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=-10.3 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_2 autolearn=ham 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 57D0CC433E0 for ; Wed, 24 Mar 2021 01:45:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2DCBD619E8 for ; Wed, 24 Mar 2021 01:45:43 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231516AbhCXBpI (ORCPT ); Tue, 23 Mar 2021 21:45:08 -0400 Received: from mail.kernel.org ([198.145.29.99]:33776 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230334AbhCXBo4 (ORCPT ); Tue, 23 Mar 2021 21:44:56 -0400 Received: from oasis.local.home (cpe-66-24-58-225.stny.res.rr.com [66.24.58.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8D75661924; Wed, 24 Mar 2021 01:44:55 +0000 (UTC) Date: Tue, 23 Mar 2021 21:44:54 -0400 From: Steven Rostedt To: "Tzvetomir Stoyanov (VMware)" Cc: linux-trace-devel@vger.kernel.org Subject: Re: [PATCH v2 13/18] trace-cmd: Set order and priorities when applying timestamp corrections Message-ID: <20210323214454.4a97d305@oasis.local.home> In-Reply-To: <20210322095945.259300-14-tz.stoyanov@gmail.com> References: <20210322095945.259300-1-tz.stoyanov@gmail.com> <20210322095945.259300-14-tz.stoyanov@gmail.com> X-Mailer: Claws Mail 3.17.3 (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-trace-devel@vger.kernel.org On Mon, 22 Mar 2021 11:59:40 +0200 "Tzvetomir Stoyanov (VMware)" wrote: > @@ -1296,17 +1287,26 @@ static unsigned long long timestamp_correct(unsigned long long ts, > static unsigned long long timestamp_calc(unsigned long long ts, > struct tracecmd_input *handle) > { > - unsigned long long t; > + unsigned long long t = ts; OK, now you are just wasting away extra variables!!!! ;-) Just use ts, no need to create a local variable. It's OK to reuse the parameters. gcc will just do it for you anyway. -- Steve > > - t = timestamp_correct(ts, handle); > > - if (handle->ts2secs) > + /* Guest trace file, sync with host timestamps */ > + if (handle->host.sync_enable) > + t = timestamp_host_sync(ts, handle); > + > + if (handle->ts2secs) { > + /* user specified clock frequency */ > t *= handle->ts2secs; > - else if (handle->tsc_calc.mult) { > + } else if (handle->tsc_calc.mult) { > + /* auto calculated TSC clock frequency */ > t -= handle->tsc_calc.offset; > t = mul_u64_u32_shr(t, handle->tsc_calc.mult, handle->tsc_calc.shift); > } > > + /* User specified time offset with --ts-offset or --date options */ > + if (handle->ts_offset) > + t += handle->ts_offset; > + > return t; > } >