Commit b6394097 authored Feb 28, 2014 by Andi Kleen Committed by Arnaldo Carvalho de Melo Mar 14, 2014

perf mem: Clarify load-latency in documentation



Clarify in the documentation that 'perf mem report' reports use-latency,
not load/store-latency on Intel systems.

This often causes confusion with users.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1393596135-4227-2-git-send-email-andi@firstfloor.org


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent 0fb298cf

tools/perf/Documentation/perf-mem.txt

+4 −0

Original line number	Diff line number	Diff line
		@@ -18,6 +18,10 @@ from it, into perf.data. Perf record options are accepted and are passed through
		"perf mem -t <TYPE> report" displays the result. It invokes perf report with the
		right set of options to display a memory access profile.

		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.

		OPTIONS
		-------
		<command>...::