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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> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: C1BDF18000B X-Stat-Signature: tzc3ogq11pobs9husncicgqasnpmyh6w X-Rspam-User: X-HE-Tag: 1758287219-875013 X-HE-Meta: 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 LUIIsgx2 IeUQcjY3L/kSqQpaUcNjEA7G4iOas9QSI67GvOkzONpzW5og2RWbWsQ1D1u5Xe1w5U1ggFLlxSnVgOCP7u8jpYFqV+YwcvLOhQMkIebfpfhm6H/IaXxA/JMjllifPf3xDJsX5eac0HmCcxNpJci3b7EdHGtSrq+hQkhvL5iemmbtTV4FFGBhUaxcT7O2shDFXcp0NGIAYcvpSvi95L4h63CquvXy/VC057w4ub0yBiL6nmmQqxFa68d2zZ1Ptvi+hoqO4qKFtLftAcR0I321g8TvsHD5pZHRKAXI8lhd4FAeBUETO65Kjekt8YaxXg+OS+5lM X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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/selftests/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); } +TEST_F(memory, thp) +{ + /* fill physical memory */ + memset(self->addr, 0x01, MB(2)); + + size_t huge = 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_enabled\n"); + + ASSERT_GE(huge, MB(2)); +} + TEST_HARNESS_MAIN -- 2.20.1