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From: Dan Williams <dan.j.williams-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
To: Pankaj Gupta <pagupta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Cc: Kevin Wolf <kwolf-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Jan Kara <jack-AlSwsSmVLrQ@public.gmane.org>,
	Xiao Guangrong
	<xiaoguangrong.eric-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	KVM list <kvm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Rik van Riel <riel-ebMLmSuQjDVBDgjK7y7TUQ@public.gmane.org>,
	linux-nvdimm
	<linux-nvdimm-y27Ovi1pjclAfugRpC6u6w@public.gmane.org>,
	David Hildenbrand <david-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Linux Kernel Mailing List
	<linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Qemu Developers
	<qemu-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org>,
	Christoph Hellwig <hch-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
	Igor Mammedov <imammedo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	"Michael S. Tsirkin"
	<mst-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Stefan Hajnoczi
	<stefanha-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	zwisler-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
	lcapitulino-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	Paolo Bonzini <pbonzini-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Nitesh Narayan Lal
	<nilal-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	Eric Blake <eblake-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
Subject: Re: [PATCH v2 0/2] kvm "fake DAX" device
Date: Sat, 13 Oct 2018 09:06:07 -0700	[thread overview]
Message-ID: <CAPcyv4gEVxoNFUmFctSR6nRku_Pcz2GfXB+-iHBARmc+Wa+dfQ@mail.gmail.com> (raw)
In-Reply-To: <20181013050021.11962-1-pagupta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>

On Fri, Oct 12, 2018 at 10:00 PM Pankaj Gupta <pagupta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> wrote:
>
>  This patch series has implementation for "fake DAX".
>  "fake DAX" is fake persistent memory(nvdimm) in guest
>  which allows to bypass the guest page cache. This also
>  implements a VIRTIO based asynchronous flush mechanism.

Can we stop calling this 'fake DAX', because it isn't 'DAX' and it's
starting to confuse people. This enabling is effectively a
host-page-cache-passthrough mechanism not DAX. Let's call the whole
approach virtio-pmem, and leave DAX out of the name to hopefully
prevent people from wondering why some DAX features are disabled with
this driver. For example MAP_SYNC is not compatible with this
approach.

Additional enabling is need to disable MAP_SYNC in the presence of a
virtio-pmem device. See the rough proposal here:

    https://lkml.org/lkml/2018/4/25/756

  parent reply	other threads:[~2018-10-13 16:06 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-10-13  5:00 [PATCH v2 0/2] kvm "fake DAX" device Pankaj Gupta
     [not found] ` <20181013050021.11962-1-pagupta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-10-13  5:00   ` [PATCH v2 1/2] libnvdimm: nd_region flush callback support Pankaj Gupta
2018-10-13  8:31     ` kbuild test robot
     [not found]     ` <20181013050021.11962-2-pagupta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-10-13  9:38       ` kbuild test robot
2018-10-13 16:06   ` Dan Williams [this message]
2018-10-13 16:29     ` [Qemu-devel] [PATCH v2 0/2] kvm "fake DAX" device Pankaj Gupta
2018-10-13  5:00 ` [PATCH v2 2/2] virtio-pmem: Add virtio pmem driver Pankaj Gupta
     [not found]   ` <20181013050021.11962-3-pagupta-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2018-10-13 16:10     ` Dan Williams
     [not found]       ` <CAPcyv4hroaVWA-HgjWCnr7QTd_y7U8sCvS+Up733ttnD6_cKzQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-10-17 19:11         ` [Qemu-devel] " Pankaj Gupta
2018-10-17 19:36           ` Dan Williams
2018-10-18  1:44             ` Pankaj Gupta

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