litmus-rt.git/tools/testing/selftests/vm, branch master

mm, selftests: test return value of munmap for MAP_HUGETLB memory

2015-04-15T23:35:19+00:00

When MAP_HUGETLB memory is unmapped, the length must be hugepage aligned,
otherwise it fails with -EINVAL.

All tests currently behave correctly, but it's better to explcitly test
the return value for completeness and document the requirement, especially
if users copy map_hugetlb.c as a sample implementation.

Signed-off-by: David Rientjes 
Cc: Jonathan Corbet 
Cc: Davide Libenzi 
Cc: Luiz Capitulino 
Cc: Shuah Khan 
Cc: Hugh Dickins 
Cc: Andrea Arcangeli 
Cc: Joern Engel 
Cc: Jianguo Wu 
Cc: Eric B Munson 
Acked-by: Michael Ellerman 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

selftests: Set CC using CROSS_COMPILE once in lib.mk

2015-03-19T21:16:51+00:00

This avoids repeating the logic in every Makefile. We mimic the
top-level Makefile and use $(CROSS_COMPILE)gcc.

Signed-off-by: Michael Ellerman 
Signed-off-by: Shuah Khan

selftests: Add install target

2015-03-13T21:21:56+00:00

This adds make install support to selftests. The basic usage is:

$ cd tools/testing/selftests
$ make install

That installs into tools/testing/selftests/install, which can then be
copied where ever necessary.

The install destination is also configurable using eg:

$ INSTALL_PATH=/mnt/selftests make install

The implementation uses two targets in the child makefiles. The first
"install" is expected to install all files into $(INSTALL_PATH).

The second, "emit_tests", is expected to emit the test instructions (ie.
bash script) on stdout. Separating this from install means the child
makefiles need no knowledge of the location of the test script.

Signed-off-by: Michael Ellerman 
Signed-off-by: Shuah Khan

selftests: Introduce minimal shared logic for running tests

2015-03-13T21:13:40+00:00

This adds a Make include file which most selftests can then include to
get the run_tests logic.

On its own this has the advantage of some reduction in repetition, and
also means the pass/fail message is defined in fewer places.

However the key advantage is it will allow us to implement install very
simply in a subsequent patch.

The default implementation just executes each program in $(TEST_PROGS).

We use a variable to hold the default implementation of $(RUN_TESTS)
because that gives us a clean way to override it if necessary, ie. using
override. The mount, memory-hotplug and mqueue tests use that to provide
a different implementation.

Tests are not run via /bin/bash, so if they are scripts they must be
executable, we add a+x to several.

Signed-off-by: Michael Ellerman 
Signed-off-by: Shuah Khan

selftests/vm: fix link error for transhuge-stress test

2015-01-08T16:01:00+00:00

add -lrt to fix undefined reference to `clock_gettime'
error seen when the test is compiled using gcc 4.6.4.

Signed-off-by: Andrey Skvortsov 
Signed-off-by: Shuah Khan

selftests/vm/transhuge-stress: stress test for memory compaction

2014-10-10T02:26:01+00:00

This tool induces memory fragmentation via sequential allocation of
transparent huge pages and splitting off everything except their last
sub-pages.  It easily generates pressure to the memory compaction code.

$ perf stat -e 'compaction:*' -e 'migrate:*' ./transhuge-stress
transhuge-stress: allocate 7858 transhuge pages, using 15716 MiB virtual memory and 61 MiB of ram
transhuge-stress: 1.653 s/loop, 0.210 ms/page,   9504.828 MiB/s	7858 succeed,    0 failed, 2439 different pages
transhuge-stress: 1.537 s/loop, 0.196 ms/page,  10226.227 MiB/s	7858 succeed,    0 failed, 2364 different pages
transhuge-stress: 1.658 s/loop, 0.211 ms/page,   9479.215 MiB/s	7858 succeed,    0 failed, 2179 different pages
transhuge-stress: 1.617 s/loop, 0.206 ms/page,   9716.992 MiB/s	7858 succeed,    0 failed, 2421 different pages
^C./transhuge-stress: Interrupt

 Performance counter stats for './transhuge-stress':

         1.744.051      compaction:mm_compaction_isolate_migratepages
             1.014      compaction:mm_compaction_isolate_freepages
         1.744.051      compaction:mm_compaction_migratepages
             1.647      compaction:mm_compaction_begin
             1.647      compaction:mm_compaction_end
         1.744.051      migrate:mm_migrate_pages
                 0      migrate:mm_numa_migrate_ratelimit

       7,964696835 seconds time elapsed

Signed-off-by: Konstantin Khlebnikov 
Cc: Rafael Aquini 
Cc: Andrey Ryabinin 
Cc: Shuah Khan 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

selftests: add .gitignore for vm

2013-07-03T23:08:07+00:00

Signed-off-by: Ramkumar Ramachandra 
Cc: Dave Young 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

selftests: add hugetlbfstest

2013-07-03T23:08:07+00:00

As the confusing naming indicates, this test has some overlap with
pre-existing tests.  Would be nice to merge them eventually.  But since it
is only test code, cleanliness is much less important than mere existence.

Signed-off-by: Joern Engel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

self-test: fix make clean

2013-07-03T23:08:07+00:00

thuge-gen was forgotten.  Fix it by removing the duplication, so we don't
get too many repeats.

Signed-off-by: Joern Engel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

selftests: exit 1 on failure

2013-07-03T23:08:07+00:00

In case this ever gets scripted, it should return 0 on success and 1 on
failure.  Parsing the output should be left to meatbags.

Signed-off-by: Joern Engel 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds