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 87945C433EF for ; Thu, 27 Jan 2022 22:27:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241815AbiA0W1o (ORCPT ); Thu, 27 Jan 2022 17:27:44 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:35150 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240706AbiA0W1i (ORCPT ); Thu, 27 Jan 2022 17:27:38 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1643322457; 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=d0FA5WCPvNytSlh5Kpb7PaP0H/+ZX/zbZ764R+kzAQc=; b=WYUxAE27dCCGGjjDh6KZdAqm8l8cGhcH2lK5PNGMgGD+u2vZ/jvbyghHc0e92/YP9qWiRs lVimEqCiT3wggcFnSEA66WBBgLu9MrIgNuyjy6ALlQHiNN9iycKb458o3Yht9IcEhQWc2b Nkho++ONliiKZSMzo4HCCLkpM8ZJeSg= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-184-w_CT1qgDNuS0vl85_t44_Q-1; Thu, 27 Jan 2022 17:27:31 -0500 X-MC-Unique: w_CT1qgDNuS0vl85_t44_Q-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 35AD314751; Thu, 27 Jan 2022 22:27:29 +0000 (UTC) Received: from segfault.boston.devel.redhat.com (segfault.boston.devel.redhat.com [10.19.60.26]) by smtp.corp.redhat.com (Postfix) with ESMTPS id D80D576606; Thu, 27 Jan 2022 22:27:27 +0000 (UTC) From: Jeff Moyer To: "Li\, Zhijian" Cc: Jason Gunthorpe , , , , , , , , , , , , "nvdimm\@lists.linux.dev" Subject: Re: [RFC PATCH rdma-next 01/10] RDMA: mr: Introduce is_pmem References: <20211228080717.10666-1-lizhijian@cn.fujitsu.com> <20211228080717.10666-2-lizhijian@cn.fujitsu.com> <20220106002130.GP6467@ziepe.ca> <4e679df5-633d-cd0c-9de3-16348b2cef35@cn.fujitsu.com> X-PGP-KeyID: 1F78E1B4 X-PGP-CertKey: F6FE 280D 8293 F72C 65FD 5A58 1FF8 A7CA 1F78 E1B4 Date: Thu, 27 Jan 2022 17:30:08 -0500 In-Reply-To: <4e679df5-633d-cd0c-9de3-16348b2cef35@cn.fujitsu.com> (Zhijian Li's message of "Fri, 14 Jan 2022 16:10:33 +0800") Message-ID: User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/26.1 (gnu/linux) MIME-Version: 1.0 Content-Type: text/plain X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org "Li, Zhijian" writes: > Copied to nvdimm list > > Thanks > > Zhijian > > > on 2022/1/6 14:12, Li Zhijian wrote: >> >> Add Dan to the party :) >> >> May i know whether there is any existing APIs to check whether >> a va/page backs to a nvdimm/pmem ? I don't know of one. You could try walk_system_ram_range looking for IORES_DESC_PERSISTENT_MEMORY, but that's not very efficient. >>> You need to get Dan to check this out, but I'm pretty sure this should >>> be more like this: >>> >>> if (is_zone_device_page(page) && page->pgmap->type == >>> MEMORY_DEVICE_FS_DAX) You forgot MEMORY_DEVICE_GENERIC. However, this doesn't guarantee the memory belongs to persistent memory, only that it is direct access capable. Dan, any ideas? -Jeff