Default tmpfs configuration

/boot/initramfs-$(uname -r).img

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1. if ! ismounted /dev/shm; then
   
2.     mkdir -m 0755 /dev/shm
   
3.     mount -t tmpfs -o mode=1777,nosuid,nodev,strictatime tmpfs /dev/shm >/dev/null
   
4. fi
   
5. 
   
6. if ! ismounted /run; then
   
7.     mkdir -m 0755 /newrun
   
8.     mount -t tmpfs -o mode=0755,nosuid,nodev,strictatime tmpfs /newrun >/dev/null
   
9.     cp -a /run/* /newrun >/dev/null 2>&1
   
10.     mount --move /newrun /run
    
11.     rm -fr -- /newrun
    
12. fi

/usr/lib/dracut/modules.d/99base/init.sh

The size of a tmpfs filesystem is actually the maximum amount of space that it could use. When the filesystem is empty, it is no using any memory. It won't allow the filesystem to contain more than that size of data, which defaults to 50 of RAM.

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1. mount -t tmpfs -o mode=1777,nosuid,nodev,strictatime,size=20% tmpfs /dev/shm >/dev/null
   
2. 
   
3. mount -t tmpfs -o mode=1777,nosuid,nodev,strictatime,size=10m tmpfs /dev/shm >/dev/null
   
4. 
   
5. mount -t tmpfs -o mode=1777,nosuid,nodev,strictatime,nr_blocks=1000 tmpfs /dev/shm >/dev/null

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转载于:http://blog.itpub.net/24644775/viewspace-2131195/