From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-oi0-f43.google.com (mail-oi0-f43.google.com [209.85.218.43]) by kanga.kvack.org (Postfix) with ESMTP id 9DCA46B0035 for ; Tue, 5 Aug 2014 18:26:45 -0400 (EDT) Received: by mail-oi0-f43.google.com with SMTP id u20so1095950oif.30 for ; Tue, 05 Aug 2014 15:26:45 -0700 (PDT) Received: from aserp1040.oracle.com (aserp1040.oracle.com. [141.146.126.69]) by mx.google.com with ESMTPS id ei10si7270703oeb.91.2014.08.05.15.26.44 for (version=TLSv1 cipher=RC4-SHA bits=128/128); Tue, 05 Aug 2014 15:26:44 -0700 (PDT) Message-ID: <53E159F6.7080603@oracle.com> Date: Tue, 05 Aug 2014 18:25:58 -0400 From: Sasha Levin MIME-Version: 1.0 Subject: Re: vmstat: On demand vmstat workers V8 References: <53D31101.8000107@oracle.com> <53DFFD28.2030502@oracle.com> In-Reply-To: Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Christoph Lameter Cc: akpm@linux-foundation.org, Gilad Ben-Yossef , Thomas Gleixner , Tejun Heo , John Stultz , Mike Frysinger , Minchan Kim , Hakan Akkan , Max Krasnyansky , Frederic Weisbecker , "Paul E. McKenney" , linux-kernel@vger.kernel.org, linux-mm@kvack.org, hughd@google.com, viresh.kumar@linaro.org, hpa@zytor.com, mingo@kernel.org, peterz@infradead.org On 08/05/2014 10:51 AM, Christoph Lameter wrote: > On Mon, 4 Aug 2014, Sasha Levin wrote: > >> On 07/25/2014 10:22 PM, Sasha Levin wrote: >>> On 07/10/2014 10:04 AM, Christoph Lameter wrote: >>>>> This patch creates a vmstat shepherd worker that monitors the >>>>> per cpu differentials on all processors. If there are differentials >>>>> on a processor then a vmstat worker local to the processors >>>>> with the differentials is created. That worker will then start >>>>> folding the diffs in regular intervals. Should the worker >>>>> find that there is no work to be done then it will make the shepherd >>>>> worker monitor the differentials again. >>> Hi Christoph, all, >>> >>> This patch doesn't interact well with my fuzzing setup. I'm seeing >>> the following: >> >> I think we got sidetracked here a bit, I've noticed that this issue >> is still happening in -next and discussions here died out. > > Ok I saw in another thread that this issue has gone away. Is there an > easy way to reproduce this on my system? > I don't see the VM_BUG_ON anymore, but the cpu warnings are still there. I can easily trigger it by cranking up the cpu hotplug code. Just try to frequently offline and online cpus, it should reproduce quickly. Thanks, Sasha -- 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