Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753305AbcCUXCw (ORCPT ); Mon, 21 Mar 2016 19:02:52 -0400 Received: from one.firstfloor.org ([193.170.194.197]:39109 "EHLO one.firstfloor.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750834AbcCUXCv (ORCPT ); Mon, 21 Mar 2016 19:02:51 -0400 Date: Tue, 22 Mar 2016 00:02:49 +0100 From: Andi Kleen To: Andy Lutomirski Cc: Andi Kleen , X86 ML , "linux-kernel@vger.kernel.org" Subject: Re: Updated version of RD/WR FS/GS BASE patchkit Message-ID: <20160321230249.GJ5083@two.firstfloor.org> References: <20160321190322.GZ5083@two.firstfloor.org> <20160321194027.GB5083@two.firstfloor.org> <20160321221148.GF5083@two.firstfloor.org> <20160321224152.GH5083@two.firstfloor.org> <20160321225248.GI5083@two.firstfloor.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.21 (2010-09-15) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 343 Lines: 14 > Maybe. Are there better options? Could we, for example, actually try > to preserve the state if this happens? We probably could, at the cost of making the context switch a bit more expensive. > Would it be worth it? I doubt it. I expect once WR*BASE is widely used noone will bother with selectors for 64bit programs anymore. -Andi