linux-kernel - Re: [PATCH] Expose sysctls for enabling slab/file

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Message-ID: <20131119184200.GD29695@two.firstfloor.org>
Date:	Tue, 19 Nov 2013 19:42:00 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Michal Hocko <mhocko@...e.cz>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH] Expose sysctls for enabling slab/file_cache
 interleaving

On Tue, Nov 19, 2013 at 11:42:03AM +0100, Michal Hocko wrote:
> On Mon 18-11-13 16:50:22, Andi Kleen wrote:
> [...]
> > diff --git a/include/linux/cpuset.h b/include/linux/cpuset.h
> > index cc1b01c..10966f5 100644
> > --- a/include/linux/cpuset.h
> > +++ b/include/linux/cpuset.h
> > @@ -72,12 +72,14 @@ extern int cpuset_slab_spread_node(void);
> >  
> >  static inline int cpuset_do_page_mem_spread(void)
> >  {
> > -	return current->flags & PF_SPREAD_PAGE;
> > +	return (current->flags & PF_SPREAD_PAGE) ||
> > +		sysctl_spread_file_cache;
> >  }
> 
> But this might break applications that explicitly opt out from
> spreading.

What do you mean? There's no such setting at the moment.

They can only enable it.

-Andi
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