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Wed, 7 Apr 2021 03:06:08 +0000 From: yanfei.xu@windriver.com To: shy828301@gmail.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 2/2] mm: khugepaged: check MMF_DISABLE_THP ahead of iterating over vmas Date: Wed, 7 Apr 2021 11:05:48 +0800 Message-Id: <20210407030548.189104-3-yanfei.xu@windriver.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20210407030548.189104-1-yanfei.xu@windriver.com> References: <20210407030548.189104-1-yanfei.xu@windriver.com> Content-Type: text/plain X-Originating-IP: [60.247.85.82] X-ClientProxiedBy: HK0PR03CA0104.apcprd03.prod.outlook.com (2603:1096:203:b0::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 HK0PR03CA0104.apcprd03.prod.outlook.com (2603:1096:203:b0::20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.4020.16 via Frontend Transport; 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identity=mailfrom; envelope-from=""; helo=NAM12-DM6-obe.outbound.protection.outlook.com; client-ip=40.107.243.75 X-HE-DKIM-Result: pass/pass X-HE-Tag: 1617764768-427294 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. Signed-off-by: Yanfei Xu --- mm/khugepaged.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mm/khugepaged.c b/mm/khugepaged.c index a6012b9259a2..f4ad25a7db55 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; if (likely(!khugepaged_test_exit(mm))) vma =3D find_vma(mm, khugepaged_scan.address); =20 --=20 2.27.0