6 perf-mem - Profile memory accesses
11 'perf mem' [<options>] (record [<command>] | report)
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.
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.
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 queueing delays in addition to the memory subsystem latency.
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
34 Any command you can specify in a shell.
42 Don't do ownership validation
46 Select the memory operation type: load or store (default: load,store)
50 Dump the raw decoded samples on the screen in a format that is easy to parse with
54 --field-separator=<separator>::
55 Specify the field separator used when dump raw samples (-D option). By default,
56 The separator is the space character.
60 Monitor only on the list of CPUs provided. Multiple CPUs can be provided as a
61 comma-separated list with no space: 0,1. Ranges of CPUs are specified with -: 0-2. Default
62 is to monitor all CPUS.
65 Only display entries resolved to a symbol.
69 Record/Report sample physical addresses
72 Record/Report sample data address page size
78 Event selector. Use 'perf mem record -e list' to list available events.
82 Configure all used events to run in kernel space.
86 Configure all used events to run in user space.
90 Be more verbose (show counter open errors, etc)
93 Specify desired latency for loads event. Supported on Intel and Arm64
94 processors only. Ignored on other archs.
96 In addition, for report all perf report options are valid, and for record
97 all perf record options.
101 linkperf:perf-record[1], linkperf:perf-report[1], linkperf:perf-arm-spe[1]