From nobody Wed Nov 27 08:25:40 2024 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id AB8691C8FC1; Fri, 11 Oct 2024 17:39:33 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728668373; cv=none; b=QiIagrMLGsIOFdQFsez8A/7GSGXUfbFk0T7s/yC1gOQHnbwraOqLxPn60aGQAyaz+f5ZO4HYn7dWoYOPNF8PPgZbAQXtGjWr/Q48k02hAaIV3zRA9JCPaqxUG7QYfBLnNNaqQV1q3n1YW95Giy+oogntqLshX4FXkkpg+qv3N/k= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1728668373; c=relaxed/simple; bh=USWy1f2+MRE4E6Ag+HiaCUvOKEVnE9SJTDypoSyYrTo=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=N4qDN1q2r7u5I9FWNKgGVm0fPpGobyOAuX43/b3FTV2sv5GwBDc5Clfsh+Str8yF9EBr9+bXufxF88zYyVaFtVuZdGbZum4+Gx7NL3HeanryXZlUpseNfLVome6qzVEqMIhDrOgXHGut/I6QJSI4FmLdJeMNjA8kfvTC6K2DcQY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=qWt70X3v; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="qWt70X3v" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 5471AC4CEE0; Fri, 11 Oct 2024 17:39:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1728668373; bh=USWy1f2+MRE4E6Ag+HiaCUvOKEVnE9SJTDypoSyYrTo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qWt70X3vWL4k1++QjbqhK9UTXcYfoXrqaN3XJc2cMveljYcrGtmmVMtfq4zYc1jgp dAc7XV0/Vj1QouUrgvGS9ytfnOkFnaVAiWd7/QvSOHo/GbggKfkhSEMm/FmG2pD4CZ Te9OmCZCqufJ0miu62e84WhJClzHpmYoHJQ6dCxXQdWr8uADAYN73WLbkdcNTm6GuB N5aUJRSNfJvJ1WGY8ib8FHlpkXgpx89wJprESjVSy+Frj98gaWgXDRwyHM+RV46Lab ojj9QPzPhfRH8jKojCu37UiLAKCUZYFtDEeDiaVm/bGjy0LDrP82erJlflQhFoqigq dxXb65Zf5uFCw== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id B037ECE0F96; Fri, 11 Oct 2024 10:39:32 -0700 (PDT) From: "Paul E. McKenney" To: frederic@kernel.org, rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, rostedt@goodmis.org, "Paul E. McKenney" , Alexei Starovoitov , Andrii Nakryiko , Peter Zijlstra , Kent Overstreet , bpf@vger.kernel.org Subject: [PATCH v2 rcu 09/13] rcutorture: Add reader_flavor parameter for SRCU readers Date: Fri, 11 Oct 2024 10:39:27 -0700 Message-Id: <20241011173931.2050422-9-paulmck@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <3b82ac1a-8786-4a27-8eff-ecc67b50dfb6@paulmck-laptop> References: <3b82ac1a-8786-4a27-8eff-ecc67b50dfb6@paulmck-laptop> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" This commit adds an rcutorture.reader_flavor parameter whose bits correspond to reader flavors. For example, SRCU's readers are 0x1 for normal and 0x2 for NMI-safe. Signed-off-by: Paul E. McKenney Cc: Alexei Starovoitov Cc: Andrii Nakryiko Cc: Peter Zijlstra Cc: Kent Overstreet Cc: --- .../admin-guide/kernel-parameters.txt | 8 +++++ kernel/rcu/rcutorture.c | 30 ++++++++++++++----- 2 files changed, 30 insertions(+), 8 deletions(-) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentatio= n/admin-guide/kernel-parameters.txt index 1518343bbe223..52922727006fc 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -5426,6 +5426,14 @@ The delay, in seconds, between successive read-then-exit testing episodes. =20 + rcutorture.reader_flavor=3D [KNL] + A bit mask indicating which readers to use. + If there is more than one bit set, the readers + are entered from low-order bit up, and are + exited in the opposite order. For SRCU, the + 0x1 bit is normal readers and the 0x2 bit is + for NMI-safe readers. + rcutorture.shuffle_interval=3D [KNL] Set task-shuffle interval (s). Shuffling tasks allows some CPUs to go into dyntick-idle mode diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index f96ab98f8182f..405decec33677 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -111,6 +111,7 @@ torture_param(int, nocbs_nthreads, 0, "Number of NOCB t= oggle threads, 0 to disab torture_param(int, nocbs_toggle, 1000, "Time between toggling nocb state (= ms)"); torture_param(int, read_exit_delay, 13, "Delay between read-then-exit epis= odes (s)"); torture_param(int, read_exit_burst, 16, "# of read-then-exit bursts per ep= isode, zero to disable"); +torture_param(int, reader_flavor, 0x1, "Reader flavors to use, one per bit= ."); torture_param(int, shuffle_interval, 3, "Number of seconds between shuffle= s"); torture_param(int, shutdown_secs, 0, "Shutdown time (s), <=3D zero to disa= ble."); torture_param(int, stall_cpu, 0, "Stall duration (s), zero to disable."); @@ -644,10 +645,20 @@ static void srcu_get_gp_data(int *flags, unsigned lon= g *gp_seq) =20 static int srcu_torture_read_lock(void) { - if (cur_ops =3D=3D &srcud_ops) - return srcu_read_lock_nmisafe(srcu_ctlp); - else - return srcu_read_lock(srcu_ctlp); + int idx; + int ret =3D 0; + + if ((reader_flavor & 0x1) || !(reader_flavor & 0x7)) { + idx =3D srcu_read_lock(srcu_ctlp); + WARN_ON_ONCE(idx & ~0x1); + ret +=3D idx; + } + if (reader_flavor & 0x2) { + idx =3D srcu_read_lock_nmisafe(srcu_ctlp); + WARN_ON_ONCE(idx & ~0x1); + ret +=3D idx << 1; + } + return ret; } =20 static void @@ -671,10 +682,11 @@ srcu_read_delay(struct torture_random_state *rrsp, st= ruct rt_read_seg *rtrsp) =20 static void srcu_torture_read_unlock(int idx) { - if (cur_ops =3D=3D &srcud_ops) - srcu_read_unlock_nmisafe(srcu_ctlp, idx); - else - srcu_read_unlock(srcu_ctlp, idx); + WARN_ON_ONCE((reader_flavor && (idx & ~reader_flavor)) || (!reader_flavor= && (idx & ~0x1))); + if (reader_flavor & 0x2) + srcu_read_unlock_nmisafe(srcu_ctlp, (idx & 0x2) >> 1); + if ((reader_flavor & 0x1) || !(reader_flavor & 0x7)) + srcu_read_unlock(srcu_ctlp, idx & 0x1); } =20 static int torture_srcu_read_lock_held(void) @@ -2389,6 +2401,7 @@ rcu_torture_print_module_parms(struct rcu_torture_ops= *cur_ops, const char *tag) "n_barrier_cbs=3D%d " "onoff_interval=3D%d onoff_holdoff=3D%d " "read_exit_delay=3D%d read_exit_burst=3D%d " + "reader_flavor=3D%x " "nocbs_nthreads=3D%d nocbs_toggle=3D%d " "test_nmis=3D%d\n", torture_type, tag, nrealreaders, nfakewriters, @@ -2401,6 +2414,7 @@ rcu_torture_print_module_parms(struct rcu_torture_ops= *cur_ops, const char *tag) n_barrier_cbs, onoff_interval, onoff_holdoff, read_exit_delay, read_exit_burst, + reader_flavor, nocbs_nthreads, nocbs_toggle, test_nmis); } --=20 2.40.1