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 X-Spam-Level: X-Spam-Status: No, score=-0.3 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6300AC43613 for ; Mon, 24 Jun 2019 13:48:20 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2ED432133F for ; Mon, 24 Jun 2019 13:48:20 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=163.com header.i=@163.com header.b="mQly/kqz" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731326AbfFXNsT (ORCPT ); Mon, 24 Jun 2019 09:48:19 -0400 Received: from m13-129.163.com ([220.181.13.129]:16837 "EHLO m13-129.163.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726505AbfFXNsS (ORCPT ); Mon, 24 Jun 2019 09:48:18 -0400 X-Greylist: delayed 916 seconds by postgrey-1.27 at vger.kernel.org; Mon, 24 Jun 2019 09:48:17 EDT 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== Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org CldoZW4gdHJ5IHRoZSBmaWxlIHJlYWRhaGVhZCBieSBwb3NpeF9mYWR2aXNlKCksIEkgZmluZCBp dCBjYW4ndCB3b3JrIHByb3Blcmx5LgoKRm9yIGV4YW1wbGUsIHBvc2l4X2ZhZHZpc2UoUE9TSVhf RkFEVl9XSUxMTkVFRCkgYSAxME1CIGZpbGUsIHRoZSBrZXJuZWwKYWN0dWFsbHkgIHJlYWRhaGVh ZCBvbmx5IDUxMktCIGRhdGEgdG8gdGhlIHBhZ2UgY2FjaGUsIGV2ZW4gaWYgdGhlcmUgYXJlIGVu b3VnaApmcmVlIG1lbW9yeSBpbiB0aGUgbWFjaGluZS4KCldoZW4gdHJhY2UgdG8ga2VybmVsLCBJ IGZpbmQgdGhlIGlzc3VlIGlzIGF0IGZvcmNlX3BhZ2VfY2FjaGVfcmVhZGFoZWFkKCk6CiAKICAg ICAgICBtYXhfcGFnZXMgPSBtYXhfdCh1bnNpZ25lZCBsb25nLCBiZGktPmlvX3BhZ2VzLCByYS0+ cmFfcGFnZXMpOwogICAgICAgIG5yX3RvX3JlYWQgPSBtaW4obnJfdG9fcmVhZCwgbWF4X3BhZ2Vz KTsKCk5vIG1hdGVyIHdoYXQgaW5wdXQgbnJfdG9fcmVhZCBpcywgaXQgaXMgbGltaXRlZCB0byBh IHZlcnkgc21hbGwgc2l6ZSwgc3VjaCBhcyAxMjggcGFnZXMuCgpJIHRoaW5rIHRoZSBtaW4oKSBs aW1pdCBjb2RlIGlzIHRvIGxpbWl0IHBlci1kaXNrLWlvIHNpemUsIG5vdCB0aGUgdG90YWwgbnJf dG9fcmVhZC4KYW5kIHRyYWNlIHRoZSBnaXQgbG9nLCB0aGlzIGlzc3VlIGlzIGludHJvZHVjZWQg YnkgNmQyYmU5MTVlNTg5CmFmdGVyIHRoYXQsIG5yX3RvX3JlYWQgaXMgbGltaXRlZCBhdCBzbWFs bCwgZXZlbiBpZiB0aGVyZSBhcmUgZW5vdWdoIGZyZWUgbWVtb3J5LgpiZWZvcmUgdGhhdCwgdXNl ciBjYW4gcmVhZGFoZWFkIGEgdmVyeSBsYXJnZSBmaWxlIGlmIHRoZXkgaGF2ZSBlbm91Z2ggbWVt b3J5LgoKV2hlbiByZWFkIHRoZSBwb3NpeF9mYWR2aXNlKCkgbWFuLXBhZ2UsIGl0IHNheXMgcmVh ZGFoZWFkIGRhdGEgZGVwZW5kaW5nIG9uCnZpcnR1YWwgbWVtb3J5IGxvYWQuIApTbyBpZiB0aGVy ZSBhcmUgZW5vdWdoIG1lbW9yeSwgaXQgc2hvdWxkIHJlYWQgYXMgbWFueSBkYXRhIGFzIHVzZXIg ZXhwZWN0ZWQuCgpFeHBlY3Qgc29tZW9uZSBjYW4gY2xhcmlmeSBvci9hbmQgZml4IGl0LiAKClRo YW5rcyAKCgoKCg==