linux-kernel - Re: [PATCH 3/9] writeback: bdi write bandwidth estimation

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Date:	Fri, 8 Jul 2011 04:53:35 -0700
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Andrea Righi <righi.andrea@...il.com>
Cc:	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Jan Kara <jack@...e.cz>, Dave Chinner <david@...morbit.com>,
	Christoph Hellwig <hch@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Li, Shaohua" <shaohua.li@...el.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/9] writeback: bdi write bandwidth estimation

Andrea,

> Another small time nitpick.
> 
> > +
> > +static void bdi_update_bandwidth(struct backing_dev_info *bdi,
> > +				 unsigned long start_time)
> > +{
> > +	if (jiffies - bdi->bw_time_stamp <= MAX_PAUSE + MAX_PAUSE / 10)
> 
> 	if (time_is_after_eq_jiffies(bdi->bw_time_stamp + MAX_PAUSE +
> 						MAX_PAUSE / 10)

Done, and simplified to

        if (time_is_after_eq_jiffies(bdi->bw_time_stamp + BANDWIDTH_INTERVAL))
                return;

Thanks,
Fengguang
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