From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ot0-f200.google.com (mail-ot0-f200.google.com [74.125.82.200]) by kanga.kvack.org (Postfix) with ESMTP id 76A7344043C for ; Wed, 8 Nov 2017 15:16:01 -0500 (EST) Received: by mail-ot0-f200.google.com with SMTP id p56so810759ote.8 for ; Wed, 08 Nov 2017 12:16:01 -0800 (PST) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id c138si2170929oig.14.2017.11.08.12.16.00 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 08 Nov 2017 12:16:00 -0800 (PST) Date: Wed, 8 Nov 2017 15:15:56 -0500 (EST) From: Mikulas Patocka Subject: Re: [dm-devel] [PATCH] vmalloc: introduce vmap_pfn for persistent memory In-Reply-To: Message-ID: References: <20171108095909.GA7390@infradead.org> <20171108150447.GA10374@infradead.org> <20171108153522.GB24548@infradead.org> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Dan Williams Cc: Christoph Hellwig , "linux-nvdimm@lists.01.org" , Christoph Hellwig , Linux MM , dm-devel@redhat.com, Ross Zwisler , Laura Abbott , "Kirill A . Shutemov" On Wed, 8 Nov 2017, Dan Williams wrote: > On Wed, Nov 8, 2017 at 7:35 AM, Christoph Hellwig wrote: > > On Wed, Nov 08, 2017 at 10:21:38AM -0500, Mikulas Patocka wrote: > >> > And what do you do for an architecture with virtuall indexed caches? > >> > >> Persistent memory is not supported on such architectures - it is only > >> supported on x86-64 and arm64. > > > > For now. But once support is added your driver will just corrupt data > > unless you have the right API in place. > > I'm also in the process of ripping out page-less dax support. With > pages we can potentially leverage the VIVT-cache support in some > architectures, likely with more supporting infrastructure for > dax_flush(). Should I remove all the code for page-less persistent memory from my driver? Mikulas -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org