From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755426AbaEFWt1 (ORCPT ); Tue, 6 May 2014 18:49:27 -0400 Received: from cdptpa-outbound-snat.email.rr.com ([107.14.166.228]:30109 "EHLO cdptpa-oedge-vip.email.rr.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1754409AbaEFWtY (ORCPT ); Tue, 6 May 2014 18:49:24 -0400 Date: Tue, 6 May 2014 18:49:22 -0400 From: Steven Rostedt To: Linus Torvalds Cc: Andy Lutomirski , Thomas Gleixner , Linux Kernel Mailing List , "the arch/x86 maintainers" , Gleb Natapov , Paolo Bonzini Subject: Re: [ABOMINATION] x86: Fast interrupt return to userspace Message-ID: <20140506184922.61ba640b@gandalf.local.home> In-Reply-To: References: X-Mailer: Claws Mail 3.9.3 (GTK+ 2.24.22; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-RR-Connecting-IP: 107.14.168.142:25 X-Cloudmark-Score: 0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 6 May 2014 14:48:50 -0700 Linus Torvalds wrote: > Yeah, it's disgusting. I think it is worth fixing to get better > numbers (it *would* be very interesting to hear whether this plus the > kernel 'retq' thing actually makes real device interrupt overhead > lower), but I'd be very wary of using it in production. Darn it. I was actually hoping that someone else could have the reputation of doing "I can't believe they actually did this" code in the kernel. -- Steve