From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rodrigo Amestica Subject: real-time priority Date: Thu, 19 Mar 2009 18:45:15 -0400 Message-ID: <49C2CAFB.5030702@lavabit.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit To: linux-rt-users@vger.kernel.org Return-path: Received: from karen.lavabit.com ([72.249.41.33]:59764 "EHLO karen.lavabit.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752161AbZCSXDW (ORCPT ); Thu, 19 Mar 2009 19:03:22 -0400 Received: from d.earth.lavabit.com (d.earth.lavabit.com [192.168.111.13]) by karen.lavabit.com (Postfix) with ESMTP id 1652711B848 for ; Thu, 19 Mar 2009 17:45:16 -0500 (CDT) Received: from 192.168.1.110 (c-76-104-20-168.hsd1.va.comcast.net [76.104.20.168]) by lavabit.com with ESMTP id X3LNM3WINIWI for ; Thu, 19 Mar 2009 17:45:16 -0500 Sender: linux-rt-users-owner@vger.kernel.org List-ID: Hi, general questions from somebody who's just starting to look into the preempt patch. the article linked below makes direct reference to the behavior of the preempt rt patch. The article was written in 2007. How much of that still holds true in the current version of the patch? I'm basically wondering about the first sentences in the abstract of that article. The big picture seems to be rather simple: calls to specific linux services could break the performance of a real time task by depending on lower priority tasks to complete that service. Does this mean that one must always be alert to which system services are invoked during the execution of a real time task? Does the vanilla kernel or the preempt-rt patch tries to somehow detect this condition and alert somehow? thanks, Rodrigo