linux-kernel - Re: [PATCH 14/15] libnvdimm: support read-only btt backing devices

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Message-ID: <x49a8vrwv7f.fsf@segfault.boston.devel.redhat.com>
Date:	Mon, 22 Jun 2015 12:42:44 -0400
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Christoph Hellwig <hch@....de>
Cc:	Dan Williams <dan.j.williams@...el.com>,
	Jens Axboe <axboe@...nel.dk>,
	"linux-nvdimm\@lists.01.org" <linux-nvdimm@...1.01.org>,
	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>,
	Linux ACPI <linux-acpi@...r.kernel.org>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH 14/15] libnvdimm: support read-only btt backing devices

Christoph Hellwig <hch@....de> writes:

> On Mon, Jun 22, 2015 at 12:00:54PM -0400, Jeff Moyer wrote:
>> Right now, the guidance should be to always use btt since there are no
>> applications that are directly taking advantage of persistent memory
>> (that I know).  I expect documentation would take care of that.  I also
>> expect that, as applications add support, they would note the
>> requirement for dax mountpoints in their documentation.
>
> It's not just DAX.  Avoiding the overhead for anything else is
> another good reason.

OK, add torn sector detection/recovery to that statement, then.  More
importantly, do you agree with the sentiment or not?

Cheers,
Jeff
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