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 BE9ECC55178 for ; Thu, 5 Nov 2020 23:00:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5ECB12071A for ; Thu, 5 Nov 2020 23:00:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604617242; bh=XlYp7OoLzkBs9gfBT6bydhG3emdrCfkQGkybFyyUB5Q=; h=Date:From:To:Cc:Subject:Reply-To:List-ID:From; b=B2jKd5uOv1WjugL+Zf0wqC+ceVZbEsXifZ5/WZioqNuNM+N4Att+2T0zI36zJSoNy yPDn7GLVKcNBuw5MLin22Zmbd7Qh3PjG8WIw+TZ8koIprYvr4M8Tj0GiXK0aTjWRpk c9XS9c4f24WsQbAj6Wq+lAB8VKfD09qCyEHzKtWc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732396AbgKEXAl (ORCPT ); Thu, 5 Nov 2020 18:00:41 -0500 Received: from mail.kernel.org ([198.145.29.99]:58416 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731860AbgKEXAl (ORCPT ); Thu, 5 Nov 2020 18:00:41 -0500 Received: from paulmck-ThinkPad-P72.home (50-39-104-11.bvtn.or.frontiernet.net [50.39.104.11]) (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 97F4920719; Thu, 5 Nov 2020 23:00:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604617240; bh=XlYp7OoLzkBs9gfBT6bydhG3emdrCfkQGkybFyyUB5Q=; h=Date:From:To:Cc:Subject:Reply-To:From; b=XRa7JCsv02I1Vi9GjZwzsSzKgJa58ZyBecwJnARej6SoTtEevpbUDGFaVzzX9nNip KhF9tZTmcPALuVlew09l8vehHHEU4Z4tM4VS1BspJLkOV62NxUhN6BmOjorA5vWnCJ jTfHfhR2CFRWUqcKORht5pcuB8ViJQYL34sQW6C4= Received: by paulmck-ThinkPad-P72.home (Postfix, from userid 1000) id 3DA0E3522A76; Thu, 5 Nov 2020 15:00:40 -0800 (PST) Date: Thu, 5 Nov 2020 15:00:40 -0800 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 Subject: [PATCH tip/core/rcu 0/2] smp_call_function updates for v5.11 Message-ID: <20201105230040.GA18202@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) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hello! This series prevents /proc/cpuinfo from piling up quite so many redundant IPIs, and also avoids IPIing idle CPUs. 1. Avoid cpuinfo-induced IPI pileups. 2. Avoid cpuinfo-induced IPIing of idle CPUs. Thanx, Paul ------------------------------------------------------------------------ arch/x86/kernel/cpu/aperfmperf.c | 16 +++++++++++++++- include/linux/rcutiny.h | 2 ++ include/linux/rcutree.h | 1 + kernel/rcu/tree.c | 8 ++++++++ 4 files changed, 26 insertions(+), 1 deletion(-)