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McKenney" , Uladzislau Rezki , Zqiang , rcu Subject: [PATCH 0/8] rcu: Fix expedited GP deadlock (and cleanup some nocb stuff) Date: Fri, 8 Dec 2023 23:05:37 +0100 Message-ID: <20231208220545.7452-1-frederic@kernel.org> X-Mailer: git-send-email 2.42.1 MIME-Version: 1.0 X-Spam-Status: No, score=-1.2 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on fry.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (fry.vger.email [0.0.0.0]); Fri, 08 Dec 2023 14:06:13 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1784753084135896392 X-GMAIL-MSGID: 1784753084135896392 TREE04 can trigger a writer stall if run with memory pressure. This is due to a circular dependency between waiting for expedited grace period and polling on expedited grace period when workqueues go back to mayday serialization. Here is a proposal fix. Frederic Weisbecker (8): rcu/nocb: Make IRQs disablement symetric rcu/nocb: Re-arrange call_rcu() NOCB specific code rcu/exp: Fix RCU expedited parallel grace period kworker allocation failure recovery rcu/exp: Handle RCU expedited grace period kworker allocation failure rcu: s/boost_kthread_mutex/kthread_mutex rcu/exp: Make parallel exp gp kworker per rcu node rcu/exp: Handle parallel exp gp kworkers affinity rcu/exp: Remove rcu_par_gp_wq kernel/rcu/rcu.h | 5 - kernel/rcu/tree.c | 222 +++++++++++++++++++++++++-------------- kernel/rcu/tree.h | 12 +-- kernel/rcu/tree_exp.h | 81 +++----------- kernel/rcu/tree_nocb.h | 38 ++++--- kernel/rcu/tree_plugin.h | 52 ++------- 6 files changed, 191 insertions(+), 219 deletions(-)