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Tue, 23 Sep 2025 07:03:19 -0400 (EDT) From: Kiryl Shutsemau To: Andrew Morton , David Hildenbrand , Hugh Dickins , Matthew Wilcox Cc: Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Rik van Riel , Harry Yoo , Johannes Weiner , Shakeel Butt , Baolin Wang , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Kiryl Shutsemau Subject: [PATCHv3 2/5] mm/rmap: mlock large folios in try_to_unmap_one() Date: Tue, 23 Sep 2025 12:03:07 +0100 Message-ID: <20250923110310.689126-3-kirill@shutemov.name> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250923110310.689126-1-kirill@shutemov.name> References: <20250923110310.689126-1-kirill@shutemov.name> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Kiryl Shutsemau Currently, try_to_unmap_once() only tries to mlock small folios. Use logic similar to folio_referenced_one() to mlock large folios: only do this for fully mapped folios and under page table lock that protects all page table entries. Signed-off-by: Kiryl Shutsemau Reviewed-by: Shakeel Butt --- mm/rmap.c | 31 ++++++++++++++++++++++++++++--- 1 file changed, 28 insertions(+), 3 deletions(-) diff --git a/mm/rmap.c b/mm/rmap.c index 3d0235f332de..a55c3bf41287 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1870,6 +1870,7 @@ static bool try_to_unmap_one(struct folio *folio, str= uct vm_area_struct *vma, unsigned long nr_pages =3D 1, end_addr; unsigned long pfn; unsigned long hsz =3D 0; + int ptes =3D 0; =20 /* * When racing against e.g. zap_pte_range() on another cpu, @@ -1910,10 +1911,34 @@ static bool try_to_unmap_one(struct folio *folio, s= truct vm_area_struct *vma, */ if (!(flags & TTU_IGNORE_MLOCK) && (vma->vm_flags & VM_LOCKED)) { + ptes++; + + /* + * Set 'ret' to indicate the page cannot be unmapped. + * + * Do not jump to walk_abort immediately as additional + * iteration might be required to detect fully mapped + * folio an mlock it. + */ + ret =3D false; + + /* Only mlock fully mapped pages */ + if (pvmw.pte && ptes !=3D pvmw.nr_pages) + continue; + + /* + * All PTEs must be protected by page table lock in + * order to mlock the page. + * + * If page table boundary has been cross, current ptl + * only protect part of ptes. + */ + if (pvmw.flags & PVMW_PGTABLE_CROSSSED) + goto walk_done; + /* Restore the mlock which got missed */ - if (!folio_test_large(folio)) - mlock_vma_folio(folio, vma); - goto walk_abort; + mlock_vma_folio(folio, vma); + goto walk_done; } =20 if (!pvmw.pte) { --=20 2.50.1