[LTP] [PATCH v9 1/2] cpuset02: Convert the test6 from cpuset_memory_testset.sh to C code

[Wei Gao via ltp <ltp@lists.linux.it>]

Improvements compare with test6 shell test:
* Remove /bin/echo $load_balance > $path/cpuset.sched_load_balance
since test focus on verify huge page is really allocated in the correct
node, task no need bind to specific cpuset.
* Directly keep 1 hpage reserved in each node otherwise test case has
chance to fail, since `echo 1 > /proc/sys/vm/nr_hugepages` will try to
reserve 1 pages from a NUMA node randomly.

Signed-off-by: Wei Gao <wegao@suse.com>
Reviewed-by: Petr Vorel <pvorel@suse.cz>
Suggested-by: Li Wang <liwang@redhat.com>
---
 runtest/mm                             |   1 +
 testcases/kernel/mem/.gitignore        |   1 +
 testcases/kernel/mem/cpuset/Makefile   |   5 +
 testcases/kernel/mem/cpuset/cpuset02.c | 140 +++++++++++++++++++++++++
 4 files changed, 147 insertions(+)
 create mode 100644 testcases/kernel/mem/cpuset/cpuset02.c

diff --git a/runtest/mm b/runtest/mm
index d8e62af81..5af29b0ea 100644
--- a/runtest/mm
+++ b/runtest/mm
@@ -75,6 +75,7 @@ ksm06_2 ksm06 -n 8000
 ksm07 ksm07
 
 cpuset01 cpuset01
+cpuset02 cpuset02
 
 oom01 oom01
 oom02 oom02
diff --git a/testcases/kernel/mem/.gitignore b/testcases/kernel/mem/.gitignore
index 699e022fb..e24e96001 100644
--- a/testcases/kernel/mem/.gitignore
+++ b/testcases/kernel/mem/.gitignore
@@ -1,4 +1,5 @@
 /cpuset/cpuset01
+/cpuset/cpuset02
 /hugetlb/hugefallocate/hugefallocate01
 /hugetlb/hugefallocate/hugefallocate02
 /hugetlb/hugefork/hugefork01
diff --git a/testcases/kernel/mem/cpuset/Makefile b/testcases/kernel/mem/cpuset/Makefile
index bac13e02b..7010c7be4 100644
--- a/testcases/kernel/mem/cpuset/Makefile
+++ b/testcases/kernel/mem/cpuset/Makefile
@@ -19,6 +19,11 @@
 
 top_srcdir		?= ../../../..
 
+LTPLIBS = numa
+
 include $(top_srcdir)/include/mk/testcases.mk
 include $(top_srcdir)/testcases/kernel/include/lib.mk
+
+cpuset02: LTPLDLIBS = -lltpnuma
+
 include $(top_srcdir)/include/mk/generic_leaf_target.mk
diff --git a/testcases/kernel/mem/cpuset/cpuset02.c b/testcases/kernel/mem/cpuset/cpuset02.c
new file mode 100644
index 000000000..1e239afa3
--- /dev/null
+++ b/testcases/kernel/mem/cpuset/cpuset02.c
@@ -0,0 +1,140 @@
+// SPDX-License-Identifier: LGPL-2.1-or-later
+/*
+ * Copyright (c) 2025 SUSE LLC <wegao@suse.com>
+ */
+
+/*\
+ * Test checks cpuset.mems works with hugepage file.
+ * Based on test6 from cpuset_memory_testset.sh written by Miao Xie.
+ */
+
+#define _GNU_SOURCE
+#include <stdio.h>
+#include <sys/mount.h>
+#include <limits.h>
+#include <sys/param.h>
+#include <sys/types.h>
+#include "tst_test.h"
+
+#ifdef HAVE_NUMA_V2
+#include <numaif.h>
+#include "tst_numa.h"
+
+#define MNTPOINT "hugetlbfs/"
+#define HUGE_PAGE_FILE MNTPOINT "hugepagefile"
+
+static long hpage_size;
+static struct tst_nodemap *node;
+static int check_node_id;
+static struct tst_cg_group *cg_cpuset_0;
+
+static void touch_memory_and_check_node(char *p, int size)
+{
+	int i;
+	int node = -1;
+	long ret;
+	int pagesize = sysconf(_SC_PAGESIZE);
+
+	for (i = 0; i < size; i += pagesize)
+		p[i] = 0xef;
+
+	ret = get_mempolicy(&node, NULL, 0, p, MPOL_F_NODE | MPOL_F_ADDR);
+	if (ret < 0)
+		tst_brk(TBROK | TERRNO, "get_mempolicy() failed");
+
+	if (node == check_node_id)
+		tst_res(TPASS, "1 huge page allocated on node-%d as expected", node);
+	else
+		tst_res(TFAIL, "1 huge page allocated on node-%d unexpected", node);
+}
+
+static void child(void)
+{
+	char *p;
+	int fd_hugepage;
+
+	fd_hugepage = SAFE_OPEN(HUGE_PAGE_FILE, O_CREAT | O_RDWR, 0755);
+TST_EXP_PASS_SILENT(system("cat /proc/meminfo"));
+	p = SAFE_MMAP(NULL, hpage_size, PROT_WRITE | PROT_READ,
+				MAP_SHARED, fd_hugepage, 0);
+
+	touch_memory_and_check_node(p, hpage_size);
+
+	SAFE_MUNMAP(p, hpage_size);
+	SAFE_CLOSE(fd_hugepage);
+}
+
+static void run_test(void)
+{
+	int pid;
+	char node_id_str[256];
+
+	cg_cpuset_0 = tst_cg_group_mk(tst_cg, "0");
+
+	sprintf(node_id_str, "%u", check_node_id);
+	SAFE_CG_PRINT(cg_cpuset_0, "cpuset.mems", node_id_str);
+
+	pid = SAFE_FORK();
+
+	if (!pid) {
+		SAFE_CG_PRINTF(cg_cpuset_0, "cgroup.procs", "%d", pid);
+		child();
+		return;
+	}
+
+	SAFE_WAITPID(pid, NULL, 0);
+
+	cg_cpuset_0 = tst_cg_group_rm(cg_cpuset_0);
+}
+
+static void setup(void)
+{
+	node = tst_get_nodemap(TST_NUMA_MEM, getpagesize() / 1024);
+	if (node->cnt <= 1)
+		tst_brk(TCONF, "test requires at least 2 NUMA memory nodes");
+
+	check_node_id = node->map[node->cnt - 1];
+
+	hpage_size = SAFE_READ_MEMINFO(MEMINFO_HPAGE_SIZE)*1024;
+
+	char path[256];
+	unsigned int i;
+	unsigned int nr_hugepages;
+
+	for (i = 0; i < node->cnt; i++) {
+		unsigned int current_node_id = node->map[i];
+
+		sprintf(path,
+			"/sys/devices/system/node/node%d/hugepages/hugepages-%ldkB/nr_hugepages",
+			current_node_id, hpage_size / 1024);
+		FILE_PRINTF(path, "%d", 1);
+		SAFE_FILE_SCANF(path, "%d", &nr_hugepages);
+		if (nr_hugepages != 1)
+			tst_brk(TCONF, "reserve 1 huge page on node%d failed", current_node_id);
+	}
+}
+
+static void cleanup(void)
+{
+	if (cg_cpuset_0)
+		cg_cpuset_0 = tst_cg_group_rm(cg_cpuset_0);
+}
+
+static struct tst_test test = {
+	.needs_root = 1,
+	.mntpoint = MNTPOINT,
+	.needs_hugetlbfs = 1,
+	.setup = setup,
+	.forks_child = 1,
+	.cleanup = cleanup,
+	.test_all = run_test,
+	.needs_cgroup_ctrls = (const char *const []){ "cpuset", NULL },
+	.save_restore = (const struct tst_path_val[]) {
+		{"/proc/sys/vm/nr_hugepages", NULL, TST_SR_TCONF},
+		{}
+	},
+};
+
+#else
+TST_TEST_TCONF(NUMA_ERROR_MSG);
+#endif
-- 
2.35.3


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