On 06.08.23 09:48, Xueshi Hu wrote:
There are currently three 'nr_hugepages' used to export the number of huge pages: 1. /proc/sys/vm/nr_hugepages 2. /sys/devices/system/node/node0/hugepages/hugepages-2048kB/nr_hugepages 3. /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages For consistency, all three 'nr_hugepages' should return the total number of huge pages. When written, the number of persistent huge pages will be adjusted to the specified value. But, /proc/sys/vm/nr_hugepages returns the number of persistent huge pages.
But that's documented behavior, no? Documentation/admin-guide/mm/hugetlbpage.rst ``/proc/sys/vm/nr_hugepages`` indicates the current number of "persistent" huge pages in the kernel's huge page pool. "Persistent" huge pages will be returned to the huge page pool when freed by a task. A user with root privileges can dynamically allocate more or free some persistent huge pages by increasing or decreasing the value of ``nr_hugepages``. -- Cheers, David / dhildenb
