From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9927AC10DCE for ; Fri, 8 Dec 2023 22:06:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1574843AbjLHWGF (ORCPT ); Fri, 8 Dec 2023 17:06:05 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:37030 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1574835AbjLHWFq (ORCPT ); Fri, 8 Dec 2023 17:05:46 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 23DDE10E0 for ; Fri, 8 Dec 2023 14:05:53 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6A29DC433C7; Fri, 8 Dec 2023 22:05:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1702073152; bh=CgYvOu578AFfLRbBC6EHcv8SUptcV6n5XjcrCPA7nDI=; h=From:To:Cc:Subject:Date:From; b=Pw+MKktqBiWhUgo6VfuY7O/2yoxIeItlKxQdYL8fX1bz1s/zy7Ihk79bC/wo1Bxzi uRBhcWs2U2UYM8pajpvAJQqhLS1aJEJRK3lZWjiB/Kbo2QkALyO58X3A+D0NApzlhs Bn8MOA1bGIAehpbs4DsmTNLqnsEvc+owbWRKAMWST3L6qc9VgdnxnPkdwwF1GDQ9ft Gv8/IyjFjDnOlait/gfqbobtCiex+zCxlqD/+1oAvQaJ8mGK9w38VwSjdMgdTa4A87 lZqYCSKGDMU3PDjsZgd5PKusJFY5k5lUn0Nhnu4KjvGW4OcWko9ekeeaqzdFsFBZ7v jnjrxXCI3aBvA== From: Frederic Weisbecker To: LKML Cc: Frederic Weisbecker , Boqun Feng , Joel Fernandes , Neeraj Upadhyay , "Paul E . 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 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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(-) -- 2.42.1