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=-5.6 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 autolearn=no 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 C4681C433E2 for ; Mon, 31 Aug 2020 18:13:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A697720866 for ; Mon, 31 Aug 2020 18:13:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598897639; bh=DF0izavjdmeGeaXgA0B2pSC/Buesr/ysHUDE0xFp5m4=; h=Date:From:To:Cc:Subject:Reply-To:List-ID:From; b=IRlJYTGyteAx6XdubzpF10K/Lp2O36NCGWrDLtHl1nOQwcurT0TGFeXScDq0/uASl xMnoMCA0TgtDc5AoKwGhQDOwNoOIml63j0arVDZROLL5elwXgyQm4z/BZlX9SiKQfe +ym87q3+MxJIt+m74vsuSU3b3k/7fMz6tn0Cmu1Q= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729216AbgHaSN5 (ORCPT ); Mon, 31 Aug 2020 14:13:57 -0400 Received: from mail.kernel.org ([198.145.29.99]:41858 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725993AbgHaSN4 (ORCPT ); Mon, 31 Aug 2020 14:13:56 -0400 Received: from paulmck-ThinkPad-P72.home (unknown [50.45.173.55]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8C9532068E; Mon, 31 Aug 2020 18:13:56 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1598897636; bh=DF0izavjdmeGeaXgA0B2pSC/Buesr/ysHUDE0xFp5m4=; h=Date:From:To:Cc:Subject:Reply-To:From; b=bDk3gdg/OnvlYX8v8+tw2nR0ufAB8Bu5ASufxJrGy8dRGVyvSds35w5R3iAHvB7W/ /Dt7emqhgmtnFfaUgJUFDAe+2AjrPYm/NsPfVgyEk3soesubW/YEr0a7CoUZWalHBh ECOI6XriDy4CRyT5n0ZiN1eUyJe11zlmsJMEBouI= Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id 6ED5035230F1; Mon, 31 Aug 2020 11:13:56 -0700 (PDT) Date: Mon, 31 Aug 2020 11:13:56 -0700 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, 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 Subject: [PATCH tip/core/rcu 0/4] Add smp_call_function() debugging for v5.10 Message-ID: <20200831181356.GA1224@paulmck-ThinkPad-P72> Reply-To: paulmck@kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.9.4 (2018-02-28) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello! This series adds debugging code for stalled smp_call_function() handlers: 1. Add backtrace_idle parameter to force backtrace of idle CPUs. 2. Add source and destination CPUs to __call_single_data. 3. kernel/smp: Provide CSD lock timeout diagnostics. 4. Make symbol 'csd_bug_count' static. Thanx, Paul ------------------------------------------------------------------------ Documentation/admin-guide/kernel-parameters.txt | 4 include/linux/smp.h | 3 include/linux/smp_types.h | 3 kernel/smp.c | 136 +++++++++++++++++++++++- lib/Kconfig.debug | 11 + lib/nmi_backtrace.c | 6 - 6 files changed, 161 insertions(+), 2 deletions(-)