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McKenney" , Frederic Weisbecker , Neeraj Upadhyay , Josh Triplett , Boqun Feng , Uladzislau Rezki , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , Zqiang , Davidlohr Bueso , Joel Fernandes , rcu@vger.kernel.org Subject: [PATCH v3 09/14] rcutorture: Abstract reader-segment dump into rcu_torture_dump_read_segs() Date: Thu, 18 Jun 2026 14:50:25 -0400 Message-Id: <20260618185030.376450-10-joelagnelf@nvidia.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260618185030.376450-1-joelagnelf@nvidia.com> References: <20260618185030.376450-1-joelagnelf@nvidia.com> Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: BLAPR03CA0054.namprd03.prod.outlook.com (2603:10b6:208:32d::29) To DS0PR12MB6486.namprd12.prod.outlook.com (2603:10b6:8:c5::21) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DS0PR12MB6486:EE_|SJ2PR12MB9088:EE_ X-MS-Office365-Filtering-Correlation-Id: 0b5da932-f45c-4f16-b6ad-08decd6a9ab1 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|7416014|366016|376014|23010399003|1800799024|56012099006|11063799006|6133799003|18002099003|22082099003; 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McKenney" This commit abstracts the open-coded dumping of reader segments in the rcu_torture_cleanup() function into a new rcu_torture_dump_read_segs() function. This abstraction will allow reader segments to be dumped for other purposes. Signed-off-by: Paul E. McKenney Signed-off-by: Joel Fernandes --- kernel/rcu/rcutorture.c | 148 +++++++++++++++++++++------------------- 1 file changed, 76 insertions(+), 72 deletions(-) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 5f2848b828dc..42f94c62c18a 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -2378,6 +2378,80 @@ struct rcu_torture_one_read_state { unsigned long long ts; }; +static void rcu_torture_dump_read_segs(struct rt_read_seg *rrsp, int nsegs) +{ + bool firsttime; + int i; + int j; + + firsttime = 1; + for (i = 0; i < nsegs; i++) { + if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_LOG_GP)) + pr_alert("\t%lluus ", div64_u64(rrsp[i].rt_ts, 1000ULL)); + else + pr_alert("\t"); + pr_cont("%d: %#4x", i, rrsp[i].rt_readstate); + if (rrsp[i].rt_delay_jiffies != 0) { + pr_cont("%s%ldjiffies", firsttime ? "" : "+", + rrsp[i].rt_delay_jiffies); + firsttime = 0; + } + if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_LOG_CPU)) { + pr_cont(" CPU %2d", rrsp[i].rt_cpu); + if (rrsp[i].rt_cpu != rrsp[i].rt_end_cpu) + pr_cont("->%-2d", rrsp[i].rt_end_cpu); + else + pr_cont(" ..."); + } + if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_LOG_GP) && + cur_ops->gather_gp_seqs && cur_ops->format_gp_seqs) { + char buf1[20+1]; + char buf2[20+1]; + char sepchar = '-'; + + cur_ops->format_gp_seqs(rrsp[i].rt_gp_seq, buf1, ARRAY_SIZE(buf1)); + cur_ops->format_gp_seqs(rrsp[i].rt_gp_seq_end, buf2, ARRAY_SIZE(buf2)); + if (rrsp[i].rt_gp_seq == rrsp[i].rt_gp_seq_end) { + if (buf2[0]) { + for (j = 0; buf2[j]; j++) + buf2[j] = '.'; + if (j) + buf2[j - 1] = ' '; + } + sepchar = ' '; + } + pr_cont(" %s%c%s", buf1, sepchar, buf2); + } + if (rrsp[i].rt_delay_ms != 0) { + pr_cont(" %s%ldms", firsttime ? "" : "+", rrsp[i].rt_delay_ms); + firsttime = 0; + } + if (rrsp[i].rt_delay_us != 0) { + pr_cont(" %s%ldus", firsttime ? "" : "+", rrsp[i].rt_delay_us); + firsttime = 0; + } + pr_cont("%s", rrsp[i].rt_preempted ? " preempted" : ""); + if (rrsp[i].rt_readstate & RCUTORTURE_RDR_BH) + pr_cont(" BH"); + if (rrsp[i].rt_readstate & RCUTORTURE_RDR_IRQ) + pr_cont(" IRQ"); + if (rrsp[i].rt_readstate & RCUTORTURE_RDR_PREEMPT) + pr_cont(" PREEMPT"); + if (rrsp[i].rt_readstate & RCUTORTURE_RDR_RBH) + pr_cont(" RBH"); + if (rrsp[i].rt_readstate & RCUTORTURE_RDR_SCHED) + pr_cont(" SCHED"); + if (rrsp[i].rt_readstate & RCUTORTURE_RDR_RCU_1) + pr_cont(" RCU_1"); + if (rrsp[i].rt_readstate & RCUTORTURE_RDR_RCU_2) + pr_cont(" RCU_2"); + pr_cont("\n"); + + } + if (rt_read_preempted) + pr_alert("\tReader was preempted.\n"); +} + static void init_rcu_torture_one_read_state(struct rcu_torture_one_read_state *rtorsp, struct torture_random_state *trsp) { @@ -4071,11 +4145,9 @@ static void rcu_gpwrap_lag_cleanup(void) static void rcu_torture_cleanup(void) { - int firsttime; int flags = 0; unsigned long gp_seq = 0; int i; - int j; if (torture_cleanup_begin()) { if (cur_ops->cb_barrier != NULL) { @@ -4160,76 +4232,8 @@ rcu_torture_cleanup(void) pr_alert("Failure/close-call rcutorture reader segments:\n"); if (rt_read_nsegs == 0) pr_alert("\t: No segments recorded!!!\n"); - firsttime = 1; - for (i = 0; i < rt_read_nsegs; i++) { - if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_LOG_GP)) - pr_alert("\t%lluus ", div64_u64(err_segs[i].rt_ts, 1000ULL)); - else - pr_alert("\t"); - pr_cont("%d: %#4x", i, err_segs[i].rt_readstate); - if (err_segs[i].rt_delay_jiffies != 0) { - pr_cont("%s%ldjiffies", firsttime ? "" : "+", - err_segs[i].rt_delay_jiffies); - firsttime = 0; - } - if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_LOG_CPU)) { - pr_cont(" CPU %2d", err_segs[i].rt_cpu); - if (err_segs[i].rt_cpu != err_segs[i].rt_end_cpu) - pr_cont("->%-2d", err_segs[i].rt_end_cpu); - else - pr_cont(" ..."); - } - if (IS_ENABLED(CONFIG_RCU_TORTURE_TEST_LOG_GP) && - cur_ops->gather_gp_seqs && cur_ops->format_gp_seqs) { - char buf1[20+1]; - char buf2[20+1]; - char sepchar = '-'; - - cur_ops->format_gp_seqs(err_segs[i].rt_gp_seq, - buf1, ARRAY_SIZE(buf1)); - cur_ops->format_gp_seqs(err_segs[i].rt_gp_seq_end, - buf2, ARRAY_SIZE(buf2)); - if (err_segs[i].rt_gp_seq == err_segs[i].rt_gp_seq_end) { - if (buf2[0]) { - for (j = 0; buf2[j]; j++) - buf2[j] = '.'; - if (j) - buf2[j - 1] = ' '; - } - sepchar = ' '; - } - pr_cont(" %s%c%s", buf1, sepchar, buf2); - } - if (err_segs[i].rt_delay_ms != 0) { - pr_cont(" %s%ldms", firsttime ? "" : "+", - err_segs[i].rt_delay_ms); - firsttime = 0; - } - if (err_segs[i].rt_delay_us != 0) { - pr_cont(" %s%ldus", firsttime ? "" : "+", - err_segs[i].rt_delay_us); - firsttime = 0; - } - pr_cont("%s", err_segs[i].rt_preempted ? " preempted" : ""); - if (err_segs[i].rt_readstate & RCUTORTURE_RDR_BH) - pr_cont(" BH"); - if (err_segs[i].rt_readstate & RCUTORTURE_RDR_IRQ) - pr_cont(" IRQ"); - if (err_segs[i].rt_readstate & RCUTORTURE_RDR_PREEMPT) - pr_cont(" PREEMPT"); - if (err_segs[i].rt_readstate & RCUTORTURE_RDR_RBH) - pr_cont(" RBH"); - if (err_segs[i].rt_readstate & RCUTORTURE_RDR_SCHED) - pr_cont(" SCHED"); - if (err_segs[i].rt_readstate & RCUTORTURE_RDR_RCU_1) - pr_cont(" RCU_1"); - if (err_segs[i].rt_readstate & RCUTORTURE_RDR_RCU_2) - pr_cont(" RCU_2"); - pr_cont("\n"); - - } - if (rt_read_preempted) - pr_alert("\tReader was preempted.\n"); + else + rcu_torture_dump_read_segs(err_segs, rt_read_nsegs); } if (atomic_read(&n_rcu_torture_error) || n_rcu_torture_barrier_error) rcu_torture_print_module_parms(cur_ops, "End of test: FAILURE"); -- 2.34.1