From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay3.corp.sgi.com [198.149.34.15]) by oss.sgi.com (Postfix) with ESMTP id A75E47F83 for ; Fri, 21 Mar 2014 18:16:35 -0500 (CDT) Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by relay3.corp.sgi.com (Postfix) with ESMTP id 2DCAAAC005 for ; Fri, 21 Mar 2014 16:16:35 -0700 (PDT) Received: from ipmail06.adl6.internode.on.net (ipmail06.adl6.internode.on.net [150.101.137.145]) by cuda.sgi.com with ESMTP id aOmCMreAEtpwqGcu for ; Fri, 21 Mar 2014 16:16:32 -0700 (PDT) Date: Sat, 22 Mar 2014 10:16:17 +1100 From: Dave Chinner Subject: Re: [FAQ] XFS speculative preallocation Message-ID: <20140321231617.GD1389@dastard> References: <20140321162920.GA3087@laptop.bfoster> <201403211809.03683.arekm@maven.pl> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <201403211809.03683.arekm@maven.pl> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: Arkadiusz =?utf-8?Q?Mi=C5=9Bkiewicz?= Cc: xfs@oss.sgi.com T24gRnJpLCBNYXIgMjEsIDIwMTQgYXQgMDY6MDk6MDNQTSArMDEwMCwgQXJrYWRpdXN6IE1pxZtr aWV3aWN6IHdyb3RlOgo+IE9uIEZyaWRheSAyMSBvZiBNYXJjaCAyMDE0LCBCcmlhbiBGb3N0ZXIg d3JvdGU6Cj4gPiBIaSBhbGwsCj4gPiAKPiA+IEVyaWMgaGFkIHN1Z2dlc3RlZCB3ZSBhZGQgYW4g RkFRIGVudHJ5IGZvciBzcGVjdWxhdGl2ZSBwcmVhbGxvY2F0aW9uCj4gPiBzaW5jZSBpdCBzZWVt cyB0byBiZSBhIGNvbW1vbiBxdWVzdGlvbiwgc28gSSBvZmZlcmVkIHRvIHdyaXRlIHNvbWV0aGlu Zwo+ID4gdXAuIEkgc3RhcnRlZCB3aXRoIGEgc2luZ2xlIGVudHJ5IGJ1dCBzcGxpdCBpdCBpbnRv IGEgY291cGxlIFEncyB3aGVuIGl0Cj4gPiB0dXJuZWQgaW50byBUTDtEUiBmb2RkZXIuIDspCj4g PiAKPiA+IFRoZSB0ZXh0IGlzIGVtYmVkZGVkIGJlbG93IGZvciByZXZpZXcuIFRob3VnaHRzIG9u IHRoZSBxdWVzdGlvbnMgb3IKPiA+IGNvbnRlbnQgaXMgYXBwcmVjaWF0ZWQuIEFsc28sIG9uY2Ug Zm9sa3MgYXJlIE9rIHdpdGggdGhpcy4uLiBob3cgZG9lcwo+ID4gb25lIGdhaW4gZWRpdCBhY2Nl c3MgdG8gdGhlIHdpa2k/Cj4gCj4gTW9yZSBxdWVzdGlvbnMgb3IgdG9waWNzIHRoYXQgY2FuIGJl IGNvbnZlcnRlZCB0byBxdWVzdGlvbnMgZnJvbSBtZToKPiAKPiAxKSBCZWZvcmUgcHJlYWxsb2Nh dGlvbiBrZXJuZWwgZGlkIHRoaW5ncyBkaWZmZXJlbnRseS4gQUZBSUsgaXQgd2Fzbid0IHRoZSAK PiBzYW1lIGFzIGFsbG9jc2l6ZT02NGssIHdhcyBpdD8gSXMgdGhlcmUgYSB3YXkgdG8gZ2V0IG9s ZCBiZWhhdmlvdXIgb3IgCj4gc29tZXRoaW5nIHNpbWlsYXIgdG8gb2xkIGJlaGF2aW91cj8KClRo ZSBvbGQgYmVoYXZpb3VyIGlzIGV4YWN0bHkgdGhhdCBvZiBhbGxvY3NpemU9NjRrLgoKPiA+IG1v ZGlmaWVkIHRvIG5vdCBpbnRlcmZlcmUgd2l0aCBvbmdvaW5nCj4gPiB3cml0ZXMuCj4gCj4gSW4g Y2FzZSBvZiBzb21lIGFwcCB0aGF0IGNvbnN0YW50bHkgd3JpdGVzIHRvIGZpbGVzIChhcGFjaGUg d2ViIHNlcnZlciAKPiB3cml0dGluZyB0byBpdHMgbG9ncyBmb3IgZXhhbXBsZSkgdGhhdCBiYWNr Z3JvdW5kIHRyaW1taW5nIHdpbGwgbmV2ZXIgZG8gCj4gYW55dGhpbmcgZm9yIHRoZXNlIGZpbGVz LCByaWdodD8KCklmIHRoZSBpbm9kZSBpcyBiZWluZyBjb25zdGFudGx5IGRpcnRpZWQsIHRoZW4g dGhlIHNwZWN1bGF0aXZlCnByZWFsbG9jIHdpbGwgbm90IGJlIHJlbW92ZWQgYnkgdGhlIGJhY2tn cm91bmQgc2Nhbm5lci4gSXQgb25seQpyZW1vdmVzIHByZWFsbG9jIGZyb20gY2xlYW4gaW5vZGVz LgoKPiA+IEEgNSBtaW51dGUgc2NhbiBpbnRlcnZhbCBpcyB1c2VkIGJ5IGRlZmF1bHQgYW5kIGNh biBiZSBhZGp1c3RlZAo+ID4gdmlhIHRoZSBmb2xsb3dpbmcgZmlsZSAodmFsdWUgaW4gc2Vjb25k cyk6Cj4gPiAKPiA+IAkvcHJvYy9zeXMvZnMveGZzL3NwZWN1bGF0aXZlX3ByZWFsbG9jX2xpZmV0 aW1lCj4gPiAKPiA+IEFsdGhvdWdoIHNwZWN1bGF0aXZlIHByZWFsbG9jYXRpb24gY2FuIGxlYWQg dG8gcmVwb3J0cyBvZiBleGNlc3Mgc3BhY2UKPiA+IHVzYWdlLCB0aGUgcHJlYWxsb2NhdGVkIHNw YWNlIGlzIG5vdCBwZXJtYW5lbnQgdW5sZXNzIGV4cGxpY2l0bHkgbWFkZSBzbwo+ID4gdmlhIGZh bGxvY2F0ZSBvciBhIHNpbWlsYXIgaW50ZXJmYWNlLiBQcmVhbGxvY2F0ZWQgc3BhY2UgY2FuIGFs c28gYmUKPiA+IGVuY29kZWQgcGVybWFuZW50bHkgaW4gc2l0dWF0aW9ucyB3aGVyZSBmaWxlIHNp emUgaXMgZXh0ZW5kZWQgYmV5b25kIGEKPiA+IHJhbmdlIG9mIHBvc3QtRU9GIGJsb2NrcyAoaS5l LiwgdmlhIHRydW5jYXRlKS4gT3RoZXJ3aXNlLCBwcmVhbGxvY2F0ZWQKPiA+IGJsb2NrcyBhcmUg cmVjbGFpbWVkIG9uIGZpbGUgY2xvc2UsIGlub2RlIHJlY2xhaW0sIHVubW91bnQgb3IgaW4gdGhl Cj4gPiBiYWNrZ3JvdW5kIG9uY2UgZmlsZSB3cml0ZSBhY3Rpdml0eSBzdWJzaWRlcy4KPiAKPiBT byB0aGVyZSBpcyBubyBtZWNoYW5pc20gdGhhdCB3b3VsZCBzaGlybmsgcHJlYWxsb2NhdGlvbnMg aW4gY2FzZSB3aGVuIGZyZWUgCj4gc3BhY2UgaXMgKGFsbW9zdCBvcikgZ29uZSBvbiBhIGZzPwoK QmFja2dyb3VuZCBzcGFjZSB0cmltbWVyIHRha2VzIGNhcmUgb2YgdGhhdC4gV2UgY291bGQgcHJv YmFibHkgYWxzbwp0cmlnZ2VyIGl0IG9uIEVOT1NQQywgYnV0IG9uY2UgeW91IGFyZSBhbHJlYWR5 IGF0IEVOT1NQQyBpdCdzIHRvbwpsYXRlLi4uLgoKPiBDYXNlOiBhcGFjaGUgY2F1c2VzIHhmcyB0 byBwcmVhbGxvY2F0ZSAKPiBzZXZlcmFsIEdCIGZvciBpdHMgL3Zhci8uLi4uL3thY2Nlc3MsZXJy b3J9X2xvZyAoY29tbW9uIHByb2JsZW0gaGVyZSkgYW5kIHRoZW4gCj4gZnJlZSBzcGFjZSBlbmRz IG9uIHRoYXQgZnMgY2F1c2luZyBwcm9ibGVtcyBmb3IgZXZlcnkgYXBwIHRoYXQgd3JpdGVzIHRv IC92YXIuCgpZb3VyIGxvZyBmaWxlcyB3b3VsZCBoYXZlIHRvIGFscmVhZHkgYmUgR0IgaW4gc2l6 ZSBmb3IgdGhhdCB5b3VyCmFwYWNoZSBsb2dzIHRvIHByZWFsbG9jYXRlIHRoYXQgbXVjaC4gSWYg eW91ciBsb2cgZmlsZXMgYXJlIHRoYXQKYmlnLCB0aGVuIC92YXIgbmVlZHMgdG8gYmUgbXVjaCwg bXVjaCBsYXJnZXIgdGhhbiB3aGF0IHRoZQpzcGVjdWxhdGl2ZSBwcmVhbGxvYyBmb3IgYSBoYW5k ZnVsIG9mIGZpbGVzIGNvdWxkIGVhc2lseSBleGhhdXN0LgoKQ2hlZXJzLAoKRGF2ZS4KLS0gCkRh dmUgQ2hpbm5lcgpkYXZpZEBmcm9tb3JiaXQuY29tCgpfX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fXwp4ZnMgbWFpbGluZyBsaXN0Cnhmc0Bvc3Muc2dpLmNvbQpo dHRwOi8vb3NzLnNnaS5jb20vbWFpbG1hbi9saXN0aW5mby94ZnMK