linux-kernel - [PATCH 8/8] mshare: selftests: Add test case to demostrate that mshare doesn't support THP

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Message-Id: <20250825145719.29455-9-linyongting@bytedance.com>
Date: Mon, 25 Aug 2025 22:57:11 +0800
From: Yongting Lin <linyongting@...edance.com>
To: anthony.yznaga@...cle.com,
	khalid@...nel.org,
	shuah@...nel.org,
	linyongting@...edance.com
Cc: linux-kernel@...r.kernel.org,
	linux-kselftest@...r.kernel.org,
	akpm@...ux-foundation.org,
	linux-mm@...ck.org
Subject: [PATCH 8/8] mshare: selftests: Add test case to demostrate that mshare doesn't support THP

This case is quit simple by using madvise(MADV_HUGEPAGE), but for verifying
the size of THP memory, we need to setup the memcg and attach test
process to this memcg before perform the test.

Because mshare doesn't support THP feature, the size of THP memory should
be 0 even though we use madivse.

Signed-off-by: Yongting Lin <linyongting@...edance.com>
---
 tools/testing/selftests/mshare/memory.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/tools/testing/selftests/mshare/memory.c b/tools/testing/selftests/mshare/memory.c
index 7754c0e33506..2a415ce7bc01 100644
--- a/tools/testing/selftests/mshare/memory.c
+++ b/tools/testing/selftests/mshare/memory.c
@@ -68,4 +68,15 @@ TEST_F(memory, swap)
 	ASSERT_GT(swap_size, GB(1) * 9 / 10);
 }
 
+TEST_F(memory, thp)
+{
+	ASSERT_NE(madvise(self->addr, self->allocate_size, MADV_HUGEPAGE), -1);
+	/* touch 1G */
+	memset(self->addr, 0x01, GB(1));
+
+	size_t huge = read_huge_from_cgroup(self->cgroup);
+	/* mshare don't support THP now */
+	ASSERT_EQ(huge, 0);
+}
+
 TEST_HARNESS_MAIN
-- 
2.20.1