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]

Date:	Thu, 13 Aug 2015 18:42:32 +0300
From:	Boaz Harrosh <boaz@...xistor.com>
To:	Christoph Hellwig <hch@....de>
CC:	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 08/13/2015 05:40 PM, Christoph Hellwig wrote:
> 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.
> 

What? No one ever said anything about bugs. Is the first ever I hear of it.
I was always in the notion that no one even tried it out.

I'm smoking these page-full nvidimms for more than a year. With RDMA to
pears and swap out to disks. So is not that bad I would say

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

I would love some comments. All I got so far is silence. (And I do not
like Dan's patches comments will come next week)

> 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.
> 

What can I say. I like the page-backed nvdimms. And the long term for me
is 2M pages. I hope we can sit one day soon and you explain to me whats
evil about it. I would really really like to understand

Thanks though
Boaz

--
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/