From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay1.corp.sgi.com [137.38.102.111]) by oss.sgi.com (Postfix) with ESMTP id 91E5E7F7D for ; Fri, 21 Mar 2014 13:03:25 -0500 (CDT) Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by relay1.corp.sgi.com (Postfix) with ESMTP id 856428F804C for ; Fri, 21 Mar 2014 11:03:22 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by cuda.sgi.com with ESMTP id VWilMrtIqbnd23UR for ; Fri, 21 Mar 2014 11:03:18 -0700 (PDT) Date: Fri, 21 Mar 2014 14:02:41 -0400 From: Brian Foster Subject: Re: [FAQ] XFS speculative preallocation Message-ID: <20140321180241.GB3087@laptop.bfoster> 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 ZCBiZWhhdmlvdXIgb3IgCj4gc29tZXRoaW5nIHNpbWlsYXIgdG8gb2xkIGJlaGF2aW91cj8KPiAK CkdvaW5nIGZyb20gdGhlIGNvbW1pdCBsb2cgdGhhdCBpbnRyb2R1Y2VkIHNwZWN1bGF0aXZlIHBy ZWFsbG9jYXRpb24sIGl0CmFwcGVhcnMgdGhhdCB0aGUgYmVoYXZpb3Igd2FzIGVmZmVjdGl2ZWx5 IGFsbG9jc2l6ZT02NGsuIEZvciByZWZlcmVuY2U6CgoJMDU1Mzg4YTMgeGZzOiBkeW5hbWljIHNw ZWN1bGF0aXZlIEVPRiBwcmVhbGxvY2F0aW9uCgo+IDIpIElzIHRoZXJlIGEgd2F5IHRvIHNlZSB3 aGljaCBmaWxlIGdvdCBzb21lIHByZWFsbG9jYXRpb24gYW5kIGhvdyBiaWcgdGhhdCAKPiBwcmVh bGxvY2F0aW9uIGlzPyBTY2VuYXJpbyAtIHNvbWV0aGluZyBhdGUgZnJlZSBzcGFjZSBkdWUgdG8g cHJlYWxsb2NhdGlvbiBhbmQgCj4gZnJvbSBhZG1pbiBwb2ludCBvZiB2aWV3IGl0IHdvdWxkIGJl IHVzZWZ1bGwgdG8ga25vdyB3aGljaCBhcHAgZGlkIHRoYXQgYW5kIAo+IGhvdyBtYW55IE1CIHdh cyBkdWUgdG8gcHJlYWxsb2NhdGlvbiAodnMgcmVhbCwgd3JpdHRlbiBkYXRhKS4KPiAKClRoZSBj b21tb24gc2NlbmFyaW8gaXMgd2hlbiBkdS9zdGF0IHJlcG9ydHMgYSBsYXJnZXIgYmxvY2sgdXNh Z2UgdGhhbgpmaWxlIHNpemUsIHNvIHRoZSBxdWVzdGlvbiBvZiBob3cgbXVjaCBleHRyYSBzcGFj ZSBpcyBhbGxvY2F0ZWQgaXMganVzdAp0aGUgZGlmZmVyZW5jZSBiZXR3ZWVuIHRoZSB0d28uIEkg c3VwcG9zZSB3ZSBjb3VsZCBpbmNsdWRlIGEgc2ltcGxlCmV4YW1wbGUgb2YgdGhhdCBpbiB0aGUg Zmlyc3QgUS4KClRoaXMgaXNuJ3QgbmVjZXNzYXJpbHkgdHJ1ZSBpbiB0aGUgY2FzZSBvZiBzcGFy c2UgZmlsZXMuIHhmc19ibWFwIHByaW50cwp0aGUgZXh0ZW50IGluZm9ybWF0aW9uIGZvciBhIGZp bGUsIHNvIGl0IHNob3VsZCBiZSBwb3NzaWJsZSB0byBkZXRlcm1pbmUKaG93IG11Y2ggcG9zdC1F T0Ygc3BhY2UgZXhpc3RzIGZyb20gbG9va2luZyBhdCB0aGUgZXh0ZW50IHRoYXQgY292ZXJzCkVP Ri4gVGhhdCBzYWlkLCB0aGlzIHN0cmlrZXMgbWUgYXMgbW9yZSAidXNlciBndWlkZSIgbWF0ZXJp YWwgdGhhbiBGQVEuCgo+ID4gTGludXggMy44IChhbmQgbGF0ZXIpIGluY2x1ZGVzIGEgc2Nhbm5l ciB0byBwZXJmb3JtIGJhY2tncm91bmQgdHJpbW1pbmcKPiA+IG9mIGZpbGVzIHdpdGggbGluZ2Vy aW5nIHBvc3QtRU9GIHByZWFsbG9jYXRpb25zLiBUaGUgc2Nhbm5lciBieXBhc3Nlcwo+ID4gZmls ZXMgdGhhdCBoYXZlIGJlZW4gcmVjZW50bHkgCj4gCj4gV2hhdCB0aW1lIGlzICJyZWNlbnRseSIg PyBJcyAibW9kaWZpZWQiIGVxdWFsIHRvICJmaWxlIGRhdGEgbW9kaWZpZWQiIG9yICJmaWxlIAo+ IGRhdGEgb3IgbWV0YWRhdGEgbW9kaWZpZWQiID8KPiAKCkkgb3JpZ2luYWxseSBoYWQgc29tZXRo aW5nIGxpa2UgImZpbGVzIHRoYXQgaGF2ZSBub3QgYmVlbiBtb2RpZmllZCBzaW5jZQpsYXN0IGZs dXNoZWQgdG8gZGlzaywiIHdoaWNoIGlzIHRoZSBoZXVyaXN0aWMgYXMgSSB1bmRlcnN0YW5kIGl0 LiBUaGF0CnNlZW1lZCB0b28gdmVyYm9zZSBhbmQgdGVjaG5pY2FsIGZvciBGQVEuIEkgY291bGQg cmVwbGFjZSAicmVjZW50bHkKbW9kaWZpZWQiIHdpdGggIi4uLiBieXBhc3NlcyBmaWxlcyB0aGF0 IGFyZSBkaXJ0eSAuLi4iIGlmIHRoYXQgaXMgbW9yZQp1c2VmdWwuLj8KCj4gPiBtb2RpZmllZCB0 byBub3QgaW50ZXJmZXJlIHdpdGggb25nb2luZwo+ID4gd3JpdGVzLgo+IAo+IEluIGNhc2Ugb2Yg c29tZSBhcHAgdGhhdCBjb25zdGFudGx5IHdyaXRlcyB0byBmaWxlcyAoYXBhY2hlIHdlYiBzZXJ2 ZXIgCj4gd3JpdHRpbmcgdG8gaXRzIGxvZ3MgZm9yIGV4YW1wbGUpIHRoYXQgYmFja2dyb3VuZCB0 cmltbWluZyB3aWxsIG5ldmVyIGRvIAo+IGFueXRoaW5nIGZvciB0aGVzZSBmaWxlcywgcmlnaHQ/ Cj4gCgpNb3N0IGxpa2VseSB0cnVlLiBUaG91Z2ggYnkgdGhlIHNhbWUgbG9naWMsIHRob3NlIGZp bGVzIHdpbGwgZXZlbnR1YWxseQp1c2UgdGhlIHByZWFsbG9jYXRlZCBzcGFjZS4KCj4gPiBBIDUg bWludXRlIHNjYW4gaW50ZXJ2YWwgaXMgdXNlZCBieSBkZWZhdWx0IGFuZCBjYW4gYmUgYWRqdXN0 ZWQKPiA+IHZpYSB0aGUgZm9sbG93aW5nIGZpbGUgKHZhbHVlIGluIHNlY29uZHMpOgo+ID4gCj4g PiAJL3Byb2Mvc3lzL2ZzL3hmcy9zcGVjdWxhdGl2ZV9wcmVhbGxvY19saWZldGltZQo+ID4gCj4g PiBBbHRob3VnaCBzcGVjdWxhdGl2ZSBwcmVhbGxvY2F0aW9uIGNhbiBsZWFkIHRvIHJlcG9ydHMg b2YgZXhjZXNzIHNwYWNlCj4gPiB1c2FnZSwgdGhlIHByZWFsbG9jYXRlZCBzcGFjZSBpcyBub3Qg cGVybWFuZW50IHVubGVzcyBleHBsaWNpdGx5IG1hZGUgc28KPiA+IHZpYSBmYWxsb2NhdGUgb3Ig YSBzaW1pbGFyIGludGVyZmFjZS4gUHJlYWxsb2NhdGVkIHNwYWNlIGNhbiBhbHNvIGJlCj4gPiBl bmNvZGVkIHBlcm1hbmVudGx5IGluIHNpdHVhdGlvbnMgd2hlcmUgZmlsZSBzaXplIGlzIGV4dGVu ZGVkIGJleW9uZCBhCj4gPiByYW5nZSBvZiBwb3N0LUVPRiBibG9ja3MgKGkuZS4sIHZpYSB0cnVu Y2F0ZSkuIE90aGVyd2lzZSwgcHJlYWxsb2NhdGVkCj4gPiBibG9ja3MgYXJlIHJlY2xhaW1lZCBv biBmaWxlIGNsb3NlLCBpbm9kZSByZWNsYWltLCB1bm1vdW50IG9yIGluIHRoZQo+ID4gYmFja2dy b3VuZCBvbmNlIGZpbGUgd3JpdGUgYWN0aXZpdHkgc3Vic2lkZXMuCj4gCj4gU28gdGhlcmUgaXMg bm8gbWVjaGFuaXNtIHRoYXQgd291bGQgc2hpcm5rIHByZWFsbG9jYXRpb25zIGluIGNhc2Ugd2hl biBmcmVlIAo+IHNwYWNlIGlzIChhbG1vc3Qgb3IpIGdvbmUgb24gYSBmcz8gQ2FzZTogYXBhY2hl IGNhdXNlcyB4ZnMgdG8gcHJlYWxsb2NhdGUgCj4gc2V2ZXJhbCBHQiBmb3IgaXRzIC92YXIvLi4u Li97YWNjZXNzLGVycm9yfV9sb2cgKGNvbW1vbiBwcm9ibGVtIGhlcmUpIGFuZCB0aGVuIAo+IGZy ZWUgc3BhY2UgZW5kcyBvbiB0aGF0IGZzIGNhdXNpbmcgcHJvYmxlbXMgZm9yIGV2ZXJ5IGFwcCB0 aGF0IHdyaXRlcyB0byAvdmFyLgo+IAoKSSBub3RlZCBpbiB0aGUgc2Vjb25kIGFuc3dlciB0aGF0 IHRoZSBwcmVhbGxvY2F0aW9uIGlzIHRocm90dGxlZCBhcyB3ZQpuZWFyIGFsbG9jYXRpb24gbGlt aXRzIHN1Y2ggYXMgbm8gZnJlZSBzcGFjZSBvciBxdW90YS4gSSB0aGluayB0aGF0CnNob3VsZCBj b3ZlciBtb3N0IGNhc2VzLiBJIHN0aWxsIGhhdmUgc29tZSBjb2RlIGx5aW5nIGFyb3VuZCBzb21l d2hlcmUKdGhhdCBmb3JjZXMgYSBzY2FuIGFuZCByZXRyeSBpbiBFRFFVT1Qgc2NlbmFyaW9zIHRo b3VnaC4gSSBzaG91bGQgZHVzdAp0aGF0IG9mZi4uLgoKVGhhbmtzIGZvciB0aGUgcmV2aWV3cyEK CkJyaWFuCgo+IFRoYW5rcyEKPiAKPiAtLSAKPiBBcmthZGl1c3ogTWnFm2tpZXdpY3osIGFyZWtt IC8gbWF2ZW4ucGwKPiAKPiBfX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fXwo+IHhmcyBtYWlsaW5nIGxpc3QKPiB4ZnNAb3NzLnNnaS5jb20KPiBodHRwOi8vb3Nz LnNnaS5jb20vbWFpbG1hbi9saXN0aW5mby94ZnMKCl9fX19fX19fX19fX19fX19fX19fX19fX19f X19fX19fX19fX19fX19fX19fX19fCnhmcyBtYWlsaW5nIGxpc3QKeGZzQG9zcy5zZ2kuY29tCmh0 dHA6Ly9vc3Muc2dpLmNvbS9tYWlsbWFuL2xpc3RpbmZvL3hmcwo=