From patchwork Tue Nov 12 14:51:55 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Frederic Weisbecker X-Patchwork-Id: 13872358 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 E956D1FC7FF; Tue, 12 Nov 2024 14:52:54 +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=1731423175; cv=none; b=bdXk2PJH71nGFkBuT7pz44HZEJfBYB8YCq7cYAXUk+NcCie8P/4/dOlGg6ZIV4UFsTe2DrsPvAlFbZpaqKgqpzuf9xaYI5GjjVRSANf/sUdS8X1TfdWrypJ9M2/h+EXOffA5Jp0Vr/cjqfMS+juEQVW9x0KSyX/c4hs8PJ8SJWk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1731423175; c=relaxed/simple; bh=nwvp2zP98ddDicB9bTU8Bfx4YUep7GYbMP51FFzAyzI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Bwife1PDpoyOUTVsivN/b2OeowlTtCrEcpFlZPaBcr4IvADongW4OgcMdoz6kYZ7WNZ21w/yjzAeyn6rbKxz5ja9apN3Bv/ht6OnZUSxfrilrZeriQtZYCsefuQ/3FT1s8a9yWkrXtozgwMp8yFigqZVz2y9+C/BxpJTJWNbRNo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=tfbzR/zI; 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="tfbzR/zI" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D8A4EC4CED5; Tue, 12 Nov 2024 14:52:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1731423174; bh=nwvp2zP98ddDicB9bTU8Bfx4YUep7GYbMP51FFzAyzI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=tfbzR/zIwPybRU4kHWdRwXJC90OaHRePLkpfDo6BXICoCko2XfJ3ITVSRCo8f57pY EOoVZySC+3ln6C3ei5iOL3L9IFMINF6htbqW2Vc/vWhqHlV77Of2B/ogmT3RNauq5C k28UrH8JTCg+VWkxxuQwMqyN03puoGx0gfvTQDJWaFAfBu3IiYaAWvqqXm1qF6cqrk YtWcJeM3U61O1M0+fAej6UgO5+s7LcwJoXkjda1NUG1V7e+qUOgtcXxKApmmuNnZQ8 irl2ywmN84qDYqB4ECwqWTH34DY8jZ/g2hvwxTXvM25DKAbIzEv+dRFVmhUgk3qQ+x sYDC3FEKB45iA== From: Frederic Weisbecker To: LKML Cc: "Paul E. McKenney" , Boqun Feng , Joel Fernandes , Josh Triplett , Lai Jiangshan , Mathieu Desnoyers , Neeraj Upadhyay , Steven Rostedt , Uladzislau Rezki , Zqiang , rcu , Alexei Starovoitov , Andrii Nakryiko , Peter Zijlstra , Kent Overstreet , bpf@vger.kernel.org, Neeraj Upadhyay , Frederic Weisbecker Subject: [PATCH 12/16] rcutorture: Add reader_flavor parameter for SRCU readers Date: Tue, 12 Nov 2024 15:51:55 +0100 Message-ID: <20241112145159.23032-13-frederic@kernel.org> X-Mailer: git-send-email 2.46.0 In-Reply-To: <20241112145159.23032-1-frederic@kernel.org> References: <20241112145159.23032-1-frederic@kernel.org> Precedence: bulk X-Mailing-List: rcu@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 From: "Paul E. McKenney" 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: Reviewed-by: Neeraj Upadhyay Signed-off-by: Frederic Weisbecker --- .../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/Documentation/admin-guide/kernel-parameters.txt index 1518343bbe22..52922727006f 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. + rcutorture.reader_flavor= [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= [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 f96ab98f8182..405decec3367 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -111,6 +111,7 @@ torture_param(int, nocbs_nthreads, 0, "Number of NOCB toggle 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 episodes (s)"); torture_param(int, read_exit_burst, 16, "# of read-then-exit bursts per episode, 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 shuffles"); torture_param(int, shutdown_secs, 0, "Shutdown time (s), <= zero to disable."); 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 long *gp_seq) static int srcu_torture_read_lock(void) { - if (cur_ops == &srcud_ops) - return srcu_read_lock_nmisafe(srcu_ctlp); - else - return srcu_read_lock(srcu_ctlp); + int idx; + int ret = 0; + + if ((reader_flavor & 0x1) || !(reader_flavor & 0x7)) { + idx = srcu_read_lock(srcu_ctlp); + WARN_ON_ONCE(idx & ~0x1); + ret += idx; + } + if (reader_flavor & 0x2) { + idx = srcu_read_lock_nmisafe(srcu_ctlp); + WARN_ON_ONCE(idx & ~0x1); + ret += idx << 1; + } + return ret; } static void @@ -671,10 +682,11 @@ srcu_read_delay(struct torture_random_state *rrsp, struct rt_read_seg *rtrsp) static void srcu_torture_read_unlock(int idx) { - if (cur_ops == &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); } 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=%d " "onoff_interval=%d onoff_holdoff=%d " "read_exit_delay=%d read_exit_burst=%d " + "reader_flavor=%x " "nocbs_nthreads=%d nocbs_toggle=%d " "test_nmis=%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); }