linux/tools/testing/selftests/vm, branch v4.2

Test compaction of mlocked memory

2015-05-26T21:58:06Z

Commit commit 5bbe3547aa3b ("mm: allow compaction of unevictable pages") introduced a sysctl that allows userspace to enable scanning of locked pages for compaction. This patch introduces a new test which fragments main memory and attempts to allocate a number of huge pages to exercise this compaction logic. Tested on machines with up to 32 GB RAM. With the patch a much larger number of huge pages can be allocated than on the kernel without the patch. Example output: On a machine with 16 GB RAM: sudo make run_tests vm ... ----------------------- running compaction_test ----------------------- No of huge pages allocated = 3834 [PASS] ... Signed-off-by: Sri Jayaramappa Cc: linux-kernel@vger.kernel.org Cc: linux-api@vger.kernel.org Cc: Andrew Morton Cc: Eric B Munson Reviewed-by: Eric B Munson Acked-by: Andrew Morton Signed-off-by: Shuah Khan

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

2015-04-15T23:35:19Z

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

2015-03-19T21:16:51Z

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

2015-03-13T21:21:56Z

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

2015-03-13T21:13:40Z

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

2015-01-08T16:01:00Z

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

2014-10-10T02:26:01Z

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

2013-07-03T23:08:07Z

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

selftests: add hugetlbfstest

2013-07-03T23:08:07Z

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

2013-07-03T23:08:07Z

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