Re: [PATCH] mm: don't allow fault_around_bytes to be 0

[David Rientjes]

On Mon, 28 Jul 2014, Andrey Ryabinin wrote:

> do_fault_around expects fault_around_bytes rounded down to nearest
> page order. Instead of calling rounddown_pow_of_two every time
> in fault_around_pages()/fault_around_mask() we could do round down
> when user changes fault_around_bytes via debugfs interface.
> 

If you're going to optimize this, it seems like fault_around_bytes would 
benefit from being __read_mostly.
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