From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753489AbdJNLke (ORCPT ); Sat, 14 Oct 2017 07:40:34 -0400 Received: from terminus.zytor.com ([65.50.211.136]:35453 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753008AbdJNLkc (ORCPT ); Sat, 14 Oct 2017 07:40:32 -0400 Date: Sat, 14 Oct 2017 04:36:51 -0700 From: tip-bot for Ingo Molnar Message-ID: Cc: linux-kernel@vger.kernel.org, tglx@linutronix.de, peterz@infradead.org, tony@atomide.com, hpa@zytor.com, torvalds@linux-foundation.org, mingo@kernel.org, byungchul.park@lge.com, arnd@arndb.de, johan@kernel.org Reply-To: johan@kernel.org, mingo@kernel.org, byungchul.park@lge.com, arnd@arndb.de, torvalds@linux-foundation.org, linux-kernel@vger.kernel.org, tglx@linutronix.de, peterz@infradead.org, hpa@zytor.com, tony@atomide.com In-Reply-To: <20171014072659.f2yr6mhm5ha3eou7@gmail.com> References: <20171014072659.f2yr6mhm5ha3eou7@gmail.com> To: linux-tip-commits@vger.kernel.org Subject: [tip:locking/urgent] locking/lockdep: Disable cross-release features for now Git-Commit-ID: b483cf3bc249d7af706390efa63d6671e80d1c09 X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: b483cf3bc249d7af706390efa63d6671e80d1c09 Gitweb: https://git.kernel.org/tip/b483cf3bc249d7af706390efa63d6671e80d1c09 Author: Ingo Molnar AuthorDate: Sat, 14 Oct 2017 09:26:59 +0200 Committer: Ingo Molnar CommitDate: Sat, 14 Oct 2017 12:50:26 +0200 locking/lockdep: Disable cross-release features for now Johan Hovold reported a big lockdep slowdown on his system, caused by lockdep: > I had noticed that the BeagleBone Black boot time appeared to have > increased significantly with 4.14 and yesterday I finally had time to > investigate it. > > Boot time (from "Linux version" to login prompt) had in fact doubled > since 4.13 where it took 17 seconds (with my current config) compared to > the 35 seconds I now see with 4.14-rc4. > > I quick bisect pointed to lockdep and specifically the following commit: > > 28a903f63ec0 ("locking/lockdep: Handle non(or multi)-acquisition of a crosslock") Because the final v4.14 release is close, disable the cross-release lockdep features for now. Bisected-by: Johan Hovold Debugged-by: Johan Hovold Reported-by: Johan Hovold Cc: Arnd Bergmann Cc: Byungchul Park Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Cc: Tony Lindgren Cc: kernel-team@lge.com Cc: linux-arm-kernel@lists.infradead.org Cc: linux-mm@kvack.org Cc: linux-omap@vger.kernel.org Link: http://lkml.kernel.org/r/20171014072659.f2yr6mhm5ha3eou7@gmail.com Signed-off-by: Ingo Molnar --- lib/Kconfig.debug | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 2689b7c..e270584 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1092,8 +1092,8 @@ config PROVE_LOCKING select DEBUG_MUTEXES select DEBUG_RT_MUTEXES if RT_MUTEXES select DEBUG_LOCK_ALLOC - select LOCKDEP_CROSSRELEASE - select LOCKDEP_COMPLETIONS + select LOCKDEP_CROSSRELEASE if BROKEN + select LOCKDEP_COMPLETIONS if BROKEN select TRACE_IRQFLAGS default n help