Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932925AbbKMQW5 (ORCPT ); Fri, 13 Nov 2015 11:22:57 -0500 Received: from mail-ig0-f174.google.com ([209.85.213.174]:35709 "EHLO mail-ig0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932676AbbKMQW4 (ORCPT ); Fri, 13 Nov 2015 11:22:56 -0500 Subject: Re: __i915_spin_request() sucks To: Mike Galbraith References: <5644F850.2060803@kernel.dk> <5644F941.9090505@kernel.dk> <20151112221908.GA26194@nuc-i3427.alporthouse.com> <56451812.2050704@kernel.dk> <20151113091558.GN6247@nuc-i3427.alporthouse.com> <20151113153629.GB8939@kernel.dk> <1447431225.5655.66.camel@gmail.com> Cc: Chris Wilson , Daniel Vetter , DRI Development , LKML From: Jens Axboe Message-ID: <56460E5C.6000602@kernel.dk> Date: Fri, 13 Nov 2015 09:22:52 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: <1447431225.5655.66.camel@gmail.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 725 Lines: 19 On 11/13/2015 09:13 AM, Mike Galbraith wrote: > On Fri, 2015-11-13 at 08:36 -0700, Jens Axboe wrote: >> Previous patch was obvious pre-coffee crap, this should work for using >> ktime to spin max 1usec. > > 1us seems a tad low. I doubt the little wooden gears and pulleys of my > core2 Toshiba Satellite lappy can get one loop ground out in a usec :) Maybe it is, it's based off the original intent of the function, though. See the original commit referenced. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/