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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 9B57AC2D0E2 for ; Thu, 24 Sep 2020 06:34:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5A8212311A for ; Thu, 24 Sep 2020 06:34:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=mg.codeaurora.org header.i=@mg.codeaurora.org header.b="ko3l9p3R" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726950AbgIXGee (ORCPT ); Thu, 24 Sep 2020 02:34:34 -0400 Received: from z5.mailgun.us ([104.130.96.5]:59140 "EHLO z5.mailgun.us" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726906AbgIXGee (ORCPT ); Thu, 24 Sep 2020 02:34:34 -0400 DKIM-Signature: a=rsa-sha256; v=1; c=relaxed/relaxed; d=mg.codeaurora.org; q=dns/txt; s=smtp; t=1600929273; h=Message-Id: Date: Subject: Cc: To: From: Sender; bh=SCZE0l76mOT8sBQ7aJKBqrLFMUKoKWKDRKCvf8+bXBk=; b=ko3l9p3RWzNcMReY/GjOM8r/ZcG/+Q6hXz8KB1+jAoSFFHIB4OTqZcqahmXkcJON1DGbf6No mRVyGUtwjqtuD29RJxPawOOMfTWwBfucRAf8roaLhRzEybGKWJ/IA+Tlwc/SwDemGMUnFCOl 3cXH8dyLoa+kMU63075DYPCBz9o= X-Mailgun-Sending-Ip: 104.130.96.5 X-Mailgun-Sid: WyI0MWYwYSIsICJsaW51eC1rZXJuZWxAdmdlci5rZXJuZWwub3JnIiwgImJlOWU0YSJd Received: from smtp.codeaurora.org (ec2-35-166-182-171.us-west-2.compute.amazonaws.com [35.166.182.171]) by smtp-out-n03.prod.us-east-1.postgun.com with SMTP id 5f6c3dea244d44dc65074235 (version=TLS1.2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256); Thu, 24 Sep 2020 06:34:18 GMT Sender: neeraju=codeaurora.org@mg.codeaurora.org Received: by smtp.codeaurora.org (Postfix, from userid 1001) id BE6F6C43385; Thu, 24 Sep 2020 06:34:17 +0000 (UTC) Received: from localhost (unknown [202.46.22.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: neeraju) by smtp.codeaurora.org (Postfix) with ESMTPSA id B2FA2C433C8; Thu, 24 Sep 2020 06:34:15 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org B2FA2C433C8 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=fail smtp.mailfrom=neeraju@codeaurora.org From: Neeraj Upadhyay To: paulmck@kernel.org, josh@joshtriplett.org, rostedt@goodmis.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, joel@joelfernandes.org Cc: rcu@vger.kernel.org, linux-kernel@vger.kernel.org, Neeraj Upadhyay Subject: [PATCH] rcu: Clarify nocb kthreads naming in RCU_NOCB_CPU config Date: Thu, 24 Sep 2020 12:04:10 +0530 Message-Id: <1600929250-20344-1-git-send-email-neeraju@codeaurora.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Clarify the "x" in rcuox/N naming in RCU_NOCB_CPU config description. Signed-off-by: Neeraj Upadhyay --- kernel/rcu/Kconfig | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/kernel/rcu/Kconfig b/kernel/rcu/Kconfig index b71e21f..5b22747 100644 --- a/kernel/rcu/Kconfig +++ b/kernel/rcu/Kconfig @@ -227,11 +227,12 @@ config RCU_NOCB_CPU specified at boot time by the rcu_nocbs parameter. For each such CPU, a kthread ("rcuox/N") will be created to invoke callbacks, where the "N" is the CPU being offloaded, and where - the "p" for RCU-preempt (PREEMPTION kernels) and "s" for RCU-sched - (!PREEMPTION kernels). Nothing prevents this kthread from running - on the specified CPUs, but (1) the kthreads may be preempted - between each callback, and (2) affinity or cgroups can be used - to force the kthreads to run on whatever set of CPUs is desired. + the "x" is "p" for RCU-preempt (PREEMPTION kernels) and "s" for + RCU-sched (!PREEMPTION kernels). Nothing prevents this kthread + from running on the specified CPUs, but (1) the kthreads may be + preempted between each callback, and (2) affinity or cgroups can + be used to force the kthreads to run on whatever set of CPUs is + desired. Say Y here if you want to help to debug reduced OS jitter. Say N here if you are unsure. -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project