From mboxrd@z Thu Jan 1 00:00:00 1970 From: majianpeng Subject: Re: Re: [PATCH 1/2] fs/block-dev.c:fix performance regression in O_DIRECT writes to md block devices. Date: Mon, 16 Jul 2012 13:30:46 +0800 Message-ID: <201207161330389538280@gmail.com> References: <201207160930466402203@gmail.com>, <20120716152116.725e5db6@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 Cc: viro , linux-raid , linux-fsdevel , axboe To: "Neil Brown" Return-path: Sender: linux-raid-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org T24gMjAxMi0wNy0xNiAxMzoyMSBOZWlsQnJvd24gPG5laWxiQHN1c2UuZGU+IFdyb3RlOg0KPk9u IE1vbiwgMTYgSnVsIDIwMTIgMDk6MzA6NTAgKzA4MDAgbWFqaWFucGVuZyA8bWFqaWFucGVuZ0Bn bWFpbC5jb20+IHdyb3RlOg0KPg0KPj4gRm9yIHJlZ3VsYXIgZmlsZSwgd3JpdGUgb3BlcmFpb24g dXNlZCBibGtfcGx1ZyBmdW5jdGlvbi5CdXQgZm9yIGJsb2NrDQo+PiBmaWxlLHdyaXRlIG9wZXJh dGlvbiBkaWQgbm90IHVzZSBibGtfcGx1Zy4NCj4+IA0KPj4gU2lnbmVkLW9mZi1ieTogSmlhbnBl bmcgTWEgPG1hamlhbnBlbmdAZ21haWwuY29tPg0KPj4gLS0tDQo+PiAgZnMvYmxvY2tfZGV2LmMg fCAgICA3ICsrKysrKy0NCj4+ICAxIGZpbGVzIGNoYW5nZWQsIDYgaW5zZXJ0aW9ucygrKSwgMSBk ZWxldGlvbnMoLSkNCj4+IA0KPj4gZGlmZiAtLWdpdCBhL2ZzL2Jsb2NrX2Rldi5jIGIvZnMvYmxv Y2tfZGV2LmMNCj4+IGluZGV4IGMyYmJlMWYuLjIyY2Q0MzYgMTAwNjQ0DQo+PiAtLS0gYS9mcy9i bG9ja19kZXYuYw0KPj4gKysrIGIvZnMvYmxvY2tfZGV2LmMNCj4+IEBAIC0yMTUsOSArMjE1LDE0 IEBAIGJsa2Rldl9kaXJlY3RfSU8oaW50IHJ3LCBzdHJ1Y3Qga2lvY2IgKmlvY2IsIGNvbnN0IHN0 cnVjdCBpb3ZlYyAqaW92LA0KPj4gIHsNCj4+ICAJc3RydWN0IGZpbGUgKmZpbGUgPSBpb2NiLT5r aV9maWxwOw0KPj4gIAlzdHJ1Y3QgaW5vZGUgKmlub2RlID0gZmlsZS0+Zl9tYXBwaW5nLT5ob3N0 Ow0KPj4gKwlzdHJ1Y3QgYmxrX3BsdWcgcGx1ZzsNCj4+ICsJc3NpemVfdCByZXQ7DQo+PiAgDQo+ PiAtCXJldHVybiBfX2Jsb2NrZGV2X2RpcmVjdF9JTyhydywgaW9jYiwgaW5vZGUsIElfQkRFVihp bm9kZSksIGlvdiwgb2Zmc2V0LA0KPj4gKwlibGtfc3RhcnRfcGx1ZygmcGx1Zyk7DQo+PiArCXJl dCA9ICBfX2Jsb2NrZGV2X2RpcmVjdF9JTyhydywgaW9jYiwgaW5vZGUsIElfQkRFVihpbm9kZSks IGlvdiwgb2Zmc2V0LA0KPj4gIAkJCQkgICAgbnJfc2VncywgYmxrZGV2X2dldF9ibG9ja3MsIE5V TEwsIE5VTEwsIDApOw0KPj4gKwlibGtfZmluaXNoX3BsdWcoJnBsdWcpOw0KPj4gKwlyZXR1cm4g cmV0Ow0KPj4gIH0NCj4+ICANCj4+ICBpbnQgX19zeW5jX2Jsb2NrZGV2KHN0cnVjdCBibG9ja19k ZXZpY2UgKmJkZXYsIGludCB3YWl0KQ0KPg0KPltjYzppbmcgSmVucyBBeGJvZV0NCj4NCj5JIHRo aW5rIHdlIGRvIG5lZWQgc29tZXRoaW5nIGxpa2UgdGhpcywgYnV0IEkgZG9uJ3QgdGhpbmsgdGhp cyBpcyB0aGUgcmlnaHQNCj5wbGFjZSBmb3IgaXQuDQo+DQo+Rm9yIG5vcm1hbCBmaWxlc3lzdGVt IHdyaXRlcywgdGhlIGJsa197c3RhcnQsZmluaXNofV9wbHVnIGNhbGxzIGFyZSBpbg0KPmdlbmVy aWNfZmlsZV9haW9fd3JpdGUgd2hpY2ggaXMgdGhlICJhaW9fd3JpdGUiIGZ1bmN0aW9uLCBvciBp cyBjYWxsZWQgYnkgaXQuDQo+YWlvX3dyaXRlIGNhbGxzIGdlbmVyaWNfZmlsZV9haW9fd3JpdGUs IGNhbGxzIGJsa19zdGFydF9wbHVnLCBjYWxsDQo+X19nZW5lcmljX2ZpbGVfYWlvX3dyaXRlLg0K Pg0KPkZvciBibG9jayBkZXZpY2VzIHdlIGJ5cGFzcyB0aGUgZ2VuZXJpY19maWxlX2Fpb193cml0 ZToNCj4NCj5haW9fd3JpdGUgY2FsbHMgYmxrZGV2X2Fpb193cml0ZSBjYWxscyBfX2dlbmVyaWNf ZmlsZV9haW9fd3JpdGUgLSB3aXRob3V0DQo+Y2FsbGluZyBibGtfc3RhcnRfcGx1Zy4NCj5TbyBJ IHRoaW5rIHRoZSBjYWxscyB0byBibGtfc3RhcnRfcGx1ZyBhbmQgYmxrX2ZpbmlzaF9wbHVnIHNo b3VsZCBnbyBpbg0KPmJsa2Rldl9haW9fd3JpdGUuICBpLmUuIGJsa2Rldl9haW9fd3JpdGUgc2hv dWxkIGJlIG1hZGUgdG8gbG9vayBtb3JlIGxpa2UNCj5nZW5lcmljX2ZpbGVfYWlvX3dyaXRlIChq dXN0IHdpdGhvdXQgdGhlIG11dGV4X2xvY2svdW5sb2NrKS4NCj4NCj5JZiB5b3UgcmVkbyB0aGUg cGF0Y2ggbGlrZSB0aGF0IGFuZCB0ZXN0IGl0IEknbGwgaGFwcGlseSBhZGQgbXkgUmV2aWV3ZWQt YnkuDQo+DQo+SSBzdXNwZWN0IGl0IHNob3VsZCBiZSBtZXJnZWQgdGhyb3VnaCBKZW5zJyB0cmVl Lg0KPg0KPlRoYW5rcywNCj5OZWlsQnJvd24NCj4NCj4NClRoYW5rcywgaSdsbCBkbyBpdCBhbmQg cmVzZW5kIHRoZSBwYXRjaC4=