Received: by 2002:ad5:474a:0:0:0:0:0 with SMTP id i10csp3219968imu; Sat, 24 Nov 2018 00:24:16 -0800 (PST) X-Google-Smtp-Source: AFSGD/W9/TmJA1GiqS/cJD8po5bsxWahh72xrMvOD4XV9ztpRitvw1sSn7ro+/EoNlq9ijzNlv5N X-Received: by 2002:a65:4b82:: with SMTP id t2mr17212419pgq.189.1543047856106; Sat, 24 Nov 2018 00:24:16 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1543047856; cv=none; d=google.com; s=arc-20160816; b=cR36B+loeEo4t2W4ySoFHcme1QHNB1oyhFFAjL+CA4G+ptINXNLHoUPIEAAFR7bjME ceVSO24Odn/xPsuMC0TtUWVOkRh9OmAa1a4PsblgOUxi0LC5WVw/EK//TiiVjX63nHhs djq5Vhv5/wp0WSPAwwL6hPgVFJtrZG6CYZaEdVQBZnkm4MNtZzi9BDKRk/350K5z+AL3 HpG3MdLIooIVD5C9Td/cKVGvOonFqhiNAzYLkqtlalVdEmQbo3qKUcn70c7r+I6X2yqI QLd2DQ3dQqjJ5wqQTOvEn5B1G+gtIgfAN1dsOcAFeLkNM/WGOT1rQ9bIhNc1+fovwNOQ XGZQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :content-language:accept-language:in-reply-to:references:message-id :date:thread-index:thread-topic:subject:cc:to:from; bh=HRtWiBV2W1lGAFbKhVfGQN53KGlV5p+9sILH8LUk4Ks=; b=QXgRma1mBi5Bks+gwBC6pRbOdA0UgL/4G7w1xUPYJdJ8ERtHLbk1LaWSEN5akSIsMm 1KnrYI8XQj5tKtpEk06OMOA0DUT+HSsOfv/eguq2yYKw89e21fH5gbAGZJluMLVUkjzT a8PWw3cMunjOXlPsg2uKwXz7b4VLzqb0et71uelw525uvKhOQ8gEQrcDQUn28t2lastr WLuvC+my1ZdG0Dn7vwRd51SQtskUnAbsPOLpFP7YOubhB9tnZTSKX6c/K4Fph1NgLbiZ aJMWcT3lKxi41100NcDfQwQy5T4qmwC4zINdn4hRVteeC88r+3A4QtXucNundB/8jSj4 8Tiw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id 97si14828222plb.3.2018.11.24.00.24.01; Sat, 24 Nov 2018 00:24:16 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2503151AbeKWU4I (ORCPT + 99 others); Fri, 23 Nov 2018 15:56:08 -0500 Received: from eu-smtp-delivery-151.mimecast.com ([146.101.78.151]:30287 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2387808AbeKWU4H (ORCPT ); Fri, 23 Nov 2018 15:56:07 -0500 Received: from AcuMS.aculab.com (156.67.243.126 [156.67.243.126]) (Using TLS) by relay.mimecast.com with ESMTP id uk-mta-25-MDF-VcXoPOm9BxBa3KMGBw-1; Fri, 23 Nov 2018 10:12:26 +0000 Received: from AcuMS.Aculab.com (fd9f:af1c:a25b::d117) by AcuMS.aculab.com (fd9f:af1c:a25b::d117) with Microsoft SMTP Server (TLS) id 15.0.1347.2; Fri, 23 Nov 2018 10:12:33 +0000 Received: from AcuMS.Aculab.com ([fe80::43c:695e:880f:8750]) by AcuMS.aculab.com ([fe80::43c:695e:880f:8750%12]) with mapi id 15.00.1347.000; Fri, 23 Nov 2018 10:12:33 +0000 From: David Laight To: David Laight , 'Linus Torvalds' , 'Andrew Lutomirski' CC: "'dvlasenk@redhat.com'" , 'Jens Axboe' , 'Ingo Molnar' , 'Thomas Gleixner' , 'Ingo Molnar' , "'bp@alien8.de'" , 'Peter Anvin' , 'the arch/x86 maintainers' , 'Andrew Morton' , "'Peter Zijlstra'" , "'brgerst@gmail.com'" , 'Linux List Kernel Mailing' , "'pabeni@redhat.com'" Subject: RE: [PATCH] x86: only use ERMS for user copies for larger sizes Thread-Topic: [PATCH] x86: only use ERMS for user copies for larger sizes Thread-Index: AQHUgaBY0KBBfG3q00apJLDxEV5GB6VcD8pwgAAXuEiAAPNRcIAAB5ww Date: Fri, 23 Nov 2018 10:12:33 +0000 Message-ID: <64fd67993af04579b5262c270a7a4694@AcuMS.aculab.com> References: <02bfc577-32a5-66be-64bf-d476b7d447d2@kernel.dk> <20181121063609.GA109082@gmail.com> <48e27a3a-2bb2-ff41-3512-8aeb3fd59e57@kernel.dk> <26eff539-7de7-784c-0c88-f1d30753299d@redhat.com> <7ea44458b90b4d41a08ba9012818d273@AcuMS.aculab.com> In-Reply-To: Accept-Language: en-GB, en-US Content-Language: 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-MC-Unique: MDF-VcXoPOm9BxBa3KMGBw-1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: base64 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org RnJvbTogRGF2aWQgTGFpZ2h0DQo+IFNlbnQ6IDIzIE5vdmVtYmVyIDIwMTggMDk6MzUNCj4gRnJv bTogTGludXMgVG9ydmFsZHMNCj4gPiBTZW50OiAyMiBOb3ZlbWJlciAyMDE4IDE4OjU4DQo+IC4u Lg0KPiA+IE9oLCBhbmQgSSBqdXN0IG5vdGljZWQgdGhhdCBvbiB4ODYgd2UgZXhwcmVzc2x5IHVz ZSBvdXIgb2xkICJzYWZlIGFuZA0KPiA+IHNhbmUiIGZ1bmN0aW9uczogc2VlIF9faW5saW5lX21l bWNweSgpLCBhbmQgaXRzIHVzZSBpbg0KPiA+IF9fbWVtY3B5X3tmcm9tLHRvfWlvKCkuDQo+ID4N Cj4gPiBTbyB0aGUgImZhbGxzIGJhY2sgdG8gbWVtY3B5IiB3YXMgYWx3YXlzIGEgcmVkIGhlcnJp bmcuIFdlIGRvbid0DQo+ID4gYWN0dWFsbHkgZG8gdGhhdC4NCj4gPg0KPiA+IFdoaWNoIGV4cGxh aW5zIHdoeSB0aGluZ3Mgd29yay4NCj4gDQo+IEl0IGRvZXNuJ3QgZXhwbGFpbiB3aHkgSSd2ZSBz ZWVuIHNpbmdsZSBieXRlIFBDSWUgVExQIGdlbmVyYXRlZA0KPiBieSBtZW1jcHlfdG8vZnJvbWlv KCkuDQo+IA0KPiBJJ3ZlIGhhZCB0byBjaGFuZ2UgY29kZSB0byB1c2UgcmVhZHEvd3JpdGVxIGxv b3BzIGJlY2F1c2UgdGhlDQo+IGJ5dGUgYWNjZXNzZXMgYXJlIHNvIHNsb3cgLSBldmVuIHdoZW4g UElPIHBlcmZvcm1hbmNlIHNob3VsZA0KPiBiZSAnZ29vZCBlbm91Z2gnLg0KPiANCj4gSXQgbWln aHQgaGF2ZSBiZWVuIGNoYW5nZWQgc2luY2UgbGFzdCB0aW1lIEkgdGVzdGVkIGl0Lg0KPiBCdXQg SSBkb24ndCByZW1lbWJlciBzZWVpbmcgYSBjb21taXQgZ28gYnkuDQoNCkkndmUganVzdCBwYXRj aGVkIG15IGRyaXZlciBhbmQgcmVkb25lIHRoZSB0ZXN0IG9uIGEgNC4xMyAodWJ1bnR1KSBrZXJu ZWwuDQpDYWxsaW5nIG1lbWNweV9mcm9taW8oa2VybmVsX2J1ZmZlciwgUENJZV9hZGRyZXNzLCBs ZW5ndGgpDQpnZW5lcmF0ZXMgYSBsb3Qgb2Ygc2luZ2xlIGJ5dGUgVExQLg0KDQpXaGF0IHRoZSBj b2RlIG5vcm1hbGx5IGRvZXMgaXMgNjRiaXQgYWxpZ25lZCBQQ0llIHJlYWRzIHdpdGgNCm11bHRp cGxlIHdyaXRlcyBhbmQgc2hpZnRzIHRvIGF2b2lkIHdyaXRpbmcgYmV5b25kIHRoZSBlbmQgb2YN CnRoZSBrZXJuZWwgYnVmZmVyIGZvciAnb2RkJyBsZW5ndGggdHJhbnNmZXJzLg0KDQpNb3N0IG9m IG91ciBQSU8gY29waWVzIGFyZSBhY3R1YWxseSBkaXJlY3QgdG8vZnJvbSB1c2Vyc3BhY2UuDQpX aGlsZSBjb3B5X3RvL2Zyb21fdXNlcigpIHdpbGwgd29yayBvbiBQQ0llIG1lbW9yeSwgaXQgaXMg J3JlcCBtb3N2YicuDQpXZSBhbHNvIG1tYXAoKSB0aGUgUENJZSBzcGFjZSBpbnRvIHByb2Nlc3Mg bWVtb3J5IC0gYW5kIGhhdmUgYmUNCmNhcmVmdWwgbm90IHRvIHVzZSBtZW1jcHkoKSBpbiB1c2Vz cGFjZS4NCg0KT24gc3VpdGFibGUgc3lzdGVtcyB1c2Vyc3BhY2UgY2FuIHVzZSB0aGUgQVZYMjU2 IGluc3RydWN0aW9ucyB0bw0KZ2V0IHdpZGUgcmVhZHMuIE11Y2ggaGFyZGVyIGFuZCBtb3JlIGV4 cGVuc2l2ZSBpbiB0aGUga2VybmVsLg0KDQpJbiBwcmFjdGlzZSBtb3N0IG9mIHRoZSBidWxrIGRh dGEgdHJhbnNmZXJzIGFyZSByZXF1ZXN0ZWQgYnkgdGhlIFBDSWUgc2xhdmUuDQpCdXQgdGhlcmUg YXJlIHRpbWVzIHdoZW4gUElPIG9uZXMgYXJlIG5lZWRlZCwgYW5kIDY0IGJpdCB0cmFuc2ZlcnMg YXJlDQo4IHRpbWVzIGZhc3RlciB0aGFuIDggYml0IG9uZXMuDQpUaGlzIGlzIGFsbCBtYWRlIG1v cmUgc2lnbmlmaWNhbnQgYmVjYXVzZSBpdCB0YWtlcyBvdXIgZnBnYSBhYm91dCA1MDBucw0KdG8g Y29tcGxldGUgYSBzaW5nbGUgd29yZCBQQ0llIHJlYWQuDQoNCglEYXZpZA0KDQotDQpSZWdpc3Rl cmVkIEFkZHJlc3MgTGFrZXNpZGUsIEJyYW1sZXkgUm9hZCwgTW91bnQgRmFybSwgTWlsdG9uIEtl eW5lcywgTUsxIDFQVCwgVUsNClJlZ2lzdHJhdGlvbiBObzogMTM5NzM4NiAoV2FsZXMpDQo=