임베디드에서는 swap partition을 쓰기가 힘들다.

뭐, 쓸일도 대부분 없기는 하지만, 가끔가다가 필요한 경우도 생길지 모른다.

해서 함 자료를 찾아봤다.

레드햇 문서에 맘에 드는게 있어서 스크랩했고, 조금 더 자세한 것은 같이 첨부된 문서와

swapon 관련 문서를 참조하면 된다.

- To add a swap file:

Determine the size of the new swap file and multiple by 1024 to determine the block size.
For example, the block size of a 64 MB swap file is 65536.

1. At a shell prompt as root, type the following command with count being equal to the desired block size:

# dd if=/dev/zero of=/swapfile bs=1024 count=65536
 

2. Setup the swap file with the command:

# mkswap /swapfile
 

3. To enable the swap file immediately but not automatically at boot time:

# swapon /swapfile
 

4. To enable it at boot time, edit /etc/fstab to include:

/swapfile               swap                    swap    defaults        0 0
 

5. The next time the system boots, it will enable the new swap file.
After adding the new swap file and enabling it, make sure it is enabled by viewing the output of the
command cat /proc/swaps or free.

- To remove a swap file:

1. At a shell prompt as root, execute the following command to disable the swap file
(where /swapfile is the swap file):

# swapoff /swapfile
 
2. Remove its entry from /etc/fstab.

3. Remove the actual file:

# rm /swapfile