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Sun, 4 Apr 2021 15:33:25 +0000 From: yanfei.xu@windriver.com To: linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH 2/2] mm: khugepaged: check MMF_DISABLE_THP ahead of iterating over vmas Date: Sun, 4 Apr 2021 23:33:11 +0800 Message-Id: <20210404153311.1460106-3-yanfei.xu@windriver.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210404153311.1460106-1-yanfei.xu@windriver.com> References: <20210404153311.1460106-1-yanfei.xu@windriver.com> Content-Type: text/plain X-Originating-IP: [60.247.85.82] X-ClientProxiedBy: HK2PR02CA0136.apcprd02.prod.outlook.com (2603:1096:202:16::20) To BY5PR11MB4241.namprd11.prod.outlook.com (2603:10b6:a03:1ca::13) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from pek-lpggp1.wrs.com (60.247.85.82) by HK2PR02CA0136.apcprd02.prod.outlook.com (2603:1096:202:16::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3999.26 via Frontend Transport; Sun, 4 Apr 2021 15:33:24 +0000 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 62a77ed0-487b-42f5-9d3c-08d8f77efd01 X-MS-TrafficTypeDiagnostic: BY5PR11MB4181: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:4502; 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identity=mailfrom; envelope-from=""; helo=NAM10-DM6-obe.outbound.protection.outlook.com; client-ip=40.107.93.43 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1617550409-122542 Content-Transfer-Encoding: quoted-printable 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: From: Yanfei Xu We could check MMF_DISABLE_THP ahead of iterating over all of vma. Otherwise if some mm_struct contain a large number of vma, there will be amounts meaningless cpu cycles cost. BTW, drop an unnecessary cond_resched(), because there is a another cond_resched() followed it and no consumed invocation between them. Signed-off-by: Yanfei Xu --- mm/khugepaged.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index 2efe1d0c92ed..c293ec4a94ea 100644 --- a/mm/khugepaged.c +++ b/mm/khugepaged.c @@ -2094,6 +2094,8 @@ static unsigned int khugepaged_scan_mm_slot(unsigne= d int pages, */ if (unlikely(!mmap_read_trylock(mm))) goto breakouterloop_mmap_lock; + if (test_bit(MMF_DISABLE_THP, &mm->flags)) + goto breakouterloop_mmap_lock; if (likely(!khugepaged_test_exit(mm))) vma =3D find_vma(mm, khugepaged_scan.address); =20 @@ -2101,7 +2103,6 @@ static unsigned int khugepaged_scan_mm_slot(unsigne= d int pages, for (; vma; vma =3D vma->vm_next) { unsigned long hstart, hend; =20 - cond_resched(); if (unlikely(khugepaged_test_exit(mm))) { progress++; break; --=20 2.27.0