From mboxrd@z Thu Jan 1 00:00:00 1970 From: majianpeng Subject: Re: Re: [PATCH 1/2 V1] [PATCH] fs/block-dev.c:fix performance regression in O_DIRECT writes to md block devices Date: Thu, 2 Aug 2012 14:48:41 +0800 Message-ID: <201208021448392819731@gmail.com> References: <201207161422001403795@gmail.com>, <20120717130434.670e51e9@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 Cc: viro , linux-raid , linux-fsdevel , "Neil Brown" To: "Jens Axboe" Return-path: Sender: linux-raid-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org T24gMjAxMi0wNy0xNyAxMTowNCBOZWlsQnJvd24gPG5laWxiQHN1c2UuZGU+IFdyb3RlOg0KPk9u IE1vbiwgMTYgSnVsIDIwMTIgMTQ6MjI6MDMgKzA4MDAgbWFqaWFucGVuZyA8bWFqaWFucGVuZ0Bn bWFpbC5jb20+IHdyb3RlOg0KPg0KPj4gRm9yIHJlZ3VsYXIgZmlsZSwgd3JpdGUgb3BlcmFpb24g dXNlZCBibGtfcGx1ZyBmdW5jdGlvbi5CdXQgZm9yIGJsb2NrDQo+PiBmaWxlLHdyaXRlIG9wZXJh dGlvbiBkaWQgbm90IHVzZSBibGtfcGx1Zy4NCj4+IFRoaXMgcGF0Y2ggaXMgYWxzbyBmb3Igd3Jp dGUtY2FjaGUgbW9kZSBmb3IgYmxvY2stZGV2aWNlLg0KPj4gDQo+PiBTaWduZWQtb2ZmLWJ5OiBK aWFucGVuZyBNYSA8bWFqaWFucGVuZ0BnbWFpbC5jb20+DQo+DQo+UmV2aWV3ZWQtYnk6IE5laWxC cm93biA8bmVpbGJAc3VzZS5kZT4NCj4NCj5XaWxsIHlvdSB0YWtlIHRoaXMgSmVucz8gIFRob3Vn aCBtYWlsIHRvIHlvdSBzZWVtIHRvIGJlIGJvdW5jaW5nOg0KPg0KPjxheGJvZUBmdXNpb25pby5j b20+OiBob3N0IG1haWwuZnVzaW9uaW8uY29tWzEwLjEwMS4xLjE5XSBzYWlkOiA1NTQgNS40LjYg SG9wDQo+ICAgIGNvdW50IGV4Y2VlZGVkIC0gcG9zc2libGUgbWFpbCBsb29wIChpbiByZXBseSB0 byBlbmQgb2YgREFUQSBjb21tYW5kKQ0KPg0KPnNvIEknbSBub3Qgc3VyZSB5b3UnbGwgZXZlbiBz ZWUgdGhpcyA6LSgNCj4NCj5OZWlsQnJvd24NCj4NCj4+IC0tLQ0KPj4gIGZzL2Jsb2NrX2Rldi5j IHwgICAgMyArKysNCj4+ICAxIGZpbGVzIGNoYW5nZWQsIDMgaW5zZXJ0aW9ucygrKSwgMCBkZWxl dGlvbnMoLSkNCj4+IA0KPj4gZGlmZiAtLWdpdCBhL2ZzL2Jsb2NrX2Rldi5jIGIvZnMvYmxvY2tf ZGV2LmMNCj4+IGluZGV4IGMyYmJlMWYuLmNmMTA3NzggMTAwNjQ0DQo+PiAtLS0gYS9mcy9ibG9j a19kZXYuYw0KPj4gKysrIGIvZnMvYmxvY2tfZGV2LmMNCj4+IEBAIC0xNTc5LDkgKzE1NzksMTEg QEAgc3NpemVfdCBibGtkZXZfYWlvX3dyaXRlKHN0cnVjdCBraW9jYiAqaW9jYiwgY29uc3Qgc3Ry dWN0IGlvdmVjICppb3YsDQo+PiAgew0KPj4gIAlzdHJ1Y3QgZmlsZSAqZmlsZSA9IGlvY2ItPmtp X2ZpbHA7DQo+PiAgCXNzaXplX3QgcmV0Ow0KPj4gKwlzdHJ1Y3QgYmxrX3BsdWcgcGx1ZzsNCj4+ ICANCj4+ICAJQlVHX09OKGlvY2ItPmtpX3BvcyAhPSBwb3MpOw0KPj4gIA0KPj4gKwlibGtfc3Rh cnRfcGx1ZygmcGx1Zyk7DQo+PiAgCXJldCA9IF9fZ2VuZXJpY19maWxlX2Fpb193cml0ZShpb2Ni LCBpb3YsIG5yX3NlZ3MsICZpb2NiLT5raV9wb3MpOw0KPj4gIAlpZiAocmV0ID4gMCB8fCByZXQg PT0gLUVJT0NCUVVFVUVEKSB7DQo+PiAgCQlzc2l6ZV90IGVycjsNCj4+IEBAIC0xNTkwLDYgKzE1 OTIsNyBAQCBzc2l6ZV90IGJsa2Rldl9haW9fd3JpdGUoc3RydWN0IGtpb2NiICppb2NiLCBjb25z dCBzdHJ1Y3QgaW92ZWMgKmlvdiwNCj4+ICAJCWlmIChlcnIgPCAwICYmIHJldCA+IDApDQo+PiAg CQkJcmV0ID0gZXJyOw0KPj4gIAl9DQo+PiArCWJsa19maW5pc2hfcGx1ZygmcGx1Zyk7DQo+PiAg CXJldHVybiByZXQ7DQo+PiAgfQ0KPj4gIEVYUE9SVF9TWU1CT0xfR1BMKGJsa2Rldl9haW9fd3Jp dGUpOw0KPg0KPg0KDQpIb3cgYWJvdXQgdGhpcyBwYXRjaD8gYXBwbHkgb3IgcmVqZWN0PyBUaGFu a3Mh