[LTP] [RFC] [PATCH] move_pages12: Allocate and free hugepages prior the test

[Jan Stancek <jstancek@redhat.com>]

----- Original Message -----
> This commit adds code into the test setup to mmap(), mbind() and fault
> hugepages on both testing nodes prior to the test run in order to make sure
> that there is enough continous space for the move_pages() syscall to move
> huge
> pages back and forth.

I'm still getting sporadic failures with 4.11 kernel. It's freshly
booted system, so I would expect fragmentation to be low:

# numactl -H; ./move_pages12 
available: 2 nodes (0-1)
node 0 cpus: 0 2 4 6 8 10 12 14 16 18 20 22
node 0 size: 31963 MB
node 0 free: 31600 MB
node 1 cpus: 1 3 5 7 9 11 13 15 17 19 21 23
node 1 size: 32251 MB
node 1 free: 31915 MB
node distances:
node   0   1 
  0:  10  20 
  1:  20  10

tst_test.c:847: INFO: Timeout per run is 0h 05m 00s
move_pages12.c:184: INFO: Free RAM 65040204 kB
move_pages12.c:139: INFO: Allocating and freeing 2 hugepages on node 0
move_pages12.c:139: INFO: Allocating and freeing 2 hugepages on node 1
nodes: 0 1
move_pages12.c:87: FAIL: move_pages failed: ENOMEM

Summary:
passed   0
failed   1
skipped  0
warnings 0

Regards,
Jan