linux-kernel - [RFC PATCH v2 0/4] mm/madvise: remove redundant mmap_lock operations from process

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Message-Id: <20250117013058.1843-1-sj@kernel.org>
Date: Thu, 16 Jan 2025 17:30:54 -0800
From: SeongJae Park <sj@...nel.org>
To: 
Cc: SeongJae Park <sj@...nel.org>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Hildenbrand <david@...hat.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Shakeel Butt <shakeel.butt@...ux.dev>,
	Vlastimil Babka <vbabka@...e.cz>,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [RFC PATCH v2 0/4] mm/madvise: remove redundant mmap_lock operations from process_madvise()

process_madvise() calls do_madvise() for each address range.  Then, each
do_madvise() invocation holds and releases same mmap_lock.  Optimize the
redundant lock operations by splitting do_madvise() internal logics
including the mmap_lock operations, and calling the small logics
directly from process_madvise() in a sequence that removes the redundant
locking.

Changes from RFC v1 (20250111004618.1566-1-sj@...nel.org)
- Split out do_madvise() and use those from vector_madvise(), instead of
  adding a flag to do_madvise() (Liam R. Howlett)

SeongJae Park (4):
  mm/madvise: split out mmap locking operations for madvise()
  mm/madvise: split out madvise input validity check
  mm/madvise: split out madvise() behavior execution
  mm/madvise: remove redundant mmap_lock operations from
    process_madvise()

 mm/madvise.c | 150 +++++++++++++++++++++++++++++++++++----------------
 1 file changed, 103 insertions(+), 47 deletions(-)


base-commit: b43ba6938d01ad4487028592109d4116a28b7afa
-- 
2.39.5