

     L2_RQSTS.REFERENCES
	     (Event 24H, Umask FFH) Counts all L2 requests for both code and
	     data.

     L2_DATA_RQSTS.DEMAND.I_STATE
	     (Event 26H, Umask 01H) Counts number of L2 data demand loads
	     where the cache line to be loaded is in the I (invalid) state,
	     i.e. a cache miss. L2 demand loads are both L1D demand misses and
	     L1D prefetches.

     L2_DATA_RQSTS.DEMAND.S_STATE
	     (Event 26H, Umask 02H) Counts number of L2 data demand loads
	     where the cache line to be loaded is in the S (shared) state. L2
	     demand loads are both L1D demand misses and L1D prefetches.

     L2_DATA_RQSTS.DEMAND.E_STATE
	     (Event 26H, Umask 04H) Counts number of L2 data demand loads
	     where the cache line to be loaded is in the E (exclusive) state.
	     L2 demand loads are both L1D demand misses and L1D prefetches.

     L2_DATA_RQSTS.DEMAND.M_STATE
	     (Event 26H, Umask 08H) Counts number of L2 data demand loads
	     where the cache line to be loaded is in the M (modified) state.
	     L2 demand loads are both L1D demand misses and L1D prefetches.

     L2_DATA_RQSTS.DEMAND.MESI
	     (Event 26H, Umask 0FH) Counts all L2 data demand requests. L2
	     demand loads are both L1D demand misses and L1D prefetches.

     L2_DATA_RQSTS.PREFETCH.I_STATE
	     (Event 26H, Umask 10H) Counts number of L2 prefetch data loads
	     where the cache line to be loaded is in the I (invalid) state,
	     i.e. a cache miss.

     L2_DATA_RQSTS.PREFETCH.S_STATE
	     (Event 26H, Umask 20H) Counts number of L2 prefetch data loads
	     where the cache line to be loaded is in the S (shared) state. A
	     prefetch RFO will miss on an S state line, while a prefetch read
	     will hit on an S state line.

     L2_DATA_RQSTS.PREFETCH.E_STATE
	     (Event 26H, Umask 40H) Counts number of L2 prefetch data loads
	     where the cache line to be loaded is in the E (exclusive) state.

     L2_DATA_RQSTS.PREFETCH.M_STATE
	     (Event 26H, Umask 80H) Counts number of L2 prefetch data loads
	     where the cache line to be loaded is in the M (modified) state.

     L2_DATA_RQSTS.PREFETCH.MESI
	     (Event 26H, Umask F0H) Counts all L2 prefetch requests.

     L2_DATA_RQSTS.ANY
	     (Event 26H, Umask FFH) Counts all L2 data requests.

     L2_WRITE.RFO.I_STATE
	     (Event 27H, Umask 01H) Counts number of L2 demand store RFO
	     requests where the cache line to be loaded is in the I (invalid)
	     state, i.e, a cache miss. The L1D prefetcher does not issue a RFO
	     prefetch.	This is a demand RFO request

     L2_WRITE.RFO.S_STATE
	     (Event 27H, Umask 02H) Counts number of L2 store RFO requests
	     where the cache line to be loaded is in the S (shared) state. The
	     L1D prefetcher does not issue a RFO prefetch.  This is a demand
	     RFO request.

     L2_WRITE.RFO.M_STATE
	     (Event 27H, Umask 08H) Counts number of L2 store RFO requests
	     where the cache line to be loaded is in the M (modified) state.
	     The L1D prefetcher does not issue a RFO prefetch.	This is a
	     demand RFO request.

     L2_WRITE.RFO.HIT
	     (Event 27H, Umask 0EH) Counts number of L2 store RFO requests
	     where the cache line to be loaded is in either the S, E or M
	     states. The L1D prefetcher does not issue a RFO prefetch.	This
	     is a demand RFO request

     L2_WRITE.RFO.MESI
	     (Event 27H, Umask 0FH) Counts all L2 store RFO requests.The L1D
	     prefetcher does not issue a RFO prefetch.	This is a demand RFO
	     request.

     L2_WRITE.LOCK.I_STATE
	     (Event 27H, Umask 10H) Counts number of L2 demand lock RFO
	     requests where the cache line to be loaded is in the I (invalid)
	     state, i.e. a cache miss.

     L2_WRITE.LOCK.S_STATE
	     (Event 27H, Umask 20H) Counts number of L2 lock RFO requests
	     where the cache line to be loaded is in the S (shared) state.

     L2_WRITE.LOCK.E_STATE
	     (Event 27H, Umask 40H) Counts number of L2 demand lock RFO
	     requests where the cache line to be loaded is in the E (exclu‐
	     sive) state.

     L2_WRITE.LOCK.M_STATE
	     (Event 27H, Umask 80H) Counts number of L2 demand lock RFO
	     requests where the cache line to be loaded is in the M (modified)
	     state.

     L2_WRITE.LOCK.HIT
	     (Event 27H, Umask E0H) Counts number of L2 demand lock RFO
	     requests where the cache line to be loaded is in either the S, E,
	     or M state.

     L2_WRITE.LOCK.MESI
	     (Event 27H, Umask F0H) Counts all L2 demand lock RFO requests.

     L1D_WB_L2.I_STATE
	     (Event 28H, Umask 01H) Counts number of L1 writebacks to the L2
	     where the cache line to be written is in the I (invalid) state,
	     i.e. a cache miss.

     L1D_WB_L2.S_STATE
	     (Event 28H, Umask 02H) Counts number of L1 writebacks to the L2
	     where the cache line to be written is in the S state.

     L1D_WB_L2.E_STATE
	     (Event 28H, Umask 04H) Counts number of L1 writebacks to the L2
	     where the cache line to be written is in the E (exclusive) state.

     L1D_WB_L2.M_STATE
	     (Event 28H, Umask 08H) Counts number of L1 writebacks to the L2
	     where the cache line to be written is in the M (modified) state.

     L1D_WB_L2.MESI
	     (Event 28H, Umask 0FH) Counts all L1 writebacks to the L2.

     L3_LAT_CACHE.REFERENCE
	     (Event 2EH, Umask 02H) Counts uncore Last Level Cache references.
	     Because cache hierarchy, cache sizes and other implementation-
	     specific characteristics; value comparison to estimate perfor‐
	     mance differences is not recommended.  See Table A-1.

     L3_LAT_CACHE.MISS
	     (Event 2EH, Umask 01H) Counts uncore Last Level Cache misses.
	     Because cache hierarchy, cache sizes and other implementation-
	     specific characteristics; value comparison to estimate perfor‐
	     mance differences is not recommended.  See Table A-1.

     CPU_CLK_UNHALTED.THREAD_P
	     (Event 3CH, Umask 00H) Counts the number of thread cycles while
	     the thread is not in a halt state.	 The thread enters the halt
	     state when it is running the HLT instruction. The core frequency
	     may change from time to time due to power or thermal throttling.
	     see Table A-1

     CPU_CLK_UNHALTED.REF_P
	     (Event 3CH, Umask 01H) Increments at the frequency of TSC when
	     not halted.  see Table A-1

     DTLB_MISSES.ANY
	     (Event 49H, Umask 01H) Counts the number of misses in the STLB
	     which causes a page walk.

     DTLB_MISSES.WALK_COMPLETED
	     (Event 49H, Umask 02H) Counts number of misses in the STLB which
	     resulted in a completed page walk.

     DTLB_MISSES.WALK_CYCLES
	     (Event 49H, Umask 04H) Counts cycles of page walk due to misses
	     in the STLB.

     DTLB_MISSES.STLB_HIT
	     (Event 49H, Umask 10H) Counts the number of DTLB first level
	     misses that hit in the second level TLB. This event is only rele‐
	     vant if the core contains multiple DTLB levels.

     DTLB_MISSES.LARGE_WALK_COMPLETED
	     (Event 49H, Umask 80H) Counts number of completed large page
	     walks due to misses in the STLB.

     LOAD_HIT_PRE
	     (Event 4CH, Umask 01H) Counts load operations sent to the L1 data
	     cache while a previous SSE prefetch instruction to the same cache
	     line has started prefetching but has not yet finished.

     L1D_PREFETCH.REQUESTS
	     (Event 4EH, Umask 01H) Counts number of hardware prefetch
	     requests dispatched out of the prefetch FIFO.

     L1D_PREFETCH.MISS
	     (Event 4EH, Umask 02H) Counts number of hardware prefetch
	     requests that miss the L1D. There are two prefetchers in the L1D.
	     A streamer, which predicts lines sequentially after this one
	     should be fetched, and the IP prefetcher that remembers access
	     patterns for the current instruction. The streamer prefetcher
	     stops on an L1D hit, while the IP prefetcher does not.

     L1D_PREFETCH.TRIGGERS
	     (Event 4EH, Umask 04H) Counts number of prefetch requests trig‐
	     gered by the Finite State Machine and pushed into the prefetch
	     FIFO. Some of the prefetch requests are dropped due to overwrites
	     or competition between the IP index prefetcher and streamer
	     prefetcher. The prefetch FIFO contains 4 entries.

     EPT.WALK_CYCLES
	     (Event 4FH, Umask 10H) Counts Extended Page walk cycles.

     L1D.REPL
	     (Event 51H, Umask 01H) Counts the number of lines brought into
	     the L1 data cache.	 Counter 0, 1 only.

     L1D.M_REPL
	     (Event 51H, Umask 02H) Counts the number of modified lines
	     brought into the L1 data cache.  Counter 0, 1 only.

     L1D.M_EVICT
	     (Event 51H, Umask 04H) Counts the number of modified lines
	     evicted from the L1 data cache due to replacement.	 Counter 0, 1
	     only.

     L1D.M_SNOOP_EVICT
	     (Event 51H, Umask 08H) Counts the number of modified lines
	     evicted from the L1 data cache due to snoop HITM intervention.
	     Counter 0, 1 only

     L1D_CACHE_PREFETCH_LOCK_FB_HIT
	     (Event 52H, Umask 01H) Counts the number of cacheable load lock
	     speculated instructions accepted into the fill buffer.

     L1D_CACHE_LOCK_FB_HIT
	     (Event 53H, Umask 01H) Counts the number of cacheable load lock
	     speculated or retired instructions accepted into the fill buffer.

     OFFCORE_REQUESTS_OUTSTANDING.DEMAND.READ_DATA
	     (Event 60H, Umask 01H) Counts weighted cycles of offcore demand
	     data read requests. Does not include L2 prefetch requests.
	     Counter 0.

     OFFCORE_REQUESTS_OUTSTANDING.DEMAND.READ_CODE
	     (Event 60H, Umask 02H) Counts weighted cycles of offcore demand
	     code read requests. Does not include L2 prefetch requests.
	     Counter 0.

     OFFCORE_REQUESTS_OUTSTANDING.DEMAND.RFO
	     (Event 60H, Umask 04H) Counts weighted cycles of offcore demand
	     RFO requests. Does not include L2 prefetch requests.  Counter 0.

     OFFCORE_REQUESTS_OUTSTANDING.ANY.READ
	     (Event 60H, Umask 08H) Counts weighted cycles of offcore read
	     requests of any kind. Include L2 prefetch requests.  Ccounter 0.

     CACHE_LOCK_CYCLES.L1D_L2
	     (Event 63H, Umask 01H) Cycle count during which the L1D and L2
	     are locked. A lock is asserted when there is a locked memory
	     access, due to uncacheable memory, a locked operation that spans
	     two cache lines, or a page walk from an uncacheable page table.
	     Counter 0, 1 only. L1D and L2 locks have a very high performance
	     penalty and it is highly recommended to avoid such accesses.

     CACHE_LOCK_CYCLES.L1D
	     (Event 63H, Umask 02H) Counts the number of cycles that cacheline
	     in the L1 data cache unit is locked.  Counter 0, 1 only.

     IO_TRANSACTIONS
	     (Event 6CH, Umask 01H) Counts the number of completed I/O trans‐
	     actions.

     L1I.HITS
	     (Event 80H, Umask 01H) Counts all instruction fetches that hit
	     the L1 instruction cache.

     L1I.MISSES
	     (Event 80H, Umask 02H) Counts all instruction fetches that miss
	     the L1I cache. This includes instruction cache misses, streaming
	     buffer misses, victim cache misses and uncacheable fetches. An
	     instruction fetch miss is counted only once and not once for
	     every cycle it is outstanding.

     L1I.READS
	     (Event 80H, Umask 03H) Counts all instruction fetches, including
	     uncacheable fetches that bypass the L1I.

     L1I.CYCLES_STALLED
	     (Event 80H, Umask 04H) Cycle counts for which an instruction
	     fetch stalls due to a L1I cache miss, ITLB miss or ITLB fault.

     LARGE_ITLB.HIT
	     (Event 82H, Umask 01H) Counts number of large ITLB hits.

     ITLB_MISSES.ANY
	     (Event 85H, Umask 01H) Counts the number of misses in all levels
	     of the ITLB which causes a page walk.

     ITLB_MISSES.WALK_COMPLETED
	     (Event 85H, Umask 02H) Counts number of misses in all levels of
	     the ITLB which resulted in a completed page walk.

     ITLB_MISSES.WALK_CYCLES
	     (Event 85H, Umask 04H) Counts ITLB miss page walk cycles.

     ITLB_MISSES.LARGE_WALK_COMPLETED
	     (Event 85H, Umask 80H) Counts number of completed large page
	     walks due to misses in the STLB.

     ILD_STALL.LCP
	     (Event 87H, Umask 01H) Cycles Instruction Length Decoder stalls
	     due to length changing prefixes: 66, 67 or REX.W (for EM64T)
	     instructions which change the length of the decoded instruction.

     ILD_STALL.MRU
	     (Event 87H, Umask 02H) Instruction Length Decoder stall cycles
	     due to Brand Prediction Unit (PBU) Most Recently Used (MRU)
	     bypass.

     ILD_STALL.IQ_FULL
	     (Event 87H, Umask 04H) Stall cycles due to a full instruction
	     queue.

     ILD_STALL.REGEN
	     (Event 87H, Umask 08H) Counts the number of regen stalls.

     ILD_STALL.ANY
	     (Event 87H, Umask 0FH) Counts any cycles the Instruction Length
	     Decoder is stalled.

     BR_INST_EXEC.COND
	     (Event 88H, Umask 01H) Counts the number of conditional near
	     branch instructions executed, but not necessarily retired.

     BR_INST_EXEC.DIRECT
	     (Event 88H, Umask 02H) Counts all unconditional near branch
	     instructions excluding calls and indirect branches.

     BR_INST_EXEC.INDIRECT_NON_CALL
	     (Event 88H, Umask 04H) Counts the number of executed indirect
	     near branch instructions that are not calls.

     BR_INST_EXEC.NON_CALLS
	     (Event 88H, Umask 07H) Counts all non call near branch instruc‐
	     tions executed, but not necessarily retired.

     BR_INST_EXEC.RETURN_NEAR
	     (Event 88H, Umask 08H) Counts indirect near branches that have a
	     return mnemonic.

     BR_INST_EXEC.DIRECT_NEAR_CALL
	     (Event 88H, Umask 10H) Counts unconditional near call branch
	     instructions, excluding non call branch, executed.

     BR_INST_EXEC.INDIRECT_NEAR_CALL
	     (Event 88H, Umask 20H) Counts indirect near calls, including both
	     register and memory indirect, executed.

     BR_INST_EXEC.NEAR_CALLS
	     (Event 88H, Umask 30H) Counts all near call branches executed,
	     but not necessarily retired.

     BR_INST_EXEC.TAKEN
	     (Event 88H, Umask 40H) Counts taken near branches executed, but
	     not necessarily retired.

     BR_INST_EXEC.ANY
	     (Event 88H, Umask 7FH) Counts all near executed branches (not
	     necessarily retired). This includes only instructions and not
	     micro-op branches. Frequent branching is not necessarily a major
	     performance issue. However frequent branch mispredictions may be
	     a problem.

     BR_MISP_EXEC.COND
	     (Event 89H, Umask 01H) Counts the number of mispredicted condi‐
	     tional near branch instructions executed, but not necessarily
	     retired.

     BR_MISP_EXEC.DIRECT
	     (Event 89H, Umask 02H) Counts mispredicted macro unconditional
	     near branch instructions, excluding calls and indirect branches
	     (should always be 0).

     BR_MISP_EXEC.INDIRECT_NON_CALL
	     (Event 89H, Umask 04H) Counts the number of executed mispredicted
	     indirect near branch instructions that are not calls.

     BR_MISP_EXEC.NON_CALLS
	     (Event 89H, Umask 07H) Counts mispredicted non call near branches
	     executed, but not necessarily retired.

     BR_MISP_EXEC.RETURN_NEAR
	     (Event 89H, Umask 08H) Counts mispredicted indirect branches that
	     have a rear return mnemonic.

     BR_MISP_EXEC.DIRECT_NEAR_CALL
	     (Event 89H, Umask 10H) Counts mispredicted non-indirect near
	     calls executed, (should always be 0).

     BR_MISP_EXEC.INDIRECT_NEAR_CALL
	     (Event 89H, Umask 20H) Counts mispredicted indirect near calls
	     exeucted, including both register and memory indirect.

     BR_MISP_EXEC.NEAR_CALLS
	     (Event 89H, Umask 30H) Counts all mispredicted near call branches
	     executed, but not necessarily retired.

     BR_MISP_EXEC.TAKEN
	     (Event 89H, Umask 40H) Counts executed mispredicted near branches
	     that are taken, but not necessarily retired.

     BR_MISP_EXEC.ANY
	     (Event 89H, Umask 7FH) Counts the number of mispredicted near
	     branch instructions that were executed, but not necessarily
	     retired.

     RESOURCE_STALLS.ANY
	     (Event A2H, Umask 01H) Counts the number of Allocator resource
	     related stalls. Includes register renaming buffer entries, memory
	     buffer entries. In addition to resource related stalls, this
	     event counts some other events. Includes stalls arising during
	     branch misprediction recovery, such as if retirement of the mis‐
	     predicted branch is delayed and stalls arising while store buffer
	     is draining from synchronizing operations.	 Does not include
	     stalls due to SuperQ (off core) queue full, too many cache
	     misses, etc.

     RESOURCE_STALLS.LOAD
	     (Event A2H, Umask 02H) Counts the cycles of stall due to lack of
	     load buffer for load operation.

     RESOURCE_STALLS.RS_FULL
	     (Event A2H, Umask 04H) This event counts the number of cycles
	     when the number of instructions in the pipeline waiting for exe‐
	     cution reaches the limit the processor can handle. A high count
	     of this event indicates that there are long latency operations in
	     the pipe (possibly load and store operations that miss the L2
	     cache, or instructions dependent upon instructions further down
	     the pipeline that have yet to retire.  When RS is full, new
	     instructions can not enter the reservation station and start exe‐
	     cution.

     RESOURCE_STALLS.STORE
	     (Event A2H, Umask 08H) This event counts the number of cycles
	     that a resource related stall will occur due to the number of
	     store instructions reaching the limit of the pipeline, (i.e. all
	     store buffers are used). The stall ends when a store instruction
	     commits its data to the cache or memory.

     RESOURCE_STALLS.ROB_FULL
	     (Event A2H, Umask 10H) Counts the cycles of stall due to re-
	     order buffer full.

     RESOURCE_STALLS.FPCW
	     (Event A2H, Umask 20H) Counts the number of cycles while execu‐
	     tion was stalled due to writing the floating-point unit (FPU)
	     control word.

     RESOURCE_STALLS.MXCSR
	     (Event A2H, Umask 40H) Stalls due to the MXCSR register rename
	     occurring to close to a previous MXCSR rename. The MXCSR provides
	     control and status for the MMX registers.

     RESOURCE_STALLS.OTHER
	     (Event A2H, Umask 80H) Counts the number of cycles while execu‐
	     tion was stalled due to other resource issues.

     MACRO_INSTS.FUSIONS_DECODED
	     (Event A6H, Umask 01H) Counts the number of instructions decoded
	     that are macro-fused but not necessarily executed or retired.

     BACLEAR_FORCE_IQ
	     (Event A7H, Umask 01H) Counts number of times a BACLEAR was
	     forced by the Instruction Queue. The IQ is also responsible for
	     providing conditional branch prediciton direction based on a
	     static scheme and dynamic data provided by the L2 Branch Predic‐
	     tion Unit. If the conditional branch target is not found in the
	     Target Array and the IQ predicts that the branch is taken, then
	     the IQ will force the Branch Address Calculator to issue a
	     BACLEAR. Each BACLEAR asserted by the BAC generates approximately
	     an 8 cycle bubble in the instruction fetch pipeline.

     LSD.UOPS
	     (Event A8H, Umask 01H) Counts the number of micro-ops delivered
	     by loop stream detector Use cmask=1 and invert to count cycles

     ITLB_FLUSH
	     (Event AEH, Umask 01H) Counts the number of ITLB flushes

     OFFCORE_REQUESTS.DEMAND.READ_DATA
	     (Event B0H, Umask 01H) Counts number of offcore demand data read
	     requests. Does not count L2 prefetch requests.

     OFFCORE_REQUESTS.DEMAND.READ_CODE
	     (Event B0H, Umask 02H) Counts number of offcore demand code read
	     requests. Does not count L2 prefetch requests.

     OFFCORE_REQUESTS.DEMAND.RFO
	     (Event B0H, Umask 04H) Counts number of offcore demand RFO
	     requests. Does not count L2 prefetch requests.

     OFFCORE_REQUESTS.ANY.READ
	     (Event B0H, Umask 08H) Counts number of offcore read requests.
	     Includes L2 prefetch requests.

     OFFCORE_REQUESTS.ANY.RFO
	     (Event 80H, Umask 10H) Counts number of offcore RFO requests.
	     Includes L2 prefetch requests.

     OFFCORE_REQUESTS.L1D_WRITEBACK
	     (Event B0H, Umask 40H) Counts number of L1D writebacks to the
	     uncore.

     OFFCORE_REQUESTS.ANY
	     (Event B0H, Umask 80H) Counts all offcore requests.

     UOPS_EXECUTED.PORT0
	     (Event B1H, Umask 01H) Counts number of Uops executed that were
	     issued on port 0. Port 0 handles integer arithmetic, SIMD and FP
	     add Uops.

     UOPS_EXECUTED.PORT1
	     (Event B1H, Umask 02H) Counts number of Uops executed that were
	     issued on port 1. Port 1 handles integer arithmetic, SIMD, inte‐
	     ger shift, FP multiply and FP divide Uops.

     UOPS_EXECUTED.PORT2_CORE
	     (Event B1H, Umask 04H) Counts number of Uops executed that were
	     issued on port 2. Port 2 handles the load Uops. This is a core
	     count only and can not be collected per thread.

     UOPS_EXECUTED.PORT3_CORE
	     (Event B1H, Umask 08H) Counts number of Uops executed that were
	     issued on port 3. Port 3 handles store Uops. This is a core count
	     only and can not be collected per thread.

     UOPS_EXECUTED.PORT4_CORE
	     (Event B1H, Umask 10H) Counts number of Uops executed that where
	     issued on port 4. Port 4 handles the value to be stored for the
	     store Uops issued on port 3. This is a core count only and can
	     not be collected per thread.

     UOPS_EXECUTED.CORE_ACTIVE_CYCLES_NO_PORT5
	     (Event B1H, Umask 1FH) Counts number of cycles there are one or
	     more uops being executed and were issued on ports 0-4. This is a
	     core count only and can not be collected per thread.

     UOPS_EXECUTED.PORT5
	     (Event B1H, Umask 20H) Counts number of Uops executed that where
	     issued on port 5.

     UOPS_EXECUTED.CORE_ACTIVE_CYCLES
	     (Event B1H, Umask 3FH) Counts number of cycles there are one or
	     more uops being executed on any ports. This is a core count only
	     and can not be collected per thread.

     UOPS_EXECUTED.PORT015
	     (Event B1H, Umask 40H) Counts number of Uops executed that where
	     issued on port 0, 1, or 5.	 Use cmask=1, invert=1 to count stall
	     cycles.

     UOPS_EXECUTED.PORT234
	     (Event B1H, Umask 80H) Counts number of Uops executed that where
	     issued on port 2, 3, or 4.

     OFFCORE_REQUESTS_SQ_FULL
	     (Event B2H, Umask 01H) Counts number of cycles the SQ is full to
	     handle off-core requests.

     SNOOPQ_REQUESTS_OUTSTANDING.DATA
	     (Event B3H, Umask 01H) Counts weighted cycles of snoopq requests
	     for data. Counter 0 only Use cmask=1 to count cycles not empty.

     SNOOPQ_REQUESTS_OUTSTANDING.INVALIDATE
	     (Event B3H, Umask 02H) Counts weighted cycles of snoopq invali‐
	     date requests. Counter 0 only.  Use cmask=1 to count cycles not
	     empty.

     SNOOPQ_REQUESTS_OUTSTANDING.CODE
	     (Event B3H, Umask 04H) Counts weighted cycles of snoopq requests
	     for code. Counter 0 only.	Use cmask=1 to count cycles not empty.

     SNOOPQ_REQUESTS.CODE
	     (Event B4H, Umask 01H) Counts the number of snoop code requests.

     SNOOPQ_REQUESTS.DATA
	     (Event B4H, Umask 02H) Counts the number of snoop data requests.

     SNOOPQ_REQUESTS.INVALIDATE
	     (Event B4H, Umask 04H) Counts the number of snoop invalidate
	     requests

     OFF_CORE_RESPONSE_0
	     (Event B7H, Umask 01H) see Section 30.6.1.3, Off-core Response
	     Performance Monitoring in the Processor Core.  Requires program‐
	     ming MSR 01A6H.

     SNOOP_RESPONSE.HIT
	     (Event B8H, Umask 01H) Counts HIT snoop response sent by this
	     thread in response to a snoop request.

     SNOOP_RESPONSE.HITE
	     (Event B8H, Umask 02H) Counts HIT E snoop response sent by this
	     thread in response to a snoop request.

     SNOOP_RESPONSE.HITM
	     (Event B8H, Umask 04H) Counts HIT M snoop response sent by this
	     thread in response to a snoop request.

     OFF_CORE_RESPONSE_1
	     (Event BBH, Umask 01H) see Section 30.6.1.3, Off-core Response
	     Performance Monitoring in the Processor Core.  Use MSR 01A7H.

     INST_RETIRED.ANY_P
	     (Event C0H, Umask 01H) See Table A-1 Notes: INST_RETIRED.ANY is
	     counted by a designated fixed counter.  INST_RETIRED.ANY_P is
	     counted by a programmable counter and is an architectural perfor‐
	     mance event. Event is supported if CPUID.A.EBX[1] = 0.  Counting:
	     Faulting executions of GETSEC/VM entry/VM Exit/MWait will not
	     count as retired instructions.

     INST_RETIRED.X87
	     (Event C0H, Umask 02H) Counts the number of floating point compu‐
	     tational operations retired: floating point computational opera‐
	     tions executed by the assist handler and sub-operations of com‐
	     plex floating point instructions like transcendental instruc‐
	     tions.

     INST_RETIRED.MMX
	     (Event C0H, Umask 04H) Counts the number of retired: MMX instruc‐
	     tions.

     UOPS_RETIRED.ANY
	     (Event C2H, Umask 01H) Counts the number of micro-ops retired,
	     (macro-fused=1, micro- fused=2, others=1; maximum count of 8 per
	     cycle). Most instructions are composed of one or two micro-ops.
	     Some instructions are decoded into longer sequences such as
	     repeat instructions, floating point transcendental instructions,
	     and assists.  Use cmask=1 and invert to count active cycles or
	     stalled cycles

     UOPS_RETIRED.RETIRE_SLOTS
	     (Event C2H, Umask 02H) Counts the number of retirement slots used
	     each cycle

     UOPS_RETIRED.MACRO_FUSED
	     (Event C2H, Umask 04H) Counts number of macro-fused uops retired.

     MACHINE_CLEARS.CYCLES
	     (Event C3H, Umask 01H) Counts the cycles machine clear is
	     asserted.

     MACHINE_CLEARS.MEM_ORDER
	     (Event C3H, Umask 02H) Counts the number of machine clears due to
	     memory order conflicts.

     MACHINE_CLEARS.SMC
	     (Event C3H, Umask 04H) Counts the number of times that a program
	     writes to a code section.	Self-modifying code causes a sever
	     penalty in all Intel 64 and IA-32 processors. The modified cache
	     line is written back to the L2 and L3caches.

     BR_INST_RETIRED.ANY_P
	     (Event C4H, Umask 00H) See Table A-1.

     BR_INST_RETIRED.CONDITIONAL
	     (Event C4H, Umask 01H) Counts the number of conditional branch
	     instructions retired.

     BR_INST_RETIRED.NEAR_CALL
	     (Event C4H, Umask 02H) Counts the number of direct & indirect
	     near unconditional calls retired.

     BR_INST_RETIRED.ALL_BRANCHES
	     (Event C4H, Umask 04H) Counts the number of branch instructions
	     retired.

     BR_MISP_RETIRED.ANY_P
	     (Event C5H, Umask 00H) See Table A-1.

     BR_MISP_RETIRED.CONDITIONAL
	     (Event C5H, Umask 01H) Counts mispredicted conditional retired
	     calls.

     BR_MISP_RETIRED.NEAR_CALL
	     (Event C5H, Umask 02H) Counts mispredicted direct & indirect near
	     unconditional retired calls.

     BR_MISP_RETIRED.ALL_BRANCHES
	     (Event C5H, Umask 04H) Counts all mispredicted retired calls.

     SSEX_UOPS_RETIRED.PACKED_SINGLE
	     (Event C7H, Umask 01H) Counts SIMD packed single-precision float‐
	     ing point Uops retired.

     SSEX_UOPS_RETIRED.SCALAR_SINGLE
	     (Event C7H, Umask 02H) Counts SIMD calar single-precision float‐
	     ing point Uops retired.

     SSEX_UOPS_RETIRED.PACKED_DOUBLE
	     (Event C7H, Umask 04H) Counts SIMD packed double- precision
	     floating point Uops retired.

     SSEX_UOPS_RETIRED.SCALAR_DOUBLE
	     (Event C7H, Umask 08H) Counts SIMD scalar double-precision float‐
	     ing point Uops retired.

     SSEX_UOPS_RETIRED.VECTOR_INTEGER
	     (Event C7H, Umask 10H) Counts 128-bit SIMD vector integer Uops
	     retired.

     ITLB_MISS_RETIRED
	     (Event C8H, Umask 20H) Counts the number of retired instructions
	     that missed the ITLB when the instruction was fetched.

     MEM_LOAD_RETIRED.L1D_HIT
	     (Event CBH, Umask 01H) Counts number of retired loads that hit
	     the L1 data cache.

     MEM_LOAD_RETIRED.L2_HIT
	     (Event CBH, Umask 02H) Counts number of retired loads that hit
	     the L2 data cache.

     MEM_LOAD_RETIRED.L3_UNSHARED_HIT
	     (Event CBH, Umask 04H) Counts number of retired loads that hit
	     their own, unshared lines in the L3 cache.

     MEM_LOAD_RETIRED.OTHER_CORE_L2_HIT_HITM
	     (Event CBH, Umask 08H) Counts number of retired loads that hit in
	     a sibling core's L2 (on die core). Since the L3 is inclusive of
	     all cores on the package, this is an L3 hit. This counts both
	     clean or modified hits.

     MEM_LOAD_RETIRED.L3_MISS
	     (Event CBH, Umask 10H) Counts number of retired loads that miss
	     the L3 cache. The load was satisfied by a remote socket, local
	     memory or an IOH.

     MEM_LOAD_RETIRED.HIT_LFB
	     (Event CBH, Umask 40H) Counts number of retired loads that miss
	     the L1D and the address is located in an allocated line fill buf‐
	     fer and will soon be committed to cache. This is counting sec‐
	     ondary L1D misses.

     MEM_LOAD_RETIRED.DTLB_MISS
	     (Event CBH, Umask 80H) Counts the number of retired loads that
	     missed the DTLB. The DTLB miss is not counted if the load opera‐
	     tion causes a fault. This event counts loads from cacheable mem‐
	     ory only. The event does not count loads by software prefetches.
	     Counts both primary and secondary misses to the TLB.

     FP_MMX_TRANS.TO_FP
	     (Event CCH, Umask 01H) Counts the first floating-point instruc‐
	     tion following any MMX instruction.  You can use this event to
	     estimate the penalties for the transitions between floating-point
	     and MMX technology states.

     FP_MMX_TRANS.TO_MMX
	     (Event CCH, Umask 02H) Counts the first MMX instruction following
	     a floating-point instruction. You can use this event to estimate
	     the penalties for the transitions between floating-point and MMX
	     technology states.

     FP_MMX_TRANS.ANY
	     (Event CCH, Umask 03H) Counts all transitions from floating point
	     to MMX instructions and from MMX instructions to floating point
	     instructions. You can use this event to estimate the penalties
	     for the transitions between floating-point and MMX technology
	     states.

     MACRO_INSTS.DECODED
	     (Event D0H, Umask 01H) Counts the number of instructions decoded,
	     (but not necessarily executed or retired).

     UOPS_DECODED.STALL_CYCLES
	     (Event D1H, Umask 01H) Counts the cycles of decoder stalls.

     UOPS_DECODED.MS
	     (Event D1H, Umask 02H) Counts the number of Uops decoded by the
	     Microcode Sequencer, MS. The MS delivers uops when the instruc‐
	     tion is more than 4 uops long or a microcode assist is occurring.

     UOPS_DECODED.ESP_FOLDING
	     (Event D1H, Umask 04H) Counts number of stack pointer (ESP)
	     instructions decoded: push , pop , call , ret, etc. ESP instruc‐
	     tions do not generate a Uop to increment or decrement ESP.
	     Instead, they update an ESP_Offset register that keeps track of
	     the delta to the current value of the ESP register.

     UOPS_DECODED.ESP_SYNC
	     (Event D1H, Umask 08H) Counts number of stack pointer (ESP) sync
	     operations where an ESP instruction is corrected by adding the
	     ESP offset register to the current value of the ESP register.

     RAT_STALLS.FLAGS
	     (Event D2H, Umask 01H) Counts the number of cycles during which
	     execution stalled due to several reasons, one of which is a par‐
	     tial flag register stall. A partial register stall may occur when
	     two conditions are met: 1) an instruction modifies some, but not
	     all, of the flags in the flag register and 2) the next instruc‐
	     tion, which depends on flags, depends on flags that were not mod‐
	     ified by this instruction.

     RAT_STALLS.REGISTERS
	     (Event D2H, Umask 02H) This event counts the number of cycles
	     instruction execution latency became longer than the defined
	     latency because the instruction used a register that was par‐
	     tially written by previous instruction.

     RAT_STALLS.ROB_READ_PORT
	     (Event D2H, Umask 04H) Counts the number of cycles when ROB read
	     port stalls occurred, which did not allow new micro-ops to enter
	     the out-of-order pipeline. Note that, at this stage in the pipe‐
	     line, additional stalls may occur at the same cycle and prevent
	     the stalled micro-ops from entering the pipe. In such a case,
	     micro-ops retry entering the execution pipe in the next cycle and
	     the ROB-read port stall is counted again.

     RAT_STALLS.SCOREBOARD
	     (Event D2H, Umask 08H) Counts the cycles where we stall due to
	     microarchitecturally required serialization. Microcode score‐
	     boarding stalls.

     RAT_STALLS.ANY
	     (Event D2H, Umask 0FH) Counts all Register Allocation Table stall
	     cycles due to: Cycles when ROB read port stalls occurred, which
	     did not allow new micro-ops to enter the execution pipe. Cycles
	     when partial register stalls occurred Cycles when flag stalls
	     occurred Cycles floating-point unit (FPU) status word stalls
	     occurred. To count each of these conditions separately use the
	     events: RAT_STALLS.ROB_READ_PORT, RAT_STALLS.PARTIAL,
	     RAT_STALLS.FLAGS, and RAT_STALLS.FPSW.

     SEG_RENAME_STALLS
	     (Event D4H, Umask 01H) Counts the number of stall cycles due to
	     the lack of renaming resources for the ES, DS, FS, and GS segment
	     registers. If a segment is renamed but not retired and a second
	     update to the same segment occurs, a stall occurs in the front-
	     end of the pipeline until the renamed segment retires.

     ES_REG_RENAMES
	     (Event D5H, Umask 01H) Counts the number of times the ES segment
	     register is renamed.

     UOP_UNFUSION
	     (Event DBH, Umask 01H) Counts unfusion events due to floating
	     point exception to a fused uop.

     BR_INST_DECODED
	     (Event E0H, Umask 01H) Counts the number of branch instructions
	     decoded.

     BPU_MISSED_CALL_RET
	     (Event E5H, Umask 01H) Counts number of times the Branch Predici‐
	     ton Unit missed predicting a call or return branch.

     BACLEAR.CLEAR
	     (Event E6H, Umask 01H) Counts the number of times the front end
	     is resteered, mainly when the Branch Prediction Unit cannot pro‐
	     vide a correct prediction and this is corrected by the Branch
	     Address Calculator at the front end. This can occur if the code
	     has many branches such that they cannot be consumed by the BPU.
	     Each BACLEAR asserted by the BAC generates approximately an 8
	     cycle bubble in the instruction fetch pipeline. The effect on
	     total execution time depends on the surrounding code.

     BACLEAR.BAD_TARGET
	     (Event E6H, Umask 02H) Counts number of Branch Address Calculator
	     clears (BACLEAR) asserted due to conditional branch instructions
	     in which there was a target hit but the direction was wrong. Each
	     BACLEAR asserted by the BAC generates approximately an 8 cycle
	     bubble in the instruction fetch pipeline.

     BPU_CLEARS.EARLY
	     (Event E8H, Umask 01H) Counts early (normal) Branch Prediction
	     Unit clears: BPU predicted a taken branch after incorrectly
	     assuming that it was not taken.  The BPU clear leads to 2 cycle
	     bubble in the Front End.

     BPU_CLEARS.LATE
	     (Event E8H, Umask 02H) Counts late Branch Prediction Unit clears
	     due to Most Recently Used conflicts. The PBU clear leads to a 3
	     cycle bubble in the Front End.

     THREAD_ACTIVE
	     (Event ECH, Umask 01H) Counts cycles threads are active.

     L2_TRANSACTIONS.LOAD
	     (Event F0H, Umask 01H) Counts L2 load operations due to HW
	     prefetch or demand loads.

     L2_TRANSACTIONS.RFO
	     (Event F0H, Umask 02H) Counts L2 RFO operations due to HW
	     prefetch or demand RFOs.

     L2_TRANSACTIONS.IFETCH
	     (Event F0H, Umask 04H) Counts L2 instruction fetch operations due
	     to HW prefetch or demand ifetch.

     L2_TRANSACTIONS.PREFETCH
	     (Event F0H, Umask 08H) Counts L2 prefetch operations.

     L2_TRANSACTIONS.L1D_WB
	     (Event F0H, Umask 10H) Counts L1D writeback operations to the L2.

     L2_TRANSACTIONS.FILL
	     (Event F0H, Umask 20H) Counts L2 cache line fill operations due
	     to load, RFO, L1D writeback or prefetch.

     L2_TRANSACTIONS.WB
	     (Event F0H, Umask 40H) Counts L2 writeback operations to the L3.

     L2_TRANSACTIONS.ANY
	     (Event F0H, Umask 80H) Counts all L2 cache operations.

     L2_LINES_IN.S_STATE
	     (Event F1H, Umask 02H) Counts the number of cache lines allocated
	     in the L2 cache in the S (shared) state.

     L2_LINES_IN.E_STATE
	     (Event F1H, Umask 04H) Counts the number of cache lines allocated
	     in the L2 cache in the E (exclusive) state.

     L2_LINES_IN.ANY
	     (Event F1H, Umask 07H) Counts the number of cache lines allocated
	     in the L2 cache.

     L2_LINES_OUT.DEMAND_CLEAN
	     (Event F2H, Umask 01H) Counts L2 clean cache lines evicted by a
	     demand request.

     L2_LINES_OUT.DEMAND_DIRTY
	     (Event F2H, Umask 02H) Counts L2 dirty (modified) cache lines
	     evicted by a demand request.

     L2_LINES_OUT.PREFETCH_CLEAN
	     (Event F2H, Umask 04H) Counts L2 clean cache line evicted by a
	     prefetch request.

     L2_LINES_OUT.PREFETCH_DIRTY
	     (Event F2H, Umask 08H) Counts L2 modified cache line evicted by a
	     prefetch request.

     L2_LINES_OUT.ANY
	     (Event F2H, Umask 0FH) Counts all L2 cache lines evicted for any
	     reason.

     SQ_MISC.LRU_HINTS
	     (Event F4H, Umask 04H) Counts number of Super Queue LRU hints
	     sent to L3.

     SQ_MISC.SPLIT_LOCK
	     (Event F4H, Umask 10H) Counts the number of SQ lock splits across
	     a cache line.

     SQ_FULL_STALL_CYCLES
	     (Event F6H, Umask 01H) Counts cycles the Super Queue is full.
	     Neither of the threads on this core will be able to access the
	     uncore.

     FP_ASSIST.ALL
	     (Event F7H, Umask 01H) Counts the number of floating point opera‐
	     tions executed that required micro-code assist intervention.
	     Assists are required in the following cases: SSE instructions,
	     (Denormal input when the DAZ flag is off or Underflow result when
	     the FTZ flag is off): x87 instructions, (NaN or denormal are
	     loaded to a register or used as input from memory, Division by 0
	     or Underflow output).

     FP_ASSIST.OUTPUT
	     (Event F7H, Umask 02H) Counts number of floating point micro-code
	     assist when the output value (destination register) is invalid.

     FP_ASSIST.INPUT
	     (Event F7H, Umask 04H) Counts number of floating point micro-code
	     assist when the input value (one of the source operands to an FP
	     instruction) is invalid.

     SIMD_INT_64.PACKED_MPY
	     (Event FDH, Umask 01H) Counts number of SID integer 64 bit packed
	     multiply operations.

     SIMD_INT_64.PACKED_SHIFT
	     (Event FDH, Umask 02H) Counts number of SID integer 64 bit packed
	     shift operations.

     SIMD_INT_64.PACK
	     (Event FDH, Umask 04H) Counts number of SID integer 64 bit pack
	     operations.

     SIMD_INT_64.UNPACK
	     (Event FDH, Umask 08H) Counts number of SID integer 64 bit unpack
	     operations.

     SIMD_INT_64.PACKED_LOGICAL
	     (Event FDH, Umask 10H) Counts number of SID integer 64 bit logi‐
	     cal operations.

     SIMD_INT_64.PACKED_ARITH
	     (Event FDH, Umask 20H) Counts number of SID integer 64 bit arith‐
	     metic operations.

     SIMD_INT_64.SHUFFLE_MOVE
	     (Event FDH, Umask 40H) Counts number of SID integer 64 bit shift
	     or move operations.

SEE ALSO
     pmc(3), pmc.atom(3), pmc.core(3), pmc.iaf(3), pmc.ucf(3), pmc.k7(3),
     pmc.k8(3), pmc.p4(3), pmc.p5(3), pmc.p6(3), pmc.corei7(3),
     pmc.corei7uc(3), pmc.westmereuc(3), pmc.tsc(3), pmc_cpuinfo(3),
     pmclog(3), hwpmc(4)

HISTORY
     The pmc library first appeared in FreeBSD 6.0.

AUTHORS
     The Performance Counters Library (libpmc, -lpmc) library was written by
     Joseph Koshy ⟨jkoshy@FreeBSD.org⟩.

BSD				March 24, 2010				   BSD
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