dma-driver

Build Kernel Module/Driver

1. Install prerequisites, e.g. on Ubuntu install the following packages:

$ sudo apt install build-essential linux-headers-generic

2. Build kernel module

$ cd driver
$ make

Setup Hugepages

1. Create a group for users of hugepages, and retrieve its GID (in this example, 1001) then add yourself to the group.

$ sudo groupadd hugetlbfs

$ sudo getent group hugetlbfs

$ sudo adduser dasidler hugetlbfs

2. Edit /etc/sysctl.conf and add this text to specify the number of pages you want to reserve (see page-size)

# Allocate 8192*2MiB for HugePageTables
vm.nr_hugepages = 8192

# Members of group hugetlbfs(1001) can allocate "huge" shared memory segments
vm.hugetlb_shm_group = 1001

3. Create a mount point for the file system

$ mkdir /media/huge

4. Add this line in /etc/fstab (The mode 1770 allows anyone in the group to create files but not unlink or rename each other's files.)

# hugetlbfs
hugetlbfs /media/huge hugetlbfs mode=1770,gid=1001 0 0

5. Reboot

6. Add the following line to /etc/security/limits.conf to configure the amount of memory a user can lock, so an application can't crash your operating system by locking all the memory.

@hugetlbfs	hard	memlock		1048576