linux-kernel - [PATCH v2 0/2] mm/ksm: fix some accounting problems

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Message-Id: <20240513-b4-ksm-counters-v2-0-f2520183a8ca@linux.dev>
Date: Mon, 13 May 2024 10:48:35 +0800
From: Chengming Zhou <chengming.zhou@...ux.dev>
To: Andrew Morton <akpm@...ux-foundation.org>, 
 David Hildenbrand <david@...hat.com>, Hugh Dickins <hughd@...gle.com>, 
 Andrea Arcangeli <aarcange@...hat.com>, Stefan Roesch <shr@...kernel.io>, 
 xu xin <xu.xin16@....com.cn>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org, 
 zhouchengming@...edance.com, Chengming Zhou <chengming.zhou@...ux.dev>
Subject: [PATCH v2 0/2] mm/ksm: fix some accounting problems

Changes in v2:
- Add Fixes and Acked-by tags from David Hildenbrand, thanks!
- Inline atomic_long_read(&ksm_zero_pages), per David Hildenbrand.
- Don't include the last two optimization patches to keep this fix
  simple.
- Link to v1: https://lore.kernel.org/r/20240508-b4-ksm-counters-v1-0-e2a9b13f70c5@linux.dev

We encounter some abnormal ksm_pages_scanned and ksm_zero_pages during
some random tests.

1. ksm_pages_scanned unchanged even ksmd scanning has progress.
2. ksm_zero_pages maybe -1 in some rare cases.

Thanks for review and comments!

Signed-off-by: Chengming Zhou <chengming.zhou@...ux.dev>
---
Chengming Zhou (2):
      mm/ksm: fix ksm_pages_scanned accounting
      mm/ksm: fix ksm_zero_pages accounting

 fs/proc/base.c           |  2 +-
 include/linux/ksm.h      | 17 ++++++++++++++---
 include/linux/mm_types.h |  2 +-
 mm/ksm.c                 | 17 +++++++----------
 4 files changed, 23 insertions(+), 15 deletions(-)
---
base-commit: fb0f40125feec3de7ef4524600ac83946207117e
change-id: 20240508-b4-ksm-counters-04817b40d3ee

Best regards,
-- 
Chengming Zhou <chengming.zhou@...ux.dev>