linux-kernel - Re: [PATCH 2/3] broadcast-tick: Move oneshot broadcast mask to per cpu variables

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Message-ID: <1314398922.3036.2.camel@edumazet-laptop>
Date:	Sat, 27 Aug 2011 00:48:42 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	tglx@...utronix.de, linux-kernel@...r.kernel.org,
	tim.c.chen@...ux.intel.com, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 2/3] broadcast-tick: Move oneshot broadcast mask to per
 cpu variables

Le vendredi 26 août 2011 à 15:32 -0700, Andi Kleen a écrit :
> From: Andi Kleen <ak@...ux.intel.com>
> 
> Avoid a global cache line hotspot in the oneshot cpu mask. Maintain
> this information in per cpu variables instead.
> 
> Signed-off-by: Andi Kleen <ak@...ux.intel.com>
> ---

>  
> -/* FIXME: use cpumask_var_t. */
> -static DECLARE_BITMAP(tick_broadcast_oneshot_mask, NR_CPUS);
> +struct broadcast_cpu_state {
> +	int need_oneshot;
> +} ____cacheline_aligned;
> +static DEFINE_PER_CPU(struct broadcast_cpu_state, state);

static DEFINE_PER_CPU_ALIGNED(...)

It avoids adding an alignment requirement on .data..percpu



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