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=-8.6 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 3227AC433E7 for ; Thu, 8 Oct 2020 20:27:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C8963221FD for ; Thu, 8 Oct 2020 20:27:39 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="CTzcYsDL" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730344AbgJHU1i (ORCPT ); Thu, 8 Oct 2020 16:27:38 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55816 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729280AbgJHU1i (ORCPT ); Thu, 8 Oct 2020 16:27:38 -0400 Received: from merlin.infradead.org (merlin.infradead.org [IPv6:2001:8b0:10b:1231::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4E5B5C0613D2; Thu, 8 Oct 2020 13:27:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=merlin.20170209; h=Content-Transfer-Encoding:Content-Type: In-Reply-To:MIME-Version:Date:Message-ID:From:References:Cc:To:Subject:Sender :Reply-To:Content-ID:Content-Description; bh=7jif2k9zcZ8cHV0IvpYw8TET4vLh557VQNExhD1A4Wo=; b=CTzcYsDLt2qZcuaRE50e5/Tk0x RORejz9K7yDXQyTYhwvrg2JWgAcrr9LYrXw6bsr6DS4rkl0ey7kkju4NqD5Q0Mjvk4GAElSkaMq7f RkpyWSqvrV8IWfmiFG80+lSVgrT4+QcRoXKwfaGxRAVRY3/kQEHr0O9sxUNOpfIUEz8l32dqleWeN hwKhOPdKI0D21AuXgGOsCDP7GsBGteclbShiuMLFKxMSpfIGquwuZKwG8hMVrJxmVAZzuzBM4T0Uk La63iEZMMhHGqBJ59SqoXFtB+cFa5O931XHzGVAACARHUCliVLXRBXH2DY8Bvq2u7FgWYFVuMQaQl 3FCQ0bjQ==; Received: from [2601:1c0:6280:3f0::2c9a] by merlin.infradead.org with esmtpsa (Exim 4.92.3 #3 (Red Hat Linux)) id 1kQcVY-00014w-Tq; Thu, 08 Oct 2020 20:27:25 +0000 Subject: Re: [PATCH 02/35] mm: support direct memory reservation To: yulei.kernel@gmail.com, akpm@linux-foundation.org, naoya.horiguchi@nec.com, viro@zeniv.linux.org.uk, pbonzini@redhat.com Cc: linux-fsdevel@vger.kernel.org, kvm@vger.kernel.org, linux-kernel@vger.kernel.org, xiaoguangrong.eric@gmail.com, kernellwp@gmail.com, lihaiwei.kernel@gmail.com, Yulei Zhang , Xiao Guangrong References: <2fbc347a5f52591fc9da8d708fef0be238eb06a5.1602093760.git.yuleixzhang@tencent.com> From: Randy Dunlap Message-ID: <84108593-f56a-8897-2026-a27d07a4824e@infradead.org> Date: Thu, 8 Oct 2020 13:27:19 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.12.0 MIME-Version: 1.0 In-Reply-To: <2fbc347a5f52591fc9da8d708fef0be238eb06a5.1602093760.git.yuleixzhang@tencent.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 10/8/20 12:53 AM, yulei.kernel@gmail.com wrote: > diff --git a/mm/Kconfig b/mm/Kconfig > index 6c974888f86f..e1995da11cea 100644 > --- a/mm/Kconfig > +++ b/mm/Kconfig > @@ -226,6 +226,15 @@ config BALLOON_COMPACTION > scenario aforementioned and helps improving memory defragmentation. > > # > +# support for direct memory basics > +config DMEM > + bool "Direct Memory Reservation" > + def_bool n Drop the def_bool line. > + depends on SPARSEMEM > + help > + Allow reservation of memory which could be dedicated usage of dmem. dedicated to the use of dmem. or which could be for the dedicated use of dmem. > + It's the basics of dmemfs. basis -- ~Randy