linux-kernel - Re: [PATCH 4/5] mm: Only IPI CPUs to drain local pages if they exist

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Date:	Mon, 26 Sep 2011 09:28:34 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Gilad Ben-Yossef <gilad@...yossef.com>
Cc:	linux-kernel@...r.kernel.org,
	Frederic Weisbecker <fweisbec@...il.com>,
	Russell King <linux@....linux.org.uk>,
	Chris Metcalf <cmetcalf@...era.com>, linux-mm@...ck.org,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...nel.org>,
	Matt Mackall <mpm@...enic.com>
Subject: Re: [PATCH 4/5] mm: Only IPI CPUs to drain local pages if they exist

On Sun, 2011-09-25 at 11:54 +0300, Gilad Ben-Yossef wrote:
> +static inline void inc_pcp_count(int cpu, struct per_cpu_pages *pcp, int count)
> +{
> +       if (unlikely(!total_cpu_pcp_count))

	if (unlikely(!__this_cpu_read(total_cpu_pco_count))

> +               cpumask_set_cpu(cpu, cpus_with_pcp);
> +
> +       total_cpu_pcp_count += count;

	__this_cpu_add(total_cpu_pcp_count, count);

> +       pcp->count += count;
> +}
> +
> +static inline void dec_pcp_count(int cpu, struct per_cpu_pages *pcp, int count)
> +{
> +       pcp->count -= count;
> +       total_cpu_pcp_count -= count;

	__this_cpu_sub(total_cpu_pcp_count, count);

> +
> +       if (unlikely(!total_cpu_pcp_count))

	if (unlikely(!__this_cpu_read(total_cpu_pcp_count))

> +               cpumask_clear_cpu(cpu, cpus_with_pcp);
> +} 


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