diff mbox series

[v6,3/8] swapon01: Improving test with memory limits and swap reporting

Message ID 20240131102514.2739270-4-liwang@redhat.com
State Accepted
Headers show
Series improvement work on libswap library | expand

Commit Message

Li Wang Jan. 31, 2024, 10:25 a.m. UTC 
This is target to create a more robust and controlled environment to test
the swapon system call. By introducing memory limits through cgroups and
filling memory with a known pattern, the test can better assess swapon
behavior when the system experiences memory pressure.

Additionally, the reporting of "SwapCached" memory before turning off the
swap file provides a clearer understanding of the swap system's state in
response to the test conditions.

Signed-off-by: Li Wang <liwang@redhat.com>
Tested-by: Petr Vorel <pvorel@suse.cz>
Reviewed-by: Petr Vorel <pvorel@suse.cz>
---
 testcases/kernel/syscalls/swapon/swapon01.c | 8 ++++++++
 1 file changed, 8 insertions(+)
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Patch

diff --git a/testcases/kernel/syscalls/swapon/swapon01.c b/testcases/kernel/syscalls/swapon/swapon01.c
index e1fe50459..a74a5171e 100644
--- a/testcases/kernel/syscalls/swapon/swapon01.c
+++ b/testcases/kernel/syscalls/swapon/swapon01.c
@@ -20,11 +20,15 @@ 
 
 #define MNTPOINT	"mntpoint"
 #define SWAP_FILE	MNTPOINT"/swapfile01"
+#define TESTMEM		(1UL<<30)
 
 static void verify_swapon(void)
 {
 	TST_EXP_PASS(tst_syscall(__NR_swapon, SWAP_FILE, 0));
 
+	tst_pollute_memory(TESTMEM, 0x41);
+	tst_res(TINFO, "SwapCached: %ld Kb", SAFE_READ_MEMINFO("SwapCached:"));
+
 	if (TST_PASS && tst_syscall(__NR_swapoff, SWAP_FILE) != 0) {
 		tst_brk(TBROK | TERRNO,
 				"Failed to turn off swapfile, system reboot recommended");
@@ -35,6 +39,9 @@  static void setup(void)
 {
 	is_swap_supported(SWAP_FILE);
 	make_swapfile(SWAP_FILE, 0);
+
+	SAFE_CG_PRINTF(tst_cg, "cgroup.procs", "%d", getpid());
+	SAFE_CG_PRINTF(tst_cg, "memory.max", "%lu", TESTMEM);
 }
 
 static struct tst_test test = {
@@ -42,6 +49,7 @@  static struct tst_test test = {
 	.mount_device = 1,
 	.needs_root = 1,
 	.all_filesystems = 1,
+	.needs_cgroup_ctrls = (const char *const []){ "memory", NULL },
 	.test_all = verify_swapon,
 	.setup = setup
 };