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_stat for each process The value "ksm_rmap_items" in it indicates the total allocated ksm rmap_items of this process. The detailed description can be seen in the following patches' commit message. ----------- v4->v5: 1. change ksm_rmp_items to ksm_rmap_items; 2. use /proc/*/ksm_stat as proc name rather than "ksm_rmap_items" and start filling it with the value "ksm_rmap_items" so that more values can be added in future. v3->v4: Fix the wrong writing format and some misspellings of the related documentaion. v2->v3: remake the patches based on the latest linux-next branch. v1->v2: Add documentation for the new item. *** 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
