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 X-Spam-Level: X-Spam-Status: No, score=-19.7 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 83337C433B4 for ; Tue, 11 May 2021 22:53:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6609D61260 for ; Tue, 11 May 2021 22:53:23 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230477AbhEKWy2 (ORCPT ); Tue, 11 May 2021 18:54:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:33900 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230268AbhEKWyO (ORCPT ); Tue, 11 May 2021 18:54:14 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 050AD61937; Tue, 11 May 2021 22:53:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1620773587; bh=msoNn3F/3mMAWHlQO41JH41TKO4DJu3n00p097tSHDA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=G9M20CAYLthzVsdVmHwReGZD3EDUvgQ5ASyYkZzsI5bFasZqfUaYZcGZiQLFEdztP F2OhT+0c5xs8SKgtupNvW2pxymi5kVQkz05HnKvu3bB2G/5I9RVYxvpMP4sFRqtpUx EtxP62CmZtB7wJyche0f90+lctxxEp0DCkpFSnT9SyehjEJlR93bu/Ayzyg/Vq+lye YrI/1wN6kfDUoWf+2eNCiUenxuyQfvVTDNEf4GABQwUNW3rS3xwnQMMoW4XtujcvL0 N4tWhfYjU0LD5lGB5nBtmm4zjpUjqCC1iHVDkUGfBNEpdIfY0aCl1ZDW9eWNDiJ0Xk GomyH0MRDxSJw== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 925B45C0DB3; Tue, 11 May 2021 15:53:06 -0700 (PDT) From: "Paul E. McKenney" To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com, mingo@kernel.org, jiangshanlai@gmail.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 06/19] rcu: Add ->gp_max to show_rcu_gp_kthreads() output Date: Tue, 11 May 2021 15:52:51 -0700 Message-Id: <20210511225304.2893154-6-paulmck@kernel.org> X-Mailer: git-send-email 2.31.1.189.g2e36527f23 In-Reply-To: <20210511225241.GA2893003@paulmck-ThinkPad-P17-Gen-1> References: <20210511225241.GA2893003@paulmck-ThinkPad-P17-Gen-1> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This commit adds ->gp_max to show_rcu_gp_kthreads() output in order to better diagnose RCU priority boosting failures. Signed-off-by: Paul E. McKenney --- kernel/rcu/tree_stall.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h index fb4702570316..a4e2bb3bdce7 100644 --- a/kernel/rcu/tree_stall.h +++ b/kernel/rcu/tree_stall.h @@ -737,12 +737,13 @@ void show_rcu_gp_kthreads(void) jr = j - data_race(rcu_state.gp_req_activity); js = j - data_race(rcu_state.gp_start); jw = j - data_race(rcu_state.gp_wake_time); - pr_info("%s: wait state: %s(%d) ->state: %#lx ->rt_priority %u delta ->gp_start %lu ->gp_activity %lu ->gp_req_activity %lu ->gp_wake_time %lu ->gp_wake_seq %ld ->gp_seq %ld ->gp_seq_needed %ld ->gp_flags %#x\n", + pr_info("%s: wait state: %s(%d) ->state: %#lx ->rt_priority %u delta ->gp_start %lu ->gp_activity %lu ->gp_req_activity %lu ->gp_wake_time %lu ->gp_wake_seq %ld ->gp_seq %ld ->gp_seq_needed %ld ->gp_max %lu ->gp_flags %#x\n", rcu_state.name, gp_state_getname(rcu_state.gp_state), rcu_state.gp_state, t ? t->state : 0x1ffffL, t ? t->rt_priority : 0xffU, js, ja, jr, jw, (long)data_race(rcu_state.gp_wake_seq), (long)data_race(rcu_state.gp_seq), (long)data_race(rcu_get_root()->gp_seq_needed), + data_race(rcu_state.gp_max), data_race(rcu_state.gp_flags)); rcu_for_each_node_breadth_first(rnp) { if (ULONG_CMP_GE(READ_ONCE(rcu_state.gp_seq), -- 2.31.1.189.g2e36527f23