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-rw-r--r--tools/testing/selftests/README.txt27
1 files changed, 23 insertions, 4 deletions
diff --git a/tools/testing/selftests/README.txt b/tools/testing/selftests/README.txt
index 5e2faf9c55d3..2660d5ff9179 100644
--- a/tools/testing/selftests/README.txt
+++ b/tools/testing/selftests/README.txt
@@ -4,8 +4,15 @@ The kernel contains a set of "self tests" under the tools/testing/selftests/
directory. These are intended to be small unit tests to exercise individual
code paths in the kernel.
-Running the selftests
-=====================
+On some systems, hot-plug tests could hang forever waiting for cpu and
+memory to be ready to be offlined. A special hot-plug target is created
+to run full range of hot-plug tests. In default mode, hot-plug tests run
+in safe mode with a limited scope. In limited mode, cpu-hotplug test is
+run on a single cpu as opposed to all hotplug capable cpus, and memory
+hotplug test is run on 2% of hotplug capable memory instead of 10%.
+
+Running the selftests (hotplug tests are run in limited mode)
+=============================================================
To build the tests:
@@ -18,14 +25,26 @@ To run the tests:
- note that some tests will require root privileges.
-
-To run only tests targetted for a single subsystem:
+To run only tests targeted for a single subsystem: (including
+hotplug targets in limited mode)
$ make -C tools/testing/selftests TARGETS=cpu-hotplug run_tests
See the top-level tools/testing/selftests/Makefile for the list of all possible
targets.
+Running the full range hotplug selftests
+========================================
+
+To build the tests:
+
+ $ make -C tools/testing/selftests hotplug
+
+To run the tests:
+
+ $ make -C tools/testing/selftests run_hotplug
+
+- note that some tests will require root privileges.
Contributing new tests
======================