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Fri, 19 Sep 2025 06:06:58 -0700 (PDT) Received: from H3DJ4YJ04F.bytedance.net ([2001:c10:ff04:0:1000::d]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-269802e00b3sm54732065ad.90.2025.09.19.06.06.54 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Fri, 19 Sep 2025 06:06:58 -0700 (PDT) From: Yongting Lin To: anthony.yznaga@oracle.com, khalid@kernel.org, shuah@kernel.org Cc: linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, akpm@linux-foundation.org, linux-mm@kvack.org, libo.gcs85@bytedance.com, Yongting Lin Subject: [PATCH V2 8/8] mshare: selftests: Add test case to demostrate that mshare partly supports THP Date: Fri, 19 Sep 2025 21:06:20 +0800 Message-Id: <20250919130620.56518-8-linyongting@bytedance.com> X-Mailer: git-send-email 2.39.5 (Apple Git-154) In-Reply-To: <20250919130620.56518-1-linyongting@bytedance.com> References: <20250919130620.56518-1-linyongting@bytedance.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Currently, mshare doesn't support madvise(MADV_HUGEPAGE) to make pages become THP page. Thus we need to set /sys/kernel/mm/transparent_hugepage/shmem_enabled to 'always', enabling mshare to acquire THP pages in a best effort way. This case is quit simple that set up a mshare memory with 2MB size, than use memset to fill the physical memory and verify whether THP was allocated by reading memory.stat. Signed-off-by: Yongting Lin --- tools/testing/selftests/mshare/memory.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/tools/testing/selftests/mshare/memory.c b/tools/testing/selfte= sts/mshare/memory.c index 4bb0d22b9c03..5132210b1465 100644 --- a/tools/testing/selftests/mshare/memory.c +++ b/tools/testing/selftests/mshare/memory.c @@ -68,4 +68,22 @@ TEST_F(memory, swap) ASSERT_GT(swap_size, MB(2) * 9 / 10); } =20 +TEST_F(memory, thp) +{ + /* fill physical memory */ + memset(self->addr, 0x01, MB(2)); + + size_t huge =3D read_huge_from_cgroup(self->cgroup); + + /* + * mshare only allocate in the best effort way, and + * don't support madvise(MADV_HUGEPAGE) to change pages + * into THP or khuged to replace pages with THP. + */ + ksft_print_msg("Tip: Please enable transparent hugepages for shmem before= running this test.\n" + "For example: echo always > /sys/kernel/mm/transparent_hugepage/shmem_e= nabled\n"); + + ASSERT_GE(huge, MB(2)); +} + TEST_HARNESS_MAIN --=20 2.20.1