[CentOS] Transparent HugePages question
Laurentiu Soica
laurentiu at soica.roWed Aug 24 15:03:02 UTC 2016
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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 -- Laurentiu Soica
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