On 13.09.23 19:30, Sourav Panda wrote:
Adds a new per-node PageMetadata field to /sys/devices/system/node/nodeN/meminfo and a global PageMetadata field to /proc/meminfo. This information can be used by users to see how much memory is being used by per-page metadata, which can vary depending on build configuration, machine architecture, and system use. Per-page metadata is the amount of memory that Linux needs in order to manage memory at the page granularity. The majority of such memory is used by "struct page" and "page_ext" data structures.
It's probably worth mentioning, that in contrast to most other "memory consumption" statistics, this metadata might not be included "MemTotal"; when the memmap is allocated using the memblock allocator, it's not included, when it's dynamically allocated using the buddy (e.g., memory hotplug), it's included.
-- Cheers, David / dhildenb
