From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-qg0-f46.google.com (mail-qg0-f46.google.com [209.85.192.46]) by kanga.kvack.org (Postfix) with ESMTP id CC3E76B0253 for ; Thu, 24 Sep 2015 21:04:26 -0400 (EDT) Received: by qgx61 with SMTP id 61so58925438qgx.3 for ; Thu, 24 Sep 2015 18:04:26 -0700 (PDT) Received: from mx1.redhat.com (mx1.redhat.com. [209.132.183.28]) by mx.google.com with ESMTPS id m189si713365qhb.61.2015.09.24.18.04.25 for (version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 24 Sep 2015 18:04:26 -0700 (PDT) Message-ID: <56049D97.6080106@redhat.com> Date: Thu, 24 Sep 2015 21:04:23 -0400 From: Rik van Riel MIME-Version: 1.0 Subject: Re: numa balancing stuck in task_work_run References: <5604665D.3030504@stratus.com> <560467B8.6000101@stratus.com> In-Reply-To: <560467B8.6000101@stratus.com> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Joe Lawrence , Mel Gorman Cc: linux-mm@kvack.org On 09/24/2015 05:14 PM, Joe Lawrence wrote: > [ +cc for linux-mm mailinglist address ] > > On 09/24/2015 05:08 PM, Joe Lawrence wrote: >> Hi Mel, Rik et al, >> >> We've encountered interesting NUMA balancing behavior on RHEL7.1, >> reproduced with an upstream 4.2 kernel (of similar .config), that can >> leave a user process trapped in the kernel performing task_numa_work. >> >> Our test group set up a server with 256GB memory running a program that >> allocates and dirties ~50% of that memory. They reported the following >> condition when they attempted to kill the test process -- the signal was >> never handled, instead traces showed the task stuck here: Does the bug still happen with this patch applied? https://git.kernel.org/cgit/linux/kernel/git/tip/tip.git/commit/?id=4620f8c1fda2af4ccbd11e194e2dd785f7d7f279 -- All rights reversed -- 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