From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id AD1AEC7EE2E for ; Wed, 17 May 2023 15:27:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232347AbjEQP1j (ORCPT ); Wed, 17 May 2023 11:27:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56210 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232363AbjEQP1V (ORCPT ); Wed, 17 May 2023 11:27:21 -0400 Received: from smtpout.efficios.com (unknown [IPv6:2607:5300:203:b2ee::31e5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D1192A261; Wed, 17 May 2023 08:27:05 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=efficios.com; s=smtpout1; t=1684337225; bh=hT9e3gv7K/FNrNBkQsoKYl28jg6kolO72kzwOKl/7ck=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=UjGsLJnTOSUJZOGX0pqCxp8UmKu2QdKVAklVv8sMFxW1hxxk++1JTMec8yzzJ6hGh zIIW4DzYCAbghenGdcrjT75Hcxqkqajd/mYKc66SW3Fhv2WJOOmtc+xebg2gfvgVj6 kA2uFSkq0/jqGRBAPYr8ZATbBYMUd0wrT6ze56z8pu9GZsL+O1sxiar99KFWT5OpvM dpEUejnQcO86WBJpOrezhhfLL/0CZRanKTuyAP3pIu+mtBmpEmDs1EdDuWlUUWAPXY B4GXxIzf2lu1/2I+roCswqmNGsSGDjTC42eeehii0YE/RAGjlE5GnJe3REOoujQZzZ pWYQq+ne1phFA== Received: from localhost.localdomain (192-222-143-198.qc.cable.ebox.net [192.222.143.198]) by smtpout.efficios.com (Postfix) with ESMTPSA id 4QLxmS504rz12wc; Wed, 17 May 2023 11:27:04 -0400 (EDT) From: Mathieu Desnoyers To: Peter Zijlstra Cc: linux-kernel@vger.kernel.org, Thomas Gleixner , "Paul E . 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=20Almeida?= , 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 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-api@vger.kernel.org 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; +} -- 2.25.1