From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda3.sgi.com [192.48.176.15]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id p66FDD5Y129008 for ; Wed, 6 Jul 2011 10:13:13 -0500 Received: from mx1.redhat.com (localhost [127.0.0.1]) by cuda.sgi.com (Spam Firewall) with ESMTP id 2B59E1EE993D for ; Wed, 6 Jul 2011 08:13:12 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by cuda.sgi.com with ESMTP id pF5ASxA1syovPzPn for ; Wed, 06 Jul 2011 08:13:12 -0700 (PDT) Date: Wed, 6 Jul 2011 17:12:29 +0200 From: Johannes Weiner Subject: Re: [PATCH 03/27] xfs: use write_cache_pages for writeback clustering Message-ID: <20110706151229.GA1998@redhat.com> References: <20110629140109.003209430@bombadil.infradead.org> <20110629140336.950805096@bombadil.infradead.org> <20110701022248.GM561@dastard> <20110701041851.GN561@dastard> <20110701093305.GA28531@infradead.org> <20110701154136.GA17881@localhost> <20110704032534.GD1026@dastard> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20110704032534.GD1026@dastard> 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 Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: Dave Chinner Cc: Christoph Hellwig , "linux-mm@kvack.org" , Wu Fengguang , Mel Gorman , "xfs@oss.sgi.com" T24gTW9uLCBKdWwgMDQsIDIwMTEgYXQgMDE6MjU6MzRQTSArMTAwMCwgRGF2ZSBDaGlubmVyIHdy b3RlOgo+IE9uIEZyaSwgSnVsIDAxLCAyMDExIGF0IDExOjQxOjM2UE0gKzA4MDAsIFd1IEZlbmdn dWFuZyB3cm90ZToKPiA+IENocmlzdG9waCwKPiA+IAo+ID4gT24gRnJpLCBKdWwgMDEsIDIwMTEg YXQgMDU6MzM6MDVQTSArMDgwMCwgQ2hyaXN0b3BoIEhlbGx3aWcgd3JvdGU6Cj4gPiA+IEpvaGFu bmVzLCBNZWwsIFd1LAo+ID4gPiAKPiA+ID4gRGF2ZSBoYXMgYmVlbiBzdHJlc3Npbmcgc29tZSBY RlMgcGF0Y2hlcyBvZiBtaW5lIHRoYXQgcmVtb3ZlIHRoZSBYRlMKPiA+ID4gaW50ZXJuYWwgd3Jp dGViYWNrIGNsdXN0ZXJpbmcgaW4gZmF2b3VyIG9mIHVzaW5nIHdyaXRlX2NhY2hlX3BhZ2VzLgo+ ID4gPiAKPiA+ID4gQXMgcGFydCBvZiBpbnZlc3RpZ2F0aW5nIHRoZSBiZWhhdmlvdXIgaGUgZm91 bmQgb3V0IHRoYXQgd2UncmUgc3RpbGwKPiA+ID4gZG9pbmcgbG90cyBvZiBJL08gZnJvbSB0aGUg ZW5kIG9mIHRoZSBMUlUgaW4ga3N3YXBkLiAgTm90IG9ubHkgaXMgdGhhdAo+ID4gPiBwcmV0dHkg YmFkIGJlaGF2aW91ciBpbiBnZW5lcmFsLCBidXQgaXQgYWxzbyBtZWFucyB3ZSByZWFsbHkgY2Fu J3QKPiA+ID4ganVzdCByZW1vdmUgdGhlIHdyaXRlYmFjayBjbHVzdGVyaW5nIGluIHdyaXRlcGFn ZSBnaXZlbiBob3cgbXVjaAo+ID4gPiBJL08gaXMgc3RpbGwgZG9uZSB0aHJvdWdoIHRoYXQuCj4g PiA+IAo+ID4gPiBBbnkgY2hhbmNlIHdlIGNvdWxkIHRoZSB3cml0ZWJhY2sgdnMga3N3YXAgYmVo YXZpb3VyIHNvcnRlZCBvdXQgYSBiaXQKPiA+ID4gYmV0dGVyIGZpbmFsbHk/Cj4gPiAKPiA+IEkg b25jZSB0cmllZCB0aGlzIGFwcHJvYWNoOgo+ID4gCj4gPiBodHRwOi8vd3d3LnNwaW5pY3MubmV0 L2xpc3RzL2xpbnV4LW1tL21zZzA5MjAyLmh0bWwKPiA+IAo+ID4gSXQgdXNlZCBhIGxpc3Qgc3Ry dWN0dXJlIHRoYXQgaXMgbm90IGxpbmVhcmx5IHNjYWxhYmxlLCBob3dldmVyIHRoYXQKPiA+IHBh cnQgc2hvdWxkIGJlIGluZGVwZW5kZW50bHkgaW1wcm92YWJsZSB3aGVuIG5lY2Vzc2FyeS4KPiAK PiBJIGRvbid0IHRoaW5rIHRoYXQgaGFuZGluZyByYW5kb20gd3JpdGViYWNrIHRvIHRoZSBmbHVz aGVyIHRocmVhZCBpcwo+IG11Y2ggYmV0dGVyIHRoYW4gZG9pbmcgcmFuZG9tIHdyaXRlYmFjayBk aXJlY3RseS4gIFllcywgeW91IGFkZGVkCj4gc29tZSBjbHVzdGVyaW5nLCBidXQgSSdtIHN0aWxs IGRvbid0IHRoaW5rIHdyaXRpbmcgc3BlY2lmaWMgcGFnZXMgaXMKPiB0aGUgYmVzdCBzb2x1dGlv bi4KPiAKPiA+IFRoZSByZWFsIHByb2JsZW0gd2FzLCBpdCBzZWVtIHRvIG5vdCB2ZXJ5IGVmZmVj dGl2ZSBpbiBteSB0ZXN0IHJ1bnMuCj4gPiBJIGZvdW5kIG1hbnkgLT5ucl9wYWdlcyB3b3JrcyBx dWV1ZWQgYmVmb3JlIHRoZSAtPmlub2RlIHdvcmtzLCB3aGljaAo+ID4gZWZmZWN0aXZlbHkgbWFr ZXMgdGhlIGZsdXNoZXIgd29ya2luZyBvbiBtb3JlIGRpc3BlcnNlZCBwYWdlcyByYXRoZXIKPiA+ IHRoYW4gZm9jdXNpbmcgb24gdGhlIGRpcnR5IHBhZ2VzIGVuY291bnRlcmVkIGluIExSVSByZWNs YWltLgo+IAo+IEJ1dCB0aGF0J3MgcmVhbGx5IGp1c3QgYW4gaW1wbGVtZW50YXRpb24gaXNzdWUg cmVsYXRlZCB0byBob3cgeW91Cj4gdHJpZWQgdG8gc29sdmUgdGhlIHByb2JsZW0uIFRoYXQgY291 bGQgYmUgYWRkcmVzc2VkLgo+IAo+IEhvd2V2ZXIsIHdoYXQgSSdtIHF1ZXN0aW9uaW5nIGlzIHdo ZXRoZXIgd2Ugc2hvdWxkIGV2ZW4gY2FyZSB3aGF0Cj4gcGFnZSBtZW1vcnkgcmVjbGFpbSB3YW50 cyB0byB3cml0ZSAtIGl0IHNlZW1zIHRvIG1ha2UgZnVuZGFtZW50YWxseQo+IGJhZCBkZWNpc2lv bnMgZnJvbSBhbiBJTyBwZXJzZXBjdGl2ZS4KPiAKPiBXZSBoYXZlIHRvIHJlbWVtYmVyIHRoYXQg bWVtb3J5IHJlY2xhaW0gaXMgZG9pbmcgTFJVIHJlY2xhaW0gYW5kIHRoZQo+IGZsdXNoZXIgdGhy ZWFkcyBhcmUgZG9pbmcgIm9sZGVzdCBmaXJzdCIgd3JpdGViYWNrLiBJT1dzLCBib3RoIGFyZSB0 cnlpbmcKPiB0byBvcGVyYXRlIGluIHRoZSBzYW1lIGRpcmVjdGlvbiAob2xkZXN0IHRvIHlvdW5n ZXN0KSBmb3IgdGhlIHNhbWUKPiBwdXJwb3NlLiAgVGhlIGZ1bmRhbWVudGFsIHByb2JsZW0gdGhh dCBvY2N1cnMgd2hlbiBtZW1vcnkgcmVjbGFpbQo+IHN0YXJ0cyB3cml0aW5nIHBhZ2VzIGJhY2sg ZnJvbSB0aGUgTFJVIGlzIHRoaXM6Cj4gCj4gCS0gbWVtb3J5IHJlY2xhaW0gaGFzIHJ1biBhaGVh ZCBvZiBJTyB3cml0ZWJhY2sgLQo+IAo+IFRoZSBMUlUgdXN1YWxseSBsb29rcyBsaWtlIHRoaXM6 Cj4gCj4gCW9sZGVzdAkJCQkJeW91bmdlc3QKPiAJKy0tLS0tLS0tLS0tLS0tLSstLS0tLS0tLS0t LS0tLS0rLS0tLS0tLS0tLS0tLS0rCj4gCWNsZWFuCQl3cml0ZWJhY2sJZGlydHkKPiAJCQleCQle Cj4gCQkJfAkJfAo+IAkJCXwJCVdoZXJlIGZsdXNoZXIgd2lsbCBuZXh0IHdvcmsgZnJvbQo+IAkJ CXwJCVdoZXJlIGtzd2FwZCBpcyB3b3JraW5nIGZyb20KPiAJCQl8Cj4gCQkJSU8gc3VibWl0dGVk IGJ5IGZsdXNoZXIsIHdhaXRpbmcgb24gY29tcGxldGlvbgo+IAo+IAo+IElmIG1lbW9yeSByZWNs YWltIGlzIGhpdHRpbmcgZGlydHkgcGFnZXMgb24gdGhlIExSVSwgaXQgbWVhbnMgaXQgaGFzCj4g Z290IGFoZWFkIG9mIHdyaXRlYmFjayB3aXRob3V0IGJlaW5nIHRocm90dGxlZCAtIGl0J3MgcGFz c2VkIG92ZXIKPiBhbGwgdGhlIHBhZ2VzIGN1cnJlbnRseSB1bmRlciB3cml0ZWJhY2sgYW5kIGlz IHRyeWluZyB0byB3cml0ZSBiYWNrCj4gcGFnZXMgdGhhdCBhcmUgKm5ld2VyKiB0aGFuIHdoYXQg d3JpdGViYWNrIGlzIHdvcmtpbmcgb24uIElPV3MsIGl0Cj4gc3RhcnRzIHRyeWluZyB0byBkbyB0 aGUgam9iIG9mIHRoZSBmbHVzaGVyIHRocmVhZHMsIGFuZCBpdCBkb2VzIHRoYXQKPiB2ZXJ5IGJh ZGx5Lgo+IAo+IFRoZSAkMTAwIHF1ZXN0aW9uIGlzIOKIl3doeSBpcyBpdCBnZXR0aW5nIGFoZWFk IG9mIHdyaXRlYmFjayo/CgpVbmxlc3MgeW91IGhhdmUgYSBwdXJlbHkgc2VxdWVudGlhbCB3cml0 ZXIsIHRoZSBMUlUgb3JkZXIgaXMgLSBhdApsZWFzdCBpbiB0aGVvcnkgLSBkaXZlcmdpbmcgYXdh eSBmcm9tIHRoZSB3cml0ZWJhY2sgb3JkZXIuCgpBY2NvcmRpbmcgdG8gdGhlIHJlYXNvbmluZyBi ZWhpbmQgZ2VuZXJhdGlvbmFsIGdhcmJhZ2UgY29sbGVjdGlvbiwKdGhleSBzaG91bGQgaW4gZmFj dCBiZSBpbnZlcnNlIHRvIGVhY2ggb3RoZXIuICBUaGUgb2xkZXN0IHBhZ2VzIHN0aWxsCmluIHVz ZSBhcmUgdGhlIG1vc3QgbGlrZWx5IHRvIGJlIHN0aWxsIG5lZWRlZCBpbiB0aGUgZnV0dXJlLgoK SW4gcHJhY3RpY2Ugd2Ugb25seSBtYWtlIGEgZ2VuZXJhdGlvbmFsIGRpc3RpbmN0aW9uIGJldHdl ZW4gdXNlZC1vbmNlCmFuZCB1c2VkLW1hbnksIHdoaWNoIG1hbmlmZXN0cyBpbiB0aGUgaW5hY3Rp dmUgYW5kIHRoZSBhY3RpdmUgbGlzdC4KQnV0IHN0aWxsLCB3aGVuIHJlY2xhaW0gc3RhcnRzIG9m ZiB3aXRoIGEgbG9jYWxpemVkIHdyaXRlciwgdGhlIG9sZGVzdApwYWdlcyBhcmUgbGlrZWx5IHRv IGJlIGF0IHRoZSBlbmQgb2YgdGhlIGFjdGl2ZSBsaXN0LgoKU28gcGFnZXMgZnJvbSB0aGUgaW5h Y3RpdmUgbGlzdCBhcmUgbGlrZWx5IHRvIGJlIHdyaXR0ZW4gaW4gdGhlIHJpZ2h0Cm9yZGVyLCBi dXQgYXQgdGhlIHNhbWUgdGltZSBhY3RpdmUgcGFnZXMgYXJlIGV2ZW4gb2xkZXIsIHRodXMgd3Jp dHRlbgpiZWZvcmUgdGhlbS4gIE1lbW9yeSByZWNsYWltIHN0YXJ0cyB3aXRoIHRoZSBpbmFjdGl2 ZSBwYWdlcywgYW5kIHRoaXMKaXMgd2h5IGl0IGdldHMgYWhlYWQuCgpUaGVuIHRoZXJlIGlzIGFs c28gdGhlIGNhc2Ugd2hlcmUgYSBmYXN0IHdyaXRlciBwdXNoZXMgZGlydHkgcGFnZXMgdG8KdGhl IGVuZCBvZiB0aGUgTFJVIGxpc3QsIG9mIGNvdXJzZSwgYnV0IHlvdSBhbHJlYWR5IHNhaWQgdGhh dCB0aGlzIGlzCm5vdCBhcHBsaWNhYmxlIHRvIHlvdXIgd29ya2xvYWQuCgpNeSBwb2ludCBpcyB0 aGF0IEkgZG9uJ3QgdGhpbmsgaXQncyB1bmV4cGVjdGVkIHRoYXQgZGlydHkgcGFnZXMgY29tZQpv ZmYgdGhlIGluYWN0aXZlIGxpc3QgaW4gcHJhY3RpY2UuICBJdCBqdXN0IHN1Y2tzIGhvdyB3ZSBo YW5kbGUgdGhlbS4KCl9fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19fX19f X19fCnhmcyBtYWlsaW5nIGxpc3QKeGZzQG9zcy5zZ2kuY29tCmh0dHA6Ly9vc3Muc2dpLmNvbS9t YWlsbWFuL2xpc3RpbmZvL3hmcwo=