From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755364AbZHKSSo (ORCPT ); Tue, 11 Aug 2009 14:18:44 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753688AbZHKSSn (ORCPT ); Tue, 11 Aug 2009 14:18:43 -0400 Received: from mail-bw0-f219.google.com ([209.85.218.219]:63118 "EHLO mail-bw0-f219.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753515AbZHKSSn (ORCPT ); Tue, 11 Aug 2009 14:18:43 -0400 Message-ID: <4A81B646.5060301@colorfullife.com> Date: Tue, 11 Aug 2009 20:19:50 +0200 From: Manfred Spraul User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1b3pre) Gecko/20090513 Fedora/3.0-2.3.beta2.fc11 Thunderbird/3.0b2 MIME-Version: 1.0 To: npiggin@suse.de CC: Andrew Morton , Nadia Derbey , Pierre Peiffer , linux-kernel@vger.kernel.org Subject: Re: [patch 4/4] ipc: sem optimise simple operations References: <20090811110902.255877673@suse.de> <20090811111607.310739140@suse.de> In-Reply-To: <20090811111607.310739140@suse.de> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 08/11/2009 01:09 PM, npiggin@suse.de wrote: > Index: linux-2.6/include/linux/sem.h > =================================================================== > --- linux-2.6.orig/include/linux/sem.h > +++ linux-2.6/include/linux/sem.h > @@ -86,6 +86,8 @@ struct task_struct; > struct sem { > int semval; /* current value */ > int sempid; /* pid of last operation */ > + struct list_head negv_pending; > + struct list_head zero_pending; > }; > struct sem is increased from 8 to 24 bytes. Is that still ok? Are there any apps that use really lots of semaphores (i.e.: far more than processes in the system?) Postgres uses lots of small semaphore sets (each with 17 entries), I never had access to other apps.