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

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Message-ID: <20131119104203.GB18872@dhcp22.suse.cz>
Date:	Tue, 19 Nov 2013 11:42:03 +0100
From:	Michal Hocko <mhocko@...e.cz>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	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 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.

>  
>  static inline int cpuset_do_slab_mem_spread(void)
>  {
> -	return current->flags & PF_SPREAD_SLAB;
> +	return (current->flags & PF_SPREAD_SLAB) || 
> +		sysctl_spread_slab;
>  }
>  
>  extern int current_cpuset_is_being_rebound(void);
[...]
-- 
Michal Hocko
SUSE Labs
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