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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id CCE11C4332F for ; Fri, 1 Apr 2022 16:28:46 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1343770AbiDAQa3 (ORCPT ); Fri, 1 Apr 2022 12:30:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60592 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1344678AbiDAQaA (ORCPT ); Fri, 1 Apr 2022 12:30:00 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E6C32182AF9; Fri, 1 Apr 2022 09:03:10 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 766F761AF8; Fri, 1 Apr 2022 16:03:10 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 83596C2BBE4; Fri, 1 Apr 2022 16:03:07 +0000 (UTC) Date: Fri, 1 Apr 2022 12:03:05 -0400 From: Steven Rostedt To: Randy Dunlap Cc: linux-kernel@vger.kernel.org, Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , linux-s390@vger.kernel.org, Ingo Molnar , "David S. Miller" , sparclinux@vger.kernel.org, Michael Ellerman , linux-ia64@vger.kernel.org, "Rafael J. Wysocki" , Pavel Machek , Len Brown , linux-pm@vger.kernel.org, linux-acpi@vger.kernel.org, Johannes Weiner , Andrew Morton , Jonathan Corbet , linux-doc@vger.kernel.org Subject: Re: [PATCH 1/3 v2] Docs: admin/kernel-parameters: edit a few boot options Message-ID: <20220401120305.00076d14@gandalf.local.home> In-Reply-To: <20220401030927.12023-2-rdunlap@infradead.org> References: <20220401030927.12023-1-rdunlap@infradead.org> <20220401030927.12023-2-rdunlap@infradead.org> X-Mailer: Claws Mail 3.17.8 (GTK+ 2.24.33; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-s390@vger.kernel.org On Thu, 31 Mar 2022 20:09:25 -0700 Randy Dunlap wrote: > @@ -5908,6 +5910,8 @@ > trace_buf_size=nn[KMG] > [FTRACE] will set tracing buffer size on each cpu. > > + trace_clock= [FTRACE] See Documentation/trace/ftrace.rst trace_clock= [FTRACE] Set the clock used for tracing events at boot up. local - Use the per CPU time stamp counter (converted into nanoseconds). Fast, but depending on the architecture, may not be in sync between CPUs. global - Event time stamps are synchronize across CPUs. May be slower than the local clock, but better for some race conditions. counter - Simple counting of events (1, 2, ..) note, some counts may be skipped due to the infrastructure grabbing the clock more than once per event. uptime - Use jiffies as the time stamp. perf - Use the same clock that perf uses. mono - Use ktime_get_mono_fast_ns() for time stamps. mono_raw - Use ktime_get_raw_fast_ns() for time stamps. boot - Use ktime_get_boot_fast_ns() for time stamps. Architectures may add more clocks. See Documentation/trace/ftrace.rst for more details. -- Steve > + > trace_event=[event-list] > [FTRACE] Set and start specified trace events in order > to facilitate early boot debugging. The event-list is a