From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1034584AbcIVSpA (ORCPT ); Thu, 22 Sep 2016 14:45:00 -0400 Received: from userp1040.oracle.com ([156.151.31.81]:51095 "EHLO userp1040.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1030244AbcIVSoU (ORCPT ); Thu, 22 Sep 2016 14:44:20 -0400 From: Babu Moger To: peterz@infradead.org, mingo@redhat.com, akpm@linux-foundation.org, keescook@chromium.org, dan.j.williams@intel.com, aryabinin@virtuozzo.com, tj@kernel.org Cc: linux-kernel@vger.kernel.org, babu.moger@oracle.com Subject: [PATCH 0/2] Ajust lockdep static allocations Date: Thu, 22 Sep 2016 11:43:34 -0700 Message-Id: <1474569816-170269-1-git-send-email-babu.moger@oracle.com> X-Mailer: git-send-email 1.7.1 X-Source-IP: userv0021.oracle.com [156.151.31.71] Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org These patches adjust the static allocations for lockdep data structures used for debugging locking correctness. The current code reserves about 4MB extra space for these data structures. Most of the configurations do not need these many data structures. While testing, I have not seen it go beyond 20% of already reserved entries. $grep "lock-classes" /proc/lockdep_stats lock-classes: 1560 [max: 8191] Reserving even more space seems unreasonable. So, keeping the default entries small as before the Commit 1413c0389333 ("lockdep: Increase static allocations"). Added new CONFIG_PROVE_LOCKING_PLUS in case someone needs more entries to debug their large configuration. Patch 1 : Adjusts the sizes based on the new config parameter patch 2 : Adds new config parameter Babu Moger (2): lockdep: Keep the default static allocations small config: Add new CONFIG_PROVE_LOCKING_PLUS kernel/locking/lockdep_internals.h | 14 +++++++++++--- lib/Kconfig.debug | 10 ++++++++++ 2 files changed, 21 insertions(+), 3 deletions(-)