From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ua0-f200.google.com (mail-ua0-f200.google.com [209.85.217.200]) by kanga.kvack.org (Postfix) with ESMTP id 5E73D6B0311 for ; Thu, 1 Jun 2017 11:35:52 -0400 (EDT) Received: by mail-ua0-f200.google.com with SMTP id j62so14463143uaj.12 for ; Thu, 01 Jun 2017 08:35:52 -0700 (PDT) Received: from resqmta-ch2-01v.sys.comcast.net (resqmta-ch2-01v.sys.comcast.net. [2001:558:fe21:29:69:252:207:33]) by mx.google.com with ESMTPS id q43si9582757uaf.71.2017.06.01.08.35.51 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 01 Jun 2017 08:35:51 -0700 (PDT) Date: Thu, 1 Jun 2017 10:31:03 -0500 (CDT) From: Christoph Lameter Subject: Re: 4.12-rc ppc64 4k-page needs costly allocations In-Reply-To: Message-ID: References: <87h9014j7t.fsf@concordia.ellerman.id.au> Content-Type: text/plain; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: Hugh Dickins Cc: Michael Ellerman , "Aneesh Kumar K.V" , linuxppc-dev@lists.ozlabs.org, linux-mm@kvack.org > > I am curious as to what is going on there. Do you have the output from > > these failed allocations? > > I thought the relevant output was in my mail. I did skip the Mem-Info > dump, since that just seemed noise in this case: we know memory can get > fragmented. What more output are you looking for? The output for the failing allocations when you disabling debugging. For that I would think that you need remove(!) the slub_debug statement on the kernel command line. You can verify that debug is off by inspecting the values in /sys/kernel/slab// > But it was still order 4 when booted with slub_debug=O, which surprised me. > And that surprises you too? If so, then we ought to dig into it further. No it does no longer. I dont think slub_debug=O does disable debugging (frankly I am not sure what it does). Please do not specify any debug options. -- 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