Hello,
I have a CentOS 7 installation on baremetal with 2 CPUs, 10 cores each and HT enabled, 128 GB RAM.
The system has transparent hugetables enabled.
cat /sys/kernel/mm/transparent_hugepage/enabled [always] madvise never
The system reports anonymous hugepages pages usage and a size of hugepage of 2048Kb
cat /proc/meminfo |grep -i hugepages|grep AnonHugePages AnonHugePages: 35491840 kB
cat /proc/meminfo |grep -i hugepages|grep Hugepagesize Hugepagesize: 2048 kB
Anyway, checking the /proc/<pid>/smaps for each and every process on the system, the KernelPageSize reports 4K pages only.
for i in `ls /proc/|egrep '[0-9]+'` ; do grep 'KernelPageSize: ' /proc/$i/smaps; done|grep ' 4 kB'|wc -l 9758 for i in `ls /proc/|egrep '[0-9]+'` ; do grep 'KernelPageSize: ' /proc/$i/smaps; done|grep -v ' 4 kB'|wc -l 0
So it turns out that even is I have the THP enabled the pages still have a size of 4K .
Is there any extra setup in order to get 2MB pages ?
Thanks, Laurentiu