pmbd安装

一、pmbd介绍

This software implements a block device driver for persistent memory (PM).This module provides a block-based logical interface to manage PM that is physically attached to the system memory bus. 

二、编译和安装pmbd

1.Compile the PMBD driver:

$ make

2.Install the PMBD driver:

$ sudo make install

3.Check available driver information:

$ modinfo pmbd

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make之前应该将版本改为本机内核版本

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可能遇到的错误

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编译成功之后，设置PMBD的物理地址（在内存中划分属于他的地址范围）

前提是查看本机内存使用情况：

$dmesg | grep e820 //usable

1.修改/etc/grub.conf 设置物理地址

 memmap=<PM_SIZE_GB>G$<DRAM_SIZE_GB>G numa=off 

NOTE:
Assuming a total memory capacity of 24GB, and if we want to use 16GB PM and 8GB DRAM, it should be “memmap=16G$8G”.

也可理解为内存如果共24G，前8G是memory,从第8G往后16G为PM。

EXAMPLE: Assuming a 16GB PM space with physical memory addresses from 8GB to 24GB:
(1) Basic (Ramdisk):

 $ sudo modprobe pmbd mode="pmbd16;hmo8;hms16;"

(2) Protected (with private mapping):

$ sudo modprobe pmbd mode="pmbd16;hmo8;hms16;pmapY;"

(3) Protected and synced (with private mapping, non-temp store):

 $ sudo modprobe pmbd mode="pmbd16;hmo8;hms16;pmapY;ntsY;"

(4) * RECOMMENDED CONFIG* Protected, synced, and ordered (with private mapping, nt-store, write barrier):

$ sudo modprobe pmbd mode="pmbd16;hmo8;hms16;pmapY;ntsY;wbY;"

挂载成功后，可通过如下命令查看：

$lsmod | grep pmbd 

到这一步，就可以在pmbd上挂载文件系统（ext4…..）

$Sudo mkdir /mnt/pmdisk        //建立挂载目录
$Sudo fdisk /dev/pma       //分区
$Sudo mkfs.ext4 /dev/pma1  //格式化为ext4
$Sudo mount -t ext4 /dev/pma1 /mnt/pmdisk/ -o nodelalloc   //以nodelalloc方式挂载设备
$mount  //查看当前挂载目录，如下

测试脚本

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#!/bin/sh

rm -r /mnt/pmdisk
mkdir  /mnt/pmdisk
modprobe pmbd mode="pmbd16;hmo4;hms16;pmapY;"
mkfs.ext4 /dev/pma
mount /dev/pma  /mnt/pmdisk

卸载脚本

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#!/bin/sh

umount /mnt/pmdisk
rmmod pmbd