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Howlett" , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Matthew Brost , Joshua Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple Subject: [PATCH mm-unstable v1 1/3] mm/ksm: export ksm_is_running() to check KSM merge state Date: Tue, 9 Jun 2026 05:46:13 -0600 Message-ID: <20260609114619.144416-2-npache@redhat.com> In-Reply-To: <20260609114619.144416-1-npache@redhat.com> References: <20260609114619.144416-1-npache@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 X-Mimecast-MFC-PROC-ID: kFsPI0qdN5Tw_wR-wZnWo-soqJs876qBCkFIkQzAQGc_1781005558 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit content-type: text/plain; charset="US-ASCII"; x-default=true X-Rspamd-Queue-Id: 085D9140004 X-Stat-Signature: gzxyin3y3rrwwqaqndjgjhfdedkfzfzb X-Rspamd-Server: rspam03 X-Rspam-User: X-HE-Tag: 1781005562-260723 X-HE-Meta: U2FsdGVkX1/wM0IJqq8PE55REGoOZh0XhxgPSqz6v/c4HBv9910v9GLV14OhvdELn2yYVcOI2zlHFxw5NZWTDZhHLsAO9CL7TEkVS0QfbM2evktXPcUO8/2lhWFaiTiZiPEay88DWGxtWpLVtxZCTrcsOBY9BZIE/Z1ZnRNkMbbv5JXYInhc+ytBqAAQ+1FEptEO0iLTUZuBjvyDmw72rvmnYUyGLaExyXzZ4yv+yJH++LJZAcsJ6XIHd+NoFD+i5GiBugaxFAuw4xY37aDXcaUcchnH968eUFoXBSulP40N2JLitfWz2U6aAl5bYAS+ZHSAuq0HLvU5fVxYTkewudmZMf2RXWU4ds6f/dYfmIJcfV4BasjgEIdaCFiYYFQVkk4+XiI6JFWhmrqRLnD8M5va/lC++vqu71QBmtrHReiDLTWqHcSVgTdM4L5HpCAgWaxmfTu6tAoECoeTN3NIvofo7xi/gd1MGtzTP6v1oE2GPXU3piDzM7PqBESqpeoPCmMUf7mbDbuxVxFhIiic9juteWHAGc19F3fzs7H1qSDzFrpCs3uMOnGYLaCf2ssLDVz7KSJA/pgZCO++MVNNMk3OmB699qAOS+2lQlmlIX6IZbimE7zDZThkQrMn27zbFGVjsiiRy9GrUn7wCneuqG6VEbhbdkV8oKtFawr0dyitu1jg5/GgJx/EFEKN85eNsfpiSBHCXlQntp6jq/G2TB0rCotYC055atpa1V9FnM9DqW9rd0URg3gOd+OtCkgNQc8tFf9cQn+HQTwzCpm5qD0YBVIjzuJ5FOsze3ORA3TpHwqUcd9kyTe2TlTs6BRGzRQsVscK/b/nTR6QRCbuZ6em+WD739iN3o1gQKXE2fBGx8yBfnAbSaAyU7Rg2qw37cohiCyBG798Z99kZ0J7fX91VItAT/MP9/4E1vKWg0l+48JZ7iIRsUuftbc3SaxyKengG05Ci/elb6QNWI/ DMGc5H59 0q+bfuqgKxK/00d3Px53J8L54c1OtT8c45OS8t9B7rKg+IcTv+2tIJxCRAPGP9lW/Tn1z9eUizLiCnXz2Q12qncpoGEBGEVj/9OU20KMUbM7TREYL3xjDirvUayvotFj/5FBFSKSimzcv7Z6/FWWGx/KlUNhFlR+u8CYvYjweacsH2MSZz2MdleogatFHCm4sHJlSnCDPk2RUbnb5VYYhACxXmps5B7oWDxfWDFbVgXZI4y5xavnw67cCVbzBFXhX+PehWA1oR9avDtMHmertNMjdfqkRDYE4Dnfia41s5pbTtOYtKYKYmo8er3d2OUNzQjvQmosgaOnkuFcWiYgK8hFzBNXzThp1mhtTFhv6wkokvN45wIHtR9o3Kqkx6we3LzWAu5Ctxq1njKns47IFUn9GrOjFSxYxPznuPIqPLA5KC3vF9dnXcw4uxBj5OsEXrcO4BgPoQ+4Cqyb5etwezN2Gyw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add ksm_is_running() which returns true when KSM is actively merging (ksm_run & KSM_RUN_MERGE). This will be used by try_to_map_unused_to_zeropage() to skip zero-page remapping in VM_MERGEABLE VMAs when KSM is active. Signed-off-by: Nico Pache --- include/linux/ksm.h | 6 ++++++ mm/ksm.c | 6 ++++++ 2 files changed, 12 insertions(+) diff --git a/include/linux/ksm.h b/include/linux/ksm.h index d39d0d5483a2..c1048b690a92 100644 --- a/include/linux/ksm.h +++ b/include/linux/ksm.h @@ -17,6 +17,7 @@ #ifdef CONFIG_KSM int ksm_madvise(struct vm_area_struct *vma, unsigned long start, unsigned long end, int advice, vm_flags_t *vm_flags); +bool ksm_is_running(void); vma_flags_t ksm_vma_flags(struct mm_struct *mm, const struct file *file, vma_flags_t vma_flags); int ksm_enable_merge_any(struct mm_struct *mm); @@ -144,6 +145,11 @@ static inline int ksm_madvise(struct vm_area_struct *vma, unsigned long start, return 0; } +static inline bool ksm_is_running(void) +{ + return false; +} + static inline struct folio *ksm_might_need_to_copy(struct folio *folio, struct vm_area_struct *vma, unsigned long addr) { diff --git a/mm/ksm.c b/mm/ksm.c index 7d5b76478f0b..edc2b961ff59 100644 --- a/mm/ksm.c +++ b/mm/ksm.c @@ -3015,6 +3015,12 @@ int ksm_madvise(struct vm_area_struct *vma, unsigned long start, } EXPORT_SYMBOL_GPL(ksm_madvise); +bool ksm_is_running(void) +{ + return ksm_run & KSM_RUN_MERGE; +} +EXPORT_SYMBOL_GPL(ksm_is_running); + int __ksm_enter(struct mm_struct *mm) { struct ksm_mm_slot *mm_slot; -- 2.54.0