linux-kernel - Re: [PATCH 2/5] writeback: dirty position control

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Message-ID: <CAFdhcLTFv4Wk0kBb2NSL7oh+78BJ=6qPT4XfcOssOkwEERyj=w@mail.gmail.com>
Date:	Wed, 17 Aug 2011 02:40:19 -0400
From:	David Horner <ds2horner@...il.com>
To:	linux-kernel@...r.kernel.org, fengguang.wu@...el.com
Cc:	jack@...e.cz
Subject: Re: [PATCH 2/5] writeback: dirty position control

 I noticed a significant typo below (another of those thousand eyes,
thanks to Jan Kara's post that started ne looking) :

 > +static unsigned long bdi_position_ratio(struct backing_dev_info *bdi,
 > + unsigned long thresh,
...
 > + * For JBOD case, bdi_thresh (not bdi_dirty!) could fluctuate up to its
 > + * own size, so move the slope over accordingly.
 > + */
 > + if (unlikely(bdi_thresh > thresh))
 > + bdi_thresh = thresh;
 > + /*
 > + * scale global setpoint to bdi's:  setpoint *= bdi_thresh / thresh
 > + */
 > + x = div_u64((u64)bdi_thresh << 16, thresh | 1);

                  ^
 I believe should be

    x = div_u64((u64)bdi_thresh << 16, thresh + 1);

    David Horner
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