From nobody Mon Feb 9 15:25:55 2026 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 9168AC7EE2C for ; Mon, 29 May 2023 19:14:41 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229737AbjE2TOj (ORCPT ); Mon, 29 May 2023 15:14:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:50848 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229676AbjE2TO1 (ORCPT ); Mon, 29 May 2023 15:14:27 -0400 Received: from smtpout.efficios.com (unknown [IPv6:2607:5300:203:b2ee::31e5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3B90DD9; Mon, 29 May 2023 12:14:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=efficios.com; s=smtpout1; t=1685387663; bh=1NSDvuKZlkj1LDG55Opnc9arEf2CDBA5sWooOa0Auxs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=E+nmIA9jjhGxSVcQWQ1eh0PMnpHNNfD6o9CBD+CE/oKRJutzuFGKqFXTzkuQ3vlHR +srFPLRlhguoA+SYIAbp2Y80lBYBP8/sVMMuFZjOO8TomJeAkBd/oHgtqHKET1L/jE Oq+sdX9bwUXsbfwjQ1TUad7wjJoJvyq4l5NiCSUFlorVyqzmqn8KCQdYd0PDkQDKke rMm2TI/P4A++PEXnsUgm17wwUCo1q7HtISOODP7xtmJOwVXzNjY5xP9XCLnkP13faU dvZd1sCtXlMDSGDDskruo6k2GnQ2obToX5tEaMZD6S6g95kTQbdLD9TnsB3M2w4yjk 7ljd78EzhMOCg== Received: from localhost.localdomain (192-222-143-198.qc.cable.ebox.net [192.222.143.198]) by smtpout.efficios.com (Postfix) with ESMTPSA id 4QVQFC0n9Jz165Q; Mon, 29 May 2023 15:14:23 -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 , Noah Goldstein , Daniel Colascione , longman@redhat.com, Mathieu Desnoyers Subject: [RFC PATCH v2 3/4] selftests/rseq: Implement sched state test program Date: Mon, 29 May 2023 15:14:15 -0400 Message-Id: <20230529191416.53955-4-mathieu.desnoyers@efficios.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20230529191416.53955-1-mathieu.desnoyers@efficios.com> References: <20230529191416.53955-1-mathieu.desnoyers@efficios.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" 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 | 72 +++++++++++++++++++ 3 files changed, 74 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/selfte= sts/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/selftest= s/rseq/Makefile index b357ba24af06..7c8f4f2be74c 100644 --- a/tools/testing/selftests/rseq/Makefile +++ b/tools/testing/selftests/rseq/Makefile @@ -14,7 +14,7 @@ OVERRIDE_TARGETS =3D 1 =20 TEST_GEN_PROGS =3D basic_test basic_percpu_ops_test basic_percpu_ops_mm_ci= d_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 =20 TEST_GEN_PROGS_EXTENDED =3D librseq.so =20 diff --git a/tools/testing/selftests/rseq/sched_state_test.c b/tools/testin= g/selftests/rseq/sched_state_test.c new file mode 100644 index 000000000000..5196b0dd897a --- /dev/null +++ b/tools/testing/selftests/rseq/sched_state_test.c @@ -0,0 +1,72 @@ +// SPDX-License-Identifier: LGPL-2.1 + +#define _GNU_SOURCE +#include +#include +#include +#include +#include +#include +#include + +#include "rseq.h" + +static struct rseq_abi_sched_state *target_thread_state; + +//TODO: +//Use rseq c.s. and rseq fence to protect access to remote thread's rseq_a= bi. + +static +void show_sched_state(struct rseq_abi_sched_state *rseq_thread_state) +{ + uint32_t state; + + state =3D rseq_thread_state->state; + printf("Target thread: %u, ON_CPU=3D%d\n", + rseq_thread_state->tid, + !!(state & RSEQ_ABI_SCHED_STATE_FLAG_ON_CPU)); +} + +static +void *test_thread(void *arg) +{ + int i; + + for (i =3D 0; i < 1000; i++) { + show_sched_state(target_thread_state); + (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_state =3D rseq_get_sched_state(rseq_get_abi()); + + pthread_create(&test_thread_id, NULL, test_thread, NULL); + + for (i =3D 0; i < 1000000000; i++) + rseq_barrier(); + //for (i =3D 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; +} --=20 2.25.1