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 D1FF6C433F5 for ; Mon, 10 Oct 2022 22:40:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229772AbiJJWkL (ORCPT ); Mon, 10 Oct 2022 18:40:11 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:58998 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229797AbiJJWkK (ORCPT ); Mon, 10 Oct 2022 18:40:10 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4162578BD6; Mon, 10 Oct 2022 15:40:09 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id ED40DB80E34; Mon, 10 Oct 2022 22:40:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 245DDC433C1; Mon, 10 Oct 2022 22:40:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1665441606; bh=0cKcSLCQOdzp5id98wc+RBwQs1pyzsIL5VN0NjeNlRo=; h=From:To:Cc:Subject:Date:From; b=UZ6SKJH0c7rUyzrJIAMr68lY07U3H1Xce7xvU/4A0IkDATfKZ9hf0X+CjDb1rIshZ GG2zP8XrMGiKnYDCh9L4JUyxMC1SG/Al51nirt/DQ8GcUgv4FoP/awVylCweFtfr/j TXg9sHq/9Tg+pymHCWPb9khANo+8QfLXU0Tt3nF8jX86kZOaZ4dFsrzgpqk1TIQtDf tdEfsbZcYZacG/js0747AFmumOa5tJ1tHNLF7Litek21wiVRq+cUtISjI5zwdmcRPh OWZwyo6gQK0aKpS6ky2zHIX3M87x/v/3Dyya5A4hYRX8GO5+WFKbl3nADFD9IWFKBN RTpmEEXj4lK0A== From: Frederic Weisbecker To: "Paul E . McKenney" Cc: LKML , Frederic Weisbecker , Joel Fernandes , rcu@vger.kernel.org, Neeraj Upadhyay , Uladzislau Rezki Subject: [PATCH 0/2] rcu/nocb fix and optimization Date: Tue, 11 Oct 2022 00:39:54 +0200 Message-Id: <20221010223956.1041247-1-frederic@kernel.org> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org I wanted to send this a few days ago but then I faced a TREE01 stall (rcu_barrier() related). I just couldn't remember if it was before or after these patches... But finally looking at the log, I found the head which is e8c56bb5baa6969bf2d01b8619f22f5a71818497 (an old RCU:dev head from more than a month ago, way before these patches). Phew! Anyway I re-launched many times TREE01 on latest RCU:dev before and after these patches, it has run both ways more than 600 hours without any issue... Frederic Weisbecker (2): rcu: Fix missing nocb gp wake on rcu_barrier() rcu/nocb: Spare bypass locking upon normal enqueue kernel/rcu/tree.c | 6 ++++++ kernel/rcu/tree.h | 1 + kernel/rcu/tree_nocb.h | 11 +++++++++-- 3 files changed, 16 insertions(+), 2 deletions(-) -- 2.25.1