linux-kernel - [PATCH v9 0/5] ksm: support tracking KSM-placed zero-pages

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <202305241351365661923@zte.com.cn>
Date:   Wed, 24 May 2023 13:51:36 +0800 (CST)
From:   <yang.yang29@....com.cn>
To:     <akpm@...ux-foundation.org>, <david@...hat.com>
Cc:     <imbrenda@...ux.ibm.com>, <linux-kernel@...r.kernel.org>,
        <linux-mm@...ck.org>, <ran.xiaokai@....com.cn>,
        <xu.xin.sc@...il.com>, <xu.xin16@....com.cn>,
        <yang.yang29@....com.cn>, <jiang.xuexin@....com.cn>
Subject: [PATCH v9 0/5] ksm: support tracking KSM-placed zero-pages

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

The core idea of this patch set is to enable users to perceive the number
of any pages merged by KSM, regardless of whether use_zero_page switch has
been turned on, so that users can know how much free memory increase is
really due to their madvise(MERGEABLE) actions. But the problem is, when
enabling use_zero_pages, all empty pages will be merged with kernel zero
pages instead of with each other as use_zero_pages is disabled, and then
these zero-pages are no longer monitored by KSM.

The motivations to do this is seen at:
https://lore.kernel.org/lkml/202302100915227721315@zte.com.cn/

In one word, we hope to implement the support for KSM-placed zero pages
tracking without affecting the feature of use_zero_pages, so that app
developer can also benefit from knowing the actual KSM profit by getting
KSM-placed zero pages to optimize applications eventually when
/sys/kernel/mm/ksm/use_zero_pages is enabled.

Change log
----------
v8->v9:
------
(1) The previous [PATCH v8 4/6] is squashed into the current [PATCH v9 2/5].

(2) Improve the codes as David's suggestions.

v7->v8:
-------
(1) Since [1] which fix the bug of pte_mkdirty on sparc64 that makes pte
    writable, then we can remove the architechture restrictions of our
	features.
(2) Improve the scheme of update ksm_zero_pages: add the handling case when
    khugepaged replaces a shared zeropage by a THP. 

[1] https://lore.kernel.org/all/20230411141529.428991-2-david@redhat.com/

v6->v7:
-------
This is an all-newed version which is different from v6 which relys on KSM's
rmap_item. The patch series don't rely on rmap_item but pte_dirty, so the
general handling of tracking KSM-placed zero-pages is simplified a lot.

For safety, we restrict this feature only to the tested and known-working
architechtures (ARM, ARM64, and X86) fow now.

xu xin (5):
  ksm: support unsharing KSM-placed zero pages
  ksm: count all zero pages placed by KSM
  ksm: add ksm zero pages for each process
  ksm: consider KSM-placed zeropages when calculating KSM profit
  selftest: add a testcase of ksm zero pages

 Documentation/admin-guide/mm/ksm.rst              | 25 ++++++--
 fs/proc/base.c                                    |  1 +
 include/linux/ksm.h                               | 22 +++++++
 include/linux/mm_types.h                          |  9 ++-
 mm/khugepaged.c                                   |  2 +
 mm/ksm.c                                          | 28 ++++++--
 mm/memory.c                                       |  5 +-
 tools/testing/selftests/mm/ksm_functional_tests.c | 78 ++++++++++++++++++++++-
 8 files changed, 154 insertions(+), 16 deletions(-)

-- 
2.15.2