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 C4EEFC433DF for ; Tue, 23 Jun 2020 00:32:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 94A952053B for ; Tue, 23 Jun 2020 00:32:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592872339; bh=gFvVkuGayO5dIBUvKhLS305uE+ytbiCZERTAqgnColQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=AYeWPTvPSZDYJ5MPJ4qaLeROLOT8SEKhhxg19z1eDEsEjN8GP2ZDFxVXYChdWThIC M7kq8HKm4a9mW/vxDNxAoz6kQBXQsYqy/Tin9iKUNTVlWF0+FXuFpHL+vHgccaIELq tPLXGEB128ekHk0+y4yKW7PG8qnk9P3UvIbB8kJc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731983AbgFWAcR (ORCPT ); Mon, 22 Jun 2020 20:32:17 -0400 Received: from mail.kernel.org ([198.145.29.99]:55258 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731643AbgFWAaR (ORCPT ); Mon, 22 Jun 2020 20:30:17 -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 8F7132082F; Tue, 23 Jun 2020 00:30:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1592872216; bh=gFvVkuGayO5dIBUvKhLS305uE+ytbiCZERTAqgnColQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eO9eU8uDPhnYFubzvYvibEh2Y/qMrZby3wzNwkbYi438vSKkEgC1C8P/kc7UnJ2wW 1oXiQFjh/01qorFW0atN3cZhCTmsqEMY49ny9xZmC8vGwM5VTDN3usBapBawdxvXx3 64cSrWDjQpiZA1US1y/rv8uELZVdC0hVFC+x5LzM= 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 07/30] refperf: Allow decimal nanoseconds Date: Mon, 22 Jun 2020 17:29:50 -0700 Message-Id: <20200623003013.26252-7-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" The CONFIG_PREEMPT=n rcu_read_lock()/rcu_read_unlock() pair's overhead, even including loop overhead, is far less than one nanosecond. Since logscale plots are not all that happy with zero values, provide picoseconds as decimals. Cc: Joel Fernandes (Google) Signed-off-by: Paul E. McKenney --- kernel/rcu/refperf.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/rcu/refperf.c b/kernel/rcu/refperf.c index 57c7b7a..e991d48 100644 --- a/kernel/rcu/refperf.c +++ b/kernel/rcu/refperf.c @@ -375,7 +375,7 @@ static int main_func(void *arg) if (torture_must_stop()) goto end; - reader_tasks[exp].result_avg = process_durations(exp) / ((exp + 1) * loops); + reader_tasks[exp].result_avg = 1000 * process_durations(exp) / ((exp + 1) * loops); } // Print the average of all experiments @@ -386,7 +386,7 @@ static int main_func(void *arg) strcat(buf, "Threads\tTime(ns)\n"); for (exp = 0; exp < nreaders; exp++) { - sprintf(buf1, "%d\t%llu\n", exp + 1, reader_tasks[exp].result_avg); + sprintf(buf1, "%d\t%llu.%03d\n", exp + 1, reader_tasks[exp].result_avg / 1000, (int)(reader_tasks[exp].result_avg % 1000)); strcat(buf, buf1); } -- 2.9.5