Messages in this thread | | | Subject | Re: [PATCH] pramdisk: new block disk driver to perform persistent storage | From | Lin Yongting <> | Date | Mon, 21 Sep 2015 17:30:07 +0800 |
| |
On 2015/9/19 0:18, Ross Zwisler wrote: > 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@2050M pmem=20M@2150M >> mkfs.ext3 /dev/pram1 >> mkdir /tmp/test1 >> mount -t ext3 /dev/pram1 /tmp/test1 >> >> Signed-off-by: Lin Yongting <linyongting@huawei.com> >> Signed-off-by: Wang xiaozhe <wangxiaozhe@huawei.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?
Hi Ross, thanks!
I dig into nvdimm sub-system these two day and found that PMEM can make Reserved Memory as block disk to mount file system on it.
But I am curious about two things: 1. seems memmap command line parameter is not available at ARM arch. Can we use module parameter rather than kernel command parameter? 2. If I specified two memmap regions(which they are Adjacent to each other), Can we get tow block device?
Thanks Again.
Best Regards!
-- Lin Yongting
| |