From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S266127AbUHFTSZ (ORCPT ); Fri, 6 Aug 2004 15:18:25 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S266126AbUHFTSZ (ORCPT ); Fri, 6 Aug 2004 15:18:25 -0400 Received: from e33.co.us.ibm.com ([32.97.110.131]:50609 "EHLO e33.co.us.ibm.com") by vger.kernel.org with ESMTP id S266127AbUHFTSF (ORCPT ); Fri, 6 Aug 2004 15:18:05 -0400 Date: Sun, 8 Aug 2004 00:45:37 +0530 From: Dipankar Sarma To: Andrew Morton Cc: Rusty Russell , "Paul E. McKenney" , linux-kernel@vger.kernel.org, Robert Olsson , netdev@oss.sgi.com Subject: RCU : various patches [0/5] Message-ID: <20040807191536.GA3936@in.ibm.com> Reply-To: dipankar@in.ibm.com Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.4.1i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org This is a series of patches that are currently in my tree. These apply on 2.6.8-rc3-mm1 (on top the earlier 3 patches in -mm). Of these, the first one is a cleanup to avoid percpu data address calculations and also prepration for call_rcu_bh(). The call-rcu-bh patches introduce a separate RCU mechanism for softirq handlers with handler completion as another quiescent state and use it in route cache. This avoids the dst cache overflow problems Robert Olsson was seeing during his router DoS testing. All this work happened after a long private email discussion some months ago involving Alexey, Robert, Dave Miller and some of us. I am publishing the work so that people can test it. It would be nice to give the entire stack a spin in -mm. The remaining two patches are from Paul that documents RCU apis and hides smp_read_barrier_depends() using a simple macro - rcu_dereference(). I have tested the call-rcu-bh stuff with pktgen and saw no route cache overflows. The complete stack is also sanity tested. Thanks Dipankar