Memcg Memfs Info

Overview

Support to print rootfs files and tmpfs files that having pages charged in given memory cgroup. The files infomations can be printed through interface “memory.memfs_files_info” or printed when OOM is triggered.

User control

1. /sys/kernel/mm/memcg_memfs_info/enable

Boolean type. The default value is 0, set it to 1 to enable the feature.

2. /sys/kernel/mm/memcg_memfs_info/max_print_files_in_oom

Unsigned long type. The default value is 500, indicating that the maximum of files can be print to console when OOM is triggered.

3. /sys/kernel/mm/memcg_memfs_info/size_threshold

Unsigned long type. The default value is 0, indicating that the minimum size of files that can be printed.

4. /sys/fs/cgroup/memory/<memory>/memory.memfs_files_info

Outputs the files who use memory in this memory cgroup.

— Liu Shixin, Jan 2022