linux-kernel - Re: another pmem variant V2

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Date:	Thu, 26 Mar 2015 18:18:58 +0100
From:	Christoph Hellwig <hch@....de>
To:	Boaz Harrosh <boaz@...xistor.com>
Cc:	linux-nvdimm@...1.01.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, x86@...nel.org,
	ross.zwisler@...ux.intel.com, axboe@...nel.dk
Subject: Re: another pmem variant V2

On Thu, Mar 26, 2015 at 06:57:47PM +0200, Boaz Harrosh wrote:
> For one this auto discovery of yours is very (very) nice but is a bit
> inconvenience. Before I would reserve a big chuck on each NUMA range
> on Kernel's memmap=  And then at pmem map= would slice and dice it
> as I want hot style on modprobe with no need for reboot. Now I need
> to do it on reboot theoretically. (You know xfstest needs lots of devices
> some big some small ;-))

Slicing up a block device based on kernel options is not exactly a smart
idea.  We have partitions that are perfectly fine for that.  If you
really don't are about persistance of your partitioning you can just
set up a device mapper table.  No need to reinvent the wheel.

> Also with the modprob pmem map= I was supporting a PCIE memory card but
> I guess I need to throw this one out the door.

Send it my way to support it properly...  Just like any other PCIe device it
should have a proper driver.  For now it can register a pmem platform device,
but when you submit it I'd rather add slightly more low-level versions
of pmem_probe and pmem_remove that take a struct device * and possibly
a resource structure so that you can directly call into it.
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