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 C8831C43217 for ; Sun, 3 Apr 2022 05:13:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235645AbiDCFP3 (ORCPT ); Sun, 3 Apr 2022 01:15:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53042 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229566AbiDCFP3 (ORCPT ); Sun, 3 Apr 2022 01:15:29 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7633419289; Sat, 2 Apr 2022 22:13:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:Content-Type: In-Reply-To:From:References:Cc:To:Subject:MIME-Version:Date:Message-ID:Sender :Reply-To:Content-ID:Content-Description; bh=PEgc8Ga0cnyRYRy3sepXDsniqZif9JIr9jjDkoUEBdQ=; b=arcia5dACXcwl6PBm4kdLKQ00e o+b4po6tKbqKMZVRftRs0MOz/ARBR1SL4zRpNCD088wyaw+l/rX4n8jLRgiv+JD5oX5Jp2DVRCVtM TEpqzQHaa93aHawO0Ees1yGVSLxDdD/+P/isouLSUUjwEjSPtVzDSBZNImmvM9XKRBRLWhziBXNr5 mP98OBnzolebyVuK2ufK30MfdrfD8oSeVDJRvV2q09RFzGveyNPj/XeszSH8AyXfNUgDm9VmOqO1L /WcMrQk0UamQ52KlJnfk8mJt52OK8dtFYjxSXMVgqC1T0gyqF4+h20AbE6NaGk4uQaUx+54DaPUed vK3iw9mA==; Received: from [2601:1c0:6280:3f0::aa0b] by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nasYK-004fIF-Ft; Sun, 03 Apr 2022 05:13:28 +0000 Message-ID: <53133d81-e52c-8887-c879-615b585e3351@infradead.org> Date: Sat, 2 Apr 2022 22:13:20 -0700 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Thunderbird/91.7.0 Subject: Re: [PATCH 1/3 v2] Docs: admin/kernel-parameters: edit a few boot options Content-Language: en-US To: Steven Rostedt 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 References: <20220401030927.12023-1-rdunlap@infradead.org> <20220401030927.12023-2-rdunlap@infradead.org> <20220401120305.00076d14@gandalf.local.home> From: Randy Dunlap In-Reply-To: <20220401120305.00076d14@gandalf.local.home> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-s390@vger.kernel.org On 4/1/22 09:03, Steven Rostedt wrote: > 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. > Will do. Thanks. > > >> + >> trace_event=[event-list] >> [FTRACE] Set and start specified trace events in order >> to facilitate early boot debugging. The event-list is a -- ~Randy