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 lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id DE761C001DF for ; Tue, 25 Jul 2023 19:31:00 +0000 (UTC) Authentication-Results: lists.ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=linux-foundation.org header.i=@linux-foundation.org header.a=rsa-sha256 header.s=korg header.b=c7KZ8NqR; dkim-atps=neutral Received: from boromir.ozlabs.org (localhost [IPv6:::1]) by lists.ozlabs.org (Postfix) with ESMTP id 4R9Rw31w8nz3cWy for ; Wed, 26 Jul 2023 05:30:59 +1000 (AEST) Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=linux-foundation.org header.i=@linux-foundation.org header.a=rsa-sha256 header.s=korg header.b=c7KZ8NqR; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux-foundation.org (client-ip=2604:1380:4641:c500::1; helo=dfw.source.kernel.org; envelope-from=akpm@linux-foundation.org; receiver=lists.ozlabs.org) Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4R9Rv24pnxz30ht for ; Wed, 26 Jul 2023 05:30:05 +1000 (AEST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 29B20617B9; Tue, 25 Jul 2023 19:30:01 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0E90CC433C8; Tue, 25 Jul 2023 19:30:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linux-foundation.org; s=korg; t=1690313400; bh=OoSjqjANODd3KfCGOV5QoBOToju0dohDhyNGk30onVI=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=c7KZ8NqR9D1lUt5VVPt4OEtIejA2HJp/Z5r1YCj9WDgNDXATlwmQ9uFGel4lE9Sb3 uF8SXTGuepx56KwB5CTOFOC+tvVzR3Nzvth7GsqRYTxXNTqcd7thesPmqlExKgbiv3 wM5l31aYjOPZI0bUoN0VNAXehAn3h+jrmwmAicBM= Date: Tue, 25 Jul 2023 12:29:59 -0700 From: Andrew Morton To: "Aneesh Kumar K.V" Subject: Re: [PATCH v6 00/13] Add support for DAX vmemmap optimization for ppc64 Message-Id: <20230725122959.e9b79e7528cd3084802fa6d0@linux-foundation.org> In-Reply-To: <20230724190759.483013-1-aneesh.kumar@linux.ibm.com> References: <20230724190759.483013-1-aneesh.kumar@linux.ibm.com> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Will Deacon , Muchun Song , linux-mm@kvack.org, npiggin@gmail.com, Catalin Marinas , Dan Williams , Mike Kravetz , linuxppc-dev@lists.ozlabs.org, Joao Martins , Oscar Salvador Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Tue, 25 Jul 2023 00:37:46 +0530 "Aneesh Kumar K.V" wrote: > This patch series implements changes required to support DAX vmemmap > optimization for ppc64. Do we have any measurements to help us understand the magnitude of this optimization? And any documentation which helps users understand whether and why they should enable this feature?