From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 15A68C197A0 for ; Thu, 16 Nov 2023 10:08:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344973AbjKPKIj (ORCPT ); Thu, 16 Nov 2023 05:08:39 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60172 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230365AbjKPKId (ORCPT ); Thu, 16 Nov 2023 05:08:33 -0500 Received: from eu-smtp-delivery-151.mimecast.com (eu-smtp-delivery-151.mimecast.com [185.58.85.151]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9874CC5 for ; Thu, 16 Nov 2023 02:08:29 -0800 (PST) Received: from AcuMS.aculab.com (156.67.243.121 [156.67.243.121]) by relay.mimecast.com with ESMTP with both STARTTLS and AUTH (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384) id uk-mtapsc-4-KbudXczuMvSlfOhXmqjSIA-1; Thu, 16 Nov 2023 10:08:18 +0000 X-MC-Unique: KbudXczuMvSlfOhXmqjSIA-1 Received: from AcuMS.Aculab.com (10.202.163.6) by AcuMS.aculab.com (10.202.163.6) with Microsoft SMTP Server (TLS) id 15.0.1497.48; Thu, 16 Nov 2023 10:07:35 +0000 Received: from AcuMS.Aculab.com ([::1]) by AcuMS.aculab.com ([::1]) with mapi id 15.00.1497.048; Thu, 16 Nov 2023 10:07:35 +0000 From: David Laight To: 'Linus Torvalds' , Borislav Petkov CC: David Howells , kernel test robot , "oe-lkp@lists.linux.dev" , "lkp@intel.com" , "linux-kernel@vger.kernel.org" , Christian Brauner , Alexander Viro , Jens Axboe , Christoph Hellwig , Christian Brauner , Matthew Wilcox , "ying.huang@intel.com" , "feng.tang@intel.com" , "fengwei.yin@intel.com" Subject: RE: [linus:master] [iov_iter] c9eec08bac: vm-scalability.throughput -16.9% regression Thread-Topic: [linus:master] [iov_iter] c9eec08bac: vm-scalability.throughput -16.9% regression Thread-Index: AQHaF/9mUr/d/cPMC0WC86r1pNT+UrB8tOyw Date: Thu, 16 Nov 2023 10:07:35 +0000 Message-ID: <4c0c3ee6cfa84d21a807055bc1aa27b8@AcuMS.aculab.com> References: <202311061616.cd495695-oliver.sang@intel.com> <3865842.1700061614@warthog.procyon.org.uk> <20231115190938.GGZVUXcuUjI3i1JRAB@fat_crate.local> In-Reply-To: Accept-Language: en-GB, en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-ms-exchange-transport-fromentityheader: Hosted x-originating-ip: [10.202.205.107] MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: aculab.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RnJvbTogTGludXMgVG9ydmFsZHMNCj4gU2VudDogMTUgTm92ZW1iZXIgMjAyMyAyMDowNw0KLi4u DQo+ICAtIG91ciBjdXJyZW50ICJtZW1jcHlfb3JpZyIgZmFsbGJhY2sgZG9lcyB1bnJvbGxlZCBj b3B5IGxvb3BzLCBhbmQNCj4gdGhlIHJlcF9tb3ZzX2FsdGVybmF0aXZlIGZhbGxiYWNrIG9idmlv dXNseSBkb2Vzbid0Lg0KPiANCj4gSXQncyBub3QgY2xlYXIgdGhhdCB0aGUgdW5yb2xsZWQgY29w eSBsb29wcyBtYXR0ZXIgZm9yIHRoZSBpbi1rZXJuZWwNCj4ga2luZHMgb2YgY29waWVzLCBidXQg d2hvIGtub3dzLiBUaGUgbWVtY3B5X29yaWcgY29kZSBpcyBkZWZpbml0ZWx5DQo+IHRyeWluZyB0 byBiZSBzbWFydGVyIGluIHNvbWUgb3RoZXIgd2F5cyB0b28uIFNvIHRoZSBmYWxsYmFjayBzaG91 bGQNCj4gdHJ5IGEgKmJpdCogaGFyZGVyIHRoYW4gSSBkaWQsIGFuZCBub3QganVzdCB3aXRoIHRo ZSB3aG9sZSAiZG9uJ3QgdHJ5DQo+IHRvIGhhbmRsZSBleGNlcHRpb25zIiBpc3N1ZSBJIG1lbnRp b25lZC4NCg0KSSdtIHByZXR0eSBzdXJlIHRoZSB1bnJvbGxlZCBjb3B5IChhbmQgb3RoZXIgdW5y b2xsZWQgbG9vcHMpDQpqdXN0IHdhc3RlcyBJLWNhY2hlIGFuZCBzbG93cyB0aGluZ3MgZG93biBj b2xkLWNhY2hlLg0KDQpXaXRoIG91dCBvZiBvcmRlciBleGVjdXRlIG9uIG1vc3QgeDg2IGNwdSAo ZXhjZXB0IGF0b21zKSB5b3UNCmRvbid0IHJlYWxseSBoYXZlIHRvIHdvcnJ5IGFib3V0IHRoZSBt ZW1vcnkgbGF0ZW5jeS4NClNvIGdldCB0aGUgbG9vcCBjb250cm9sIGluc3RydWN0aW9ucyB0byBy dW4gaW4gcGFyYWxsZWwgd2l0aA0KdGhlIG1lbW9yeSBhY2Nlc3Mgb25lcyBhbmQgeW91IGNhbiBj b3B5IG9uZSB3b3JkIGV2ZXJ5IGNsb2NrLg0KSSBuZXZlciBtYW5hZ2VkIGEgc2luZ2xlIGNsb2Nr IGxvb3AsIGJ1dCB5b3UgY2FuIGdldCBhIHR3bw0KY2xvY2sgbG9vcCAod2l0aCAyIHJlYWRzIGFu ZCAyIHdyaXRlcyBpbiBpdCkuDQoNClNvIHVucm9sbGluZyBvbmNlIGlzIHR5cGljYWxseSBlbm91 Z2guDQoNCllvdSBjYW4gYWxzbyBpZ25vcmUgYWxpZ25tZW50LCB0aGUgZXh0cmEgY29zdCBpcyBt aW5pbWFsIChvbg0KSW50ZWwgY3B1IGF0IGxlYXN0KS4gSSB0aGluayBpdCByZXF1aXJlcyBhbiBl eHRyYSB1LW9wIHdoZW4NCnRoZSBjb3B5IGNyb3NzZXMgYSBjYWNoZSBsaW5lIGJvdW5kYWRyeS4N Cg0KT24gaGFzd2VsbCAod2hpY2ggaXMgbm93IHF1aXRlIG9sZCkgYm90aCAncmVwIG1vdnNiJyBh bmQNCidyZXAgbW92c3EnIGNvcHkgMTYgYnl0ZXMvY2xvY2sgdW5sZXNzIHRoZSBkZXN0aW5hdGlv bg0KaXMgMzIgYnl0ZSBhbGlnbmVkIHdoZW4gdGhleSBjb3B5IDMyIGJ5dGVzL2Nsb2NrLg0KU291 cmNlIGFsaWdubWVudCBtYWtlIG5vIGRpZmZlcmVudCwgbmVpdGhlciBkb2VzIGJ5dGUNCmFsaWdu bWVudC4NCg0KQW5vdGhlciAtT3Mgc3R1cGlkaXR5IGlzICdwdXNoICR4OyBwb3AgJXJlZycgdG8g bG9hZA0KYSBzaWduZWQgYnl0ZSBjb25zdGFudC4NCg0KCURhdmlkDQoNCi0NClJlZ2lzdGVyZWQg QWRkcmVzcyBMYWtlc2lkZSwgQnJhbWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24gS2V5bmVz LCBNSzEgMVBULCBVSw0KUmVnaXN0cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg==