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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 ECF0BC2BA19 for ; Wed, 15 Apr 2020 17:24:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id CBA9D20737 for ; Wed, 15 Apr 2020 17:24:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586971468; bh=ce0/MOFaWROP/28uCZGVwEiWJofn9fNNRJUP1FcJJSo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=Kt/y2AeC41dFPcHEtZh3Dl2veARxaylcZ/bKqexa5tiSY6tAvo5pYZt4RtVHC9sOX FhOai3Bb7IKsRKqMTyFWE7PsmMKOvMDyoIwYPRdg/bynBr61p5q69RDcU8vUUzfz+z B+wOQhD8mExeANzaUY0sjWQFojLYSZPe3vpM60Y0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2410955AbgDORYX (ORCPT ); Wed, 15 Apr 2020 13:24:23 -0400 Received: from mail.kernel.org ([198.145.29.99]:37984 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2410926AbgDORYG (ORCPT ); Wed, 15 Apr 2020 13:24:06 -0400 Received: from paulmck-ThinkPad-P72.home (50-39-105-78.bvtn.or.frontiernet.net [50.39.105.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C78B6215A4; Wed, 15 Apr 2020 17:24:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1586971446; bh=ce0/MOFaWROP/28uCZGVwEiWJofn9fNNRJUP1FcJJSo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FGrA3+8ccJ5VD5tLp1pOT3P4Rlt6igp5YmOlHvSz0fnH6Qo91G+N+ueaMFXZFWyjI tS6sPSaNUvzd7V8ZooB1Go7Xq1fksMgJtIadzjF8gRnvRgpF8vKn0PtB3WhlYfSjMf sVd/wQaZn8JBNdwtqGcH2VQpFJBtDRZzvSowF81g= From: paulmck@kernel.org To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com, 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 3/3] rcu: Remove self-stack-trace when all quiescent states seen Date: Wed, 15 Apr 2020 10:24:03 -0700 Message-Id: <20200415172403.9647-3-paulmck@kernel.org> X-Mailer: git-send-email 2.9.5 In-Reply-To: <20200415172341.GA9519@paulmck-ThinkPad-P72> References: <20200415172341.GA9519@paulmck-ThinkPad-P72> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Paul E. McKenney" When all quiescent states have been seen, it is normally the grace-period kthread that is in trouble. Although the existing stack trace from the current CPU might possibly provide useful information, experience indicates that there is too much noise for this to be worthwhile. This commit therefore removes this stack trace from the output. Signed-off-by: Paul E. McKenney --- kernel/rcu/tree_stall.h | 2 -- 1 file changed, 2 deletions(-) diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h index 4da41a6..535762b 100644 --- a/kernel/rcu/tree_stall.h +++ b/kernel/rcu/tree_stall.h @@ -440,8 +440,6 @@ static void print_other_cpu_stall(unsigned long gp_seq) rcu_state.name, j - gpa, j, gpa, READ_ONCE(jiffies_till_next_fqs), rcu_get_root()->qsmask); - /* In this case, the current CPU might be at fault. */ - sched_show_task(current); } } /* Rewrite if needed in case of slow consoles. */ -- 2.9.5