[LTP] [PATCH 1/1] swapping01: make test more robust

[Li Wang]

Hi Alex, Petr,

I'm going to apply Alex's patch after a round of testing[1].
Because giving more time waiting for swap memory to
settle is no harm to test, at least help to get rid of failures
observed on LPAR so far.

But I still think the swapping01 not very precise to some degree.
We probably need to rewrite it someday but currently, I have no better idea.

[1] Running a stress-ng to eat some available memory in the
background, then swapping01 easily hit the heavy-swap issue.
This could be proved that it influenced by deamon allocate/free
memory during testing.

# stress-ng to eat memory after starting swapping01

# ./swapping01 -i 5
tst_test.c:1263: TINFO: Timeout per run is 0h 05m 00s
swapping01.c:107: TINFO: available physical memory: 4660 MB
swapping01.c:109: TINFO: try to allocate: 6058 MB
swapping01.c:112: TINFO: memory allocated: 6058 MB
swapping01.c:135: TINFO: DEBUG-INFO: swap_free_init = 6021120,
swap_free_now = 4738304, swap_consum(swap_free_init - swap_free_now) =
1282816
swapping01.c:135: TINFO: DEBUG-INFO: swap_free_init = 6021120,
swap_free_now = 4746496, swap_consum(swap_free_init - swap_free_now) =
1274624
swapping01.c:135: TINFO: DEBUG-INFO: swap_free_init = 6021120,
swap_free_now = 4616640, swap_consum(swap_free_init - swap_free_now) =
1404480
swapping01.c:135: TINFO: DEBUG-INFO: swap_free_init = 6021120,
swap_free_now = 4191936, swap_consum(swap_free_init - swap_free_now) =
1829184
swapping01.c:135: TINFO: DEBUG-INFO: swap_free_init = 6021120,
swap_free_now = 3339776, swap_consum(swap_free_init - swap_free_now) =
2681344
swapping01.c:135: TINFO: DEBUG-INFO: swap_free_init = 6021120,
swap_free_now = 3070336, swap_consum(swap_free_init - swap_free_now) =
2950784
swapping01.c:135: TINFO: DEBUG-INFO: swap_free_init = 6021120,
swap_free_now = 2763136, swap_consum(swap_free_init - swap_free_now) =
3257984
swapping01.c:135: TINFO: DEBUG-INFO: swap_free_init = 6021120,
swap_free_now = 2377280, swap_consum(swap_free_init - swap_free_now) =
3643840
swapping01.c:135: TINFO: DEBUG-INFO: swap_free_init = 6021120,
swap_free_now = 1876544, swap_consum(swap_free_init - swap_free_now) =
4144576
swapping01.c:135: TINFO: DEBUG-INFO: swap_free_init = 6021120,
swap_free_now = 1274432, swap_consum(swap_free_init - swap_free_now) =
4746688
swapping01.c:150: TFAIL: heavy swapping detected: 5075 MB swapped.

-- 
Regards,
Li Wang
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