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Mon, 26 Nov 2018 16:05:56 -0500 Received: from eu-smtp-delivery-151.mimecast.com ([146.101.78.151]:45850 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726176AbeKZVFz (ORCPT ); Mon, 26 Nov 2018 16:05:55 -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-137-_152VRO_PfyeL8BccYBtBg-1; Mon, 26 Nov 2018 10:12:15 +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; Mon, 26 Nov 2018 10:12:23 +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; Mon, 26 Nov 2018 10:12:23 +0000 From: David Laight To: 'Andy Lutomirski' , Linus Torvalds CC: Andrew Lutomirski , "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: AQHUgaBY0KBBfG3q00apJLDxEV5GB6VcD8pwgAAXuEiAAPNRcIAAB5wwgACbAc2ABB2pkA== Date: Mon, 26 Nov 2018 10:12:23 +0000 Message-ID: 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> <64fd67993af04579b5262c270a7a4694@AcuMS.aculab.com> <0D9E579C-F980-4BB7-A282-42206F6636F3@amacapital.net> In-Reply-To: <0D9E579C-F980-4BB7-A282-42206F6636F3@amacapital.net> 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: _152VRO_PfyeL8BccYBtBg-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 RnJvbTogQW5keSBMdXRvbWlyc2tpDQo+IFNlbnQ6IDIzIE5vdmVtYmVyIDIwMTggMTk6MTENCj4g PiBPbiBOb3YgMjMsIDIwMTgsIGF0IDExOjQ0IEFNLCBMaW51cyBUb3J2YWxkcyA8dG9ydmFsZHNA bGludXgtZm91bmRhdGlvbi5vcmc+IHdyb3RlOg0KPiA+DQo+ID4+IE9uIEZyaSwgTm92IDIzLCAy MDE4IGF0IDEwOjM5IEFNIEFuZHkgTHV0b21pcnNraSA8bHV0b0BhbWFjYXBpdGFsLm5ldD4gd3Jv dGU6DQo+ID4+DQo+ID4+IFdoYXQgaXMgbWVtY3B5X3RvX2lvIGV2ZW4gc3VwcG9zZWQgdG8gZG8/ ICBJ4oCZbSBndWVzc2luZyBpdOKAmXMgZGVmaW5lZCBhcw0KPiA+PiBzb21ldGhpbmcgbGlrZSDi gJxjb3B5IHRoaXMgZGF0YSB0byBJTyBzcGFjZSB1c2luZyBhdCBtb3N0IGxvbmctc2l6ZWQgd3Jp dGVzLA0KPiA+PiBhbGwgYWxpZ25lZCwgYW5kIHdyaXRpbmcgZWFjaCBieXRlIGV4YWN0bHkgb25j ZSwgaW4gb3JkZXIu4oCdDQo+ID4+IFRoYXQgc291bmRzLi4uIGR1YmlvdXNseSB1c2VmdWwuDQo+ ID4NCj4gPiBXZSd2ZSBnb3QgaHVuZHJlZHMgb2YgdXNlcnMgb2YgaXQsIHNvIGl0J3MgZmFpcmx5 IGNvbW1vbi4uDQo+IA0KPiBJ4oCZbSB3b25kZXJpbmcgaWYgdGhlIOKAnGF0IG1vc3QgbG9uZy1z aXplc+KAnSByZXN0cmljdGlvbiBtYXR0ZXJzLCBlc3BlY2lhbGx5DQo+IGdpdmVuIHRoYXQgd2Xi gJlyZSBhcHBhcmVudGx5IGFjY2Vzc2luZyBzb21lIG9mIHRoZSBzYW1lIGJ5dGVzIG1vcmUgdGhh biBvbmNlLg0KPiBJIHdvdWxkIGJlbGlldmUgdGhhdCB0cnlpbmcgdG8gZW5jb3VyYWdlIDE2LWJ5 dGUgd3JpdGVzICh3aXRoIEFWWCwgdWdoKSBvcg0KPiA2NC1ieXRlIHdyaXRlcyAod2l0aCBNT1ZE SVI2NEIpIHdvdWxkIGJlIHNhZmUgYW5kIGNvdWxkIG1lYW5pbmdmdWxseSBzcGVlZA0KPiB1cCBz b21lIHdvcmtsb2Fkcy4NCg0KVGhlIHJlYWwgZ2FpbnMgY29tZSBmcm9tIGluY3JlYXNpbmcgdGhl IHdpZHRoIG9mIElPIHJlYWRzLCBub3QgSU8gd3JpdGVzLg0KTm9uZSBvZiB0aGUgeDg2IGNwdXMg SSd2ZSBnb3QgaXNzdWUgbXVsdGlwbGUgY29uY3VycmVudCBQQ0llIHJlYWRzDQoodGhlIFBDSWUg Y29tcGxldGlvbiB0YWcgc2VlbXMgdG8gbWF0Y2ggdGhlIGNvcmUgbnVtYmVyKS4NClBDSWUgd3Jp dGVzIGFyZSBhbGwgJ3Bvc3RlZCcgc28gdGhlcmUgYXJlbid0IGJpZyBnYXBzIGJldHdlZW4gdGhl bS4NCg0KPiA+PiBJIGNvdWxkIHNlZSBhIGZ1bmN0aW9uIHRoYXQgd3JpdGVzIHRvIGFsaWduZWQg bWVtb3J5IGluIHNwZWNpZmllZC1zaXplZCBjaHVua3MuDQo+ID4NCj4gPiBXZSBoYXZlIHRoYXQu IEl0J3MgY2FsbGVkICJfX2lvd3JpdGV7MzIsNjR9X2NvcHkoKSIuIEl0IGhhcyB2ZXJ5IGZldyB1 c2Vycy4NCg0KRm9yIHg4NiB5b3Ugd2FudCBzZXBhcmF0ZSBlbnRyeSBwb2ludHMgZm9yIHRoZSAn cmVwIG1vdnEnIGNvcHkNCmFuZCBvbmUgdXNpbmcgYW4gaW5zdHJ1Y3Rpb24gbG9vcC4NCihQZXJo YXBzIHdpdGggZ3VpZGFuY2UgdG8gdGhlIGN1dG92ZXIgbGVuZ3RoLikNCkluIG1vc3QgcGxhY2Vz IHRoZSBkcml2ZXIgd2lsbCBrbm93IHdoZXRoZXIgdGhlIHNpemUgaXMgYWJvdmUgb3IgYmVsb3cN CnRoZSBjdXRvdmVyIC0gd2hpY2ggbWlnaHQgYmUgMjU2Lg0KQ2VydGFpbmx5IHRyYW5zZmVycyBi ZWxvdyA2NCBieXRlcyBhcmUgJ3Nob3J0Jy4NCg0KCURhdmlkDQoNCi0NClJlZ2lzdGVyZWQgQWRk cmVzcyBMYWtlc2lkZSwgQnJhbWxleSBSb2FkLCBNb3VudCBGYXJtLCBNaWx0b24gS2V5bmVzLCBN SzEgMVBULCBVSw0KUmVnaXN0cmF0aW9uIE5vOiAxMzk3Mzg2IChXYWxlcykNCg==