linux-kernel - Re: [PATCH] pramdisk: new block disk driver to perform persistent storage

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Message-ID: <20150918161813.GA4274@linux.intel.com>
Date:	Fri, 18 Sep 2015 10:18:13 -0600
From:	Ross Zwisler <ross.zwisler@...ux.intel.com>
To:	Lin Yongting <linyongting@...wei.com>
Cc:	ross.zwisler@...ux.intel.com, dan.j.williams@...el.com,
	axboe@...com, akpm@...ux-foundation.org, richard@....at,
	willy@...ux.intel.com, wangxiaozhe@...wei.com, mingo@...nel.org,
	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] pramdisk: new block disk driver to perform persistent
 storage

On Fri, Sep 18, 2015 at 03:46:30PM +0800, Lin Yongting wrote:
> In embed devices, user space applications will use reserved memory
> (i.e. persistent memory) to store business data, the data is kept
> in this memory region after system rebooting or panic.
> 
> pramdisk is a block disk driver based on Persistent memory, it provide
> file system interface for application to read/write data in persistent
> memory. Application can use pramdisk to store log file or business data
> in persistent memory in the way of file system operation, avoid operating
> or managing memory directly.
> 
> pramdisk support multiple Persistent menory regions and each one is a
> block device named as /dev/pram<N>.
> 
> Usage:
> modprobe pramdisk.ko pmem=<size1>@<addr2> [ pmem=<size2>@<addr2> ... ]
> 
> For example:
>   modprobe pramdisk.ko pmem=20M@...0M pmem=20M@...0M
>   mkfs.ext3 /dev/pram1
>   mkdir /tmp/test1
>   mount -t ext3 /dev/pram1 /tmp/test1
> 
> Signed-off-by: Lin Yongting <linyongting@...wei.com>
> Signed-off-by: Wang xiaozhe <wangxiaozhe@...wei.com>

I think you already have this functionality with the PMEM driver and the
memmap=nn[KMG]!ss[KMG] command line parameter?  What are you trying to
accomplish with this driver that you can't do with PMEM?
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