• Sri Jayaramappa's avatar
    Test compaction of mlocked memory · bd67d5c1
    Sri Jayaramappa authored
    Commit commit 5bbe3547 ("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: default avatarSri 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: default avatarEric B Munson <emunson@akamai.com>
    Acked-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarShuah Khan <shuahkh@osg.samsung.com>
    bd67d5c1
compaction_test.c 5.02 KB