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McKenney" , Boqun Feng , "H . Peter Anvin" , Paul Turner , linux-api@vger.kernel.org, Christian Brauner , Florian Weimer , David.Laight@ACULAB.COM, carlos@redhat.com, Peter Oskolkov , Alexander Mikhalitsyn , Chris Kennelly , Ingo Molnar , Darren Hart , Davidlohr Bueso , =?utf-8?q?Andr=C3=A9_Almeida?= , libc-alpha@sourceware.org, Steven Rostedt , Jonathan Corbet , Mathieu Desnoyers Subject: [RFC PATCH 3/4] selftests/rseq: Implement sched state test program Date: Wed, 17 May 2023 11:26:53 -0400 Message-Id: <20230517152654.7193-4-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230517152654.7193-1-mathieu.desnoyers@efficios.com> References: <20230517152654.7193-1-mathieu.desnoyers@efficios.com> MIME-Version: 1.0 X-Spam-Status: No, score=-1.3 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RDNS_NONE,SPF_HELO_NONE, SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1766155878190836200?= X-GMAIL-MSGID: =?utf-8?q?1766155878190836200?= This is a small test program with can be altered to show whether the target thread is on-cpu or not, dependending on whether it loops on poll() or does a busy-loop. Signed-off-by: Mathieu Desnoyers --- tools/testing/selftests/rseq/.gitignore | 1 + tools/testing/selftests/rseq/Makefile | 2 +- .../testing/selftests/rseq/sched_state_test.c | 71 +++++++++++++++++++ 3 files changed, 73 insertions(+), 1 deletion(-) create mode 100644 tools/testing/selftests/rseq/sched_state_test.c diff --git a/tools/testing/selftests/rseq/.gitignore b/tools/testing/selftests/rseq/.gitignore index 16496de5f6ce..a8db9f7a7cec 100644 --- a/tools/testing/selftests/rseq/.gitignore +++ b/tools/testing/selftests/rseq/.gitignore @@ -9,3 +9,4 @@ param_test_compare_twice param_test_mm_cid param_test_mm_cid_benchmark param_test_mm_cid_compare_twice +sched_state_test diff --git a/tools/testing/selftests/rseq/Makefile b/tools/testing/selftests/rseq/Makefile index b357ba24af06..7c8f4f2be74c 100644 --- a/tools/testing/selftests/rseq/Makefile +++ b/tools/testing/selftests/rseq/Makefile @@ -14,7 +14,7 @@ OVERRIDE_TARGETS = 1 TEST_GEN_PROGS = basic_test basic_percpu_ops_test basic_percpu_ops_mm_cid_test param_test \ param_test_benchmark param_test_compare_twice param_test_mm_cid \ - param_test_mm_cid_benchmark param_test_mm_cid_compare_twice + param_test_mm_cid_benchmark param_test_mm_cid_compare_twice sched_state_test TEST_GEN_PROGS_EXTENDED = librseq.so diff --git a/tools/testing/selftests/rseq/sched_state_test.c b/tools/testing/selftests/rseq/sched_state_test.c new file mode 100644 index 000000000000..47aeee6d980f --- /dev/null +++ b/tools/testing/selftests/rseq/sched_state_test.c @@ -0,0 +1,71 @@ +// SPDX-License-Identifier: LGPL-2.1 + +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include + +#include "rseq.h" + +static struct rseq_abi *target_thread; + +//TODO: +//Use rseq c.s. and rseq fence to protect access to remote thread's rseq_abi. + +static +void show_sched_state(struct rseq_abi *rseq_thread) +{ + uint32_t state; + + state = rseq_thread->sched_state; + printf("Target thread: ON_CPU=%d\n", !!(state & RSEQ_SCHED_STATE_ON_CPU)); +} + + +static +void *test_thread(void *arg) +{ + int i; + + for (i = 0; i < 1000; i++) { + show_sched_state(target_thread); + (void) poll(NULL, 0, 100); + } + return NULL; +} + +int main(int argc, char **argv) +{ + pthread_t test_thread_id; + int i; + + if (rseq_register_current_thread()) { + fprintf(stderr, "Error: rseq_register_current_thread(...) failed(%d): %s\n", + errno, strerror(errno)); + goto init_thread_error; + } + target_thread = rseq_get_abi(); + + pthread_create(&test_thread_id, NULL, test_thread, NULL); + + for (i = 0; i < 1000000000; i++) + rseq_barrier(); + //for (i = 0; i < 10000; i++) + // (void) poll(NULL, 0, 75); + + pthread_join(test_thread_id, NULL); + + if (rseq_unregister_current_thread()) { + fprintf(stderr, "Error: rseq_unregister_current_thread(...) failed(%d): %s\n", + errno, strerror(errno)); + goto init_thread_error; + } + return 0; + +init_thread_error: + return -1; +}