From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261606AbVFWLNm (ORCPT ); Thu, 23 Jun 2005 07:13:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262095AbVFWLNm (ORCPT ); Thu, 23 Jun 2005 07:13:42 -0400 Received: from mx2.elte.hu ([157.181.151.9]:11466 "EHLO mx2.elte.hu") by vger.kernel.org with ESMTP id S261606AbVFWLNi (ORCPT ); Thu, 23 Jun 2005 07:13:38 -0400 Date: Thu, 23 Jun 2005 13:13:06 +0200 From: Ingo Molnar To: Andrew Morton Cc: linux-kernel@vger.kernel.org Subject: Re: DEBUG_PAGEALLOC & SMP? Message-ID: <20050623111306.GA6480@elte.hu> References: <20050623090936.GA28112@elte.hu> <20050623022000.094169d4.akpm@osdl.org> <20050623092902.GA29602@elte.hu> <20050623094008.GA31207@elte.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20050623094008.GA31207@elte.hu> User-Agent: Mutt/1.4.2.1i X-ELTE-SpamVersion: MailScanner 4.31.6-itk1 (ELTE 1.2) SpamAssassin 2.63 ClamAV 0.73 X-ELTE-VirusStatus: clean X-ELTE-SpamCheck: no X-ELTE-SpamCheck-Details: score=-4.9, required 5.9, autolearn=not spam, BAYES_00 -4.90 X-ELTE-SpamLevel: X-ELTE-SpamScore: -4 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org * Ingo Molnar wrote: > > full log attached below. (ob'fun: the oom-killer picked the migration > > thread to kill ;) > > this was with the -RT tree - let me try whether the same happens on > vanilla 2.6.12 too. [ 1 hour later ... ] the mystery is solved: i had a ~15 MB kernel image size due to various debugging options plus per-CPU tracing buffer at NR_CPUS=8. PAGEALLOC caused an extra +1MB of DMA-zone kernel footprint (the 4k granular kernel pagetables of 1 GB physical RAM), which was the final drop and depleted the DMA pool completely. Ingo