linux-kernel - [PATCH 0/3] ksm: fix incorrect count of merged pages when enabling use_zero

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Message-Id: <20220929025206.280970-1-xu.xin16@zte.com.cn>
Date:   Thu, 29 Sep 2022 02:52:06 +0000
From:   xu.xin.sc@...il.com
To:     akpm@...ux-foundation.org, david@...hat.com,
        imbrenda@...ux.vnet.ibm.com
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        xu xin <xu.xin16@....com.cn>
Subject: [PATCH 0/3] ksm: fix incorrect count of merged pages when enabling use_zero_pages

From: xu xin <xu.xin16@....com.cn>

Before enabling use_zero_pages by setting /sys/kernel/mm/ksm/
use_zero_pages to 1, pages_sharing of KSM is basically accurate. But
after enabling use_zero_pages, all empty pages that are merged with
kernel zero page are not counted in pages_sharing or pages_shared.
That is because the rmap_items of these ksm zero pages are not
appended to The Stable Tree of KSM.

We need to add the count of empty pages to let users know how many empty
pages are merged with kernel zero page(s).

Please see the subsequent patches for details.

*** BLURB HERE ***

xu xin (3):
  ksm: abstract the function try_to_get_old_rmap_item
  ksm: add the accounting of zero pages merged by use_zero_pages
  ksm: add zero_pages_merged in Documentation

 Documentation/admin-guide/mm/ksm.rst |  10 ++-
 mm/ksm.c                             | 122 +++++++++++++++++++++------
 2 files changed, 106 insertions(+), 26 deletions(-)

-- 
2.25.1