diff options
Diffstat (limited to '')
| -rw-r--r-- | tools/perf/Documentation/perf-mem.txt | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/tools/perf/Documentation/perf-mem.txt b/tools/perf/Documentation/perf-mem.txt index 199ea0f0a6c0..19862572e3f2 100644 --- a/tools/perf/Documentation/perf-mem.txt +++ b/tools/perf/Documentation/perf-mem.txt @@ -23,6 +23,11 @@ Note that on Intel systems the memory latency reported is the use-latency, not the pure load (or store latency). Use latency includes any pipeline queueing delays in addition to the memory subsystem latency. +On Arm64 this uses SPE to sample load and store operations, therefore hardware +and kernel support is required. See linkperf:perf-arm-spe[1] for a setup guide. +Due to the statistical nature of SPE sampling, not every memory operation will +be sampled. + OPTIONS ------- <command>...:: @@ -63,6 +68,9 @@ OPTIONS --phys-data:: Record/Report sample physical addresses +--data-page-size:: + Record/Report sample data address page size + RECORD OPTIONS -------------- -e:: @@ -82,11 +90,12 @@ RECORD OPTIONS Be more verbose (show counter open errors, etc) --ldlat <n>:: - Specify desired latency for loads event. (x86 only) + Specify desired latency for loads event. Supported on Intel and Arm64 + processors only. Ignored on other archs. In addition, for report all perf report options are valid, and for record all perf record options. SEE ALSO -------- -linkperf:perf-record[1], linkperf:perf-report[1] +linkperf:perf-record[1], linkperf:perf-report[1], linkperf:perf-arm-spe[1] |