[LTP] [PATCH RFC 2/2] swapping01: check memory swap usage per process

[Li Wang]

Since previously swapping01 read the system FreeSwap for counting
usage of swap-size, that's not precise on system especially with
eating-memory daemon in the background. Now, we try to check the
'VmmSwap' in proc/PID/status per process, to get rid of the potential
influence from other processes which easily leads to false positive.

Signed-off-by: Li Wang <liwang@redhat.com>
Cc: Petr Vorel <pvorel@suse.cz>
Cc: Alexander Egorenkov <egorenar@linux.ibm.com>
---
 testcases/kernel/mem/swapping/swapping01.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/testcases/kernel/mem/swapping/swapping01.c b/testcases/kernel/mem/swapping/swapping01.c
index 8106f6466..0f693f313 100644
--- a/testcases/kernel/mem/swapping/swapping01.c
+++ b/testcases/kernel/mem/swapping/swapping01.c
@@ -137,8 +137,7 @@ static void check_swapping(void)
 		i++;
 	}
 
-	swap_free_now = SAFE_READ_MEMINFO("SwapFree:");
-	swapped = swap_free_init - swap_free_now;
+	swapped = SAFE_READ_PROC_STATUS(pid, "VmSwap:");
 	if (swapped > mem_over_max) {
 		kill(pid, SIGCONT);
 		tst_brk(TFAIL, "heavy swapping detected: "
-- 
2.21.3