From mboxrd@z Thu Jan 1 00:00:00 1970 From: majianpeng Subject: About RAID1/10 io barrier between normal io and resync/recovery io. Date: Thu, 1 Nov 2012 15:58:04 +0800 Message-ID: <2012110115580062797811@gmail.com> Reply-To: majianpeng Mime-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 Return-path: Sender: linux-raid-owner@vger.kernel.org To: NeilBrown Cc: linux-raid List-Id: linux-raid.ids SGkgTmVpbDoNCglBdCBwcmVzZW50LCB0aGVyZSBhcmUgYmFycmllcnMgaW4gcmFpZDEvMTAuQWJv dXQgYmFycmllcix5b3UgZGVzY3JpYmVkOgkiU29tZXRpbWVzIHdlIG5lZWQgdG8gc3VzcGVuZCBJ TyB3aGlsZSB3ZSBkbyBzb21ldGhpbmcgZWxzZSwgIGVpdGhlciBzb21lIHJlc3luYy9yZWNvdmVy eSwgb3IgcmVjb25maWd1cmUgdGhlIGFycmF5Ig0KICAgU28gd2hlbiBkbyBub3JtYWwgcmVxdWVz dCBpbiBmdW5jIG1ha2VfcmVxdWVzdCwgaXQgY2FsbCB3YWl0X2JhcnJpZXIuQW5kIGluIHN5bmNf cmVxdWVzdCBpdCBjYWxsIHJhaXNlX2JhcnJpZXIuDQpPZiBjb3Vyc2UsdGhlcmUgYXJlIHNvbWUg cGxhY2UgdG8gY2FsbCByYWlzZV9iYXJyaWVyIHRvIGRvIG90aGVyIHRoaW5ncy4NCkJ1dCB0aGVy ZSwgaSBvbmx5IHdhbnRlZCB0byB0YWxrIGFib3V0IG5vcm1hbCBpbyBhbmQgcmVzeW5jL3JlY292 ZXJ5Lg0KDQoxOkkgdGhpbmsgeW91IGFkZCBpbyBiYXJyaWVyIGlzIGJlY2F1c2UgcmFpZDEvMTAg ZGlkbid0IHN0cmlwZSBsaWtlIHJhaWQ0NTYuU28gaXQgb25seSBmb3IgdGhlIHNpdHVhdGlvbiB3 aGljaCBub3JtYWwgaW8gYW5kIHN5bmMgaW8gaGFkIHNhbWUgY29udGVudC4gSXMgdGhhdCByaWdo dD8NCjI6IElmIG5vcm1hbCBpb3Mgb3V0c2lkZSB0aGUgcmVzeW5jL3JlY292ZXJ5IHdpbmRvdywg aSB0aGluayB0aGVyZSBpcyBubyBuZWNlc3NhcnkgdG8gdXNlIGlvIGJhcnJpZXIuDQpJIHdhbnRl ZCB0byBmaW5kIHRoZSByZWFzb24gYnkgcmV2aWV3aW5nIHRoZSBnaXQgbG9nLkJ1dCBhdCBwcmVz ZW50LCBnaXQgbG9nIG9mIGtlcm5lbCBpcyBvbmx5IGFmdGVyIGtlcm5lbCAyLjYuMTIuDQpTbyBp IGxvb2tlZCBpbnRvIHRoZSBjb2RlIGFib3V0IGtlcm5lbCAyLjQuQW5kIGZvdW5kIHNvbWV0aGlu ZyBsaWtlIGkgdGhvdWdodC4gVGhlcmUgd2VyZSByZXN5bmMgd2luZG93Lg0KQnV0IHdoeSBkaWQg eW91IHJlbW92ZSBvciBtb2RpZnkgPw0KMzogSSB0aGluayB1c2luZyByZXN5bmMgd2luZG93IHRv IGNvbnRyb2wgbm9ybWFsIGlvIGlzIHBlcmZlY3QgYnV0IGNvbXBsaWNhdGVkLlNvIGkgb25seSB1 c2VkIG9uZSBwb3NpdG9uIHdoaWNoIGJlZm9yZSBtZGRldi0+Y3Vycl9yZXN5bmNfY29tcGxldGVk Lg0KVGhlIGNvZGUgaXM6DQpkaWZmIC0tZ2l0IGEvZHJpdmVycy9tZC9yYWlkMS5jIGIvZHJpdmVy cy9tZC9yYWlkMS5jDQppbmRleCA4MDM0ZmJkLi5jNDVhNzY5IDEwMDY0NA0KLS0tIGEvZHJpdmVy cy9tZC9yYWlkMS5jDQorKysgYi9kcml2ZXJzL21kL3JhaWQxLmMNCkBAIC0yMzQsNiArMjM0LDcg QEAgc3RhdGljIHZvaWQgY2FsbF9iaW9fZW5kaW8oc3RydWN0IHIxYmlvICpyMV9iaW8pDQogew0K ICAgICAgICBzdHJ1Y3QgYmlvICpiaW8gPSByMV9iaW8tPm1hc3Rlcl9iaW87DQogICAgICAgIGlu dCBkb25lOw0KKyAgICAgICBpbnQgc2tpcF9iYXJyaWVyID0gdGVzdF9iaXQoUjFCSU9fU0tJUF9C QVJSSUVSLCAmcjFfYmlvLT5zdGF0ZSk7DQogICAgICAgIHN0cnVjdCByMWNvbmYgKmNvbmYgPSBy MV9iaW8tPm1kZGV2LT5wcml2YXRlOw0KIA0KICAgICAgICBpZiAoYmlvLT5iaV9waHlzX3NlZ21l bnRzKSB7DQpAQCAtMjUzLDcgKzI1NCw4IEBAIHN0YXRpYyB2b2lkIGNhbGxfYmlvX2VuZGlvKHN0 cnVjdCByMWJpbyAqcjFfYmlvKQ0KICAgICAgICAgICAgICAgICAqIFdha2UgdXAgYW55IHBvc3Np YmxlIHJlc3luYyB0aHJlYWQgdGhhdCB3YWl0cyBmb3IgdGhlIGRldmljZQ0KICAgICAgICAgICAg ICAgICAqIHRvIGdvIGlkbGUuDQogICAgICAgICAgICAgICAgICovDQotICAgICAgICAgICAgICAg YWxsb3dfYmFycmllcihjb25mKTsNCisgICAgICAgICAgICAgICBpZiAoIXNraXBfYmFycmllcikN CisgICAgICAgICAgICAgICAgICAgICAgIGFsbG93X2JhcnJpZXIoY29uZik7DQogICAgICAgIH0N CiB9DQogDQpAQCAtMTAwNyw2ICsxMDA5LDcgQEAgc3RhdGljIHZvaWQgbWFrZV9yZXF1ZXN0KHN0 cnVjdCBtZGRldiAqbWRkZXYsIHN0cnVjdCBiaW8gKiBiaW8pDQogICAgICAgIGludCBmaXJzdF9j bG9uZTsNCiAgICAgICAgaW50IHNlY3RvcnNfaGFuZGxlZDsNCiAgICAgICAgaW50IG1heF9zZWN0 b3JzOw0KKyAgICAgICBpbnQgc2tpcF9iYXJyaWVyID0gMDsNCiANCiAgICAgICAgLyoNCiAgICAg ICAgICogUmVnaXN0ZXIgdGhlIG5ldyByZXF1ZXN0IGFuZCB3YWl0IGlmIHRoZSByZWNvbnN0cnVj dGlvbg0KQEAgLTEwMzYsNyArMTAzOSwxMyBAQCBzdGF0aWMgdm9pZCBtYWtlX3JlcXVlc3Qoc3Ry dWN0IG1kZGV2ICptZGRldiwgc3RydWN0IGJpbyAqIGJpbykNCiAgICAgICAgICAgICAgICBmaW5p c2hfd2FpdCgmY29uZi0+d2FpdF9iYXJyaWVyLCAmdyk7DQogICAgICAgIH0NCiANCi0gICAgICAg d2FpdF9iYXJyaWVyKGNvbmYpOw0KKyAgICAgICBpZiAodGVzdF9iaXQoTURfUkVDT1ZFUllfUlVO TklORywgJm1kZGV2LT5yZWNvdmVyeSkgJiYNCisgICAgICAgICAgICAgICAoYmlvLT5iaV9zZWN0 b3IgKyBiaW8tPmJpX3NpemUvNTEyIDw9IA0KKyAgICAgICAgICAgICAgICBtZGRldi0+Y3Vycl9y ZXN5bmNfY29tcGxldGVkKSkNCisgICAgICAgICAgICAgICBza2lwX2JhcnJpZXIgPSAxOw0KKw0K KyAgICAgICBpZiAoIXNraXBfYmFycmllcikNCisgICAgICAgICAgICAgICB3YWl0X2JhcnJpZXIo Y29uZik7DQogDQogICAgICAgIGJpdG1hcCA9IG1kZGV2LT5iaXRtYXA7DQogDQpAQCAtMTA1Myw2 ICsxMDYyLDggQEAgc3RhdGljIHZvaWQgbWFrZV9yZXF1ZXN0KHN0cnVjdCBtZGRldiAqbWRkZXYs IHN0cnVjdCBiaW8gKiBiaW8pDQogICAgICAgIHIxX2Jpby0+bWRkZXYgPSBtZGRldjsNCiAgICAg ICAgcjFfYmlvLT5zZWN0b3IgPSBiaW8tPmJpX3NlY3RvcjsNCiANCisgICAgICAgaWYgKHNraXBf YmFycmllcikNCisgICAgICAgICAgICAgICBzZXRfYml0KFIxQklPX1NLSVBfQkFSUklFUiwgJnIx X2Jpby0+c3RhdGUpOw0KICAgICAgICAvKiBXZSBtaWdodCBuZWVkIHRvIGlzc3VlIG11bHRpcGxl IHJlYWRzIHRvIGRpZmZlcmVudA0KICAgICAgICAgKiBkZXZpY2VzIGlmIHRoZXJlIGFyZSBiYWQg YmxvY2tzIGFyb3VuZCwgc28gd2Uga2VlcA0KICAgICAgICAgKiB0cmFjayBvZiB0aGUgbnVtYmVy IG9mIHJlYWRzIGluIGJpby0+YmlfcGh5c19zZWdtZW50cy4NCkBAIC0xMjI5LDEwICsxMjQwLDE1 IEBAIHJlYWRfYWdhaW46DQogICAgICAgICAgICAgICAgZm9yIChqID0gMDsgaiA8IGk7IGorKykN CiAgICAgICAgICAgICAgICAgICAgICAgIGlmIChyMV9iaW8tPmJpb3Nbal0pDQogICAgICAgICAg ICAgICAgICAgICAgICAgICAgICAgIHJkZXZfZGVjX3BlbmRpbmcoY29uZi0+bWlycm9yc1tqXS5y ZGV2LCBtZGRldik7DQotICAgICAgICAgICAgICAgcjFfYmlvLT5zdGF0ZSA9IDA7DQotICAgICAg ICAgICAgICAgYWxsb3dfYmFycmllcihjb25mKTsNCisgICAgICAgICAgICAgICBpZiAoIXNraXBf YmFycmllcikNCisgICAgICAgICAgICAgICAgICAgICAgIHIxX2Jpby0+c3RhdGUgPSAwOw0KKyAg ICAgICAgICAgICAgIGVsc2UNCisgICAgICAgICAgICAgICAgICAgICAgIHNldF9iaXQoUjFCSU9f U0tJUF9CQVJSSUVSLCAmcjFfYmlvLT5zdGF0ZSk7DQorICAgICAgICAgICAgICAgaWYgKCFza2lw X2JhcnJpZXIpDQorICAgICAgICAgICAgICAgICAgICAgICBhbGxvd19iYXJyaWVyKGNvbmYpOw0K ICAgICAgICAgICAgICAgIG1kX3dhaXRfZm9yX2Jsb2NrZWRfcmRldihibG9ja2VkX3JkZXYsIG1k ZGV2KTsNCi0gICAgICAgICAgICAgICB3YWl0X2JhcnJpZXIoY29uZik7DQorICAgICAgICAgICAg ICAgaWYgKCFza2lwX2JhcnJpZXIpDQorICAgICAgICAgICAgICAgICAgICAgICB3YWl0X2JhcnJp ZXIoY29uZik7DQogICAgICAgICAgICAgICAgZ290byByZXRyeV93cml0ZTsNCiAgICAgICAgfQ0K IA0KZGlmZiAtLWdpdCBhL2RyaXZlcnMvbWQvcmFpZDEuaCBiL2RyaXZlcnMvbWQvcmFpZDEuaA0K aW5kZXggMGZmMzcxNS4uZmFiOWZkYSAxMDA2NDQNCi0tLSBhL2RyaXZlcnMvbWQvcmFpZDEuaA0K KysrIGIvZHJpdmVycy9tZC9yYWlkMS5oDQpAQCAtMTU4LDYgKzE1OCw4IEBAIHN0cnVjdCByMWJp byB7DQogI2RlZmluZSAgICAgICAgUjFCSU9fTWFkZUdvb2QgNw0KICNkZWZpbmUgICAgICAgIFIx QklPX1dyaXRlRXJyb3IgOA0KIA0KKyNkZWZpbmUgUjFCSU9fU0tJUF9CQVJSSUVSIDkNCisNCiBl eHRlcm4gaW50IG1kX3JhaWQxX2Nvbmdlc3RlZChzdHJ1Y3QgbWRkZXYgKm1kZGV2LCBpbnQgYml0 cyk7DQogDQogI2VuZGlmDQoNCkF0IHByZXNlbnQsIHRoZSBjb2RlIG9ubHkgZm9yIG5vcm1hbCBp byBhbmQgc3luYyBpby5CdXQgZXRjIHN0b3AvcmVtb3ZlIGRpc2sgL2FkZCBkaXNrL2ZpeF9yZWFk X2Vycm9yIGFsc28gdXNlZCBpbyBiYXJyaWVyLg0KSSB1c2VkIGZpbyB0byB0ZXN0Lg0KVGhlIGZp byBzY3JpcHQgaXM6DQpbZ2xvYmFsXQ0KZmlsZW5hbWU9L2Rldi9tZDANCmRpcmVjdD0xDQpicz01 MTJLDQoNClt3cml0ZV0NCnJ3PXdyaXRlDQpydW50aW1lPTYwMA0KDQpbcmVhZF0NCnN0b25ld2Fs bA0Kcnc9cmVhZA0KcnVudGltZT02MDANCg0KSSBmaXJzdGx5IHN0YXJ0ZWQgcmVzeW5jL3JlY292 ZXJ5IGZvciBzb21lIHRpbWVzIGluIG9yZGVyIHRvIG5vcm1hbCBpbyBwb3NpdGlvbiBpcyBiZWZv cmUgY3Vycl9yZXN5bmNfY29tcGxldGVkLg0KQW5kIGkgYWxzbyBrZWVwIHRoZSByZXN5bmMvcmVj b3Zlcnkgc3BlZWQgaXMgYWJvdXQgMzBNQi9zIHRocm91Z2h0IHN5c19zcGVlZF9taW4uDQpUaGUg cmVzdWx0IGlzOg0Kdy8gYWJvdmUgY29kZToNCgl3cml0ZSAgcmVjb3ZlcnkvcmVzeW5jIDMwTUIv UzsgZmlvIDcwTUIvcw0KCXJlYWQgICByZWNvdmVyeS9yZXN5bmMgMzBNQi9zOyAgZmlvIDkwTUIv cw0KDQp3L28gYWJvdmUgY29kZToNCgl3cml0ZSByZWNvdmVyeS9yZXN5bmMgMzBNQi9zOyBmaW8g MjlNQi9zDQogICAgcmVhZCAgcmVjb3ZlcnkvcmVzeW5jICAzME1CL3M7IGZpbyAgMzFNQi9zDQoN ClRoZSByZXN1bHQgaXMgcmVtYXJrYWJsZS4NCg0KDQpKaWFucGVuZw==