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I have a number of CoreOS servers that will be running some database workloads that highly recommend Transparent Hugepages be disabled.

However:

~$ cat /sys/kernel/mm/transparent_hugepage/enabled
cat: /sys/kernel/mm/transparent_hugepage/enabled: No such file or directory

Sure enough, the path /sys/kernel/mm/transparent_hugepage doesn't exist.

But I'm not really convinced it's switched off.

~$ cat /proc/meminfo | grep huge
HardwareCorrupted:     0 kB
AnonHugePages:         0 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:     7872512 kB
DirectMap2M:           0 kB

Which is saying my hugepagesize is currently 2M. Although nothing is using a hugepage currently.

and 

~$ mount | grep huge
hugetlbfs on /dev/hugepages type hugetlbfs (rw,relatime)

How do I make absolutely sure this feature is disabled?

hookenz
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  • Your kernel doesn't appear to even have the feature at all! – Michael Hampton May 25 '15 at 20:58
  • @MichaelHampton - you're right. I don't think I need to worry about it. On Bare metal CoreOS it's there actually. The machines above are Amazon instances, it looks like they have already disabled it. – hookenz May 25 '15 at 21:06

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