linux

History

Paul E. McKenney 5395467103 rcutorture: Do better bin packing Running the standard set of rcutorture tests on 24 CPUs results in the following sub-optimal schedule: ----start batch---- TREE07 16 ----start batch---- TREE08 16 SRCU-P 8 ----start batch---- TREE01 8 TREE02 8 TREE03 8 ----start batch---- TREE04 8 TREE05 8 TREE06 8 ----start batch---- SRCU-N 4 TINY01 1 TINY02 1 TREE09 1 If one of the eight-CPU runs were to be moved into the first batch, the test suite would complete in four batches rather than five. This commit therefore uses a greedy algorithm to re-order the test entries so that the sequential batching will produce an optimal schedule in this case: ----start batch---- TREE07 16 SRCU-P 8 ----start batch---- TREE08 16 TREE01 8 ----start batch---- TREE02 8 TREE03 8 TREE04 8 ----start batch---- TREE05 8 TREE06 8 SRCU-N 4 TINY01 1 TINY02 1 TREE09 1 Please note that this is still not an optimal bin-packing algorithm, however, it does produce optimal solutions for most common scenarios. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org>		2014-02-18 12:26:52 -08:00
..
breakpoints	breakpoint selftests: print failure status instead of cause make error	2012-12-17 17:15:27 -08:00
cpu-hotplug	tools/testing/selftests: don't assume the x bit is set on scripts	2013-07-03 16:08:07 -07:00
efivarfs	efivars: efivarfs_valid_name() should handle pstore syntax	2013-03-06 14:46:04 +00:00
ipc	selftests: IPC message queue copy feature test	2013-01-04 16:11:45 -08:00
kcmp	selftests: add .gitignore for kcmp	2013-07-03 16:08:07 -07:00
memory-hotplug	tools/testing/selftests: don't assume the x bit is set on scripts	2013-07-03 16:08:07 -07:00
mqueue	mqueue selftests: print failure status instead of cause make error	2012-12-17 17:15:26 -08:00
net	tools: selftests: psock_tpacket: get rid of macro wrappers	2013-07-02 00:23:57 -07:00
powerpc	selftests: Add test of PMU instruction counting on powerpc	2013-08-14 14:57:10 +10:00
ptrace	selftest: add a test case for PTRACE_PEEKSIGINFO	2013-04-30 17:04:05 -07:00
rcutorture	rcutorture: Do better bin packing	2014-02-18 12:26:52 -08:00
timers	tools/testing/selftests: fix uninitialized variable	2013-10-16 21:35:53 -07:00
user	test: check copy_to/from_user boundary validation	2014-01-23 16:36:57 -08:00
vm	selftests: add .gitignore for vm	2013-07-03 16:08:07 -07:00
Makefile	test: check copy_to/from_user boundary validation	2014-01-23 16:36:57 -08:00
README.txt	selftests: add a simple doc	2013-02-27 19:10:24 -08:00

README.txt

Linux Kernel Selftests

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
=====================

To build the tests:

  $ make -C tools/testing/selftests


To run the tests:

  $ make -C tools/testing/selftests run_tests

- note that some tests will require root privileges.


To run only tests targetted for a single subsystem:

  $  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.


Contributing new tests
======================

In general, the rules for for selftests are

 * Do as much as you can if you're not root;

 * Don't take too long;

 * Don't break the build on any architecture, and

 * Don't cause the top-level "make run_tests" to fail if your feature is
   unconfigured.