From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Weijie Yang" Subject: [bug report] read-ahead can't work properly Date: Mon, 24 Jun 2019 21:30:10 +0800 (CST) Message-ID: <37a8bb5a.af8b.16b89adff5d.Coremail.weijieut@163.com> Mime-Version: 1.0 Content-Type: text/plain; charset=GBK Content-Transfer-Encoding: base64 Return-path: Sender: linux-kernel-owner@vger.kernel.org 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" List-Id: linux-api@vger.kernel.org CldoZW4gdHJ5IHRoZSBmaWxlIHJlYWRhaGVhZCBieSBwb3NpeF9mYWR2aXNlKCksIEkgZmluZCBp dCBjYW4ndCB3b3JrIHByb3Blcmx5LgoKRm9yIGV4YW1wbGUsIHBvc2l4X2ZhZHZpc2UoUE9TSVhf RkFEVl9XSUxMTkVFRCkgYSAxME1CIGZpbGUsIHRoZSBrZXJuZWwKYWN0dWFsbHkgIHJlYWRhaGVh ZCBvbmx5IDUxMktCIGRhdGEgdG8gdGhlIHBhZ2UgY2FjaGUsIGV2ZW4gaWYgdGhlcmUgYXJlIGVu b3VnaApmcmVlIG1lbW9yeSBpbiB0aGUgbWFjaGluZS4KCldoZW4gdHJhY2UgdG8ga2VybmVsLCBJ IGZpbmQgdGhlIGlzc3VlIGlzIGF0IGZvcmNlX3BhZ2VfY2FjaGVfcmVhZGFoZWFkKCk6CiAKICAg ICAgICBtYXhfcGFnZXMgPSBtYXhfdCh1bnNpZ25lZCBsb25nLCBiZGktPmlvX3BhZ2VzLCByYS0+ cmFfcGFnZXMpOwogICAgICAgIG5yX3RvX3JlYWQgPSBtaW4obnJfdG9fcmVhZCwgbWF4X3BhZ2Vz KTsKCk5vIG1hdGVyIHdoYXQgaW5wdXQgbnJfdG9fcmVhZCBpcywgaXQgaXMgbGltaXRlZCB0byBh IHZlcnkgc21hbGwgc2l6ZSwgc3VjaCBhcyAxMjggcGFnZXMuCgpJIHRoaW5rIHRoZSBtaW4oKSBs aW1pdCBjb2RlIGlzIHRvIGxpbWl0IHBlci1kaXNrLWlvIHNpemUsIG5vdCB0aGUgdG90YWwgbnJf dG9fcmVhZC4KYW5kIHRyYWNlIHRoZSBnaXQgbG9nLCB0aGlzIGlzc3VlIGlzIGludHJvZHVjZWQg YnkgNmQyYmU5MTVlNTg5CmFmdGVyIHRoYXQsIG5yX3RvX3JlYWQgaXMgbGltaXRlZCBhdCBzbWFs bCwgZXZlbiBpZiB0aGVyZSBhcmUgZW5vdWdoIGZyZWUgbWVtb3J5LgpiZWZvcmUgdGhhdCwgdXNl ciBjYW4gcmVhZGFoZWFkIGEgdmVyeSBsYXJnZSBmaWxlIGlmIHRoZXkgaGF2ZSBlbm91Z2ggbWVt b3J5LgoKV2hlbiByZWFkIHRoZSBwb3NpeF9mYWR2aXNlKCkgbWFuLXBhZ2UsIGl0IHNheXMgcmVh ZGFoZWFkIGRhdGEgZGVwZW5kaW5nIG9uCnZpcnR1YWwgbWVtb3J5IGxvYWQuIApTbyBpZiB0aGVy ZSBhcmUgZW5vdWdoIG1lbW9yeSwgaXQgc2hvdWxkIHJlYWQgYXMgbWFueSBkYXRhIGFzIHVzZXIg ZXhwZWN0ZWQuCgpFeHBlY3Qgc29tZW9uZSBjYW4gY2xhcmlmeSBvci9hbmQgZml4IGl0LiAKClRo YW5rcyAKCgoKCg==