linux-kernel - Re: [Patch] Idle balancer: cache align nohz structure to improve idle load balancing scalability

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Message-ID: <m2wrc0xpbg.fsf@firstfloor.org>
Date:	Wed, 19 Oct 2011 21:24:51 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Tim Chen <tim.c.chen@...ux.intel.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Venki Pallipadi <venki@...gle.com>
Subject: Re: [Patch] Idle balancer: cache align nohz structure to improve idle load balancing scalability

Tim Chen <tim.c.chen@...ux.intel.com> writes:
>   */
>  static struct {
> -	atomic_t load_balancer;
> -	atomic_t first_pick_cpu;
> -	atomic_t second_pick_cpu;
> -	cpumask_var_t idle_cpus_mask;
> +	atomic_t load_balancer ____cacheline_aligned;
> +	atomic_t first_pick_cpu ____cacheline_aligned;
> +	atomic_t second_pick_cpu ____cacheline_aligned;
> +	cpumask_var_t idle_cpus_mask ____cacheline_aligned;

On large configs idle_cpu_masks may be allocated.  May need
more changes to tell the allocator to cache align/pad too?

-Andi

-- 
ak@...ux.intel.com -- Speaking for myself only
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