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Tue, 14 Oct 2025 19:33:43 +0800 (CST) Received: from dggpemf100008.china.huawei.com (unknown [7.185.36.138]) by mail.maildlp.com (Postfix) with ESMTPS id 267301400CB; Tue, 14 Oct 2025 19:34:03 +0800 (CST) Received: from localhost.localdomain (10.50.87.83) by dggpemf100008.china.huawei.com (7.185.36.138) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.11; Tue, 14 Oct 2025 19:34:02 +0800 From: Kefeng Wang To: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , CC: Zi Yan , Baolin Wang , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , , Kefeng Wang , Sidhartha Kumar Subject: [PATCH v2 1/3] mm: mprotect: always skip dma pinned folio in prot_numa_skip() Date: Tue, 14 Oct 2025 19:33:47 +0800 Message-ID: <20251014113349.2618158-2-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20251014113349.2618158-1-wangkefeng.wang@huawei.com> References: <20251014113349.2618158-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [10.50.87.83] X-ClientProxiedBy: kwepems200002.china.huawei.com (7.221.188.68) To dggpemf100008.china.huawei.com (7.185.36.138) X-Stat-Signature: corj7kw7ucmhyw7icaxxpoekkzwz7oww X-Rspamd-Queue-Id: D67E314000A X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1760441647-252696 X-HE-Meta: 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 y8dLmP7e wvAy3GOAIZIRvLQavYl5oReVGtAc/5BgEUqlekdGTfWVUOM3nm0lI88dVHf//q55FuoPM5tHhSM3gftilCUTmaJtXguZQJo5u9lFUtgZ5HihOUtmKxFeMdg3/PuZLE3FcrftlX2Nc8vXmeqt93JxuiTT6c5j77dWbplxJIZps+UGMTctpMddpQW4jEr3NtyElqg0pqZ12iYHJ1K9N4ymTX+dsqUorIC1d5aDGKqTuOThEFXBAH8iapzz0gsrlGx9AzHwyZhVa+CmTusTr1alfgj00oD0D/5DYO1mISEkWhnq3tK6rI0k5ir/YPPUONZO2iObMBj2rVNPjCISODxlbQbwKharvFOIqrixJpZRrEejxOMgiHzYnc4EzvjChKlNzDRoJ X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: If the folio(even not CoW folio) is dma pinned, it can't be migrated, so always skip pinned folio to avoid a waste of cycles when folios migration. Reviewed-by: Sidhartha Kumar Acked-by: David Hildenbrand Reviewed-by: Lance Yang Signed-off-by: Kefeng Wang --- mm/mprotect.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/mm/mprotect.c b/mm/mprotect.c index 113b48985834..bb59a42809b8 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -136,9 +136,12 @@ static bool prot_numa_skip(struct vm_area_struct *vma, unsigned long addr, if (folio_is_zone_device(folio) || folio_test_ksm(folio)) goto skip; - /* Also skip shared copy-on-write pages */ - if (is_cow_mapping(vma->vm_flags) && - (folio_maybe_dma_pinned(folio) || folio_maybe_mapped_shared(folio))) + /* Also skip shared copy-on-write folios */ + if (is_cow_mapping(vma->vm_flags) && folio_maybe_mapped_shared(folio)) + goto skip; + + /* Folios are pinned and can't be migrated */ + if (folio_maybe_dma_pinned(folio)) goto skip; /* -- 2.27.0