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-rw-r--r--tools/perf/Documentation/perf-mem.txt7
1 files changed, 6 insertions, 1 deletions
diff --git a/tools/perf/Documentation/perf-mem.txt b/tools/perf/Documentation/perf-mem.txt
index 005c95580b1e..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>...::
@@ -93,4 +98,4 @@ 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]