linux-kernel - Re: [Linux-nvdimm] [PATCH v2] pmem: Initial version of persistent memory driver

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Date:	Thu, 11 Sep 2014 13:45:14 +0300
From:	Boaz Harrosh <boaz@...xistor.com>
To:	Dan Williams <dan.j.williams@...el.com>
CC:	Boaz Harrosh <openosd@...il.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	Jens Axboe <axboe@...nel.dk>,
	Matthew Wilcox <matthew.r.wilcox@...el.com>,
	Nick Piggin <npiggin@...nel.dk>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-nvdimm@...ts.01.org
Subject: Re: [Linux-nvdimm] [PATCH v2] pmem: Initial version of persistent
 memory driver

On 09/11/2014 02:01 AM, Dan Williams wrote:
<>
> 
> Imagine you want to deploy a policy like "use half of the memory
> provided by the dimm in slot3, i.e. the only one with a battery".
> That sort of thing gets unwieldy in a command line string compared to
> a description table format that we can update at will.
> 

Actually it is easy to do, why? I do this here in the lab all the time.
with a "command line" with this code you see here.

[DDR3 NvDIMM which means I need memmap=16G\$32G on Kernel command line.
 Then: modprobe pmem map=8G@32G,4G@44G,...
 and so on Just as a simple example where 2/4-3/4 addresses are not used.
 You can have holes in the middle or what ever you want. This here is just
 a table in comma-separated format. If we need like flags in future we can
 extend the format to nn@ss:flags, but I do no have any 3rd column yet]

And again I have in the pipe a dynamic interface added on top of
the module param one. So it will all be there soon. Without reverting
the old one.

Thanks
Boaz

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