From mboxrd@z Thu Jan 1 00:00:00 1970 From: majianpeng Subject: Re: Re: [PATCH 0/2] Improve odirect-write performance for block-device. Date: Mon, 16 Jul 2012 13:43:13 +0800 Message-ID: <201207161343099841872@gmail.com> References: <201207160929453906032@gmail.com>, Mime-Version: 1.0 Content-Type: text/plain; charset="gb2312" Content-Transfer-Encoding: base64 Cc: "Neil Brown" , viro , linux-raid , linux-fsdevel To: shli Return-path: Sender: linux-raid-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org T24gMjAxMi0wNy0xNiAxMToyOSBTaGFvaHVhIExpIDxzaGxpQGtlcm5lbC5vcmc+IFdyb3RlOg0K PjIwMTIvNy8xNSBtYWppYW5wZW5nIDxtYWppYW5wZW5nQGdtYWlsLmNvbT46DQo+PiBDcmVhdGUg YSByYWlkNSB1c2luZyBmb3VyIGRpc2sgYW5kIHRoZSBjaHVua3NpemUgaXMgNTEySy4NCj4+IFRl c3QgY29tbWFuZCBpczogZGQgaWY9L2Rldi96ZXJvIG9mPS9kZXYvbWQwIGJzPTE1MzZLIGNvdW50 PTkwMDAwIG9mbGFnPWRpcmVjdA0KPj4NCj4+IEluIFJIRUw2KGtlcm5lbCAyLjYuMzIpOnNwZWVk IGFib3V0IDI0ME1CL3MNCj4+IEluIDMuNS4wLXJjNTpzcGVlZCBhYm91dCA3N01CL1MNCj4+IEFk ZCB0d28gcGF0Y2ggaW4gMy41LjAtcmM1LCBzcGVlZCBhYm91dCAyMDBNQi9TLg0KPj4NCj4+IFNv IHRoZSBwZXJmb3JtYW5jZSBvZiBvZGlyZWN0LXdyaXJ0ZSBmb3IgYmxvY2stZGVpdmNlIHdhcyBv YnZpb3VzIHJlZHVjZWQuDQo+PiBQQVRDSCAxLzI6IEFkZCBibGtfcGx1ZyBmdW5jdGlvbiBmb3Ig b2RpcmVjdC13cml0ZSBibG9jay1kZXZpY2UNCj4+IFBBVENIIDIvMjogUmVtb3ZlIFJFUV9TWU5D IGZvciBvZGlyZWN0LXdyaXRlIGluIHJhaWQ0NTYuDQo+Pg0KPj4gUEFUQ0ggMi8yIG1heWJlIG5v dCBjb3JyZWN0IGJlY2F1c2UgaXQgYWxzZSBmb3Igb2RpcmVjdC13cml0ZSBmb3IgcmVndWxhciBm aWxlLg0KPj4gSmlhbnBlbmcgTWEgKDIpOg0KPj4gICBmcy9ibG9jay1kZXYuYzpmaXggcGVyZm9y bWFuY2UgcmVncmVzc2lvbiBpbiBPX0RJUkVDVCB3cml0ZXMgdG8NCj4+ICAgICBtZCBibG9jayBk ZXZpY2VzLg0KPg0KPkluIHJhaWQ1LCBhbGwgcmVxdWVzdHMgYXJlIHN1Ym1pdHRlZCBieSByYWlk NWQgdGhyZWFkLCB3aGljaCBhbHJlYWR5IGhhcw0KPnBsdWcuIFdoeSBkb2Vzbid0IGl0IHdvcms/ DQpOby4gdGhlIHB1cnBvc2Ugb2YgdHdvIHBhdGNoIGlzIHRvIHJlZHVjZSB0aGUgcmVhZCBvcGVy YXRpb24gd2hlbiB3cml0ZSB3aGljaCB3YXMgbm90IGZ1bGwtd3JpdGUuDQpJIHRlc3RlZCBpbiBS SEVMNi5UaGUgcmVhZCBvcGVyYXRpb24gaXMgemVyby5CdXQgaW4gMy41LjAtcmM1LCB0aGUgcmVh ZCBvcGVyYWl0b24gbWF5IGVxdWFsIHRvIHdyaXRlLW9wZXJhdGlvbi4NCkFuZCBpIHVzZWQgdGhl IGJzIHdhcyAxNTM2aygzKjUxMmsoY2h1bmstc2l6ZSkpLg0KPg0KPj4gICByYWlkNTogRm9yIHdy aXRlIHBlcmZvcm1hbmNlLCByZW1vdmUgUkVRX1NZTkMgd2hlbiB3cml0ZSB3YXMgb2RpcmVjdC4N Cj4NCj5SRVFfU1lOQyBvbmx5IGltcGFjdHMgQ0ZRLCB0aGlzIHNvdW5kcyBub3QgcmVhc29uYWJs ZS4gU28gdGhlIGRpc2tzDQo+YXJlIHVzaW5nIENGUSBpb3NjaGVkdWxlci4gQ2FuIHlvdSBjaGVj ayBpZiB5b3UgY2FuIHNlZSB0aGUgc2FtZSBpc3N1ZQ0KPndpdGggZGVhZGxpbmU/DQpJIHRlc3Rl ZCBhbmQgdGhlIHJlc3VsdCBpcyB0aGUgc2FtZSBsaWtlIGNmcS4NCkJ1dCBpbiBSSEVMNiwgdGhl IGlvc2NoZWR1bGVyIGlzIGFsc28gY2ZxLg0KPg0KPkxldCBtZSBndWVzcywgd2l0aG91dCBSRVFf U1lOQywgcmVhZCB3aWxsIGdldCBoaWdoZXIgcHJpb3JpdHkgYWdhaW5zdCB3cml0ZQ0KPmluIENG USwgc28gaW4gdGhpcyBjYXNlLCB3cml0ZSBnZXRzIGRlbGF5ZWQsIGFuZCBtYXliZSBnZXQgYmV0 dGVyIHdyaXRlDQo+cmVxdWVzdCBtZXJnZS4gQW5kIG5vdyB3aXRoIFJFUV9TWU5DLCByZWFkIGFu ZCB3cml0ZSBoYXMgdGhlIHNhbWUNCj5wcmlvcml0eSwgdGhlcmUgaXMgbGVzcyByZXF1ZXN0IG1l cmdlLg0KPg0KPlRoYW5rcywNCj5TaGFvaHVhDQpGb3IgaGFyZGRpc2ssdGhlIHJlYWQgZm9yIG5v dCBmdWxsLXdyaXRlIHdpbGwgcmVtYXJrbHkgcmVkdWNlIHRoZSBwZXJmb3JtYW5jZS4NClNvIHRo ZSBmaXJzdCBpdCB0byBtYWtlIHdyaXRlIGZ1bGwtd3JpdGUgYXMgcG9zaWJsZS4=