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Sun, 19 Oct 2025 20:21:00 -0700 (PDT) Received: from localhost.localdomain ([2409:891f:1da1:a41d:3815:5989:6e28:9b6d]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7a22ff39437sm6770459b3a.27.2025.10.19.20.20.42 (version=TLS1_3 cipher=TLS_CHACHA20_POLY1305_SHA256 bits=256/256); Sun, 19 Oct 2025 20:20:59 -0700 (PDT) From: Yafang Shao To: akpm@linux-foundation.org, ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, martin.lau@linux.dev, eddyz87@gmail.com, song@kernel.org, yonghong.song@linux.dev, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@fomichev.me, haoluo@google.com, jolsa@kernel.org, david@redhat.com, ziy@nvidia.com, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, hannes@cmpxchg.org, usamaarif642@gmail.com, gutierrez.asier@huawei-partners.com, willy@infradead.org, ameryhung@gmail.com, rientjes@google.com, corbet@lwn.net, 21cnbao@gmail.com, shakeel.butt@linux.dev, tj@kernel.org, lance.yang@linux.dev, rdunlap@infradead.org Cc: bpf@vger.kernel.org, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Yafang Shao Subject: [PATCH v11 mm-new 10/10] selftests/bpf: add test case for BPF-THP inheritance across fork Date: Mon, 20 Oct 2025 11:20:32 +0800 Message-Id: <20251020032032.3393-1-laoar.shao@gmail.com> X-Mailer: git-send-email 2.37.1 (Apple Git-137.1) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Verify that child processes correctly inherit BPF-THP policy from their parent during fork() operations. Signed-off-by: Yafang Shao --- .../selftests/bpf/prog_tests/thp_adjust.c | 33 +++++++++++++++++++ 1 file changed, 33 insertions(+) diff --git a/tools/testing/selftests/bpf/prog_tests/thp_adjust.c b/tools/testing/selftests/bpf/prog_tests/thp_adjust.c index 0d570cee9006..f585e60882e8 100644 --- a/tools/testing/selftests/bpf/prog_tests/thp_adjust.c +++ b/tools/testing/selftests/bpf/prog_tests/thp_adjust.c @@ -267,6 +267,37 @@ static void subtest_thp_global_policy(void) bpf_link__destroy(global_link); } +static void subtest_thp_fork(void) +{ + int elighble, child, pid, status; + struct bpf_link *ops_link; + char *ptr; + + ops_link = bpf_map__attach_struct_ops(skel->maps.thp_eligible_ops); + if (!ASSERT_OK_PTR(ops_link, "attach struct_ops")) + return; + + child = fork(); + if (!ASSERT_GE(child, 0, "fork")) + goto destroy; + + if (child == 0) { + ptr = thp_alloc(); + elighble = get_thp_eligible(getpid(), (unsigned long)ptr); + ASSERT_EQ(elighble, 0, "THPeligible"); + thp_free(ptr); + + exit(EXIT_SUCCESS); + } + + pid = waitpid(child, &status, 0); + ASSERT_EQ(pid, child, "waitpid"); + +destroy: + bpf_link__destroy(ops_link); + +} + static int thp_adjust_setup(void) { int err = -1, pmd_order; @@ -319,6 +350,8 @@ void test_thp_adjust(void) subtest_thp_policy_update(); if (test__start_subtest("global_policy")) subtest_thp_global_policy(); + if (test__start_subtest("thp_fork")) + subtest_thp_fork(); thp_adjust_destroy(); } -- 2.47.3