Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757249Ab1DWVQe (ORCPT ); Sat, 23 Apr 2011 17:16:34 -0400 Received: from mail-qy0-f181.google.com ([209.85.216.181]:48375 "EHLO mail-qy0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755541Ab1DWVQa convert rfc822-to-8bit (ORCPT ); Sat, 23 Apr 2011 17:16:30 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=googlemail.com; s=gamma; h=mime-version:reply-to:in-reply-to:references:date:message-id :subject:from:to:cc:content-type:content-transfer-encoding; b=vl5sJHQFdXkiI/6To0uMYybw/j6WSNexRCWRUjMSSL9grwxyFjhthHzIGwXKqAIIWD L5HO6sMuNEPgvqtZSmz+pM7N2cRtKvcPKjqPqcQq5R79sFWBptpxZkXY2OvVc79Oj//E T7jaeX2u0gIunCInnLiK2dUhkJ2wtPjFuuCoo= MIME-Version: 1.0 Reply-To: sedat.dilek@gmail.com In-Reply-To: <20110423210539.GI2628@linux.vnet.ibm.com> References: <20110421050823.GA4487@linux.vnet.ibm.com> <20110421142853.GA2235@linux.vnet.ibm.com> <20110422005046.GQ2235@linux.vnet.ibm.com> <20110422150222.GA2300@linux.vnet.ibm.com> <20110423210539.GI2628@linux.vnet.ibm.com> Date: Sat, 23 Apr 2011 23:16:29 +0200 Message-ID: Subject: Re: linux-next: Tree for April 14 (Call-traces: RCU/ACPI/WQ related?) From: Sedat Dilek To: paulmck@linux.vnet.ibm.com Cc: Stephen Rothwell , linux-next@vger.kernel.org, LKML Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 4040 Lines: 99 On Sat, Apr 23, 2011 at 11:05 PM, Paul E. McKenney wrote: > On Fri, Apr 22, 2011 at 07:36:58PM +0200, Sedat Dilek wrote: >> On Fri, Apr 22, 2011 at 5:02 PM, Paul E. McKenney >> wrote: >> > On Fri, Apr 22, 2011 at 11:40:54AM +0200, Sedat Dilek wrote: >> >> On Fri, Apr 22, 2011 at 2:50 AM, Paul E. McKenney >> >> wrote: >> >> > On Thu, Apr 21, 2011 at 04:47:31PM +0200, Sedat Dilek wrote: >> >> >> On Thu, Apr 21, 2011 at 4:28 PM, Paul E. McKenney >> >> >> wrote: >> >> >> > On Thu, Apr 21, 2011 at 02:49:37PM +0200, Sedat Dilek wrote: >> >> >> >> On Thu, Apr 21, 2011 at 12:24 PM, Sedat Dilek >> >> >> >> wrote: >> >> > >> >> > [ . . . ] >> >> > >> >> >> >> Here the results from the 2nd-run (PREEMPT_RCU enabled). >> >> >> > >> >> >> > OK, and the grace periods clearly stopped advancing early on. >> >> >> > >> >> >> > Beyond that point, the per-CPU kthread is blocked, but RCU has some >> >> >> > work for it to do.  So someone has called invoke_rcu_cpu_kthread(), >> >> >> > but rcu_cpu_kthread() is still blocked.  I don't see a bug right >> >> >> > off-hand, but it is early in the morning for me, so I might easily >> >> >> > be missing something. >> >> >> > >> >> >> > Hmmm... >> >> >> > >> >> >> > The synchronization between these two assumes that the per-CPU >> >> >> > kthread is always bound to the respective CPU, so if was somehow >> >> >> > being migrated off, that might explain these results. >> >> >> > >> >> >> > I will add some more diagnostics, test them locally, then push >> >> >> > out an update.  Seem reasonable? >> >> >> > >> >> >> > And thank you again for the testing!!! >> >> >> >> >> >> Ping me when you have new stuff for testing. >> >> >> Tomorrow (friday), here is public holiday and monday, too. >> >> >> So a looong weekend. >> >> > >> >> > ;-) >> >> > >> >> > OK, I have a new sedat.2011.04.21a branch in the -rcu git tree: >> >> > >> >> > git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu.git >> >> > >> >> > This is against 2.6.39-rc3, as before.  (Yes, I do need to rebase to >> >> > 2.6.39-rc4, but didn't want to change any more than I had to.) >> >> > >> >> > I also have an updated script, which is attached.  The output is similar >> >> > to the earlier one, and it operated is pretty much the same way. >> >> > >> >> > Have a great weekend, and I look forward to seeing what shows up on >> >> > this round.  I confess to still being quite puzzled! >> >> > >> >> >                                                        Thanx, Paul >> >> > >> >> >> >> Here are the results of the Sedat's vote (European song contest :-)). >> > >> > ;-) >> > >> > Very strange.  RCU has told the per-CPU kthread that it needs to get >> > to work, but this kthread is still waiting from RCU's viewpoint. >> > Yet the "ps" command believes that this kthread is in fact runnable >> > at SCHED_FIFO priority 1. >> > >> > I can tell that this one will require some thought...  And more >> > diagnostics... >> > >> >                                                        Thanx, Paul >> > >> >> "We are with you in spirit." >> >> ( Level XX from Hybris shooter-game on Amiga (1989) ) > > OK, I added a few more diagnostics: sedat.2011.04.23a in -rcu: > > git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-2.6-rcu.git > > When you get a chance, could you please give it a try? > >                                                        Thanx, Paul > As soon as I can clone/pull from new GIT repo/branch. Currently, I don't see it only, but kernel-mirrors are sometimes slow. I will report later. - Sedat - -- 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/