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I have 8GB RAM:

» cat /proc/meminfo 
MemTotal:        8096188 kB

But I am using way more than that just with the mounted tmpfs:

» sudo df -ha | grep tmpfs
tmpfs           791M  9,9M  781M   2% /run
tmpfs           3,9G   79M  3,8G   2% /dev/shm
tmpfs           5,0M  4,0K  5,0M   1% /run/lock
tmpfs           3,9G     0  3,9G   0% /sys/fs/cgroup
tmpfs           3,9G  3,4M  3,9G   1% /tmp
tmpfs           3,9G     0  3,9G   0% /var/tmp
tmpfs           3,9G  1,4M  3,9G   1% /var/log
tmpfs           3,9G     0  3,9G   0% /var/spool
tmpfs           791M   92K  791M   1% /run/user/1000

Obviously I am misunderstanding something here. Are the tmpfs sharing memory? Are they not maxing out? Will this be a problem if they start growing?

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Please read this

For all the tmpfs mounts, "Avail" is an artificial limit. The default size for tmpfs mounts is half your RAM. It can be adjusted at mount time. (man mount, scroll to tmpfs).

Consider also that the limit of your tmpfs is half of your memmory (Physical memmory + SWAP)

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