From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932263AbbCIQwV (ORCPT ); Mon, 9 Mar 2015 12:52:21 -0400 Received: from mail-ig0-f181.google.com ([209.85.213.181]:36634 "EHLO mail-ig0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753531AbbCIQwT (ORCPT ); Mon, 9 Mar 2015 12:52:19 -0400 MIME-Version: 1.0 In-Reply-To: <20150309112936.GD26657@destitution> References: <1425741651-29152-1-git-send-email-mgorman@suse.de> <1425741651-29152-5-git-send-email-mgorman@suse.de> <20150307163657.GA9702@gmail.com> <20150308100223.GC15487@gmail.com> <20150309112936.GD26657@destitution> Date: Mon, 9 Mar 2015 09:52:18 -0700 X-Google-Sender-Auth: MSzuYgyXS9gu6YWJBAVZRqmr8I8 Message-ID: Subject: Re: [PATCH 4/4] mm: numa: Slow PTE scan rate if migration failures occur From: Linus Torvalds To: Dave Chinner Cc: Ingo Molnar , Mel Gorman , Andrew Morton , Aneesh Kumar , Linux Kernel Mailing List , Linux-MM , xfs@oss.sgi.com, ppc-dev Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Mar 9, 2015 at 4:29 AM, Dave Chinner wrote: > >> Also, is there some sane way for me to actually see this behavior on a >> regular machine with just a single socket? Dave is apparently running >> in some fake-numa setup, I'm wondering if this is easy enough to >> reproduce that I could see it myself. > > Should be - I don't actually use 500TB of storage to generate this - > 50GB on an SSD is all you need from the storage side. I just use a > sparse backing file to make it look like a 500TB device. :P What's your virtual environment setup? Kernel config, and virtualization environment to actually get that odd fake NUMA thing happening? Linus