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Mon, 12 Jan 2026 23:07:04 +0800 (CST) Received: from dggpemf100008.china.huawei.com (unknown [7.185.36.138]) by mail.maildlp.com (Postfix) with ESMTPS id A01872016A; Mon, 12 Jan 2026 23:10:24 +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; Mon, 12 Jan 2026 23:10:23 +0800 From: Kefeng Wang To: Andrew Morton , David Hildenbrand , Oscar Salvador , Muchun Song , CC: , , Zi Yan , Vlastimil Babka , Brendan Jackman , Johannes Weiner , Matthew Wilcox , Kefeng Wang Subject: [PATCH 4/5] mm: hugetlb_cma: optimize hugetlb_cma_alloc_frozen_folio() Date: Mon, 12 Jan 2026 23:09:53 +0800 Message-ID: <20260112150954.1802953-5-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20260112150954.1802953-1-wangkefeng.wang@huawei.com> References: <20260112150954.1802953-1-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: kwepems100002.china.huawei.com (7.221.188.206) To dggpemf100008.china.huawei.com (7.185.36.138) X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: A34164000A X-Rspam-User: X-Stat-Signature: f3gyd6xt73474ksr6r9ws81ep64yzjtr X-HE-Tag: 1768230627-122861 X-HE-Meta: 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 IiIQnQ2m 3YOx0QWQjEgU4QTfLUvI4OFzxxPHztAAVF6Qpj2qdCQOiosdtSc97c6Xrft13DSgRBUNrGZ1kLtEIWFddIfgmvaI9ccRXse8hwP0XxWvGf9pN6QSqwwwWMJSoV70BR/k92LYTw412J83xI4brVAirYzsOGFZc0UW7VM2JrH64MbOWZWEIF4bSYc/N0Lf8lpLLgjkvmj7w8lrpQsNSvUjMOcSb46HndCJbG0syzqZtUrvUnC8+GSnKGBE8B/rOWCUGwajljL2ALJS9AAuM0RhFm/wRxNNVIGtm02cKnYmetds8g6oP+LUz5hX13xOR7zzvIFo8nrxLvjfUYIkhU2YgI/SxOcVld+pbUa6ncQ8k6BfRjiZ1bgKssRRLgqOXLTBFoU26H0Onqvb+4SFnqc88KRtMkzfVL3b+TexwX6T2DMkrrZTnoHDl2KZnTEfmGyCWhSeqjcD9izsD/7A= 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: Check hugetlb_cma_size which helps to avoid unnecessary gfp check or nodemask traversal. Signed-off-by: Kefeng Wang --- mm/hugetlb_cma.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mm/hugetlb_cma.c b/mm/hugetlb_cma.c index 0ddf9755c090..d8fa93825992 100644 --- a/mm/hugetlb_cma.c +++ b/mm/hugetlb_cma.c @@ -16,7 +16,7 @@ static struct cma *hugetlb_cma[MAX_NUMNODES]; static unsigned long hugetlb_cma_size_in_node[MAX_NUMNODES] __initdata; static bool hugetlb_cma_only; -static unsigned long hugetlb_cma_size __initdata; +static unsigned long hugetlb_cma_size __ro_after_init; void hugetlb_cma_free_frozen_folio(struct folio *folio) { @@ -31,6 +31,9 @@ struct folio *hugetlb_cma_alloc_frozen_folio(int order, gfp_t gfp_mask, struct folio *folio; struct page *page = NULL; + if (!hugetlb_cma_size) + return NULL; + if (hugetlb_cma[nid]) page = cma_alloc_frozen_compound(hugetlb_cma[nid], order); -- 2.27.0