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=-2.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no 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 DECABFC6195 for ; Thu, 7 Nov 2019 12:49:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9F88D2178F for ; Thu, 7 Nov 2019 12:49:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="ZRxpJygO" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2388892AbfKGMt1 (ORCPT ); Thu, 7 Nov 2019 07:49:27 -0500 Received: from merlin.infradead.org ([205.233.59.134]:60304 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2388206AbfKGMt0 (ORCPT ); Thu, 7 Nov 2019 07:49:26 -0500 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=T7F/zvXOPKa8aCq1Vyccb+zoCxdKW+wgomzNxicYjaE=; b=ZRxpJygO2nsfDcOvrFfTh0CmU LUy2RIDG5WTJeGDThu3ZxPwRbJh51yRbivvb+X7+of+KZgr/jJM+4w7hTYlLA/dd8YYJbdvL77WLU mAJ5rPnCPO6V8mhGurYFzdey8wmpfBpvVLX+9EFHHQpM1VaG714/gKkZiECKcUijLbBkGkxIwdItP bFRM7GLqa7KU19rTUaXz6TJ9SufNTvlC3O/sTFAKSc6v80cxcuAzZbcpjVYYAZGo5ZsQ6tJ2JWUP8 nJZcnxKsyCXpIMBsReBG+HAtmFzGcq8ZZAzmGFKXdqeevLcWksaQyS5K/YP8JhLXs3AQ/WRMu+F6e UIz3K0sMQ==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1iShE0-0005po-6Z; Thu, 07 Nov 2019 12:49:20 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 70269300489; Thu, 7 Nov 2019 13:48:14 +0100 (CET) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id F12422025EDA7; Thu, 7 Nov 2019 13:49:18 +0100 (CET) Date: Thu, 7 Nov 2019 13:49:18 +0100 From: Peter Zijlstra To: Thomas Gleixner Cc: Jan Stancek , LKML , ltp@lists.linux.it, Al Viro , Greg KH , Ingo Molnar Subject: Re: [PATCH] kernel: use ktime_get_real_ts64() to calculate acct.ac_btime Message-ID: <20191107124918.GH4131@hirez.programming.kicks-ass.net> References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Nov 07, 2019 at 09:56:12AM +0100, Thomas Gleixner wrote: > But it would be way simpler just to store the CLOCK_REALTIME start time > along with BOOT and MONOTONIC and just get rid of all these horrible > calculations which are bound to be wrong. > > Peter? So I'd really hate to do that, as that gives the impression REALTIME is a sane clock to use. As I argued in that other email, REALTIME is horrible crap.