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Re: thousands of kworker processes with 4.7.x and 4.8-rc*

From Mike Galbraith <umgwanakikbuti@gmail.com>
Newsgroups linux.kernel
Subject Re: thousands of kworker processes with 4.7.x and 4.8-rc*
Date 2016-09-25 20:30 +0200
Message-ID <slmlA-1C2-7@gated-at.bofh.it> (permalink)
References (2 earlier) <skzuy-4Kq-9@gated-at.bofh.it> <skBmF-69k-3@gated-at.bofh.it> <slh2x-6EB-3@gated-at.bofh.it> <slh2x-6EB-1@gated-at.bofh.it> <sllpv-10M-1@gated-at.bofh.it>
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On Sun, 2016-09-25 at 19:21 +0200, Mike Galbraith wrote:
> On Sun, 2016-09-25 at 21:40 +0900, Tomasz Chmielewski wrote:
> 
> > The problem is the allocator.
> > 
> > -CONFIG_SLUB=y
> > +CONFIG_SLAB=y
> > 
> > 
> > With SLUB, I'm getting a handful of kworker processes, as expected.
> > 
> > With SLAB, I'm getting thousands of kworker processes.
> > 
> > 
> > Not sure if that's expected behaviour or not.
> 
> I seriously doubt 1500+ kworkers piling up is expected.
> 
> 4.7.0-rc4       47
> 4.7.0-rc5       1592
> 
> Presuming you didn't switch to SLAB and/or change userspace all around
> while testing, that would still indicate a kernel regression lurking
> between rc4 and rc5.

Nevermind, seems config change was how you met the thing.

FWIW, I turned on SLAB with a distro config here, and see no such
behavior.  If I could reproduce, I'd take the busted config back to
older kernels.

	-Mike

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Thread

Re: thousands of kworker processes with 4.7.x and 4.8-rc* Tomasz Chmielewski <mangoo@wpkg.org> - 2016-09-23 15:30 +0200
  Re: thousands of kworker processes with 4.7.x and 4.8-rc* Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-09-23 16:20 +0200
    Re: thousands of kworker processes with 4.7.x and 4.8-rc* Tomasz Chmielewski <mangoo@wpkg.org> - 2016-09-23 18:20 +0200
      Re: thousands of kworker processes with 4.7.x and 4.8-rc* Tomasz Chmielewski <mangoo@wpkg.org> - 2016-09-25 14:50 +0200
        Re: thousands of kworker processes with 4.7.x and 4.8-rc* Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-09-25 19:30 +0200
          Re: thousands of kworker processes with 4.7.x and 4.8-rc* Mike Galbraith <umgwanakikbuti@gmail.com> - 2016-09-25 20:30 +0200
        Re: thousands of kworker processes with 4.7.x and 4.8-rc* Nikolay Borisov <n.borisov.lkml@gmail.com> - 2016-09-25 21:10 +0200
          Re: thousands of kworker processes with 4.7.x and 4.8-rc* Tomasz Chmielewski <mangoo@wpkg.org> - 2016-09-27 06:00 +0200

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