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From:   Justin Piszcz <jpiszcz@lucidpixels.com>
Date:   Thu, 16 May 2019 10:27:50 -0400
Message-ID: <CAO9zADw_PnZMyVJKek-GT96esPXdh007hnzenveawOAM3CvK9g@mail.gmail.com>
Subject: Re: 5.1 kernel: khugepaged stuck at 100%
To:     "Kirill A. Shutemov" <kirill@shutemov.name>
Cc:     LKML <linux-kernel@vger.kernel.org>
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On Thu, May 16, 2019 at 10:17 AM Justin Piszcz <jpiszcz@lucidpixels.com> wrote:
>
> On Thu, May 16, 2019 at 10:14 AM Justin Piszcz <jpiszcz@lucidpixels.com> wrote:
> >
> > On Tue, May 14, 2019 at 9:16 AM Kirill A. Shutemov <kirill@shutemov.name> wrote:
> >
> > > Could you check what khugepaged doing?
> > >
> > > cat /proc/$(pidof khugepaged)/stack
> >
> > It is doing it again, 10:12am - 2019-05-16
> >
> >   PID USER      PR  NI    VIRT    RES    SHR S  %CPU  %MEM     TIME+ COMMAND
> >    77 root      39  19       0      0      0 R 100.0   0.0  92:06.94 khugepaged
> >
> > Kernel: 5.1.2
> >
> > $ sudo cat /proc/$(pidof khugepaged)/stack
> > [<0>] 0xffffffffffffffff
> >

As a workaround/in the meantime--I will add the following to lilo/grub:
transparent_hugepage=never

Justin