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=-3.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS 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 AA77BC433E6 for ; Thu, 25 Feb 2021 12:17:06 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 1BF4D64F0C for ; Thu, 25 Feb 2021 12:17:06 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 1BF4D64F0C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 809478D001C; Thu, 25 Feb 2021 07:17:05 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 7B9638D0005; Thu, 25 Feb 2021 07:17:05 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6CE778D001C; Thu, 25 Feb 2021 07:17:05 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0028.hostedemail.com [216.40.44.28]) by kanga.kvack.org (Postfix) with ESMTP id 5A92F8D0005 for ; Thu, 25 Feb 2021 07:17:05 -0500 (EST) Received: from smtpin15.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 29B81180DC465 for ; Thu, 25 Feb 2021 12:17:05 +0000 (UTC) X-FDA: 77856689610.15.C933850 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf11.hostedemail.com (Postfix) with ESMTP id D626D20001F2 for ; Thu, 25 Feb 2021 12:16:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.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; bh=Dhg25HBLQmpPTUrBeAi4KzvGulGLk3wK8liuB/pkJUM=; b=svnVtvU9dhrIjMrSXZc60bSONi 0bmr2LlUpHb2v7UTLnwvCv3IzRoPEb7wJoZluzAoVwjjmN9ZKwU6GMm0x2KM0zM8t9Srpvk59teXk cJ+6hHxQZUs7JeVJuzafAYVCqkdf9yXucTTsmkrceBZirJLPphZgaNjUPMDKbNACOgROU8jZjH4AV t76PLK1KaRZxdoJAujnXSnx1sdeqgJJ6eUDEEXVfa80MLGZzOa7Kqr/xeg6o71yDSI82GmqSziVRP SVOETPEGcEgqj3xUprT5skABezTo6dFcHaOBiF2L26fHS7CIwEbeFQrB1s1gUtY/FjMjeXwlf7fzW n4eRfATw==; Received: from willy by casper.infradead.org with local (Exim 4.94 #2 (Red Hat Linux)) id 1lFFZV-00AgNl-8k; Thu, 25 Feb 2021 12:16:47 +0000 Date: Thu, 25 Feb 2021 12:16:45 +0000 From: Matthew Wilcox To: Nadav Amit Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Hugh Dickins , Andy Lutomirski , Thomas Gleixner , Peter Zijlstra , Ingo Molnar , Borislav Petkov , Nadav Amit , Sean Christopherson , Andrew Morton , x86@kernel.org Subject: Re: [RFC 0/6] x86: prefetch_page() vDSO call Message-ID: <20210225121645.GZ2858050@casper.infradead.org> References: <20210225072910.2811795-1-namit@vmware.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210225072910.2811795-1-namit@vmware.com> X-Rspamd-Server: rspam03 X-Rspamd-Queue-Id: D626D20001F2 X-Stat-Signature: fgzwsnjg8k9k75xuqxguhud8yajsbqnf Received-SPF: none (infradead.org>: No applicable sender policy available) receiver=imf11; identity=mailfrom; envelope-from=""; helo=casper.infradead.org; client-ip=90.155.50.34 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1614255414-344673 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Wed, Feb 24, 2021 at 11:29:04PM -0800, Nadav Amit wrote: > Just as applications can use prefetch instructions to overlap > computations and memory accesses, applications may want to overlap the > page-faults and compute or overlap the I/O accesses that are required > for page-faults of different pages. Isn't this madvise(MADV_WILLNEED)?