From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Jianpeng Ma" Subject: Re: Re: [PATCH] raid5: Avoid doing more read on dev of a stripe at the same time Date: Fri, 21 Sep 2012 10:24:45 +0800 Message-ID: <201209211024418590971@gmail.com> References: <2012091510203206229010@gmail.com> <20120920125144.0ed69ec3@notabene.brown> <201209201104415460652@gmail.com>, <20120920132422.0f7841f1@notabene.brown> Mime-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 Return-path: Sender: linux-raid-owner@vger.kernel.org To: Neil Brown Cc: linux-raid List-Id: linux-raid.ids T24gMjAxMi0wOS0yMCAxMToyNCBOZWlsQnJvd24gPG5laWxiQHN1c2UuZGU+IFdyb3RlOg0KPk9u IFRodSwgMjAgU2VwIDIwMTIgMTE6MDQ6NDYgKzA4MDAgIkppYW5wZW5nIE1hIiA8bWFqaWFucGVu Z0BnbWFpbC5jb20+IHdyb3RlOg0KPg0KPj4gT24gMjAxMi0wOS0yMCAxMDo1MSBOZWlsQnJvd24g PG5laWxiQHN1c2UuZGU+IFdyb3RlOg0KPj4gPk9uIFNhdCwgMTUgU2VwIDIwMTIgMTA6MjA6MzUg KzA4MDAgIkppYW5wZW5nIE1hIiA8bWFqaWFucGVuZ0BnbWFpbC5jb20+IHdyb3RlOg0KPj4gPg0K Pj4gPj4gSW4gZnVuYyAnb3BzX3J1bl9iaW8nIGlmIHlvdSByZWFkIHRoZSBkZXYgd2hpY2ggdGhl IGxhc3QgcmVhZGluZw0KPj4gPj4gb2YgdGhpcyBkZXYgZGlkbid0IHJldHVybixpdCB3aWxsIGRl c3Ryb3J5IHRoZSAgcmVxL3JyZXEnc291cmNlIG9mIHJkZXYuDQo+PiA+PiBJdCBtYXkgY2FsbCBo dW5nLXRhc2suDQo+PiA+PiBGb3IgZXhhbXBsZSwgZm9yIGJhZHNlY3RvciBvciBvdGhlciByZWFz b25zLCByZWFkLW9wZXJhdGlvbiBvbmx5IHVzZWQNCj4+ID4+IHN0cmlwZSBpbnN0ZWFkIG9mIGNo dW5rX2FsaWduZWRfcmVhZC4NCj4+ID4+IEZpcnN0OnN0cmlwZSAwO3NlY29uZDogc3RyaXBlIDg7 dGhpcmQ6c3RyaXBlIDE2LkF0IHRoZSBibG9jay1sYXllcix0aHJlZQ0KPj4gPj4gYmlvcyBtZXJn ZWQuDQo+PiA+PiBCZWNhdXNlIG1lZGlhIGVycm9yIG9mIHNlY3RvciBmcm9tIDAgdG8gNywgdGhl IHJlcXVlc3QgcmV0cmllZC4NCj4+ID4+IEF0IHRoaXMgdGltZSwgcmFpZDVkIHJlYWRlZCBzdHJp cGUwIGFnYWluLkJ1dCBpdCB3aWxsIHNldCAnYmlvLT5uZXh0ID0NCj4+ID4+IE5VTEwnLlNvIHRo ZSBzdHJpcGUgOCBhbmQgMTYgZGlkbid0IHJldHVybi4NCj4+ID4+IA0KPj4gPj4gU2lnbmVkLW9m Zi1ieTogSmlhbnBlbmcgTWEgPG1hamlhbnBlbmdAZ21haWwuY29tPg0KPj4gPg0KPj4gPkhpLA0K Pj4gPiBJJ20gcmVhbGx5IHRyeWluZywgYnV0IEkgY2Fubm90IHVuZGVyc3RhbmQgd2hhdCB5b3Ug YXJlIHNheWluZy4NCj4+ID4NCj4+IFNvcnJ5IGZvciBteSBiYWQgZW5nbGlzaC4NCj4+ID5JIHRo aW5rIHRoZSBzaXR1YXRpb24gdGhhdCB5b3UgYXJlIGRlc2NyaWJpbmcgaW52b2x2ZXMgYSAyNCBz ZWN0b3IgcmVxdWVzdC4NCj4+ID5UaGlzIGlzIGF0dGFjaGVkIHRvIDMgc3RyaXBlX2hlYWRzIC0g OCBzZWN0b3JzIGVhY2ggLSBhdCBhZGRyZXNzIDAsIDgsIDE2Lg0KPj4gPg0KPj4gPlNvICd0b3Jl YWQnIG9uIHRoZSBmaXJzdCBkZXZpY2Ugb2YgZWFjaCBzdHJpcGUgcG9pbnRzIHRvIHRoaXMgYmlv LCBhbmQNCj4+ID5iaV9uZXh0IGlzIE5VTEwuDQo+PiA+DQo+PiA+VGhlICJyZXEiIGJpbyBmb3Ig ZWFjaCBkZXZpY2UgaXMgZmlsbGVkIG91dCB0byByZWFkIG9uZSBwYWdlIGFuZCB0aGVzZSB0aHJl ZQ0KPj4gPidyZXEnIGJpb3MgYXJlIHN1Ym1pdHRlZC4gIFRoZSBibG9jayBsYXllciBtZXJnZXMg dGhlc2UgaW50byBhIHNpbmdsZSByZXF1ZXN0Lg0KPj4gPg0KPj4gPlRoaXMgcmVxdWVzdCByZXBv cnRzIGFuIGVycm9yIGJlY2F1c2UgdGhlcmUgaXMgYSByZWFkIGVycm9yIHNvbWV3aGVyZSBpbiB0 aGUNCj4+ID5maXJzdCAgOCBzZWN0b3JzLg0KPj4gPg0KPj4gWWVzLA0KPj4gPlNvIG9uZSwgb3Ig bWF5YmUgYWxsLCBvZiB0aGUgJ3JlcScgYmlvcyByZXR1cm4gd2l0aCBhbiBlcnJvcj8NCj4+IEZy b20gbXkgdGVzdCwgd2hlbiByZXEgZGlkIG5vdCByZXR1cm4gYW5kIGF0IHRoZSBzYW1lIHRpbWUs IHRoZSBiaW8oc3RyaXBlIDApIHNlbmQuDQo+PiBTbyB0aGlzIG9wZXJhdGlvbiB3aWxsIHNldCBi aV9uZXh0IGlzIE5VTEwuDQo+DQo+QXJlIHlvdSBzYXlpbmcgdGhhdCB3ZSBzZW5kIGFub3RoZXIg YmlvIGJlZm9yZSB0aGUgZmlyc3Qgb25lIGhhcyByZXR1cm5lZD8NCj5UaGF0IHNob3VsZG4ndCBi ZSBwb3NzaWJsZSBhcyBzaC0+Y291bnQgd2lsbCBwcmV2ZW50IGl0IGZyb20gaGFwcGVuaW5nLg0K PldoaWxlIHRoZXJlIGlzIGFuIG91dHN0YW5kaW5nIHJlcXVlc3QsIHNoLT5jb3VudCB3aWxsIGJl ID4wLCBhbmQgdW50aWwNCj5zaC0+Y291bnQgaXMgMCwgd2Ugd29uJ3QgdHJ5IHRvIHNlbmQgYW55 IG1vcmUgcmVxdWVzdHMuDQo+DQo+U28gSSBzdGlsbCBkb24ndCB1bmRlcnN0YW5kLiAgUGxlYXNl IHRyeSB0byBwcm92aWRlIGFzIG11Y2ggZGV0YWlsIGFzDQo+cG9zc2libGUuICBJZiBpdCBpcyBl YXNpZXIsIHdyaXRlIGluIHlvdXIgb3duIGxhbmd1YWdlIGFuZCB1c2UNCj50cmFuc2xhdGUuZ29v Z2xlLmNvbSB0byBjb252ZXJ0IHRvIGVuZ2xpc2guID8/DQo+DQo+VGhhbmtzLA0KPk5laWxCcm93 bg0KDQpIaSwNCiBpIHdyb3RlIGEgc2hlbGwtc2NyaXB0IGNhbiByZXByb2R1Y3QgdGhpcyBidWcu DQpOb3RlOiBtZGFkbSAtVg0KbWRhZG0gLSB2My4zLXByZSAtIFVucmVsZWFzZWQNCg0KDQojIS9i aW4vYmFzaA0KDQpkZWNsYXJlIC1pIGNvdW50DQpkZWNsYXJlIC1pIHNlY3Rvcg0KY291bnQ9MA0K c2VjdG9yPTIwNDgNCndoaWxlIHRydWUNCmRvDQoJaGRwYXJtIC0tbWFrZS1iYWQtc2VjdG9yICRz ZWN0b3IgLS15ZXMtaS1rbm93LXdoYXQtaS1hbS1kb2luZyAvZGV2L3NkYyA+IC9kZXYvbnVsbA0K CWhkcGFybSAtLW1ha2UtYmFkLXNlY3RvciAkc2VjdG9yIC0teWVzLWkta25vdy13aGF0LWktYW0t ZG9pbmcgL2Rldi9zZGQgPiAvZGV2L251bGwNCgloZHBhcm0gLS1tYWtlLWJhZC1zZWN0b3IgJHNl Y3RvciAtLXllcy1pLWtub3ctd2hhdC1pLWFtLWRvaW5nIC9kZXYvc2RlID4gL2Rldi9udWxsDQoJ bGV0IGNvdW50KysNCglsZXQgc2VjdG9yKz0kY291bnQqOA0KCWlmICgoJGNvdW50ID09IDQwKSk7 dGhlbg0KCQlicmVhaw0KCWZpDQpkb25lDQoNCndoaWxlIHRydWUNCmRvDQoJbWRhZG0gLVMgL2Rl di9tZDANCgltZGFkbSAtQ1IgL2Rldi9tZDAgLWw1IC1jNCAtbjQgbWlzc2luZyAvZGV2L3NkW2Nk ZV0NCglkZCBpZj0vZGV2L21kMCBvZj0vZGV2L251bGwgYnM9MTBNIGNvdW50PTEgaWZsYWc9ZGly ZWN0DQoJc2xlZXAgMQ0KZG9uZQ0KDQoNClRoYW5rcw==