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From: Dan Williams <dan.j.williams@intel.com>
To: Mikulas Patocka <mpatocka@redhat.com>
Cc: Christoph Hellwig <hch@infradead.org>,
	"linux-nvdimm@lists.01.org" <linux-nvdimm@lists.01.org>,
	Christoph Hellwig <hch@lst.de>, Linux MM <linux-mm@kvack.org>,
	dm-devel@redhat.com, Ross Zwisler <ross.zwisler@linux.intel.com>,
	Laura Abbott <labbott@redhat.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [dm-devel] [PATCH] vmalloc: introduce vmap_pfn for persistent memory
Date: Wed, 8 Nov 2017 12:25:49 -0800	[thread overview]
Message-ID: <CAPcyv4imHXhcd8WgW5ygrKKNiVr0cDZLi2Ue5WDy=_RmqECnvw@mail.gmail.com> (raw)
In-Reply-To: <alpine.LRH.2.02.1711081514320.29922@file01.intranet.prod.int.rdu2.redhat.com>

On Wed, Nov 8, 2017 at 12:15 PM, Mikulas Patocka <mpatocka@redhat.com> wrote:
>
>
> On Wed, 8 Nov 2017, Dan Williams wrote:
>
>> On Wed, Nov 8, 2017 at 7:35 AM, Christoph Hellwig <hch@infradead.org> 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?
>

Yes, that would be my recommendation. You can see that filesystem-dax
is on its way to dropping page-less support in this series:

   https://lists.01.org/pipermail/linux-nvdimm/2017-October/013125.html

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  reply	other threads:[~2017-11-08 20:25 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-11-07 22:03 [PATCH] vmalloc: introduce vmap_pfn for persistent memory Mikulas Patocka
2017-11-08  9:59 ` Christoph Hellwig
2017-11-08 12:33   ` Mikulas Patocka
2017-11-08 15:04     ` Christoph Hellwig
2017-11-08 15:21       ` Mikulas Patocka
2017-11-08 15:35         ` [dm-devel] " Christoph Hellwig
2017-11-08 15:41           ` Dan Williams
2017-11-08 20:15             ` Mikulas Patocka
2017-11-08 20:25               ` Dan Williams [this message]
2017-11-09 16:40                 ` Mikulas Patocka
2017-11-09 16:45                   ` Dan Williams
2017-11-09 17:30                     ` Mikulas Patocka
2017-11-09 17:35                       ` Dan Williams
2017-11-08 17:42           ` Mikulas Patocka
2017-11-08 17:47             ` Christoph Hellwig
2017-11-08 20:26               ` Mikulas Patocka
2017-11-08 21:26                 ` Dan Williams
2017-11-09 16:37                   ` Mikulas Patocka
2017-11-09 16:49                     ` Dan Williams
2017-11-09 18:13                       ` Mikulas Patocka
2017-11-09 18:38                         ` Dan Williams
2017-11-09 18:51                           ` Mikulas Patocka
2017-11-09 18:58                             ` Dan Williams

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