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Sat, 10 Jan 2026 12:18:08 +0800 (CST) Received: from dggpemf100008.china.huawei.com (unknown [7.185.36.138]) by mail.maildlp.com (Postfix) with ESMTPS id 78D4B4056C; Sat, 10 Jan 2026 12:21:26 +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; Sat, 10 Jan 2026 12:21:25 +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 3/3] mm: hugetlb_cma: optimize hugetlb_cma_alloc_frozen_folio() Date: Sat, 10 Jan 2026 12:21:11 +0800 Message-ID: <20260110042111.1541894-4-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20260110042111.1541894-1-wangkefeng.wang@huawei.com> References: <20260110042111.1541894-1-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: kwepems100001.china.huawei.com (7.221.188.238) To dggpemf100008.china.huawei.com (7.185.36.138) X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 919A7100003 X-Stat-Signature: e1jzqskhqinszm5qcs9zo34cwwy364o5 X-Rspam-User: X-HE-Tag: 1768018890-149704 X-HE-Meta: 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 bpQ5ARdg LyA2HXJrPt2xFEG0AjeRwDm/nMWkcRpHHkWY4ZmJtwQIsmk3oFpXGr7hbr0rEonW46Q9euJNqPESRHubeGGB04vY3hutcJ2aXC7MElKReG3i0+Cu3uyboSi/xcbfuB0MhM/UqyTppayHdsh6aA7cG3MwD+RhKhcfAWJdWJ3k5igGNYRpJUupK9h1H50rPQiE7+RUU1uVyWw+DaBTiXZ43LNMQzSKAXu5oTRVPXpR+4zhZHIu05h8JPDK5Ea0gPkrrwFj7qkcTy3V/DzOpm/aw6x4Mm8ImQnUo92rmuBaiGE0wXiwe+ZYzngPko0AD7gZym8j0qP4p7wHccMrGSKUBP91nYNaclBBnFtjc90jwe1xUsi0= 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