linux-kernel - Re: 5.1 kernel: khugepaged stuck at 100%

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Message-ID: <20190524114310.6h3tlslncepa6323@butterfly.localdomain>
Date:   Fri, 24 May 2019 13:43:10 +0200
From:   Oleksandr Natalenko <oleksandr@...hat.com>
To:     Justin Piszcz <jpiszcz@...idpixels.com>
Cc:     "Kirill A. Shutemov" <kirill@...temov.name>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: 5.1 kernel: khugepaged stuck at 100%

On Thu, May 16, 2019 at 10:27:50AM -0400, Justin Piszcz wrote:
> On Thu, May 16, 2019 at 10:17 AM Justin Piszcz <jpiszcz@...idpixels.com> wrote:
> >
> > On Thu, May 16, 2019 at 10:14 AM Justin Piszcz <jpiszcz@...idpixels.com> wrote:
> > >
> > > On Tue, May 14, 2019 at 9:16 AM Kirill A. Shutemov <kirill@...temov.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

Cc'ing myself since i observe such a behaviour sometimes right after KVM
VM is launched. No luck with reproducing it on demand so far, though.

-- 
  Best regards,
    Oleksandr Natalenko (post-factum)
    Senior Software Maintenance Engineer