[LTP] [PATCH] mm: as the same logic with queue_pages_range

[Cyril Hrubis]

Hi!
> Running tests.......
> <<<test_start>>>
> tag=vma02 stime=1694438526
> cmdline="vma02"
> contacts=""
> analysis=exit
> <<<test_output>>>
> vma02       0  TINFO  :  pid = 3639 addr = 0x7f5202dd6000
> vma02       0  TINFO  :  start = 0x7f5202dd6000, end = 0x7f5202dd7000
> vma02       0  TINFO  :  start = 0x7f5202dd7000, end = 0x7f5202dd8000
> vma02       0  TINFO  :  start = 0x7f5202dd8000, end = 0x7f5202dd9000
> vma02       1  TFAIL  :  vma02.c:144: >1 unmerged VMAs.
> incrementing stop

So the test is reproducer for:

commit 9d8cebd4bcd7c3878462fdfda34bbcdeb4df7ef4
Author: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Date:   Fri Mar 5 13:41:57 2010 -0800

    mm: fix mbind vma merge problem

    Strangely, current mbind() doesn't merge vma with neighbor vma although it's possible.
    Unfortunately, many vma can reduce performance...


And what the test does is:

- map 3 continous pages
- popluate
- mbind() first page
- mbind() all three pages
- checks that there is only single VMA for the pages after second
  mbind()

-- 
Cyril Hrubis
chrubis@suse.cz