linux-kernel - Re: [PATCH 2/8] Basic zcache functionality

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Message-ID: <4C42BAE5.9020606@cs.helsinki.fi>
Date:	Sun, 18 Jul 2010 11:27:17 +0300
From:	Pekka Enberg <penberg@...helsinki.fi>
To:	Nitin Gupta <ngupta@...are.org>
CC:	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg KH <greg@...ah.com>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	Rik van Riel <riel@...hat.com>, Avi Kivity <avi@...hat.com>,
	Christoph Hellwig <hch@...radead.org>,
	Minchan Kim <minchan.kim@...il.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	linux-mm <linux-mm@...ck.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/8] Basic zcache functionality

Nitin Gupta wrote:
> +static void zcache_add_stat(struct zcache_pool *zpool,
> +		enum zcache_pool_stats_index idx, s64 val)
> +{
> +	struct zcache_pool_stats_cpu *stats;
> +
> +	preempt_disable();
> +	stats = __this_cpu_ptr(zpool->stats);
> +	u64_stats_update_begin(&stats->syncp);
> +	stats->count[idx] += val;
> +	u64_stats_update_end(&stats->syncp);
> +	preempt_enable();
> +
> +}

You should probably use this_cpu_inc() here.
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