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[220.181.13.129]) by mx.google.com with ESMTP id d65si6554729oib.140.2019.06.24.06.32.56 for ; Mon, 24 Jun 2019 06:32:58 -0700 (PDT) Received-SPF: pass (google.com: domain of weijieut@163.com designates 220.181.13.129 as permitted sender) client-ip=220.181.13.129; Authentication-Results: mx.google.com; dkim=neutral (body hash did not verify) header.i=@163.com header.s=s110527 header.b="mQly/kqz"; spf=pass (google.com: domain of weijieut@163.com designates 220.181.13.129 as permitted sender) smtp.mailfrom=weijieut@163.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=163.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=163.com; s=s110527; h=Date:From:Subject:MIME-Version:Message-ID; bh=aUGKt vZSy+6o0S9PVtKxbkzfcp42LXfJggJvKQBcobw=; b=mQly/kqzO1oiR3doEt8hS ppAyTx2uccPH4rQaW6E2hG79FGTcWdoLaP4/usBjKU2gFnZ6g0P1Qr5yI5bZGeqw nMLcNJNkKT9jAvWPUFg2jPFPiJ2mlOTez343k0d5uFJ+Tnw2Sd7t8QRdjMDgLSQz ZOuiDhAZpZrNIfxQpY2au4= Received: from weijieut$163.com ( [121.237.48.209] ) by ajax-webmail-wmsvr129 (Coremail) ; Mon, 24 Jun 2019 21:30:10 +0800 (CST) X-Originating-IP: [121.237.48.209] Date: Mon, 24 Jun 2019 21:30:10 +0800 (CST) From: "Weijie Yang" To: linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: axboe@fb.com, fengguang.wu@intel.com, linux-api@vger.kernel.org, "weijie.yang@samsung.com" Subject: [bug report] read-ahead can't work properly X-Priority: 3 X-Mailer: Coremail Webmail Server Version SP_ntes V3.5 build 20190614(cb3344cf) Copyright (c) 2002-2019 www.mailtech.cn 163com Content-Transfer-Encoding: base64 Content-Type: text/plain; charset=GBK MIME-Version: 1.0 Message-ID: <37a8bb5a.af8b.16b89adff5d.Coremail.weijieut@163.com> X-Coremail-Locale: zh_CN X-CM-TRANSID:gcGowADXbfJi0BBdeBX+AA--.3677W X-CM-SenderInfo: xzhlyxxhxwqiywtou0bp/xtbBDQLdsFaD5oP5fAAAsX X-Coremail-Antispam: 1U5529EdanIXcx71UUUUU7vcSsGvfC2KfnxnUU== X-Bogosity: Ham, tests=bogofilter, spamicity=0.011776, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: CldoZW4gdHJ5IHRoZSBmaWxlIHJlYWRhaGVhZCBieSBwb3NpeF9mYWR2aXNlKCksIEkgZmluZCBp dCBjYW4ndCB3b3JrIHByb3Blcmx5LgoKRm9yIGV4YW1wbGUsIHBvc2l4X2ZhZHZpc2UoUE9TSVhf RkFEVl9XSUxMTkVFRCkgYSAxME1CIGZpbGUsIHRoZSBrZXJuZWwKYWN0dWFsbHkgIHJlYWRhaGVh ZCBvbmx5IDUxMktCIGRhdGEgdG8gdGhlIHBhZ2UgY2FjaGUsIGV2ZW4gaWYgdGhlcmUgYXJlIGVu b3VnaApmcmVlIG1lbW9yeSBpbiB0aGUgbWFjaGluZS4KCldoZW4gdHJhY2UgdG8ga2VybmVsLCBJ IGZpbmQgdGhlIGlzc3VlIGlzIGF0IGZvcmNlX3BhZ2VfY2FjaGVfcmVhZGFoZWFkKCk6CiAKICAg ICAgICBtYXhfcGFnZXMgPSBtYXhfdCh1bnNpZ25lZCBsb25nLCBiZGktPmlvX3BhZ2VzLCByYS0+ cmFfcGFnZXMpOwogICAgICAgIG5yX3RvX3JlYWQgPSBtaW4obnJfdG9fcmVhZCwgbWF4X3BhZ2Vz KTsKCk5vIG1hdGVyIHdoYXQgaW5wdXQgbnJfdG9fcmVhZCBpcywgaXQgaXMgbGltaXRlZCB0byBh IHZlcnkgc21hbGwgc2l6ZSwgc3VjaCBhcyAxMjggcGFnZXMuCgpJIHRoaW5rIHRoZSBtaW4oKSBs aW1pdCBjb2RlIGlzIHRvIGxpbWl0IHBlci1kaXNrLWlvIHNpemUsIG5vdCB0aGUgdG90YWwgbnJf dG9fcmVhZC4KYW5kIHRyYWNlIHRoZSBnaXQgbG9nLCB0aGlzIGlzc3VlIGlzIGludHJvZHVjZWQg YnkgNmQyYmU5MTVlNTg5CmFmdGVyIHRoYXQsIG5yX3RvX3JlYWQgaXMgbGltaXRlZCBhdCBzbWFs bCwgZXZlbiBpZiB0aGVyZSBhcmUgZW5vdWdoIGZyZWUgbWVtb3J5LgpiZWZvcmUgdGhhdCwgdXNl ciBjYW4gcmVhZGFoZWFkIGEgdmVyeSBsYXJnZSBmaWxlIGlmIHRoZXkgaGF2ZSBlbm91Z2ggbWVt b3J5LgoKV2hlbiByZWFkIHRoZSBwb3NpeF9mYWR2aXNlKCkgbWFuLXBhZ2UsIGl0IHNheXMgcmVh ZGFoZWFkIGRhdGEgZGVwZW5kaW5nIG9uCnZpcnR1YWwgbWVtb3J5IGxvYWQuIApTbyBpZiB0aGVy ZSBhcmUgZW5vdWdoIG1lbW9yeSwgaXQgc2hvdWxkIHJlYWQgYXMgbWFueSBkYXRhIGFzIHVzZXIg ZXhwZWN0ZWQuCgpFeHBlY3Qgc29tZW9uZSBjYW4gY2xhcmlmeSBvci9hbmQgZml4IGl0LiAKClRo YW5rcyAKCgoKCg==