linux-kernel - Re: RFC: prepare for struct scatterlist entries without page backing

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Date:	Thu, 13 Aug 2015 16:40:36 +0200
From:	Christoph Hellwig <hch@....de>
To:	Boaz Harrosh <boaz@...xistor.com>
Cc:	Christoph Hellwig <hch@....de>, torvalds@...ux-foundation.org,
	axboe@...nel.dk, linux-mips@...ux-mips.org,
	linux-ia64@...r.kernel.org, linux-nvdimm@...1.01.org,
	dhowells@...hat.com, sparclinux@...r.kernel.org,
	egtvedt@...fundet.no, linux-arch@...r.kernel.org,
	linux-s390@...r.kernel.org, x86@...nel.org, dwmw2@...radead.org,
	hskinnemoen@...il.com, linux-xtensa@...ux-xtensa.org,
	grundler@...isc-linux.org, realmz6@...il.com,
	alex.williamson@...hat.com, linux-metag@...r.kernel.org,
	monstr@...str.eu, linux-parisc@...r.kernel.org,
	vgupta@...opsys.com, linux-kernel@...r.kernel.org,
	linux-alpha@...r.kernel.org, linux-media@...r.kernel.org,
	linuxppc-dev@...ts.ozlabs.org
Subject: Re: RFC: prepare for struct scatterlist entries without page
	backing

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.

Dan has done a respin of the page backed nvdimm work with most of
these comments addressed.

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.
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