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Subject: Re: [PATCH 4/5] writeback: per task dirty rate limit
From: Peter Zijlstra <peterz@infradead.org>
To: Wu Fengguang <fengguang.wu@intel.com>
Cc: "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>, Jan Kara <jack@suse.cz>,
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        Vivek Goyal <vgoyal@redhat.com>, Andrea Righi <arighi@develer.com>,
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Date: Mon, 08 Aug 2011 16:26:52 +0200
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On Mon, 2011-08-08 at 22:23 +0800, Wu Fengguang wrote:
> +       preempt_disable();
> +       p = &__get_cpu_var(dirty_leaks);

 p = &get_cpu_var(dirty_leaks);

> +       if (*p > 0 && current->nr_dirtied < ratelimit) {
> +               nr_pages_dirtied = min(*p, ratelimit - current->nr_dirtied);
> +               *p -= nr_pages_dirtied;
> +               current->nr_dirtied += nr_pages_dirtied;
> +       }
> +       preempt_enable(); 

put_cpu_var(dirty_leads);