linux-kernel - [PATCH 0/5] Misc rework on hugetlb

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Message-ID: <20250612134701.377855-1-osalvador@suse.de>
Date: Thu, 12 Jun 2025 15:46:56 +0200
From: Oscar Salvador <osalvador@...e.de>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: David Hildenbrand <david@...hat.com>,
	Muchun Song <muchun.song@...ux.dev>,
	James Houghton <jthoughton@...gle.com>,
	Peter Xu <peterx@...hat.com>,
	Gavin Guo <gavinguo@...lia.com>,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Oscar Salvador <osalvador@...e.de>
Subject: [PATCH 0/5] Misc rework on hugetlb_fault

 RFC -> v1:
  - Stop looking up folio in the pagecache for detecting a COW
    on a private mapping.
  - Document the locks

Hi,

This is a new version of the RFC I sent a couple of weeks ago [1].
It's the conclusion of the discussions that ocurred in that thread.

Patch#1 is the fix for the deadlock.
Patch#2 is to document why we take the lock, so none of us have to spend
time again in figuring that out.
Patch#3-5 are a bit of cleanup (removing obsolete comments etc.)

More detail in every patch.

Oscar Salvador (5):
  mm,hugetlb: Change mechanism to detect a COW on private mapping
  mm,hugetlb: Document the reason to lock the folio in the faulting path
  mm,hugetlb: Conver anon_rmap into boolean
  mm,hugetlb: Drop obsolete comment about non-present pte and second
    faults
  mm,hugetlb: Drop unlikelys from hugetlb_fault

 mm/hugetlb.c | 98 +++++++++++++++++++---------------------------------
 1 file changed, 36 insertions(+), 62 deletions(-)

-- 
2.49.0