From patchwork Sun Jul 14 05:34:53 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marcos Paulo de Souza X-Patchwork-Id: 11043163 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 708A5912 for ; Sun, 14 Jul 2019 05:34:37 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5E04227F97 for ; Sun, 14 Jul 2019 05:34:37 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4F83828306; Sun, 14 Jul 2019 05:34:37 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-8.0 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FROM,MAILING_LIST_MULTI,RCVD_IN_DNSWL_HI autolearn=ham version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id EB1FF27F97 for ; Sun, 14 Jul 2019 05:34:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728220AbfGNFe2 (ORCPT ); Sun, 14 Jul 2019 01:34:28 -0400 Received: from mail-qt1-f194.google.com ([209.85.160.194]:47040 "EHLO mail-qt1-f194.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728211AbfGNFe2 (ORCPT ); Sun, 14 Jul 2019 01:34:28 -0400 Received: by mail-qt1-f194.google.com with SMTP id h21so12380472qtn.13; Sat, 13 Jul 2019 22:34:27 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=3NuZBQYq6h4qssOwOc1GYw/bYwn0rg1ObW5YhftgdKo=; b=Rc6j38WHmlwoJ6+nn1UzHs0z5kKcHeRTnkdMI1haEQYRiv68Jaxdt46vXIi+zBbbcr SYAEWbGQQl4dHOdLj24edmB3gGykzrP1FMdZ9299TSoAufgb0mPy8x6aeCA2FO2IF8br VLoJRc4GDq9T3sngTJ78jRNc7oMihS80+wnoHOJaNgg6Kdga/8GjEXgVBOstmnClq2OW kcvi4xJiHhqb54UyagO2/g2/gx5wmNEZboIE31uf2ZQ5FXhXbOSyqba0PW5CXZvzSP/+ YJCbOvBE7R0ZBkC6MkThlyTYq7p+h1RLL7HPaf2WSSmWqitkGhxcSF6PtIRC/qyGr03r i7Cw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=3NuZBQYq6h4qssOwOc1GYw/bYwn0rg1ObW5YhftgdKo=; b=clzJOehgLlNbJgxhmLIhQzIkN0zBYulLs1no/28W7R4GBYPeHI3ZdWlSiNvWLCtA9R 8SgI/AZ3k3hkgEXOmnGpmkOTkr2+mQbxPbUwPIN/FC4bh0ebYZtOXvzbiC6KzcS9RIfd V/HqwiikeS9QCNvpi4t2ke5mOMOcHiMBVjxezf3bfjHnwje4dHh3YUHrXSxs2Z/obKFc HNX4WOHKDEa6LkQZzzQC+Njkb7Jx/osO3jlQBahev3ZM9Z54NA4KvjwvZtoBrwib3tMx hHwRY1j938FbOfxYBzVLCy8AWt9H6oAkw9HI3HReruCDgby2AFC28FlXbEqYOSO4nsWz 3H9w== X-Gm-Message-State: APjAAAU277LcOxufdM4WkDgQEs1++/sqLgd/E9VHyYOJqycQCdauSO7G H0FCRsFDl0b5gIv6raBpEx/UqYn7eKE= X-Google-Smtp-Source: APXvYqzbKUt2+dUfTolXSJIoItXsrnwI/cMSGQLlpamlQPHK1Ih2v6SivMNd42MzAWpnIntXozHS3g== X-Received: by 2002:ac8:180e:: with SMTP id q14mr12664651qtj.327.1563082466762; Sat, 13 Jul 2019 22:34:26 -0700 (PDT) Received: from localhost.localdomain ([191.35.237.35]) by smtp.gmail.com with ESMTPSA id f133sm6308808qke.62.2019.07.13.22.34.24 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Sat, 13 Jul 2019 22:34:26 -0700 (PDT) From: Marcos Paulo de Souza To: linux-kernel@vger.kernel.org Cc: linux-block@vger.kernel.org, linux-doc@vger.kernel.org, Marcos Paulo de Souza , Jonathan Corbet Subject: [PATCH 4/4] Documentation:kernel-per-CPU-kthreads.txt: Remove reference to elevator= Date: Sun, 14 Jul 2019 02:34:53 -0300 Message-Id: <20190714053453.1655-5-marcos.souza.org@gmail.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190714053453.1655-1-marcos.souza.org@gmail.com> References: <20190714053453.1655-1-marcos.souza.org@gmail.com> MIME-Version: 1.0 Sender: linux-block-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP This argument was not being considered since blk-mq was set by default, so removed this documentation to avoid confusion. Signed-off-by: Marcos Paulo de Souza Reviewed-by: Hannes Reinecke --- Documentation/kernel-per-CPU-kthreads.txt | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/Documentation/kernel-per-CPU-kthreads.txt b/Documentation/kernel-per-CPU-kthreads.txt index 5623b9916411..c68c6c8c26a4 100644 --- a/Documentation/kernel-per-CPU-kthreads.txt +++ b/Documentation/kernel-per-CPU-kthreads.txt @@ -274,9 +274,7 @@ To reduce its OS jitter, do any of the following: (based on an earlier one from Gilad Ben-Yossef) that reduces or even eliminates vmstat overhead for some workloads at https://lkml.org/lkml/2013/9/4/379. - e. Boot with "elevator=noop" to avoid workqueue use by - the block layer. - f. If running on high-end powerpc servers, build with + e. If running on high-end powerpc servers, build with CONFIG_PPC_RTAS_DAEMON=n. This prevents the RTAS daemon from running on each CPU every second or so. (This will require editing Kconfig files and will defeat @@ -284,12 +282,12 @@ To reduce its OS jitter, do any of the following: due to the rtas_event_scan() function. WARNING: Please check your CPU specifications to make sure that this is safe on your particular system. - g. If running on Cell Processor, build your kernel with + f. If running on Cell Processor, build your kernel with CBE_CPUFREQ_SPU_GOVERNOR=n to avoid OS jitter from spu_gov_work(). WARNING: Please check your CPU specifications to make sure that this is safe on your particular system. - h. If running on PowerMAC, build your kernel with + g. If running on PowerMAC, build your kernel with CONFIG_PMAC_RACKMETER=n to disable the CPU-meter, avoiding OS jitter from rackmeter_do_timer().