From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752249AbcF3Nkp (ORCPT ); Thu, 30 Jun 2016 09:40:45 -0400 Received: from merlin.infradead.org ([205.233.59.134]:56454 "EHLO merlin.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751424AbcF3Nko (ORCPT ); Thu, 30 Jun 2016 09:40:44 -0400 Date: Thu, 30 Jun 2016 15:03:57 +0200 From: Peter Zijlstra To: Byungchul Park Cc: mingo@kernel.org, linux-kernel@vger.kernel.org, npiggin@suse.de, walken@google.com, ak@suse.de, tglx@inhelltoy.tec.linutronix.de Subject: Re: [RFC 05/12] lockdep: Implement crossrelease feature Message-ID: <20160630130357.GE30154@twins.programming.kicks-ass.net> References: <1466398527-1122-1-git-send-email-byungchul.park@lge.com> <1466398527-1122-6-git-send-email-byungchul.park@lge.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <1466398527-1122-6-git-send-email-byungchul.park@lge.com> User-Agent: Mutt/1.5.23.1 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jun 20, 2016 at 01:55:20PM +0900, Byungchul Park wrote: > +struct cross_lock { > + unsigned int gen_id; 4 byte hole > + struct list_head xlock_entry; > + > + /* > + * Seperated hlock instance. This will be used when > + * building a dependency chain for a crosslock, say, > + * commit. > + */ > + struct held_lock hlock; > + > + int ref; /* reference count */ 4 byte hole > +}; A trivial re-arrangement would shrink this structure by 8 bytes. After which its still at least 64 bytes.