From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx115.postini.com [74.125.245.115]) by kanga.kvack.org (Postfix) with SMTP id DCF656B0081 for ; Fri, 30 Nov 2012 15:42:48 -0500 (EST) Received: by mail-pa0-f41.google.com with SMTP id bj3so635045pad.14 for ; Fri, 30 Nov 2012 12:42:48 -0800 (PST) Date: Fri, 30 Nov 2012 12:42:37 -0800 From: Tejun Heo Subject: Re: 32/64-bit NUMA consolidation behavior regresion Message-ID: <20121130204237.GH3873@htj.dyndns.org> References: <50B6A66E.8030406@linux.vnet.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <50B6A66E.8030406@linux.vnet.ibm.com> Sender: owner-linux-mm@kvack.org List-ID: To: Dave Hansen Cc: LKML , linux-mm@kvack.org, Cody P Schafer Hello, Dave. On Wed, Nov 28, 2012 at 04:03:58PM -0800, Dave Hansen wrote: > My system is just qemu booted with: > > -smp 8 -m 8192 -numa node,nodeid=0,cpus=0-3 -numa node,nodeid=1,cpus=4-7 > > Watch the "PERCPU:" line early in boot, and you can see the "Embedded" > come and go with or without your patch: > > [ 0.000000] PERCPU: Embedded 11 pages/cpu @f3000000 s30592 r0 d14464 > vs > [ 0.000000] PERCPU: 11 4K pages/cpu @f83fe000 s30592 r0 d14464 ... > I don't have a fix handy because I'm working on the original problem, > but I just happened to run across this during a bisect. Just tested 3.7-rc7 w/ qemu and it works as expected here. Can you please boot with the following debug patch and report the boot message before and after? Thanks. diff --git a/arch/x86/kernel/setup_percpu.c b/arch/x86/kernel/setup_percpu.c index 5cdff03..1133dc8 100644 --- a/arch/x86/kernel/setup_percpu.c +++ b/arch/x86/kernel/setup_percpu.c @@ -71,9 +71,13 @@ static bool __init pcpu_need_numa(void) for_each_possible_cpu(cpu) { int node = early_cpu_to_node(cpu); + printk("XXX pcpu_need_numa: cpu%d@%d online=%d ND=%p\n", + cpu, node, node_online(node), NODE_DATA(node)); if (node_online(node) && NODE_DATA(node) && - last && last != NODE_DATA(node)) + last && last != NODE_DATA(node)) { + printk("XXX need numa\n"); return true; + } last = NODE_DATA(node); } -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org