From owner-svn-src-head@FreeBSD.ORG  Mon Aug 29 14:33:03 2011
Return-Path: <owner-svn-src-head@FreeBSD.ORG>
Delivered-To: svn-src-head@FreeBSD.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id EFF68106564A;
	Mon, 29 Aug 2011 14:33:03 +0000 (UTC) (envelope-from avg@FreeBSD.org)
Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140])
	by mx1.freebsd.org (Postfix) with ESMTP id A1A908FC16;
	Mon, 29 Aug 2011 14:33:02 +0000 (UTC)
Received: from odyssey.starpoint.kiev.ua (alpha-e.starpoint.kiev.ua
	[212.40.38.101])
	by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id RAA08209;
	Mon, 29 Aug 2011 17:33:00 +0300 (EEST)
	(envelope-from avg@FreeBSD.org)
Message-ID: <4E5BA31C.7070103@FreeBSD.org>
Date: Mon, 29 Aug 2011 17:33:00 +0300
From: Andriy Gapon <avg@FreeBSD.org>
User-Agent: Mozilla/5.0 (X11; FreeBSD amd64;
	rv:5.0) Gecko/20110705 Thunderbird/5.0
MIME-Version: 1.0
To: Hans Petter Selasky <hselasky@FreeBSD.org>
References: <201107132107.p6DL7ojq099900@svn.freebsd.org>
	<4E5B9334.5020502@FreeBSD.org>
	<201108291627.42477.hselasky@freebsd.org>
In-Reply-To: <201108291627.42477.hselasky@freebsd.org>
X-Enigmail-Version: 1.2pre
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Cc: "svn-src-head@FreeBSD.org" <svn-src-head@FreeBSD.org>,
	"svn-src-all@FreeBSD.org" <svn-src-all@FreeBSD.org>,
	"src-committers@FreeBSD.org" <src-committers@FreeBSD.org>
Subject: Re: svn commit: r223989 - head/sys/dev/usb/input
X-BeenThere: svn-src-head@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: SVN commit messages for the src tree for head/-current
	<svn-src-head.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-head>,
	<mailto:svn-src-head-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/svn-src-head>
List-Post: <mailto:svn-src-head@freebsd.org>
List-Help: <mailto:svn-src-head-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/svn-src-head>,
	<mailto:svn-src-head-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 29 Aug 2011 14:33:04 -0000

on 29/08/2011 17:27 Hans Petter Selasky said the following:
> On Monday 29 August 2011 15:25:08 Andriy Gapon wrote:
>> Another question - why ukbd_yield() is needed?
>> Why kern_yield() would not be good here?
>> What are the priority manipulations in ukbd_yield?
>> Not saying that the code is incorrect, just that this is not explained in
>> the commit message.
> 
> This is needed during mountroot prompt, to allow the worker threads of the USB 
> code to run, because the mountroot code is like:
> 
> while (1) {
>   cngetc();
> }
> 
> instead of:
> 
> while (1) {
>   cngetc();
>   pause("WAIT_A_BIT", 1);
> }

Not sure if this answers my question, which is not about pause vs ukbd_yield, but
is about ukbd_yield vs kern_yield.
In other words, why you couldn't simply use kern_yield where you used ukbd_yield?


-- 
Andriy Gapon