From: Rik van Riel <riel@redhat.com>
To: Joe Lawrence <joe.lawrence@stratus.com>, Mel Gorman <mgorman@suse.de>
Cc: linux-mm@kvack.org
Subject: Re: numa balancing stuck in task_work_run
Date: Thu, 24 Sep 2015 21:04:23 -0400 [thread overview]
Message-ID: <56049D97.6080106@redhat.com> (raw)
In-Reply-To: <560467B8.6000101@stratus.com>
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
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next prev parent reply other threads:[~2015-09-25 1:04 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <5604665D.3030504@stratus.com>
2015-09-24 21:14 ` numa balancing stuck in task_work_run Joe Lawrence
2015-09-25 1:04 ` Rik van Riel [this message]
2015-09-25 17:27 ` Joe Lawrence
2015-09-25 17:38 ` Rik van Riel
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