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

[Alexander Egorenkov]

Increase time waiting for swap memory to settle before
performing checks with occupied swap memory. This decreases the chance
of the test to fail in the case of the swap memory taking longer
than expected to settle.

This fixes sporadic failures observed on IBM s390x systems such as this:

swapping01.c:149: TPASS: no heavy swapping detected, 4534 MB swapped.
swapping01.c:106: TINFO: available physical memory: 7348 MB
swapping01.c:109: TINFO: try to allocate: 9552 MB
swapping01.c:112: TINFO: memory allocated: 9552 MB
swapping01.c:140: TINFO: swap free init: 25019 MB
swapping01.c:141: TINFO: swap free now: 20484 MB
swapping01.c:149: TPASS: no heavy swapping detected, 4534 MB swapped.
swapping01.c:106: TINFO: available physical memory: 7348 MB
swapping01.c:109: TINFO: try to allocate: 9553 MB
swapping01.c:112: TINFO: memory allocated: 9553 MB
swapping01.c:140: TINFO: swap free init: 25018 MB
swapping01.c:141: TINFO: swap free now: 17694 MB
swapping01.c:149: TPASS: no heavy swapping detected, 7323 MB swapped.
swapping01.c:106: TINFO: available physical memory: 7318 MB
swapping01.c:109: TINFO: try to allocate: 9514 MB
swapping01.c:112: TINFO: memory allocated: 9514 MB
swapping01.c:140: TINFO: swap free init: 25019 MB
swapping01.c:141: TINFO: swap free now: 17697 MB
swapping01.c:145: TFAIL: heavy swapping detected: 7322 MB swapped.

Signed-off-by: Alexander Egorenkov <egorenar@linux.ibm.com>
---
 testcases/kernel/mem/swapping/swapping01.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/testcases/kernel/mem/swapping/swapping01.c b/testcases/kernel/mem/swapping/swapping01.c
index 24b8313f3..befb52e91 100644
--- a/testcases/kernel/mem/swapping/swapping01.c
+++ b/testcases/kernel/mem/swapping/swapping01.c
@@ -127,10 +127,10 @@ static void check_swapping(void)
 
 	/* Still occupying memory, loop for a while */
 	i = 0;
-	while (i < 10) {
+	while (i < 30) {
 		swap_free_now = SAFE_READ_MEMINFO("SwapFree:");
 		sleep(1);
-		if (labs(swap_free_now - SAFE_READ_MEMINFO("SwapFree:")) < 512)
+		if (labs(swap_free_now - SAFE_READ_MEMINFO("SwapFree:")) < 10)
 			break;
 
 		i++;
-- 
2.26.2