Transparent Huge Pages (THP) warning should not print when madvise selected #3895
Description
I think this warning is causing some unnecessary grief:
30723:M 22 Mar 15:17:24.191 # WARNING you have Transparent Huge Pages (THP) support enabled in your kernel. This will create latency and memory usage issues with Redis. To fix this issue run the command 'echo never > /sys/kernel/mm/transparent_hugepage/enabled' as root, and add it to your /etc/rc.local in order to retain the setting after a reboot. Redis must be restarted after THP is disabled.
RHEL-alike distros/installs use the madvise option by default, which requires applications to opt-in to using hugepages explicitly:
$ cat /sys/kernel/mm/transparent_hugepage/enabled
always [madvise] neverAdvertising the disabling of even madvise support for hugepages is probably not for the best, as hugepages can be quite useful on some workloads with high concurrency. It may also be reasonable to re-word the warning to suggest:
echo madvise > /sys/kernel/mm/transparent_hugepage/enabled
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