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

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if ! ismounted /dev/shm; then
mkdir -m 0755 /dev/shm
mount -t tmpfs -o mode=1777,nosuid,nodev,strictatime tmpfs /dev/shm >/dev/null
fi
if ! ismounted /run; then
mkdir -m 0755 /newrun
mount -t tmpfs -o mode=0755,nosuid,nodev,strictatime tmpfs /newrun >/dev/null
cp -a /run/* /newrun >/dev/null 2>&1
mount --move /newrun /run
rm -fr -- /newrun
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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mount -t tmpfs -o mode=1777,nosuid,nodev,strictatime,size=20% tmpfs /dev/shm >/dev/null
mount -t tmpfs -o mode=1777,nosuid,nodev,strictatime,size=10m tmpfs /dev/shm >/dev/null
mount -t tmpfs -o mode=1777,nosuid,nodev,strictatime,nr_blocks=1000 tmpfs /dev/shm >/dev/null

ITPub博客

Default tmpfs configuration

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