Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752363Ab3GBMXh (ORCPT ); Tue, 2 Jul 2013 08:23:37 -0400 Received: from ozlabs.org ([203.10.76.45]:38491 "EHLO ozlabs.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750769Ab3GBMXf (ORCPT ); Tue, 2 Jul 2013 08:23:35 -0400 From: Rusty Russell To: Chegu Vinod Cc: prarit@redhat.com, LKML , Gleb Natapov , Paolo Bonzini , KVM Subject: Re: kvm_intel: Could not allocate 42 bytes percpu data In-Reply-To: <51D22931.1080008@hp.com> References: <51C897A7.50302@hp.com> <87ehbisstv.fsf@rustcorp.com.au> <51D22931.1080008@hp.com> User-Agent: Notmuch/0.15.2+81~gd2c8818 (http://notmuchmail.org) Emacs/23.4.1 (i686-pc-linux-gnu) Date: Tue, 02 Jul 2013 15:19:14 +0930 Message-ID: <8761wth5ph.fsf@rustcorp.com.au> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1668 Lines: 54 Chegu Vinod writes: > On 6/30/2013 11:22 PM, Rusty Russell wrote: >> Chegu Vinod writes: >>> Hello, >>> >>> Lots (~700+) of the following messages are showing up in the dmesg of a >>> 3.10-rc1 based kernel (Host OS is running on a large socket count box >>> with HT-on). >>> >>> [ 82.270682] PERCPU: allocation failed, size=42 align=16, alloc from >>> reserved chunk failed >>> [ 82.272633] kvm_intel: Could not allocate 42 bytes percpu data >> Woah, weird.... >> >> Oh. Shit. Um, this is embarrassing. >> >> Thanks, >> Rusty. > > > Thanks for your response! > >> === >> module: do percpu allocation after uniqueness check. No, really! >> >> v3.8-rc1-5-g1fb9341 was supposed to stop parallel kvm loads exhausting >> percpu memory on large machines: >> >> Now we have a new state MODULE_STATE_UNFORMED, we can insert the >> module into the list (and thus guarantee its uniqueness) before we >> allocate the per-cpu region. >> >> In my defence, it didn't actually say the patch did this. Just that >> we "can". >> >> This patch actually *does* it. >> >> Signed-off-by: Rusty Russell >> Tested-by: Noone it seems. > > Your following "updated" fix seems to be working fine on the larger > socket count machine with HT-on. OK, did you definitely revert every other workaround? If so, please give me a Tested-by: line... Thanks, Rusty. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/