Received: by 2002:ac0:a581:0:0:0:0:0 with SMTP id m1-v6csp2253254imm; Sat, 23 Jun 2018 13:15:14 -0700 (PDT) X-Google-Smtp-Source: ADUXVKJCfU1/RM9YyFzy5KuGQeSly7p/JL5ZZ+Suax8MCmccV8r+Rtpat+8lXRTYO9bLskKMBToo X-Received: by 2002:a17:902:ba97:: with SMTP id k23-v6mr6582269pls.259.1529784914417; Sat, 23 Jun 2018 13:15:14 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1529784914; cv=none; d=google.com; s=arc-20160816; b=rmcByn7sWkzyb/AEXOXjfNGWlNOP9K7TXJ2nJ9Dt3iSsQR2uZCxQQshnRfMVDPOhd0 kpEZ5ZFSS89gQiIkj4oFd3kAs8MfcO37G9IVRp5d7yRQhDRv2hqvBD9qXcmLcEYS06g8 xxAmiROXwzCkjGLTAsTV8IjKvZ1z9lJR0KUsHL9ezEMJWCOC8sSxm3+ucmQyGJDDNpI6 T2paglwE6D/NC5Rn/6LV2GvCDrXrEiBlGebjjZRyjTR5HVuwY2XaH7+QoZ/SFRAvNP7d DUTwGyKTqCjBpmV0Z3m4rI6ikmrvFYo2pcFu4F3RC1IxQGnhROzgD0j0yc1QgiJMu7sC otGQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:mime-version:user-agent:references :message-id:in-reply-to:subject:cc:to:from:date :arc-authentication-results; bh=Db5c4xSKLdI9wCzf8Z2tPAlu8Za1LQsjXCR0k/qiZOw=; b=jfPr5rQj+F/qz50oljG11/+9q9YAgvYBeuxbGLwpV164kcg/ni7t3VId/hJ6DLTZF1 e0Cdr+GRRWX+bYeV16M8GBKl9srWVTTmN9SxeG3tpZI0n7xcQR9pXYXYhQe+nh310xQw WBGno9cMP6USI81AliuYp3taWQ2h8RL4t0MQOUuzhP1BkL47J+HSi7hHDHHyrCV6ont5 4VmlHUHcL/dz6WsmBzExKc7bmMzHbn6jNO0hrwVFnNIPWF1SWVsiSJGn1M84w2L2TSf4 /xQiTEq7fy0ErYTwAtlFehWRtrLEd0QGeN4MJ7hl9GpQgpVepLJZGlVCKoBopxJrnWRV opMg== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id d2-v6si8121210pgv.562.2018.06.23.13.14.30; Sat, 23 Jun 2018 13:15:14 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751889AbeFWUNA (ORCPT + 99 others); Sat, 23 Jun 2018 16:13:00 -0400 Received: from Galois.linutronix.de ([146.0.238.70]:43902 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751791AbeFWUM7 (ORCPT ); Sat, 23 Jun 2018 16:12:59 -0400 Received: from p4fea482e.dip0.t-ipconnect.de ([79.234.72.46] helo=nanos) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1fWosj-0007yF-3g; Sat, 23 Jun 2018 22:11:37 +0200 Date: Sat, 23 Jun 2018 22:11:36 +0200 (CEST) From: Thomas Gleixner To: Pavel Tatashin cc: steven.sistare@oracle.com, daniel.m.jordan@oracle.com, linux@armlinux.org.uk, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com, john.stultz@linaro.org, sboyd@codeaurora.org, x86@kernel.org, linux-kernel@vger.kernel.org, mingo@redhat.com, hpa@zytor.com, douly.fnst@cn.fujitsu.com, peterz@infradead.org, prarit@redhat.com, feng.tang@intel.com, pmladek@suse.com, gnomes@lxorguk.ukuu.org.uk, linux-s390@vger.kernel.org Subject: Re: [PATCH v12 09/11] x86/tsc: prepare for early sched_clock In-Reply-To: Message-ID: References: <20180621212518.19914-1-pasha.tatashin@oracle.com> <20180621212518.19914-10-pasha.tatashin@oracle.com> User-Agent: Alpine 2.21 (DEB 202 2017-01-01) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sat, 23 Jun 2018, Thomas Gleixner wrote: > On Thu, 21 Jun 2018, Pavel Tatashin wrote: > > We will change sched_clock() to be called early. > > Why is this relevant? Does the issue only appear with that change? So you forgot to answer this question. I did not find a system yet, which actually exposes this behaviour on mainline. Is this an artifact of your early sched clock thing? Thanks, tglx