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Shutemov" To: Dave Hansen , Andy Lutomirski , Peter Zijlstra Cc: x86@kernel.org, Kostya Serebryany , Andrey Ryabinin , Andrey Konovalov , Alexander Potapenko , Taras Madan , Dmitry Vyukov , "H . J . Lu" , Andi Kleen , Rick Edgecombe , Bharata B Rao , Jacob Pan , Ashok Raj , Linus Torvalds , linux-mm@kvack.org, linux-kernel@vger.kernel.org, "Kirill A. Shutemov" Subject: [PATCHv13 16/16] selftests/x86/lam: Add test cases for LAM vs thread creation Date: Tue, 27 Dec 2022 06:08:29 +0300 Message-Id: <20221227030829.12508-17-kirill.shutemov@linux.intel.com> X-Mailer: git-send-email 2.38.2 In-Reply-To: <20221227030829.12508-1-kirill.shutemov@linux.intel.com> References: <20221227030829.12508-1-kirill.shutemov@linux.intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: 732F520005 X-Rspamd-Server: rspam09 X-Rspam-User: X-Stat-Signature: ec4iejk35t1pyp5fpskxdaozdrz1bsd9 X-HE-Tag: 1672110537-896614 X-HE-Meta: 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 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: LAM enabling is only allowed when the process has single thread. LAM mode is inherited into child thread. Trying to enable LAM after spawning a thread has to fail. Signed-off-by: Kirill A. Shutemov --- tools/testing/selftests/x86/lam.c | 92 +++++++++++++++++++++++++++++++ 1 file changed, 92 insertions(+) diff --git a/tools/testing/selftests/x86/lam.c b/tools/testing/selftests/x86/lam.c index 52a876a7ccb8..93e6089164b6 100644 --- a/tools/testing/selftests/x86/lam.c +++ b/tools/testing/selftests/x86/lam.c @@ -1,4 +1,5 @@ // SPDX-License-Identifier: GPL-2.0 +#define _GNU_SOURCE #include #include #include @@ -12,6 +13,7 @@ #include #include #include +#include #include #include @@ -50,6 +52,8 @@ #define PAGE_SIZE (4 << 10) +#define STACK_SIZE 65536 + #define barrier() ({ \ __asm__ __volatile__("" : : : "memory"); \ }) @@ -731,6 +735,75 @@ static int handle_inheritance(struct testcases *test) return 0; } +static int thread_fn_get_lam(void *arg) +{ + return get_lam(); +} + +static int thread_fn_set_lam(void *arg) +{ + struct testcases *test = arg; + + return set_lam(test->lam); +} + +static int handle_thread(struct testcases *test) +{ + char stack[STACK_SIZE]; + int ret, child_ret; + int lam = 0; + pid_t pid; + + /* Set LAM mode in parent process */ + if (!test->later) { + lam = test->lam; + if (set_lam(lam) != 0) + return 1; + } + + pid = clone(thread_fn_get_lam, stack + STACK_SIZE, + SIGCHLD | CLONE_FILES | CLONE_FS | CLONE_VM, NULL); + if (pid < 0) { + perror("Clone failed."); + return 1; + } + + waitpid(pid, &child_ret, 0); + ret = WEXITSTATUS(child_ret); + + if (lam != ret) + return 1; + + if (test->later) { + if (set_lam(test->lam) != 0) + return 1; + } + + return 0; +} + +static int handle_thread_enable(struct testcases *test) +{ + char stack[STACK_SIZE]; + int ret, child_ret; + int lam = test->lam; + pid_t pid; + + pid = clone(thread_fn_set_lam, stack + STACK_SIZE, + SIGCHLD | CLONE_FILES | CLONE_FS | CLONE_VM, test); + if (pid < 0) { + perror("Clone failed."); + return 1; + } + + waitpid(pid, &child_ret, 0); + ret = WEXITSTATUS(child_ret); + + if (lam != ret) + return 1; + + return 0; +} static void run_test(struct testcases *test, int count) { int i, ret = 0; @@ -846,6 +919,25 @@ static struct testcases inheritance_cases[] = { .test_func = handle_inheritance, .msg = "FORK: LAM_U57, child process should get LAM mode same as parent\n", }, + { + .expected = 0, + .lam = LAM_U57_BITS, + .test_func = handle_thread, + .msg = "THREAD: LAM_U57, child thread should get LAM mode same as parent\n", + }, + { + .expected = 1, + .lam = LAM_U57_BITS, + .test_func = handle_thread_enable, + .msg = "THREAD: [NEGATIVE] Enable LAM in child.\n", + }, + { + .expected = 1, + .later = 1, + .lam = LAM_U57_BITS, + .test_func = handle_thread, + .msg = "THREAD: [NEGATIVE] Enable LAM in parent after thread created.\n", + }, { .expected = 0, .lam = LAM_U57_BITS, -- 2.38.2