Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 00984C05027 for ; Mon, 23 Jan 2023 13:20:53 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231601AbjAWNUw (ORCPT ); Mon, 23 Jan 2023 08:20:52 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:45020 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230128AbjAWNUs (ORCPT ); Mon, 23 Jan 2023 08:20:48 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2CA1D1B57C for ; Mon, 23 Jan 2023 05:19:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1674479998; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=2dXPaoH2gVDFVTSGvvio+eGDLGhUPptB34DHJn1Fsns=; b=P6KMr9Nv/Oq7Zt4wi4hleOpcjQ9NHRJLOd8sxbPsMwvKBUzOvtLr6+oCTogx7PjXeLOcPm q4sUGshxloGsNRno5rCc3/zbliAnL4UGul2IVVr7eG+ytlMBGCGXi27DzyPtR4kxn3wEq4 cF5eIKcqfKCTv7w5Od0NZJDE0Cxk+Yk= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-128-MArzK175NrugE9CKytvGCg-1; Mon, 23 Jan 2023 08:19:55 -0500 X-MC-Unique: MArzK175NrugE9CKytvGCg-1 Received: from smtp.corp.redhat.com (int-mx05.intmail.prod.int.rdu2.redhat.com [10.11.54.5]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id B59F31C29D41; Mon, 23 Jan 2023 13:19:54 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.33.36.23]) by smtp.corp.redhat.com (Postfix) with ESMTP id EA1E9175A2; Mon, 23 Jan 2023 13:19:52 +0000 (UTC) Organization: Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 From: David Howells In-Reply-To: <7bbcccc9-6ebf-ffab-7425-2a12f217ba15@redhat.com> References: <7bbcccc9-6ebf-ffab-7425-2a12f217ba15@redhat.com> <246ba813-698b-8696-7f4d-400034a3380b@redhat.com> <20230120175556.3556978-1-dhowells@redhat.com> <20230120175556.3556978-3-dhowells@redhat.com> <3814749.1674474663@warthog.procyon.org.uk> To: David Hildenbrand Cc: dhowells@redhat.com, Al Viro , Christoph Hellwig , Matthew Wilcox , Jens Axboe , Jan Kara , Jeff Layton , Logan Gunthorpe , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, Christoph Hellwig , John Hubbard , linux-mm@kvack.org Subject: Re: [PATCH v7 2/8] iov_iter: Add a function to extract a page list from an iterator MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <3903249.1674479992.1@warthog.procyon.org.uk> Content-Transfer-Encoding: quoted-printable Date: Mon, 23 Jan 2023 13:19:52 +0000 Message-ID: <3903251.1674479992@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.1 on 10.11.54.5 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org David Hildenbrand wrote: > Switching from FOLL_GET to FOLL_PIN was in the works by John H. Not sure= what > the status is. Interestingly, Documentation/core-api/pin_user_pages.rst > already documents that "CASE 1: Direct IO (DIO)" uses FOLL_PIN ... which= does, > unfortunately, no reflect reality yet. Yeah - I just came across that. Should iov_iter.c then switch entirely to using pin_user_pages(), rather t= han get_user_pages()? In which case my patches only need keep track of pinned/not-pinned and never "got". David