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* [PATCH v9 0/5] ksm: support tracking KSM-placed zero-pages
@ 2023-05-24  5:51 yang.yang29
       [not found] ` <20230524055711.20387-1-yang.yang29@zte.com.cn>
                   ` (5 more replies)
  0 siblings, 6 replies; 13+ messages in thread
From: yang.yang29 @ 2023-05-24  5:51 UTC (permalink / raw)
  To: akpm, david
  Cc: imbrenda, linux-kernel, linux-mm, ran.xiaokai, xu.xin.sc,
	xu.xin16, yang.yang29, jiang.xuexin

From: xu xin <xu.xin16@zte.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


^ permalink raw reply	[flat|nested] 13+ messages in thread

end of thread, other threads:[~2023-05-29  1:48 UTC | newest]

Thread overview: 13+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-05-24  5:51 [PATCH v9 0/5] ksm: support tracking KSM-placed zero-pages yang.yang29
     [not found] ` <20230524055711.20387-1-yang.yang29@zte.com.cn>
2023-05-24  7:10   ` [PATCH v9 1/5] ksm: support unsharing KSM-placed zero pages David Hildenbrand
     [not found] ` <20230524055752.20449-1-yang.yang29@zte.com.cn>
2023-05-24  7:23   ` [PATCH v9 2/5] ksm: count all zero pages placed by KSM David Hildenbrand
2023-05-24  7:55     ` xu xin
2023-05-24  8:27       ` David Hildenbrand
     [not found] ` <20230524055851.20565-1-yang.yang29@zte.com.cn>
2023-05-24  7:25   ` [PATCH v9 4/5] ksm: consider KSM-placed zeropages when calculating KSM profit David Hildenbrand
     [not found] ` <20230524055906.20614-1-yang.yang29@zte.com.cn>
2023-05-24  9:11   ` [PATCH v9 5/5] selftest: add a testcase of ksm zero pages David Hildenbrand
2023-05-24  9:38     ` xu xin
2023-05-24  9:12 ` [PATCH v9 0/5] ksm: support tracking KSM-placed zero-pages David Hildenbrand
     [not found] ` <20230524055800.20498-1-yang.yang29@zte.com.cn>
2023-05-24  7:24   ` [PATCH v9 3/5] ksm: add ksm zero pages for each process David Hildenbrand
2023-05-25  3:36   ` kernel test robot
2023-05-25  6:56   ` kernel test robot
2023-05-29  1:48     ` xu xin

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