linux-kernel - [PATCH v5 0/2] ksm: count allocated rmap

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Message-Id: <20220830143731.299702-1-xu.xin16@zte.com.cn>
Date:   Tue, 30 Aug 2022 14:37:31 +0000
From:   xu xin <cgel.zte@...il.com>
To:     akpm@...ux-foundation.org, adobriyan@...il.com, willy@...radead.org
Cc:     bagasdotme@...il.com, hughd@...gle.com,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, xu xin <xu.xin16@....com.cn>
Subject: [PATCH v5 0/2] ksm: count allocated rmap_items and update documentation

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