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McKenney" To: linux-kernel@vger.kernel.org Cc: mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org, "Paul E. McKenney" Subject: [PATCH tip/core/rcu 19/27] rcu: Add diagnostics for rcutorture writer stall warning Date: Mon, 25 Jun 2018 17:35:05 -0700 X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180626003448.GA26209@linux.vnet.ibm.com> References: <20180626003448.GA26209@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18062600-0064-0000-0000-000003204529 X-IBM-SpamModules-Scores: X-IBM-SpamModules-Versions: BY=3.00009255; HX=3.00000241; KW=3.00000007; PH=3.00000004; SC=3.00000266; SDB=6.01052336; UDB=6.00539470; IPR=6.00830262; MB=3.00021855; MTD=3.00000008; XFM=3.00000015; UTC=2018-06-26 00:33:15 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18062600-0065-0000-0000-000039B764CE Message-Id: <20180626003513.27812-19-paulmck@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:,, definitions=2018-06-25_11:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 mlxscore=0 impostorscore=0 mlxlogscore=999 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1806210000 definitions=main-1806260005 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This commit adds any in-the-future ->gp_seq_needed fields to the diagnostics for an rcutorture writer stall warning message. Signed-off-by: Paul E. McKenney --- kernel/rcu/tree.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index c5fec335bc31..bc1ed77a3df9 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -606,11 +606,32 @@ EXPORT_SYMBOL_GPL(rcu_sched_force_quiescent_state); */ void show_rcu_gp_kthreads(void) { + int cpu; + struct rcu_data *rdp; + struct rcu_node *rnp; struct rcu_state *rsp; for_each_rcu_flavor(rsp) { pr_info("%s: wait state: %d ->state: %#lx\n", rsp->name, rsp->gp_state, rsp->gp_kthread->state); + rcu_for_each_node_breadth_first(rsp, rnp) { + if (ULONG_CMP_GE(rsp->gp_seq, rnp->gp_seq_needed)) + continue; + pr_info("\trcu_node %d:%d ->gp_seq %lu ->gp_seq_needed %lu\n", + rnp->grplo, rnp->grphi, rnp->gp_seq, + rnp->gp_seq_needed); + if (!rcu_is_leaf_node(rnp)) + continue; + for_each_leaf_node_possible_cpu(rnp, cpu) { + rdp = per_cpu_ptr(rsp->rda, cpu); + if (rdp->gpwrap || + ULONG_CMP_GE(rsp->gp_seq, + rdp->gp_seq_needed)) + continue; + pr_info("\tcpu %d ->gp_seq_needed %lu\n", + cpu, rdp->gp_seq_needed); + } + } /* sched_show_task(rsp->gp_kthread); */ } } -- 2.17.1