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,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 907C4C433E0 for ; Tue, 23 Jun 2020 00:30:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 65241208A7 for ; Tue, 23 Jun 2020 00:30:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592872240; bh=1veGT3UQhfKYOYux03q+oos70fj1Q5bSyqp9pTfmx8M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=xo50jZR2fnZ0BwrtxFNlZra+W7jnQBY2ljW7aj8c5STx31pVyhhijYmse1nrA2UIY N9YoWpKSUwrm1eUVzDUkGyfZPEYYVwcgzJbtrhXI6y9nQTL1w1Y+xTFhoz+0GNHC4s uHFNOqQaGkOVCKoFr5EsL9ueaIDlIA5Zbv20okuM= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731797AbgFWAae (ORCPT ); Mon, 22 Jun 2020 20:30:34 -0400 Received: from mail.kernel.org ([198.145.29.99]:55402 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731700AbgFWAaU (ORCPT ); Mon, 22 Jun 2020 20:30:20 -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 A4C03208E4; Tue, 23 Jun 2020 00:30:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592872219; bh=1veGT3UQhfKYOYux03q+oos70fj1Q5bSyqp9pTfmx8M=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=smdLsBMM4wYdtb1RNQqD2UdLdew6AuyAhJzFsw40C0S5QjlxVJ1bFyg6fzIwkT/GU nmrN8PHhH1hFDKiM1uboqrqgJnxglNcfJ52uO915Di56VURpdNeUgyVRD2zFNKsYof ii0QBguO2Xt4pbkoG8n7aTbgtafYQAF+zhuj3dAE= 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 22/30] doc: Document rcuperf's module parameters Date: Mon, 22 Jun 2020 17:30:05 -0700 Message-Id: <20200623003013.26252-22-paulmck@kernel.org> X-Mailer: git-send-email 2.9.5 In-Reply-To: <20200623002941.GA26089@paulmck-ThinkPad-P72> References: <20200623002941.GA26089@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" This commit adds documentation for the rcuperf module parameters. Cc: Joel Fernandes (Google) Signed-off-by: Paul E. McKenney --- Documentation/admin-guide/kernel-parameters.txt | 36 +++++++++++++++++++++++++ 1 file changed, 36 insertions(+) diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index fb95fad..20cd00b 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -4407,6 +4407,42 @@ reboot_cpu is s[mp]#### with #### being the processor to be used for rebooting. + refperf.holdoff= [KNL] + Set test-start holdoff period. The purpose of + this parameter is to delay the start of the + test until boot completes in order to avoid + interference. + + refperf.loops= [KNL] + Set the number of loops over the synchronization + primitive under test. Increasing this number + reduces noise due to loop start/end overhead, + but the default has already reduced the per-pass + noise to a handful of picoseconds on ca. 2020 + x86 laptops. + + refperf.nreaders= [KNL] + Set number of readers. The default value of -1 + selects N, where N is roughly 75% of the number + of CPUs. A value of zero is an interesting choice. + + refperf.nruns= [KNL] + Set number of runs, each of which is dumped onto + the console log. + + refperf.readdelay= [KNL] + Set the read-side critical-section duration, + measured in microseconds. + + refperf.shutdown= [KNL] + Shut down the system at the end of the performance + test. This defaults to 1 (shut it down) when + rcuperf is built into the kernel and to 0 (leave + it running) when rcuperf is built as a module. + + refperf.verbose= [KNL] + Enable additional printk() statements. + relax_domain_level= [KNL, SMP] Set scheduler's default relax_domain_level. See Documentation/admin-guide/cgroup-v1/cpusets.rst. -- 2.9.5