linux-kernel - Re: [PATCH] memory_hotplug: cond_resched in __remove

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Message-Id: <20181031121550.2f0cbd10a948880e534beaf7@linux-foundation.org>
Date:   Wed, 31 Oct 2018 12:15:50 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Michal Hocko <mhocko@...nel.org>
Cc:     Dan Williams <dan.j.williams@...il.com>,
        Johannes Thumshirn <jthumshirn@...e.de>, <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>
Subject: Re: [PATCH] memory_hotplug: cond_resched in __remove_pages

On Wed, 31 Oct 2018 13:58:40 +0100 Michal Hocko <mhocko@...nel.org> wrote:

> From: Michal Hocko <mhocko@...e.com>
> 
> We have received a bug report that unbinding a large pmem (>1TB)
> can result in a soft lockup:
> 
> ...
>
> It has been reported on an older (4.12) kernel but the current upstream
> code doesn't cond_resched in the hot remove code at all and the given
> range to remove might be really large. Fix the issue by calling cond_resched
> once per memory section.
> 

Worthy of a cc:stable, I suggest?