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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 372ADC77B7A for ; Thu, 25 May 2023 17:02:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231599AbjEYRB6 (ORCPT ); Thu, 25 May 2023 13:01:58 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54906 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229458AbjEYRB5 (ORCPT ); Thu, 25 May 2023 13:01:57 -0400 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 32674195 for ; Thu, 25 May 2023 10:01:09 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1685034068; 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: in-reply-to:in-reply-to:references:references; bh=2kW+rTE3/dBrTBKwDunnX8pfK/lEaBYR555nV9R9qVo=; b=L6hdnO14mpnYaMMwkE/FL/ZmIkVvSKEX/3k7mOmaOIUa+ZprM1DLn43ozvJZ9vIlFd5m5l sr8VZH2kjc9RCPj4Q4/mhcHlqnoCdwNIf1gBN3RrPGcrsgSmj+ETSvT4m8GnpqSc0qtnZx t1kZxFxuj1uccZPxLltQekNukDw9+dE= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-624--3mXKAo5NJujWbM9vOOlyQ-1; Thu, 25 May 2023 13:01:04 -0400 X-MC-Unique: -3mXKAo5NJujWbM9vOOlyQ-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id C1E26801224; Thu, 25 May 2023 17:01:02 +0000 (UTC) Received: from warthog.procyon.org.uk (unknown [10.39.192.68]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4BE582166B2E; Thu, 25 May 2023 17:01:00 +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: References: <20230522205744.2825689-1-dhowells@redhat.com> <3068545.1684872971@warthog.procyon.org.uk> <3215177.1684918030@warthog.procyon.org.uk> To: Linus Torvalds Cc: dhowells@redhat.com, Christoph Hellwig , Jens Axboe , Al Viro , Matthew Wilcox , Jan Kara , Jeff Layton , David Hildenbrand , Jason Gunthorpe , Logan Gunthorpe , Hillf Danton , Christian Brauner , linux-fsdevel@vger.kernel.org, linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: Extending page pinning into fs/direct-io.c MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <88982.1685034059.1@warthog.procyon.org.uk> Date: Thu, 25 May 2023 18:00:59 +0100 Message-ID: <88983.1685034059@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 Precedence: bulk List-ID: X-Mailing-List: linux-block@vger.kernel.org Linus Torvalds wrote: > We do have cases that try to use the page coloring that we support. What do we gain from it? Presumably since nothing is supposed to write to that page, it can be shared in all the caches. David