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John Levon's masters project makes use of performance-analysis [[MSR]]'s and a kernel module to provide awesome profiling capabilities on the [[Linux]] platform. Each processor has a set of events it | John Levon's masters project makes use of performance-analysis [[MSR]]'s and a kernel module to provide awesome profiling capabilities on the [[Linux]] platform. A more recent alternative is Ingo Molnar's [[perf]]. | ||
Each processor has a [[performance counters|set of events]] it collects (there might also be generic events '''FIXME'''), recoverable with <tt>opcontrol --list-events</tt>:<pre>[atlx-swps-ux-pol02](0) $ opcontrol --list-events | |||
oprofile: available events for CPU type "Core 2" | oprofile: available events for CPU type "Core 2" | ||
Revision as of 10:04, 19 September 2009
John Levon's masters project makes use of performance-analysis MSR's and a kernel module to provide awesome profiling capabilities on the Linux platform. A more recent alternative is Ingo Molnar's perf.
Each processor has a set of events it collects (there might also be generic events FIXME), recoverable with opcontrol --list-events:
[atlx-swps-ux-pol02](0) $ opcontrol --list-events oprofile: available events for CPU type "Core 2" See Intel Architecture Developer's Manual Volume 3, Appendix A and Intel Architecture Optimization Reference Manual (730795-001) CPU_CLK_UNHALTED: (counter: all) Clock cycles when not halted (min count: 6000) Unit masks (default 0x0) ---------- 0x00: Unhalted core cycles 0x01: Unhalted bus cycles 0x02: Unhalted bus cycles of this core while the other core is halted INST_RETIRED.ANY_P: (counter: all) number of instructions retired (min count: 6000) L2_RQSTS: (counter: all) number of L2 cache requests (min count: 500) Unit masks (default 0x7f) ---------- 0xc0: core: all cores 0x40: core: this core 0x30: prefetch: all inclusive 0x10: prefetch: Hardware prefetch only 0x00: prefetch: exclude hardware prefetch 0x08: (M)ESI: Modified 0x04: M(E)SI: Exclusive 0x02: ME(S)I: Shared 0x01: MES(I): Invalid LLC_MISSES: (counter: all) L2 cache demand requests from this core that missed the L2 (min count: 6000) Unit masks (default 0x41) ---------- 0x41: No unit mask LLC_REFS: (counter: all) L2 cache demand requests from this core (min count: 6000) Unit masks (default 0x4f) ---------- 0x4f: No unit mask LOAD_BLOCK: (counter: all) events pertaining to loads (min count: 500) Unit masks (default 0x3e) ---------- 0x02: STA Loads blocked by a preceding store with unknown address. 0x04: STD Loads blocked by a preceding store with unknown data. 0x08: OVERLAP_STORE Loads that partially overlap an earlier store, or 4K aliased with a previous store. 0x10: UNTIL_RETIRE Loads blocked until retirement. 0x20: L1D Loads blocked by the L1 data cache. STORE_BLOCK: (counter: all) events pertaining to stores (min count: 500) Unit masks (default 0xb) ---------- 0x01: SB_DRAIN_CYCLES Cycles while stores are blocked due to store buffer drain. 0x02: ORDER Cycles while store is waiting for a preceding store to be globally observed. 0x08: NOOP A store is blocked due to a conflict with an external or internal snoop. MISALIGN_MEM_REF: (counter: all) number of misaligned data memory references (min count: 500) SEGMENT_REG_LOADS: (counter: all) number of segment register loads (min count: 500) SSE_PRE_EXEC: (counter: all) number of SSE pre-fetch/weakly ordered insns retired (min count: 500) Unit masks (default 0x0) ---------- 0x00: prefetch NTA instructions executed. 0x01: prefetch T1 instructions executed. 0x02: prefetch T1 and T2 instructions executed. 0x03: SSE weakly-ordered stores DTLB_MISSES: (counter: all) DTLB miss events (min count: 500) Unit masks (default 0xf) ---------- 0x01: ANY Memory accesses that missed the DTLB. 0x02: MISS_LD DTLB misses due to load operations. 0x04: L0_MISS_LD L0 DTLB misses due to load operations. 0x08: MISS_ST TLB misses due to store operations. MEMORY_DISAMBIGUATION: (counter: all) Memory disambiguation reset cycles. (min count: 1000) Unit masks (default 0x1) ---------- 0x01: RESET Memory disambiguation reset cycles. 0x02: SUCCESS Number of loads that were successfully disambiguated. PAGE_WALKS: (counter: all) Page table walk events (min count: 500) Unit masks (default 0x2) ---------- 0x01: COUNT Number of page-walks executed. 0x02: CYCLES Duration of page-walks in core cycles. FLOPS: (counter: all) number of FP computational micro-ops executed (min count: 3000) FP_ASSIST: (counter: all) number of FP assists (min count: 500) MUL: (counter: all) number of multiplies (min count: 1000) DIV: (counter: all) number of divides (min count: 500) CYCLES_DIV_BUSY: (counter: all) cycles divider is busy (min count: 1000) IDLE_DURING_DIV: (counter: all) cycles divider is busy and all other execution units are idle. (min count: 1000) DELAYED_BYPASS: (counter: all) Delayed bypass events (min count: 1000) Unit masks (default 0x0) ---------- 0x00: FP Delayed bypass to FP operation. 0x01: SIMD Delayed bypass to SIMD operation. 0x02: LOAD Delayed bypass to load operation. L2_ADS: (counter: all) Cycles the L2 address bus is in use. (min count: 500) Unit masks (default 0x40) ---------- 0xc0: All cores 0x40: This core L2_DBUS_BUSY_RD: (counter: all) Cycles the L2 transfers data to the core. (min count: 500) Unit masks (default 0x40) ---------- 0xc0: All cores 0x40: This core L2_LINES_IN: (counter: all) number of allocated lines in L2 (min count: 500) Unit masks (default 0x70) ---------- 0xc0: core: all cores 0x40: core: this core 0x30: prefetch: all inclusive 0x10: prefetch: Hardware prefetch only 0x00: prefetch: exclude hardware prefetch L2_M_LINES_IN: (counter: all) number of modified lines allocated in L2 (min count: 500) Unit masks (default 0x40) ---------- 0xc0: All cores 0x40: This core L2_LINES_OUT: (counter: all) number of recovered lines from L2 (min count: 500) Unit masks (default 0x70) ---------- 0xc0: core: all cores 0x40: core: this core 0x30: prefetch: all inclusive 0x10: prefetch: Hardware prefetch only 0x00: prefetch: exclude hardware prefetch L2_M_LINES_OUT: (counter: all) number of modified lines removed from L2 (min count: 500) Unit masks (default 0x70) ---------- 0xc0: core: all cores 0x40: core: this core 0x30: prefetch: all inclusive 0x10: prefetch: Hardware prefetch only 0x00: prefetch: exclude hardware prefetch L2_IFETCH: (counter: all) number of L2 cacheable instruction fetches (min count: 500) Unit masks (default 0x4f) ---------- 0xc0: core: all cores 0x40: core: this core 0x08: (M)ESI: Modified 0x04: M(E)SI: Exclusive 0x02: ME(S)I: Shared 0x01: MES(I): Invalid L2_LD: (counter: all) number of L2 data loads (min count: 500) Unit masks (default 0x7f) ---------- 0xc0: core: all cores 0x40: core: this core 0x30: prefetch: all inclusive 0x10: prefetch: Hardware prefetch only 0x00: prefetch: exclude hardware prefetch 0x08: (M)ESI: Modified 0x04: M(E)SI: Exclusive 0x02: ME(S)I: Shared 0x01: MES(I): Invalid L2_ST: (counter: all) number of L2 data stores (min count: 500) Unit masks (default 0x4f) ---------- 0xc0: core: all cores 0x40: core: this core 0x08: (M)ESI: Modified 0x04: M(E)SI: Exclusive 0x02: ME(S)I: Shared 0x01: MES(I): Invalid L2_LOCK: (counter: all) number of locked L2 data accesses (min count: 500) Unit masks (default 0x4f) ---------- 0xc0: core: all cores 0x40: core: this core 0x08: (M)ESI: Modified 0x04: M(E)SI: Exclusive 0x02: ME(S)I: Shared 0x01: MES(I): Invalid L2_REJECT_BUSQ: (counter: all) Rejected L2 cache requests (min count: 500) Unit masks (default 0x7f) ---------- 0xc0: core: all cores 0x40: core: this core 0x30: prefetch: all inclusive 0x10: prefetch: Hardware prefetch only 0x00: prefetch: exclude hardware prefetch 0x08: (M)ESI: Modified 0x04: M(E)SI: Exclusive 0x02: ME(S)I: Shared 0x01: MES(I): Invalid L2_NO_REQ: (counter: all) Cycles no L2 cache requests are pending (min count: 500) Unit masks (default 0x40) ---------- 0xc0: All cores 0x40: This core EIST_TRANS_ALL: (counter: all) Intel(tm) Enhanced SpeedStep(r) Technology transitions (min count: 500) THERMAL_TRIP: (counter: all) Number of thermal trips (min count: 500) Unit masks (default 0xc0) ---------- 0xc0: No unit mask L1D_CACHE_LD: (counter: all) L1 cacheable data read operations (min count: 500) Unit masks (default 0xf) ---------- 0x08: (M)ESI: Modified 0x04: M(E)SI: Exclusive 0x02: ME(S)I: Shared 0x01: MES(I): Invalid L1D_CACHE_ST: (counter: all) L1 cacheable data write operations (min count: 500) Unit masks (default 0xf) ---------- 0x08: (M)ESI: Modified 0x04: M(E)SI: Exclusive 0x02: ME(S)I: Shared 0x01: MES(I): Invalid L1D_CACHE_LOCK: (counter: all) L1 cacheable lock read operations (min count: 500) Unit masks (default 0xf) ---------- 0x08: (M)ESI: Modified 0x04: M(E)SI: Exclusive 0x02: ME(S)I: Shared 0x01: MES(I): Invalid L1D_CACHE_LOCK_DURATION: (counter: all) Duration of L1 data cacheable locked operations (min count: 500) Unit masks (default 0x10) ---------- 0x10: No unit mask L1D_ALL_REF: (counter: all) All references to the L1 data cache (min count: 500) Unit masks (default 0x10) ---------- 0x10: No unit mask L1D_ALL_CACHE_REF: (counter: all) L1 data cacheable reads and writes (min count: 500) Unit masks (default 0x2) ---------- 0x02: No unit mask L1D_REPL: (counter: all) Cache lines allocated in the L1 data cache (min count: 500) Unit masks (default 0xf) ---------- 0x0f: No unit mask L1D_M_REPL: (counter: all) Modified cache lines allocated in the L1 data cache (min count: 500) L1D_M_EVICT: (counter: all) Modified cache lines evicted from the L1 data cache (min count: 500) L1D_PEND_MISS: (counter: all) Total number of outstanding L1 data cache misses at any cycle (min count: 500) L1D_SPLIT: (counter: all) Cache line split load/stores (min count: 500) Unit masks (default 0x1) ---------- 0x01: split loads 0x02: split stores SSE_PREF_MISS: (counter: all) SSE instructions that missed all caches (min count: 500) Unit masks (default 0x0) ---------- 0x00: PREFETCHNTA 0x01: PREFETCHT0 0x02: PREFETCHT1/PREFETCHT2 LOAD_HIT_PRE: (counter: all) Load operations conflicting with a software prefetch to the same address (min count: 500) L1D_PREFETCH: (counter: all) L1 data cache prefetch requests (min count: 500) Unit masks (default 0x10) ---------- 0x10: No unit mask BUS_REQ_OUTSTANDING: (counter: all) Outstanding cacheable data read bus requests duration (min count: 500) Unit masks (default 0x40) ---------- 0xc0: core: all cores 0x40: core: this core 0x00: bus: this agent 0x20: bus: include all agents BUS_BNR_DRV: (counter: all) Number of Bus Not Ready signals asserted (min count: 500) Unit masks (default 0x0) ---------- 0x00: this agent 0x20: include all agents BUS_DRDY_CLOCKS: (counter: all) Bus cycles when data is sent on the bus (min count: 500) Unit masks (default 0x0) ---------- 0x00: this agent 0x20: include all agents BUS_LOCK_CLOCKS: (counter: all) Bus cycles when a LOCK signal is asserted (min count: 500) Unit masks (default 0x40) ---------- 0xc0: core: all cores 0x40: core: this core 0x00: bus: this agent 0x20: bus: include all agents BUS_DATA_RCV: (counter: all) Bus cycles while processor receives data (min count: 500) Unit masks (default 0x40) ---------- 0xc0: core: all cores 0x40: core: this core 0x00: bus: this agent 0x20: bus: include all agents BUS_TRAN_BRD: (counter: all) Burst read bus transactions (min count: 500) Unit masks (default 0x40) ---------- 0xc0: core: all cores 0x40: core: this core 0x00: bus: this agent 0x20: bus: include all agents BUS_TRAN_RFO: (counter: all) number of completed read for ownership transactions (min count: 500) Unit masks (default 0x40) ---------- 0xc0: core: all cores 0x40: core: this core 0x00: bus: this agent 0x20: bus: include all agents BUS_TRAN_WB: (counter: all) number of explicit writeback bus transactions (min count: 500) Unit masks (default 0x40) ---------- 0xc0: core: all cores 0x40: core: this core 0x00: bus: this agent 0x20: bus: include all agents BUS_TRAN_IFETCH: (counter: all) number of instruction fetch transactions (min count: 500) Unit masks (default 0x40) ---------- 0xc0: core: all cores 0x40: core: this core 0x00: bus: this agent 0x20: bus: include all agents BUS_TRAN_INVAL: (counter: all) number of invalidate transactions (min count: 500) Unit masks (default 0x40) ---------- 0xc0: core: all cores 0x40: core: this core 0x00: bus: this agent 0x20: bus: include all agents BUS_TRAN_PWR: (counter: all) number of partial write bus transactions (min count: 500) Unit masks (default 0x40) ---------- 0xc0: core: all cores 0x40: core: this core 0x00: bus: this agent 0x20: bus: include all agents BUS_TRANS_P: (counter: all) number of partial bus transactions (min count: 500) Unit masks (default 0x40) ---------- 0xc0: core: all cores 0x40: core: this core 0x00: bus: this agent 0x20: bus: include all agents BUS_TRANS_IO: (counter: all) number of I/O bus transactions (min count: 500) Unit masks (default 0x40) ---------- 0xc0: core: all cores 0x40: core: this core 0x00: bus: this agent 0x20: bus: include all agents BUS_TRANS_DEF: (counter: all) number of completed defer transactions (min count: 500) Unit masks (default 0x40) ---------- 0xc0: core: all cores 0x40: core: this core 0x00: bus: this agent 0x20: bus: include all agents BUS_TRAN_BURST: (counter: all) number of completed burst transactions (min count: 500) Unit masks (default 0x40) ---------- 0xc0: core: all cores 0x40: core: this core 0x00: bus: this agent 0x20: bus: include all agents BUS_TRAN_MEM: (counter: all) number of completed memory transactions (min count: 500) Unit masks (default 0x40) ---------- 0xc0: core: all cores 0x40: core: this core 0x00: bus: this agent 0x20: bus: include all agents BUS_TRAN_ANY: (counter: all) number of any completed bus transactions (min count: 500) Unit masks (default 0x40) ---------- 0xc0: core: all cores 0x40: core: this core 0x00: bus: this agent 0x20: bus: include all agents EXT_SNOOP: (counter: all) External snoops (min count: 500) Unit masks (default 0xb) ---------- 0x00: bus: this agent 0x20: bus: include all agents 0x08: snoop: HITM snoops 0x02: snoop: HIT snoops 0x01: snoop: CLEAN snoops CMP_SNOOP: (counter: all) L1 data cache is snooped by other core (min count: 500) Unit masks (default 0x40) ---------- 0xc0: core: all cores 0x40: core: this core 0x01: snoop: CMP2I snoops 0x02: snoop: CMP2S snoops BUS_HIT_DRV: (counter: all) HIT signal asserted (min count: 500) Unit masks (default 0x0) ---------- 0x00: this agent 0x20: include all agents BUS_HITM_DRV: (counter: all) HITM signal asserted (min count: 500) Unit masks (default 0x0) ---------- 0x00: this agent 0x20: include all agents BUSQ_EMPTY: (counter: all) Bus queue is empty (min count: 500) Unit masks (default 0x40) ---------- 0xc0: All cores 0x40: This core SNOOP_STALL_DRV: (counter: all) Bus stalled for snoops (min count: 500) Unit masks (default 0x40) ---------- 0xc0: core: all cores 0x40: core: this core 0x00: bus: this agent 0x20: bus: include all agents BUS_IO_WAIT: (counter: all) IO requests waiting in the bus queue (min count: 500) Unit masks (default 0x40) ---------- 0xc0: All cores 0x40: This core L1I_READS: (counter: all) number of instruction fetches (min count: 500) L1I_MISSES: (counter: all) number of instruction fetch misses (min count: 500) ITLB: (counter: all) number of ITLB misses (min count: 500) Unit masks (default 0x12) ---------- 0x02: ITLB small page misses 0x10: ITLB large page misses 0x40: ITLB flushes INST_QUEUE.FULL: (counter: all) cycles during which the instruction queue is full (min count: 500) Unit masks (default 0x2) ---------- 0x02: No unit mask IFU_MEM_STALL: (counter: all) cycles instruction fetch pipe is stalled (min count: 500) ILD_STALL: (counter: all) cycles instruction length decoder is stalled (min count: 500) BR_INST_EXEC: (counter: all) Branch instructions executed (not necessarily retired) (min count: 3000) BR_MISSP_EXEC: (counter: all) Branch instructions executed that were mispredicted at execution (min count: 3000) BR_BAC_MISSP_EXEC: (counter: all) Branch instructions executed that were mispredicted at Front End (BAC) (min count: 3000) BR_CND_EXEC: (counter: all) Conditional Branch instructions executed (min count: 3000) BR_CND_MISSP_EXEC: (counter: all) Conditional Branch instructions executed that were mispredicted (min count: 3000) BR_IND_EXEC: (counter: all) Indirect Branch instructions executed (min count: 3000) BR_IND_MISSP_EXEC: (counter: all) Indirect Branch instructions executed that were mispredicted (min count: 3000) BR_RET_EXEC: (counter: all) Return Branch instructions executed (min count: 3000) BR_RET_MISSP_EXEC: (counter: all) Return Branch instructions executed that were mispredicted at Execution (min count: 3000) BR_RET_BAC_MISSP_EXEC: (counter: all) Branch instructions executed that were mispredicted at Front End (BAC) (min count: 3000) BR_CALL_EXEC: (counter: all) CALL instruction executed (min count: 3000) BR_CALL_MISSP_EXEC: (counter: all) CALL instruction executed and miss predicted (min count: 3000) BR_IND_CALL_EXEC: (counter: all) Indirect CALL instruction executed (min count: 3000) BR_TKN_BUBBLE_1: (counter: all) Branch predicted taken with bubble 1 (min count: 3000) BR_TKN_BUBBLE_2: (counter: all) Branch predicted taken with bubble 2 (min count: 3000) RS_UOPS_DISPATCHED: (counter: all) Micro-ops dispatched for execution (min count: 1000) RS_UOPS_DISPATCHED_NONE: (counter: all) No Micro-ops dispatched for execution (min count: 1000) MACRO_INSTS: (counter: all) instructions decoded (min count: 500) Unit masks (default 0x9) ---------- 0x01: Instructions decoded 0x08: CISC Instructions decoded ESP: (counter: all) ESP register events (min count: 500) Unit masks (default 0x1) ---------- 0x01: ESP register content synchronizations 0x02: ESP register automatic additions SIMD_UOPS_EXEC: (counter: all) SIMD micro-ops executed (excluding stores) (min count: 500) SIMD_SAT_UOP_EXEC: (counter: all) number of SIMD saturating instructions executed (min count: 3000) SIMD_UOP_TYPE_EXEC: (counter: all) number of SIMD packing instructions (min count: 3000) Unit masks (default 0x3f) ---------- 0x01: SIMD packed multiplies 0x02: SIMD packed shifts 0x04: SIMD pack operations 0x08: SIMD unpack operations 0x10: SIMD packed logical 0x20: SIMD packed arithmetic 0x3f: all of the above INST_RETIRED: (counter: all) number of instructions retired (min count: 6000) Unit masks (default 0x0) ---------- 0x00: Any 0x01: Loads 0x02: Stores 0x04: Other X87_OPS_RETIRED: (counter: all) number of computational FP operations retired (min count: 500) Unit masks (default 0xfe) ---------- 0x01: FXCH instructions retired 0xfe: Retired floating-point computational operations (precise) UOPS_RETIRED: (counter: all) number of UOPs retired (min count: 6000) Unit masks (default 0xf) ---------- 0x01: Fused load+op or load+indirect branch retired 0x02: Fused store address + data retired 0x04: Retired instruction pairs fused into one micro-op 0x07: Fused micro-ops retired 0x08: Non-fused micro-ops retired 0x0f: Micro-ops retired MACHINE_NUKES.SMC: (counter: all) number of pipeline flushing events (min count: 500) Unit masks (default 0x5) ---------- 0x01: Self-Modifying Code detected 0x04: Execution pipeline restart due to memory ordering conflict or memory disambiguation misprediction BR_INST_RETIRED: (counter: all) number of branch instructions retired (min count: 500) Unit masks (default 0xa) ---------- 0x01: predicted not-taken 0x02: mispredicted not-taken 0x04: predicted taken 0x08: mispredicted taken BR_MISS_PRED_RETIRED: (counter: all) number of mispredicted branches retired (precise) (min count: 500) CYCLES_INT_MASKED: (counter: all) cycles interrupts are disabled (min count: 500) Unit masks (default 0x2) ---------- 0x01: Interrupts disabled 0x02: Interrupts pending and disabled SIMD_INST_RETIRED: (counter: all) SSE/SSE2 instructions retired (min count: 500) Unit masks (default 0x1f) ---------- 0x01: Retired SSE packed-single instructions 0x02: Retired SSE scalar-single instructions 0x04: Retired SSE2 packed-double instructions 0x08: Retired SSE2 scalar-double instructions 0x10: Retired SSE2 vector integer instructions 0x1f: Retired Streaming SIMD instructions (precise event) HW_INT_RCV: (counter: all) number of hardware interrupts received (min count: 500) ITLB_MISS_RETIRED: (counter: 0) Retired instructions that missed the ITLB (min count: 500) SIMD_COMP_INST_RETIRED: (counter: all) Retired computational SSE/SSE2 instructions (min count: 500) Unit masks (default 0xf) ---------- 0x01: Retired computational SSE packed-single instructions 0x02: Retired computational SSE scalar-single instructions 0x04: Retired computational SSE2 packed-double instructions 0x08: Retired computational SSE2 scalar-double instructions MEM_LOAD_RETIRED: (counter: 0) Retired loads (min count: 500) Unit masks (default 0x1) ---------- 0x01: Retired loads that miss the L1 data cache (precise event) 0x02: L1 data cache line missed by retired loads (precise event) 0x04: Retired loads that miss the L2 cache (precise event) 0x08: L2 cache line missed by retired loads (precise event) 0x10: Retired loads that miss the DTLB (precise event) FP_MMX_TRANS: (counter: all) MMX-floating point transitions (min count: 3000) Unit masks (default 0x3) ---------- 0x01: float->MMX transitions 0x02: MMX->float transitions MMX_ASSIST: (counter: all) number of EMMS instructions executed (min count: 500) SIMD_INSTR_RET: (counter: all) number of SIMD instructions retired (min count: 500) SIMD_SAT_INSTR_RET: (counter: all) number of saturated arithmetic instructions retired (min count: 500) RAT_STALLS: (counter: all) Partial register stall cycles (min count: 6000) Unit masks (default 0xf) ---------- 0x01: ROB read port 0x02: Partial register 0x04: Flag 0x08: FPU status word 0x0f: All RAT SEG_RENAME_STALLS: (counter: all) Segment rename stalls (min count: 500) Unit masks (default 0xf) ---------- 0x01: ES 0x02: DS 0x04: FS 0x08: GS SEG_RENAMES: (counter: all) Segment renames (min count: 500) Unit masks (default 0xf) ---------- 0x01: ES 0x02: DS 0x04: FS 0x08: GS RESOURCE_STALLS: (counter: all) Cycles during which resource stalls occur (min count: 3000) Unit masks (default 0xf) ---------- 0x01: when the ROB is full 0x02: during which the RS is full 0x04: during which the pipeline has exceeded the load or store limit or is waiting to commit all stores 0x08: due to FPU control word write 0x10: due to branch misprediction BR_INST_DECODED: (counter: all) number of branch instructions decoded (min count: 500) BR_BOGUS: (counter: all) number of bogus branches (min count: 500) BACLEARS: (counter: all) number of times BACLEAR is asserted (min count: 500) PREF_RQSTS_UP: (counter: all) Number of upward prefetches issued (min count: 3000) PREF_RQSTS_DN: (counter: all) Number of downward prefetches issued (min count: 3000) [atlx-swps-ux-pol02](0) $
See also
- Main Oprofile page
