linux-kernel - Re: [PATCH 4/5] writeback: per task dirty rate limit

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Date:	Mon, 08 Aug 2011 16:26:52 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Wu Fengguang <fengguang.wu@...el.com>
Cc:	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@....de>,
	Dave Chinner <david@...morbit.com>,
	Greg Thelen <gthelen@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Vivek Goyal <vgoyal@...hat.com>,
	Andrea Righi <arighi@...eler.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/5] writeback: per task dirty rate limit

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);
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