1 perf-mem(1) 2 =========== 3 4 NAME 5 ---- 6 perf-mem - Profile memory accesses 7 8 SYNOPSIS 9 -------- 10 [verse] 11 'perf mem' [<options>] (record [<command>] | report) 12 13 DESCRIPTION 14 ----------- 15 "perf mem record" runs a command and gathers memory operation data 16 from it, into perf.data. Perf record options are accepted and are passed through. 17 18 "perf mem report" displays the result. It invokes perf report with the 19 right set of options to display a memory access profile. By default, loads 20 and stores are sampled. Use the -t option to limit to loads or stores. 21 22 Note that on Intel systems the memory latency reported is the use-latency, 23 not the pure load (or store latency). Use latency includes any pipeline 24 queuing delays in addition to the memory subsystem latency. 25 26 On Arm64 this uses SPE to sample load and store operations, therefore hardware 27 and kernel support is required. See linkperf:perf-arm-spe[1] for a setup guide. 28 Due to the statistical nature of SPE sampling, not every memory operation will 29 be sampled. 30 31 COMMON OPTIONS 32 -------------- 33 -f:: 34 --force:: 35 Don't do ownership validation 36 37 -t:: 38 --type=<type>:: 39 Select the memory operation type: load or store (default: load,store) 40 41 -v:: 42 --verbose:: 43 Be more verbose (show counter open errors, etc) 44 45 -p:: 46 --phys-data:: 47 Record/Report sample physical addresses 48 49 --data-page-size:: 50 Record/Report sample data address page size 51 52 RECORD OPTIONS 53 -------------- 54 <command>...:: 55 Any command you can specify in a shell. 56 57 -e:: 58 --event <event>:: 59 Event selector. Use 'perf mem record -e list' to list available events. 60 61 -K:: 62 --all-kernel:: 63 Configure all used events to run in kernel space. 64 65 -U:: 66 --all-user:: 67 Configure all used events to run in user space. 68 69 --ldlat <n>:: 70 Specify desired latency for loads event. Supported on Intel and Arm64 71 processors only. Ignored on other archs. 72 73 REPORT OPTIONS 74 -------------- 75 -i:: 76 --input=<file>:: 77 Input file name. 78 79 -C:: 80 --cpu=<cpu>:: 81 Monitor only on the list of CPUs provided. Multiple CPUs can be provided as a 82 comma-separated list with no space: 0,1. Ranges of CPUs are specified with - 83 like 0-2. Default is to monitor all CPUS. 84 85 -D:: 86 --dump-raw-samples:: 87 Dump the raw decoded samples on the screen in a format that is easy to parse with 88 one sample per line. 89 90 -s:: 91 --sort=<key>:: 92 Group result by given key(s) - multiple keys can be specified 93 in CSV format. The keys are specific to memory samples are: 94 symbol_daddr, symbol_iaddr, dso_daddr, locked, tlb, mem, snoop, 95 dcacheline, phys_daddr, data_page_size, blocked. 96 97 - symbol_daddr: name of data symbol being executed on at the time of sample 98 - symbol_iaddr: name of code symbol being executed on at the time of sample 99 - dso_daddr: name of library or module containing the data being executed 100 on at the time of the sample 101 - locked: whether the bus was locked at the time of the sample 102 - tlb: type of tlb access for the data at the time of the sample 103 - mem: type of memory access for the data at the time of the sample 104 - snoop: type of snoop (if any) for the data at the time of the sample 105 - dcacheline: the cacheline the data address is on at the time of the sample 106 - phys_daddr: physical address of data being executed on at the time of sample 107 - data_page_size: the data page size of data being executed on at the time of sample 108 - blocked: reason of blocked load access for the data at the time of the sample 109 110 And the default sort keys are changed to local_weight, mem, sym, dso, 111 symbol_daddr, dso_daddr, snoop, tlb, locked, blocked, local_ins_lat. 112 113 -T:: 114 --type-profile:: 115 Show data-type profile result instead of code symbols. This requires 116 the debug information and it will change the default sort keys to: 117 mem, snoop, tlb, type. 118 119 -U:: 120 --hide-unresolved:: 121 Only display entries resolved to a symbol. 122 123 -x:: 124 --field-separator=<separator>:: 125 Specify the field separator used when dump raw samples (-D option). By default, 126 The separator is the space character. 127 128 In addition, for report all perf report options are valid, and for record 129 all perf record options. 130 131 SEE ALSO 132 -------- 133 linkperf:perf-record[1], linkperf:perf-report[1], linkperf:perf-arm-spe[1]
Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.