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Mon, 15 Dec 2025 01:06:26 -0800 (PST) From: Vernon Yang X-Google-Original-From: Vernon Yang To: akpm@linux-foundation.org, david@kernel.org, lorenzo.stoakes@oracle.com Cc: ziy@nvidia.com, npache@redhat.com, baohua@kernel.org, lance.yang@linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Vernon Yang Subject: [PATCH 4/4] mm: khugepaged: set to next mm direct when mm has MMF_DISABLE_THP_COMPLETELY Date: Mon, 15 Dec 2025 17:04:19 +0800 Message-ID: <20251215090419.174418-5-yanglincheng@kylinos.cn> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251215090419.174418-1-yanglincheng@kylinos.cn> References: <20251215090419.174418-1-yanglincheng@kylinos.cn> 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" When an mm with the MMF_DISABLE_THP_COMPLETELY flag is detected during scanning, directly set khugepaged_scan.mm_slot to the next mm_slot, reduce redundant operation. Signed-off-by: Vernon Yang --- mm/khugepaged.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 91836dda2015..a8723eea12f1 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -2432,6 +2432,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned = int pages, int *result, =20 cond_resched(); if (unlikely(hpage_collapse_test_exit_or_disable(mm))) { + vma =3D NULL; progress++; break; } @@ -2452,8 +2453,10 @@ static unsigned int khugepaged_scan_mm_slot(unsigned= int pages, int *result, bool mmap_locked =3D true; =20 cond_resched(); - if (unlikely(hpage_collapse_test_exit_or_disable(mm))) + if (unlikely(hpage_collapse_test_exit_or_disable(mm))) { + vma =3D NULL; goto breakouterloop; + } =20 VM_BUG_ON(khugepaged_scan.address < hstart || khugepaged_scan.address + HPAGE_PMD_SIZE > @@ -2470,8 +2473,10 @@ static unsigned int khugepaged_scan_mm_slot(unsigned= int pages, int *result, fput(file); if (*result =3D=3D SCAN_PTE_MAPPED_HUGEPAGE) { mmap_read_lock(mm); - if (hpage_collapse_test_exit_or_disable(mm)) + if (hpage_collapse_test_exit_or_disable(mm)) { + vma =3D NULL; goto breakouterloop; + } *result =3D collapse_pte_mapped_thp(mm, khugepaged_scan.address, false); if (*result =3D=3D SCAN_PMD_MAPPED) --=20 2.51.0