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=-1.1 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,T_DKIMWL_WL_HIGH 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 CD6A7C282CE for ; Tue, 4 Jun 2019 17:39:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9D43C208E3 for ; Tue, 4 Jun 2019 17:39:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559669962; bh=aYguEb5aG56wiHY6OzZHyRUFhv/lZp83hT9+l3dp638=; h=References:In-Reply-To:From:Date:Subject:To:Cc:List-ID:From; b=n+qVvhtT9RsdMBbWLpspZA1V8/syekxtR9wzJky88TJT73rQqlqbypTVKPUhxEfJJ ilk+HJYiF+yEvjpPDn3tpiNBz31IuMvmjE4cxTjNq0fPEH2CVUXeS5OIqb/COSoP69 UNzT5dXo/2CQdeASRpfyb9vOsF4dYrCuTK2SQNTw= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726742AbfFDRjV (ORCPT ); Tue, 4 Jun 2019 13:39:21 -0400 Received: from mail.kernel.org ([198.145.29.99]:51528 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726336AbfFDRjV (ORCPT ); Tue, 4 Jun 2019 13:39:21 -0400 Received: from mail-wr1-f45.google.com (mail-wr1-f45.google.com [209.85.221.45]) (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 E0C8A208E3 for ; Tue, 4 Jun 2019 17:39:20 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1559669961; bh=aYguEb5aG56wiHY6OzZHyRUFhv/lZp83hT9+l3dp638=; h=References:In-Reply-To:From:Date:Subject:To:Cc:From; b=ZHE4Dw92A2LpBnMgIII9AZNaZa0i8z36M5lXAuE5NjwKWoKY499Fye+2L7IRYvfao 1ryehXVFellQIyP3ZK99HSFuDxyNoinIoPFE0Zrp9re15I7MndIRkJsSP/53BSB8Fd i848f1zEzfPvjysD/yvjOLFsBboYheKUuCFc3aVs= Received: by mail-wr1-f45.google.com with SMTP id d18so16734806wrs.5 for ; Tue, 04 Jun 2019 10:39:20 -0700 (PDT) X-Gm-Message-State: APjAAAVmeHO9QnLrXA1y1G1mSLhQC6aK891FxF+hDf/YMxFupG70gEsu iOH91AyVTURMOh8IULmdDDwzjky1MXczcuJ18TnpBw== X-Google-Smtp-Source: APXvYqyg01tQSt5O2lN3mZLnwAel5frzOX/OUAFM4IOFuds5sxzUjj3rfd8O0VqT4+oCtFsLsiL6CXnRgwGmhtxIqiU= X-Received: by 2002:adf:fe90:: with SMTP id l16mr555546wrr.221.1559669959488; Tue, 04 Jun 2019 10:39:19 -0700 (PDT) MIME-Version: 1.0 References: <20190604164117.22154-1-alexander.sverdlin@nokia.com> In-Reply-To: <20190604164117.22154-1-alexander.sverdlin@nokia.com> From: Andy Lutomirski Date: Tue, 4 Jun 2019 10:39:06 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: [PATCH v2] x86/vdso: implement clock_gettime(CLOCK_MONOTONIC_RAW, ...) To: "Sverdlin, Alexander (Nokia - DE/Ulm)" Cc: "x86@kernel.org" , "linux-kernel@vger.kernel.org" , Andy Lutomirski , Ingo Molnar , Borislav Petkov , "H. Peter Anvin" , Thomas Gleixner , Jason Vas Dias Content-Type: text/plain; charset="UTF-8" Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, Jun 4, 2019 at 9:42 AM Sverdlin, Alexander (Nokia - DE/Ulm) wrote: > > From: Alexander Sverdlin > > Add CLOCK_MONOTONIC_RAW to the existing clock_gettime() vDSO > implementation. This is based on the ideas of Jason Vas Dias and comments > of Thomas Gleixner. > Can you benchmark this against pulling the mult and shift into the per-clock base? --Andy