KSM can save memory by merging identical pages, but also can consume additional memory, because it needs to generate rmap_items to save each scanned page's brief rmap information. To determine how beneficial the ksm-policy (like madvise), they are using brings, so we add a new interface /proc/<pid>/ksm_alloced_items for each process to indicate the total allocated ksm rmap_items of this process. The detailed description can be seen in the following patches' commit message. *** BLURB HERE *** xu xin (2): ksm: count allocated ksm rmap_items for each process ksm: add profit monitoring documentation Documentation/admin-guide/mm/ksm.rst | 36 ++++++++++++++++++++++++++++ fs/proc/base.c | 15 ++++++++++++ include/linux/mm_types.h | 5 ++++ mm/ksm.c | 2 ++ 4 files changed, 58 insertions(+) -- 2.25.1
