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=-5.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,USER_AGENT_MUTT autolearn=unavailable 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 3351CC43387 for ; Wed, 9 Jan 2019 02:39:57 +0000 (UTC) Received: from lists.ozlabs.org (lists.ozlabs.org [203.11.71.2]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 9EF5520883 for ; Wed, 9 Jan 2019 02:39:56 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9EF5520883 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 43ZCyf46dTzDqc6 for ; Wed, 9 Jan 2019 13:39:54 +1100 (AEDT) Authentication-Results: lists.ozlabs.org; spf=pass (mailfrom) smtp.mailfrom=redhat.com (client-ip=209.132.183.28; helo=mx1.redhat.com; envelope-from=aarcange@redhat.com; receiver=) Authentication-Results: lists.ozlabs.org; dmarc=pass (p=none dis=none) header.from=redhat.com Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 43ZCwp5wKTzDqc2 for ; Wed, 9 Jan 2019 13:38:18 +1100 (AEDT) Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 9FD5DC056797; Wed, 9 Jan 2019 02:38:15 +0000 (UTC) Received: from sky.random (ovpn-120-73.rdu2.redhat.com [10.10.120.73]) by smtp.corp.redhat.com (Postfix) with ESMTPS id A3C7A600C8; Wed, 9 Jan 2019 02:38:14 +0000 (UTC) Date: Tue, 8 Jan 2019 21:38:12 -0500 From: Andrea Arcangeli To: "Aneesh Kumar K.V" Subject: Re: [PATCH V6 1/4] mm/cma: Add PF flag to force non cma alloc Message-ID: <20190109023812.GF20586@redhat.com> References: <20190108045110.28597-1-aneesh.kumar@linux.ibm.com> <20190108045110.28597-2-aneesh.kumar@linux.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190108045110.28597-2-aneesh.kumar@linux.ibm.com> User-Agent: Mutt/1.11.1 (2018-12-01) X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Wed, 09 Jan 2019 02:38:16 +0000 (UTC) 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: Alexey Kardashevskiy , linux-kernel@vger.kernel.org, Michal Hocko , linux-mm@kvack.org, akpm@linux-foundation.org, linuxppc-dev@lists.ozlabs.org, David Gibson Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" On Tue, Jan 08, 2019 at 10:21:07AM +0530, Aneesh Kumar K.V wrote: > This patch add PF_MEMALLOC_NOCMA which make sure any allocation in that context > is marked non movable and hence cannot be satisfied by CMA region. > > This is useful with get_user_pages_cma_migrate where we take a page pin by > migrating pages from CMA region. Marking the section PF_MEMALLOC_NOCMA ensures > that we avoid uncessary page migration later. > > Suggested-by: Andrea Arcangeli > Signed-off-by: Aneesh Kumar K.V Reviewed-by: Andrea Arcangeli