linux-kernel - [PATCH 0/2] don't use mapcount() to check large folio sharing

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Message-Id: <20230728161356.1784568-1-fengwei.yin@intel.com>
Date:   Sat, 29 Jul 2023 00:13:54 +0800
From:   Yin Fengwei <fengwei.yin@...el.com>
To:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, akpm@...ux-foundation.org,
        willy@...radead.org, vishal.moola@...il.com,
        wangkefeng.wang@...wei.com, minchan@...nel.org, yuzhao@...gle.com,
        david@...hat.com, ryan.roberts@....com, shy828301@...il.com
Cc:     fengwei.yin@...el.com
Subject: [PATCH 0/2] don't use mapcount() to check large folio sharing

In madvise_cold_or_pageout_pte_range() and madvise_free_pte_range(),
folio_mapcount() is used to check whether the folio is shared. But it's
not correct as folio_mapcount() returns total mapcount of large folio.

Use folio_estimated_sharers() here as the estimated number is enough.

Yin Fengwei (2):
  madvise: don't use mapcount() against large folio for sharing check
  madvise: don't use mapcount() against large folio for sharing check

 mm/huge_memory.c | 2 +-
 mm/madvise.c     | 6 +++---
 2 files changed, 4 insertions(+), 4 deletions(-)

-- 
2.39.2