From mboxrd@z Thu Jan 1 00:00:00 1970 From: "H. Peter Anvin" Subject: Re: [PATCHSET] percpu: generalize first chunk allocators and improve lpage NUMA support Date: Thu, 25 Jun 2009 19:02:48 -0700 Message-ID: <4A442C48.6060308@zytor.com> References: <1245850216-31653-1-git-send-email-tj@kernel.org> <20090624165508.30b88343.akpm@linux-foundation.org> <20090625000202.GR6760@one.firstfloor.org> <4A42C131.6040007@zytor.com> <20090625091939.GS6760@one.firstfloor.org> <4A43871F.9030507@zytor.com> <20090625195408.GW6760@one.firstfloor.org> <4A43DAFD.90409@zytor.com> <20090625202642.GX6760@one.firstfloor.org> <4A4418EA.9000705@kernel.org> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Return-path: Received: from terminus.zytor.com ([198.137.202.10]:39746 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752431AbZFZCEs (ORCPT ); Thu, 25 Jun 2009 22:04:48 -0400 In-Reply-To: <4A4418EA.9000705@kernel.org> Sender: linux-arch-owner@vger.kernel.org List-ID: To: Tejun Heo Cc: Andi Kleen , Andrew Morton , linux-kernel@vger.kernel.org, x86@kernel.org, linux-arch@vger.kernel.org, mingo@elte.hu, tglx@linutronix.de, cl@linux-foundation.org Tejun Heo wrote: > Andi Kleen wrote: >>> I don't know why, but in the configuration I saw each percpu area was >>> something like 1.8 MB. >> That sounds like something that needs to be investigated and fixed then. >> In a sense per cpu space is precious like stack space and shouldn't >> be wasted. > > The large percpu space is most likely from lockdep. > That makes sense. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.