From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id E1D86CA0EDC for ; Thu, 14 Aug 2025 08:30:08 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 7E4E590010F; Thu, 14 Aug 2025 04:30:08 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 79588900088; Thu, 14 Aug 2025 04:30:08 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6D2B290010F; Thu, 14 Aug 2025 04:30:08 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id 5654F900088 for ; Thu, 14 Aug 2025 04:30:08 -0400 (EDT) Received: from smtpin09.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay06.hostedemail.com (Postfix) with ESMTP id 2791D117976 for ; Thu, 14 Aug 2025 08:30:08 +0000 (UTC) X-FDA: 83774690496.09.944008B Received: from baidu.com (mx24.baidu.com [111.206.215.185]) by imf30.hostedemail.com (Postfix) with ESMTP id 4D2F38000B for ; Thu, 14 Aug 2025 08:30:04 +0000 (UTC) Authentication-Results: imf30.hostedemail.com; dkim=none; dmarc=pass (policy=quarantine) header.from=baidu.com; spf=pass (imf30.hostedemail.com: domain of lirongqing@baidu.com designates 111.206.215.185 as permitted sender) smtp.mailfrom=lirongqing@baidu.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1755160206; a=rsa-sha256; cv=none; b=P0lDJDvjq2ie8wTQRYONSaFkMyaWaE7rzXaIwyi0GeETBD7DtB0UiCSF55JeXbav4oAG1K NTuKcojmgVuNEoYQISeHoDNA4x80CxOCF/pROQ4fm97JDoo3fZbOgZrWsGpvFekuVx44iC f1ogufcQKyO5XUZE28G6OFlJX0CRli0= ARC-Authentication-Results: i=1; imf30.hostedemail.com; dkim=none; dmarc=pass (policy=quarantine) header.from=baidu.com; spf=pass (imf30.hostedemail.com: domain of lirongqing@baidu.com designates 111.206.215.185 as permitted sender) smtp.mailfrom=lirongqing@baidu.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1755160206; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding:in-reply-to: references; bh=bwnhjEkjxcCo498CxFtdgm0mALdZDkTRxk0wTgi/laQ=; b=HIudLE+33aPs39Srjq8a+t23G7q28KekNKHY5+zaCoFGilJYpWvG3MZU2UoiKtuMPIrNXV +lM8p9CXOIXeb4ehEzjK6SF4C75CfzH8kGK2P/j5AIUqs/NWKkQQNkVeb6bBEctqz0LINm lR5A20Vro4LfmBISuVBozCLO0CX+llE= From: lirongqing To: , , , , , CC: Li RongQing Subject: [PATCH] mm/hugetlb: early exit from hugetlb_pages_alloc_boot() when max_huge_pages=0 Date: Thu, 14 Aug 2025 16:29:50 +0800 Message-ID: <20250814082950.2888-1-lirongqing@baidu.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.127.73.8] X-ClientProxiedBy: bjkjy-exc8.internal.baidu.com (172.31.50.52) To bjkjy-exc3.internal.baidu.com (172.31.50.47) X-FEAS-Client-IP: 172.31.50.47 X-FE-Policy-ID: 52:10:53:SYSTEM X-Rspamd-Server: rspam03 X-Rspam-User: X-Rspamd-Queue-Id: 4D2F38000B X-Stat-Signature: 5n8rxyrc15hpbzjhcrqwhyury7grytoz X-HE-Tag: 1755160204-715723 X-HE-Meta: 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000007, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Li RongQing Optimize hugetlb_pages_alloc_boot() to return immediately when max_huge_pages is 0, saving cycles when hugepages aren't configured in the kernel command line. Signed-off-by: Li RongQing --- mm/hugetlb.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 753f99b..514fab5 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -3654,6 +3654,9 @@ static void __init hugetlb_hstate_alloc_pages(struct hstate *h) return; } + if (!h->max_huge_pages) + return; + /* do node specific alloc */ if (hugetlb_hstate_alloc_pages_specific_nodes(h)) return; -- 2.9.4