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Date: Tue, 9 Aug 2011 06:38:05 +0800
From: Wu Fengguang <fengguang.wu@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
        Andrew Morton <akpm@linux-foundation.org>, Jan Kara <jack@suse.cz>,
        Christoph Hellwig <hch@lst.de>, Dave Chinner <david@fromorbit.com>,
        Greg Thelen <gthelen@google.com>, Minchan Kim <minchan.kim@gmail.com>,
        Vivek Goyal <vgoyal@redhat.com>, Andrea Righi <arighi@develer.com>,
        linux-mm <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 4/5] writeback: per task dirty rate limit
Message-ID: <20110808223805.GA7176@localhost>
References: <20110806084447.388624428@intel.com>
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 <20110808142318.GC22080@localhost>
 <1312813612.10488.36.camel@twins>
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On Mon, Aug 08, 2011 at 10:26:52PM +0800, Peter Zijlstra wrote:
> 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);

Good to know these, thanks!