Re: [PATCH] writeback: prevent bandwidth calculation overflow

[Rik van Riel]

On 11/18/2010 01:57 AM, Wu Fengguang wrote:
> On 32bit kernel, bdi->write_bandwidth can express at most 4GB/s.
>
> However the current calculation code can overflow when disk bandwidth
> reaches 800MB/s.  Fix it by using "long long" and swapping the order of
> multiplication/division. And further, change its unit to pages/second
> rather than bytes/second. That allows up to 16TB/s bandwidth in 32bit
> kernel.
>
> Signed-off-by: Wu Fengguang<fengguang.wu@xxxxxxxxx>

Acked-by: Rik van Riel <riel@xxxxxxxxxx>

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