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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20150813144036.GB17375@lst.de>
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.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/