2 Commits

Author	SHA1	Message	Date
Yannick Brosseau	ee65735dd5	selftests/vm: write strlen length instead of sizeof to nr_hugepages ... When setting back the initial value to nr_hugepages, the test was writing a length sizeof of the string and checking that strlen was writen. Since those values are not the same, use strlen in both place instead. Also make the error messages more explicit to help in future debugging. Signed-off-by: Yannick Brosseau <scientist@fb.com> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>	2016-06-27 13:18:26 -06:00
Sri Jayaramappa	bd67d5c15c	Test compaction of mlocked memory ... Commit commit 5bbe3547aa ("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 <sjayaram@akamai.com> Cc: linux-kernel@vger.kernel.org Cc: linux-api@vger.kernel.org Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Eric B Munson <emunson@akamai.com> Reviewed-by: Eric B Munson <emunson@akamai.com> Acked-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>	2015-05-26 15:58:06 -06:00