[PATCH 9/9][v5] powerpc/perf: Update perf-mem man page for Power

[Sukadev Bhattiprolu]

Add a few lines to the perf-mem man page to indicate:

	- its dependence on the mem-loads and mem-stores events

	- how to use the feature on Power architecture.

Signed-off-by: Sukadev Bhattiprolu <sukadev at linux.vnet.ibm.com>
---
 tools/perf/Documentation/perf-mem.txt |   11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/perf/Documentation/perf-mem.txt b/tools/perf/Documentation/perf-mem.txt
index 888d511..f4881a0 100644
--- a/tools/perf/Documentation/perf-mem.txt
+++ b/tools/perf/Documentation/perf-mem.txt
@@ -18,6 +18,17 @@ 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.
 
+This command works on architectures that implement *mem-loads* and *mem-stores*
+perf events.
+
+The PowerPC architecture does not implement *mem-loads* and *mem-stores*
+events.  To get the memory hierarchy information for samples involving
+memory loads and stores, use a marked event like PM_MRK_GRP_CMPL.
+
+	perf record -d -e 'cpu/PM_MRK_GRP_CMPL/' <application>
+
+	perf report -n --mem-mode
+
 OPTIONS
 -------
 <command>...::
-- 
1.7.9.5