From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f180.google.com (mail-wi0-f180.google.com [209.85.212.180]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id AAEB51A0034 for ; Fri, 14 Aug 2015 01:42:38 +1000 (AEST) Received: by wicne3 with SMTP id ne3so145169401wic.0 for ; Thu, 13 Aug 2015 08:42:35 -0700 (PDT) Message-ID: <55CCBAE8.8090502@plexistor.com> Date: Thu, 13 Aug 2015 18:42:32 +0300 From: Boaz Harrosh MIME-Version: 1.0 To: Christoph Hellwig CC: torvalds@linux-foundation.org, axboe@kernel.dk, linux-mips@linux-mips.org, linux-ia64@vger.kernel.org, linux-nvdimm@ml01.01.org, dhowells@redhat.com, sparclinux@vger.kernel.org, egtvedt@samfundet.no, linux-arch@vger.kernel.org, linux-s390@vger.kernel.org, x86@kernel.org, dwmw2@infradead.org, hskinnemoen@gmail.com, linux-xtensa@linux-xtensa.org, grundler@parisc-linux.org, realmz6@gmail.com, alex.williamson@redhat.com, linux-metag@vger.kernel.org, monstr@monstr.eu, linux-parisc@vger.kernel.org, vgupta@synopsys.com, linux-kernel@vger.kernel.org, linux-alpha@vger.kernel.org, linux-media@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: Re: RFC: prepare for struct scatterlist entries without page backing References: <1439363150-8661-1-git-send-email-hch@lst.de> <55CB3F47.3000902@plexistor.com> <20150813144036.GB17375@lst.de> In-Reply-To: <20150813144036.GB17375@lst.de> Content-Type: text/plain; charset=utf-8 List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , On 08/13/2015 05:40 PM, Christoph Hellwig wrote: > On Wed, Aug 12, 2015 at 03:42:47PM +0300, Boaz Harrosh wrote: >> The support I have suggested and submitted for zone-less sections. >> (In my add_persistent_memory() patchset) >> >> Would work perfectly well and transparent for all such multimedia cases. >> (All hacks removed). In fact I have loaded pmem (with-pages) on a VRAM >> a few times and it is great easy fun. (I wanted to experiment with cached >> memory over a pcie) > > And everyone agree that it was both buggy and incomplete. > What? No one ever said anything about bugs. Is the first ever I hear of it. I was always in the notion that no one even tried it out. I'm smoking these page-full nvidimms for more than a year. With RDMA to pears and swap out to disks. So is not that bad I would say > Dan has done a respin of the page backed nvdimm work with most of > these comments addressed. > I would love some comments. All I got so far is silence. (And I do not like Dan's patches comments will come next week) > I have to say I hate both pfn-based I/O [1] and page backed nvdimms with > passion, so we're looking into the lesser evil with an open mind. > > [1] not the SGL part posted here, which I think is quite sane. The bio > side is much worse, though. > What can I say. I like the page-backed nvdimms. And the long term for me is 2M pages. I hope we can sit one day soon and you explain to me whats evil about it. I would really really like to understand Thanks though Boaz